Cisco 2002115 MPE Rev 2 081102

FCC ID: LDK102045

RF Exposure Info

Download: PDF

FCCID_262615

TABLE OF CONTENT
1 GENERAL INFORMATION .................................................................................................................................................4
1.1 SCOPE OF TESTING...............................................................................................................................................4
1.2 RELATED SUBMITAL(S) / GRANTS.............................................................................................................................4
1.3 TESTS METHODOLOGY...........................................................................................................................................4
2 EQUIPMENT INFORMATION..............................................................................................................................................5
2.1 EQUIPMENT SPECIFICAT ION RELATED TO THE TESTS................................................................................................5
2.2 MODIFICATIONS.....................................................................................................................................................5
2.3 EXERSICING THE EUT.............................................................................................................................................5
2.4 A CHOICE OF CHANNELS FOR MPE MEASUREMENTS.................................................................................................6
2.5 JUSTIFIICATIONS....................................................................................................................................................6
2.5.1 JUSTIFICATION CONCER NING THE TESTED POSITIONS.........................................................................................6
2.5.2 JUSTIFICATION CONCER NING ANTENNAS OF THIS APPLICATION............................................................................7
3 TEST CONFIGURATION ....................................................................................................................................................7
3.1 TEST SETUP DIAGRAM............................................................................................................................................7
3.2 TEST SETUP PHOTOGRAPHS...................................................................................................................................9
3.3 TEST EQUIPMENT................................................................................................................................................ 11
4 MPE TEST DESCRIPTION AND LIMITS.............................................................................................................................. 11
4.1 MPE LIMITS AND AVERAGING TIME......................................................................................................................... 11
4.2 DESCRIPTION OF THE MPE TEST PERFORMED FOR THE EUT CONNECTED EITHER TO THE 2.2 DBI DIPOLE ANTENNA.... 13
4.3 JUSTIFICATION OF USE OF THE EMR 200 FOR THE MPE TEST PERFORMED WITH THE YAGI ANTENNA. ......................... 13
4.4 ENVIRONMENT CONDITIONS DURING MPE TESTS.................................................................................................... 14
5 MPE MEASUREMENT RESULTS....................................................................................................................................... 14
5.1 INVESTIGATION OF INFLUENCE THE POSITION OF THE NON-TRANSMITTING ANTENNA TO THE MPE RESULTS FOR THE
EUT CONNECTED TO THE 2.2 DBI DIPOLE ANTENNA.............................................................................................................. 14
5.2 MPE TEST RESULTS FOR THE DESKTOP POSITION OF THE EUT CONNECTED TO THE 2.2 DBI DIPOLE ANTENNA............ 14
5.2.1 2.2 DBI DIPOLE ANTENNA PATTERN FOR THE DESKTOP POSITION OF THE EUT...................................................... 14
5.2.2 DESKTOP POSITION. MPE FOR THE TRANSMITTING 2.2 DBI DIPOLE ANTENNA. INVESTIGATING OF CO-LOCATION OF
THE INTEGRAL ANTENNA............................................................................................................................................... 16
5.2.3 DESKTOP POSITION. INTEGRAL ANTENNA PATTERN........................................................................................... 18
5.2.4 DESKTOP POSITION. MPE VERSUS HEIGHT FOR THE INTEGRAL ANTENNA. INVESTIGATION OF CO-LOCATION OF THE
2.2 DBI DIPOLE ANTENNA. .............................................................................................................................................. 19
5.3 MPE TEST RESULTS FOR THE WALL-MOUNTED EU T CONNECTED TO 2.2 DBI DIPOLE ANTENNA.................................... 20
5.3.1 WALL-MOUNTED POSITION. 2.2 DBI DIPOLE ANTENNA PATTERN........................................................................... 20
5.3.2 WALL-MOUNTED EUT. IN VESTIGATION OF MPE FROM THE 2.2 DBI DIPOLE ANTENNA VERSUS HEIGHT. INVESTIGATION
OF CO-LOCATION.......................................................................................................................................................... 21
5.3.3 WALL-MOUNTED EUT. INTEGRAL ANTENNA PATTERN......................................................................................... 22
5.3.4 WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INVESTIGATION OF CO-LOCATION OF 2.2 DBI DIPOLE FOR THE
INTEGRAL ANTENNA...................................................................................................................................................... 23
5.4 INVESTIGATION OF THE EUT WITH THE YAGI ANTENNA............................................................................................ 24
5.4.1 YAGI ANTENNA PATTERN AND MPE VERSUS HEIGHT .......................................................................................... 24
5.4.2 INFLUENCE OF CO-LOCATION OF THE INTEGRAL ANTENNA................................................................................. 25
6 CONCLUSION ............................................................................................................................................................... 27

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

TABLE OF TABLES
TABLE 2.4.1: RESULTS OF EIRP MEASUREMENTS FOR THE 2.2 DBI DIPOLE ANTENNA..................................................................6
TABLE 2.4.2: RESULTS OF EIRP MEASUREMENTS FOR THE INTEGRAL ANTENNA........................................................................6
TABLE 2.4.3: RESULTS OF EIRP MEASUREMENTS FOR THE YAGI ANTENNA................................................................................6
TABLE 2.5.1: LIST OF THE ANTENNAS APPLICABLE FOR CON NECTION TO THE EUT. ...................................................................7
TABLE 3.3.1: TEST EQUIPMENT LIST..................................................................................................................................... 11
TABLE 4.1.1: LIMITS FOR MPE DATA FOR OCUPATIONAL / CONTROLLED EXPOSURE................................................................. 12
TABLE 4.1.2: LIMITS FOR MPE DATA FOR GENERAL POPULAT ION / UNCONTROLLED EXPOSURE................................................ 12
TABLE 5.2.1: DESKTOP POSITION. MPE DATA VERSUS AZIMUTH WITH THE 2.2 DBI DIPOLE ANTENNA TRANSMITTING................... 15
TABLE 5.2.2: DESKTOP POSITION. MPE VERSUS HEIGHT FOR THE TRANSMITTING 2.2 DBI DIPOLE ANTENNA V/H......................... 16
TABLE 5.2.3: DESKTOP POSITION. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOCATION TO RADIATING 2.2 DBI DIPOLE V....... 17
TABLE 5.2.4 DESKTOP POSITION. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOCATION TO RADIATING 2.2 DBI DIPOLE H. ...... 17
TABLE 5.2.5: DESKTOP POSITION OF THE EUT. MPE DATA VERSUS AZIMUTH WITH THE INTEGRAL ANTENNA TRANSMITTING........ 18
TABLE 5.2.6: DESKTOP POSITION. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOCATION OF THE 2.2 DBI DIPOLE TO THE
INTEGRAL V................................................................................................................................................................. 19
TABLE 5.2.7: DESKTOP POSITION. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOCATION OF THE 2.2 DBI DIPOLE TO THE
INTEGRAL H................................................................................................................................................................. 20
TABLE 5.3.1: WALL-MOUNTED EUT. MPE DATA VERSUS AZIMUTH WITH THE 2.2 DBI DIPOLE ANTENNA TRANSMITTING.................. 20
TABLE 5.3.2: WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOC ATION FOR 2.2 DBI DIPOLE V.................... 21
TABLE 5.3.3: WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOC ATION FOR 2.2 DBI DIPOLE H ................... 22
TABLE 5.3.4: WALL-MOUNTED EUT. MPE VERSUS AZIMUTH WITH THE INTEGRAL ANTEN NA TRANSMITTING................................. 22
TABLE 5.3.5: WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INVESTIGATION OF CO-LOCATION OF 2,2 DBI DIPOLE FOR THE
INTEGRAL V.................................................................................................................................................................. 23
TABLE 5.3.6: WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INVESTIGATION OF CO-LOCATION OF 2.2 DBI DIPOLE FOR THE
INTEGRAL H. ................................................................................................................................................................ 24
TABLE 5.4.1: RADIATION PATTERN FOR YAGI ANTENNA.......................................................................................................... 24
TABLE 5.4.2: MPE FROM THE YAGI ANTENNA VERSUS HEIGHT............................................................................................... 25
TABLE 5.4.3: INFLUENCE OF CO-LOCATION OF THE YAGI ANTENNA TO MPE RESULTS FROM THE INTEGRAL AN TENNA................ 26
TABLE 5.4.4: INFLUENCE OF CO-LOCATION OF THE INTEGRAL ANTENNA TO THE MPE RESULTS FROM THE YAGI ANTENNA.......... 26

TABLE OF FIGURES
FIGURE 3.1.1: TEST SETUP DIAGRAM F OR THE DESKTOP POSIT ION OF THE EUT WITH THE 2.2 DBI DIPOLE ANTENNA ...................................................... 8
FIGURE 3.1.2: TEST SETUP DIAGRAM F OR THE WALL-MOUNTED POSITION OF THE EUT WITH THE 2.2 DBI DIPOLE ANTENNA ................................................ 9
FIGURE 3.1.3: TEST SETUP DIAGRAM F OR THE DESKTOP POSIT ION OF THE EUT WITH THE YAGI ANTENNA ............................................................................... 9

TABLE OF PHOTOGRAPHS
PHOTOGRAPH 3.2.1: DESKTOP EUT WITH THE 2.2 DBI D IPOLE ANTENNAANTENNA, ANTENNAS ARE IN THE VERTICAL POSITIONS .................................... 10
PHOTOGRAPH 3.2.2: WALL-MOUNTED EUT WIT H THE 2.2 DBI DIPOLE ANTENNAS; ALL ANTEN NAS ARE IN THE HORIZ ONTAL POSITION............................ 10
PHOTOGRAPH 3.2.3: TEST SETUP WITH THE YAGI ANTENNA .................................................................................................................................................................... 11

3

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

1 GENERAL INFORMATION

1.1 SCOPE OF TESTING
During testing described in this test report Maximum Permissible Exposure (MPE)1 characteristics of the
Access Point transmitter model AP1200 were investigated. The tests were performed in accordance with
the requirements of OET Bulletin 65: “Evaluating compliance with FCC-Specified guidelines for Human
Exposure to Rad io Frequency Radiation”, Subpart I of Part 1 of the 47 CFR: “ Procedures Implementing the
National Environmental Policy Act of 1969”, Subpart J of Part 2 of the 47 CFR: “Equipment Authorization
Procedures”, 47 CFR paragraph 1.1310: “Radiofrequency radiation exposure limits”, 47 CFR paragraph
2.1091: “Radiofrequency radiation exposure evaluation: mobile and unlicensed devices” and Australia’s
Radiocommunication (Electromagnetic Radiation - Human Exposure Standard 1999), as well as AS/NZS
2772.1(Int.):1998—Radiofrequency fields Part 1: Maximum exposure levels - 3 kHz to 300 GHz.
Tests were performed by Rhein Tech Laboratories, Inc. (RTL), located at 360 Herndon Parkway, Suite
1400, Herndon, Virginia, 20170, USA. This facility is accepted by the National as well as International
Regulatory Agencies as the facility, where measurement can be performed on a contractual basis. MPE
measurements were conducted in the shielded semi-anechoic chamber with dimensions of 6 m by 4.2 m by
3 m (3 m- is the height of the chamber). The walls and the ceiling of this chamber are covered with the
absorbing material.

1.2 RELATED SUBMITAL(S) / GRANTS

The related submittal/grant for the Equipment Under Test (hereafter referred as the EUT) is FCC
application with FCC ID: LDK102045 currently at the Commission, and granted FCC application
LDK102042 respectively.

1.3 TESTS METHODOLOGY

All tests were performed in accordance with the FCC requirements presented in the documents
shown in sub-section 1.1 of this test report. Descriptions of the test setup, test performance and
test results are given in Section 3, Section 4 and Section 5 of this test report correspondingly.
The instrumentation utilized for the measurements was timely calibrated by the calibration
laboratories. This calibration was traceable to the National Institute of Standard and Technology
(NIST). Calibrations due dates are shown in the Test Equipment List in Section 3.
Environment conditions of the test area were controlled. Temperature and relative humidity of the
test area were measured with the Digital Hygro-Thermometer, SPER SCIENTIFIC, model 800041,
showing maximum and minimum values of these parameters during time of testing. Atmospheric
pressure was measured with the barometer manufactured by Infinity Instruments, model 2010B-
MS. Information about environmental conditions during the test is given in subsection 4.3.

1By definition, maximum permissible exposure (MPE) is rms and peak electric and magnetic field strength, or the plane-wave equivalent power
densities associated with these fields to which a person may be exposed without harmful effect and with an acceptable safety factor.

4

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

2 EQUIPMENT INFORMATION

2.1 EQUIPMENT SPECIFICATION RELATED TO THE TESTS

The EUT is a low power wireless transmitter / receiver, intended to be used in uncontrolled
environment. Two ports are available for connection to the 2.4 GHz antennas. These ports
(providing diversity transmitting and receiving) are intended for connection of antennas operating in
the frequency band of 2.412 GHz to 2.462 GHz. To these ports any of the applicable certified
antennas could be connected. The EUT was tested with two 2.2 dBi Dipole antennas model AIR-
ANT-4941 (one was a receiving antenna and another was a transmitting antenna) and then also
with the transmitting 13.5 dBi Yagi antenna model AIR-ANT-1949. The Integral antenna model
AIR-RM20A-A-K9 transmitting in the frequency band of 5.15 GHz to 5.35 GHz is solidly attached to
the EUT. The 2.2 dBi Dipole antennas are mounted directly to the EUT ports and they, as well as
the integral antenna have two positions with respect to the top surface of the EUT: horizontal and
vertical, referenced as H and V correspondingly in the report. The Yagi antenna is connected to
the EUT with a RF cable of at least 1 meter long; this antenna is intended for wall-mounted
installation.
When the EUT is connected to the Dipoles, it belongs to the mobile devices, with recommended
distance of 20 cm between the device and the body of nearby person. When the EUT is connected
to the Yagi antenna the last could be fixed-mounted indoor or outdoor. In the case when this
antenna is used outdoor a separation distance of 2 m between a user and this antenna could be
provided. But when the Yagi antenna is used indoor there is a possibility that the distance of 20
cm will be maintained between this antenna and the body of the nearby person. That’s why during
the MPE measurements of the EUT with the Yagi antenna the worst case for the user was
investigated – when the distance of 20 cm between the possible user and the Yagi antenna was
maintained.
Any of two antennas intended for transmission in the different frequency range could transmit
separately as well as simultaneously. Based on the manufacturer specification shown in Cisco
Aironet 1200 Series Access Point Hardware Installation Guide, the EUT could be installed by a
user in any of the following positions: in a desktop position, in a wall-mounted position and in a
ceiling-mounted position. All applicable options for the antennas and the EUT were investigated
during the MPE measurements.

2.2 MODIFICATIONS

No modifications were made during testing of the EUT.

2.3 EXERSICING THE EUT

The EUT was supplied with the software used to set either one of the WLAN or U-NII radio or the
two radios in continuous transmitting mode at any one of the chosen channel or at two channels
(one – from the low frequency band and another – in from the high frequency band). This gave
possibility to set the EUT at any regime required for investigation.

5

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

2.4 A CHOICE OF CHANNELS FOR MPE MEASUREMENTS

To eliminate a set of MPE measurements, a choice of the channels for the MPE investigations was
based on the investigations of EIRP 2. EIRP test results either from the FCC test reports referenced
to in section 1.2 or as the results of the new investigation (for the 2.2 dBi Dipole) showed the
channels with the highest transmitting power for the investigated antennas, which were chosen for
the MPE investigations. The EIRP results, having the accuracy of ± 0.5 dB for the 2.2 dBi Dipole
antenna and the Integral antenna and ± 1.5 dB for the Yagi antenna, are shown in Table 2.4.1
through Table 2.4.3 of this test report. They demonstrate that the highest level of EIRP is
transmitted by channel 11 when the 2.2 dBi Dipole antenna is used, by channel 6 when the 13.5
dBi Yagi antenna is used; channels 36 and 52 in the high frequency band where Integral antenna
radiates have approximately the same level of EIRP. For the MPE measurements channels 11, 6
and 52 were chosen for the 2.2 dBi Dipole antenna, Yagi antenna and the Integral antenna
correspondingly. It shall be noted that the Integral antenna consists of two dipole antennas and two
patch antennas. Therefore there are two columns with the EIRP in the Table 2.4.2.
TABLE 2.4.1: RESULTS OF EIRP MEASUREMENTS FOR THE 2.2 DBI DIPOLE ANTENNA

Channel number Frequency, GHz EIRP, dBm
1 2.412 15.0
6 2.437 20.3
11 2.462 20.5

TABLE 2.4.2: RESULTS OF EIRP MEASUREMENTS FOR THE INTEGRAL ANTENNA

EIRP for the dipole EIRP for the patch
Channel number Frequency, GHz antenna of the Integral antenna of the Integral
antenna, dBm antenna, dBm
36 5.15 19.6 18.7
52 5.25 19.5 18.7
64 5.35 19.0 18.2

TABLE 2.4.3: RESULTS OF EIRP MEASUREMENTS FOR THE YAGI ANTENNA

Channel number Frequency, GHz EIRP, dBm
1 2.412 27.5
6 2.437 30.1
11 2.462 29.0

2.5 JUSTIFIICATIONS

2.5.1 JUSTIFICATION CONCERNING THE TESTED POSITIONS
The EUT was tested in two positions: in a desktop position and in a wall-mounted position.
Investigation of the ceiling mounded position was not performed, as the final MPE measurements
were conducted with respect to the height from the EUT, and the MPE test data above the EUT set

2 EIRP is a term for expression of the performance of an antenna in a given direction relative to the performance of a theoretical (isotropic) antenna.

6

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

Exposure Criteria for Radiofrequency Electromagnetic Fields”. Based on these recommendations
MPE limits depend on the investigated frequency range and on intended use of the tested device,
such as occupational / controlled environment or general population / uncontrolled environment.
The environment of intended use influences also the measurement averaging time. MPE limits
and averaging time for occupational MPE and for general population MPE are shown in Table 4.1.1
and Table 4.1.2 correspondingly.
TABLE 4.1.1: LIMITS FOR MPE DATA FOR OCUPATIONAL / CONTROLLED EXPOSURE

Frequency Range, MHz Electric Field Strength Magnetic Field Strength Power Density (S)5, Averaging Time for
(E), V/m (H), A/m mW/cm 2  E
 2,  H  2 or S, min
0.3-3.0 614 1.63 (100) 6
3.0-30 1842/f 4.89/f (900/f2) 6
30-300 61.4 0.163 1.0 6
300-1500 - - f/300 6
1500-100,000 - - 5 6

TABLE 4.1.2: LIMITS FOR MPE DATA FOR GENERAL POPULATION / UNCONTROLLED EXPOSURE

Frequency Range, MHz Electric Field Strength Magnetic Field Strength Power Density (S), Averaging Time for
(E), V/m (H), A/m mW/cm 2  E
 2,  H  2 or S, min
0.3-3.0 614 1.63 (100) 30
3.0-30 824/f 2.19/f (180/f2) 30
30-300 27.5 0.073 0.2 30
300-1500 - - f/1500 30
1500-100,000 - - 1.0 30

But 47 CFR part 2.1091 of the FCC Rules and Regulations states that “time-averaging provisions
may not be used in determining typical exposure levels for devices intended for use by consumers
in general population / uncontrolled environments. However, “source-base” time-averaging based
on an inherent property or duty-cycle of a device is allowed. An example of this is the
determination of exposure from a device that uses digital technology such as a time-division
multiple-access scheme for transmitting of a signal. In general, maximum average power levels
must be used to determine compliance”. Relative to the EUT this statement requires that MPE
measurements were conducted as the peak (max) measurements.
As it is written in Section 2, the EUT belongs to the mobile devices used by general population.
Based on the transmitted frequencies, applicable limit for power density shall be 1.0 mW/cm2,
which is equivalent to the electric strength limit of 61.4 V/m in the far-field region, where the
equation (4.1.1) is applicable:

S = E2 / (377*10), (4.1.1)

In (4.1.1) S is the power density in mW/cm2, E is the electric filed strength in V/m and 377 is the
impedance of free space, measured in ohms. The FCC accepts the distance of 20cm6 as the

5 The values for power density in the near field of a transmitting antenna in the frequency range of 0.3 MHz to 30 MHz are given for reference
purposes. They were calculated as if the region was the far field region

6Differentiation between mobile and portable devices is based on 20-cm distance: For “mobile” devices this is the distance, that is maintained
between the body of a user or nearby person and the radiating structure. “Portable” devices can be used such that any part of radiating structure

12

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

minimum separation distance where reliable field measurements to determine adherence to MPE
limits can be made.

4.2 DESCRIPTION OF THE M PE TEST PERFORMED FOR THE EUT CONNECTED EITHER TO THE 2.2 DBI DIPOLE
ANTENNA

The radiating power meter EMR 200 used at RTL for the MPE measurements measures the field
strength and gives the reading either as the field strength or as the power density. Conversion of
the measured field strength into the power density is based on the far-field approximation. For the
frequencies transmitted by the EUT connected to Dipole antenna the 20-cm distance from the EUT
is the far-field distance. Therefore measurements of MPE could be made and were made as
power density measurements.

For each position of the EUT (desktop or wall-mounted) and for each position of its antennas the
test was conducted as the three-part test performed in the following sequence:
§ First of all preliminary investigation was conducted, such as MPE measurements at the
fixed 20 cm distance between the probe and the reference / zero point7 of the investigated
antenna versus azimuth. As the results of the measurements the angle corresponding to
the highest directivity of the antenna was established; and this position of the EUT was
chosen as the basic position for the second and third parts of the measurements.
§ In the second part of investigation the MPE measurements were conducted versus height.
The basic position for these measurements for the EUT and the probe was established
during preliminary measurements (see above). The MPE test data were taken above and
below the reference / zero point of the transmitting antenna in the vertical plane having
distance from the reference point of 20 cm and the height of 2 meters. Measurements
were taken at every 10 cm along this height.
§ In the third part of the test investigation of influence of co-location of the Integral antenna
was made. The EUT and the probe were set in the same reference position as in the
second part of the test. Both antennas were set to transmit simultaneously. MPE
measurements were made versus height at a few points below and above the zero point.
These test data were compared with the data received in the second part of the test to
make a conclusion about influence of co-location.

4.3 JUSTIFICATION OF USE THE EMR 200 FOR THE MPE TEST PERFORMED W ITH THE YAGI ANTENNA.

The highest dimension of the Yagi antenna radiating at 2.4 GHz, is 44.5 cm, therefore the FCC
“safe” distance of 20 cm is the near-field region for this antenna8. In the near-field region the
equation (4.1.1) is not applicable, as the connection between the power density and the electric

could be in direct contact with the body of the user or within 20 cm of the body of the user. For portable devices MPE measurements are not
applicable.

7 The reference point for the 2.2 dBi Dipole antenna was its bending point, the reference point for the integral antenna was the middle point of its
bending line.
8 To find a boundary Rff between the near-field and the far-field an equation Rff = 2 x L2/λ, was used, where L is the longest dimension of the
physical antenna and λ is the wavelength

13

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

field strength is more complicated. At the same time, the FCC gives the MPE limits only as the
power density limits for the frequencies above 300 MHz. To use the EMR-200 for power density
measurements in the near-field region, which is required for the Yagi antenna, we considered the
following: there are substantial scientific evidence that power density in the near-field region has
lower value than a power density derived from equation (4.1.1). That means that MPE power
density data received with the EMR-200 in the near-field region are higher than real power density
values in this region. Based on this consideration the following justification was made:
If the MPE data for any antenna measured with the EMR 200 in the near-field region and
presented in power density units have enough margins below the FCC MPE limits, the actual MPE
data would have higher margins, and therefore complies with the FCC limits.

The same three-part test as described above in subsection 4.2 was conducted for the EUT
connected to this antenna.

4.4 ENVIRONMENT CONDITIONS DURING MPE TESTS

Ambient conditions during MPE testing were as the following: temperature varied from 25 to 27 0C,
relative humidity from 30 to 40 %, and atmospheric pressure from 90 kPa to 100 kPa. These
conditions were in line with environmental conditions specified by the manufacturer.

5 MPE MEASUREMENT RESULTS

5.1 INVESTIGATION OF INFLUENCE THE POSITION OF THE NON-TRANSMITTING ANTENNA TO THE MPE RESULTS
FOR THE EUT CONNECTED TO THE 2.2 DBI DIPOLE ANTENNA

Investigation of influence the position of the non-transmitting antenna to the MPE created by the
transmitting antenna was made in the beginning of the tests. This investigation showed that
position of a non-transmitting antenna could influence the MPE produced by a transmitting
antenna, but this influence was within the limits of error of measurements equal to ± 10%.
Nevertheless in the most of the test results described in this test report we showed position of a
non-transmitting antenna.

5.2 MPE TEST RESULTS FOR THE DESKTOP POSITION OF THE EUT CONNECTED TO THE 2.2 DBI DIPOLE ANTENNA

5.2.1 2.2 DBI DIPOLE ANTENNA PATTERN FOR THE D ESKTOP POSITION OF THE EUT
Directivity of 2.2 dBi Dipole antenna radiation was investigated for both positions of the 2.2 dBi
Dipole antenna with the Integral antenna in the horizontal position. In these measurements zero
angle between the 2.2 dBi Dipole antenna and the probe corresponded to the position of the probe
in front of the EUT and directly in front of the transmitting antenna. During the rotation of the test
desk from 00 to 1800 (this was the so-called “positive” angle rotation) the EUT with the respect to
the probe was moved such that at the few first set of angles the receiving antenna “moved” to the
probe and then was moved from the probe. During the “negative” angle rotation (from 00 to – 1700)
the receiving antenna first moved from the probe. The test results are shown in Table 5.2.1.1. The

14

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

main part of these measurements was conducted at the distance of 20 cm between the probe and
the reference point of the 2.2 dBi Dipole antenna. But it was impossible to keep this distance for
the angle range of 1200 to 2000, when the probe was directed to the back part of the EUT. This
impossibility was connected with the use of the wood fixture having thickness of 1 cm, and
proximity of the EUT, providing distance up to 23 cm between the reference point and certain
points of the back of the EUT. Therefore for the angles between the probe and the 2.2 dBi Dipole
antenna in the range of 1200 to 2000 a real distance between the probe and the antenna was
different. It is shown in the column for the notes in the Table 5.2.1.
TABLE 5.2.1: DESKTOP POSITION. MPE DATA VERSUS AZIMUTH WITH THE 2.2 DBI DIPOLE ANTENNA TRANSMITTING

MPE, mW/cm 2
2.2 dBi Dipole
Angle, 2.2 dBi Dipole
antenna V
degree antenna H transmits,
transmits, Notes
Integral H does not
Integral H does
transmit
not transmit
A probe was 1 cm from the wooden fixture, the distance between the probe and
180 0.0180 0.0115
the reference point was 24 cm
A probe was 0.5 cm from the wooden fixture, the distance between the probe
170 0.0193 0.0160
and the reference point was 24 cm
A probe was 1 cm from the wooden fixture, the distance between the probe and
160 0.0199 0.0162
the reference point was 24 cm
A probe was 0.8 cm from the wooden fixture, the distance between the probe
150 0.0082 0.0153
and the reference point was 25.5 cm
140 0.0188 0.0048 The distance between the probe and the reference point is 25 cm
130 0.0137 0.0031 The distance between the probe and the reference point is 23 cm
120 0.0130 0.0014 The distance between the probe and the reference point is 21 cm
110 0.0118 0.0018
100 0.0129 0.0030
90 0.0110 0.0039
80 0.0089 0.0073
70 0.0110 0.0082
60 0.0132 0.0091
50 0.0161 0.0099
40 0.0171 0.0096
30 0.0128 0.0051
20 0.0111 0.0070
10 0.0091 0.0042
0 (360) 0.0117 0.0025
350 (-10) 0.0105 0.0024
340 (-20) 0.0119 0.0021
330 (-30) 0.0131 0.0039
320 (-40) 0.0122 0.0082
310 (-50) 0.0118 0.0080
300 (-60) 0.0119 0.0131
290 (-70) 0.0119 0.0141
280 (-80) 0.0119 0.0122
270 (-90) 0.0099 0.0128
260 (-100) 0.0148 0.0082
250 (-110) 0.0150 0.0048
240 (-120) 0.0144 0.0032
230 (-130) 0.0135 0.0033
220 (-140) 0.0156 0.0035
210 (-150) 0.0177 0.0048
The distance between the probe and the reference point is 20 cm, but the probe
200 (-160) 0.0235 0.0212
almost touches the fixture

15

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

The test results described in this subsection show that the values of the MPE from the 2.2 dBi
Dipole antenna are significantly below the FCC limits, and that influence of co-location of the
integral antenna is non-significant, it is in the range of the experiment accuracy, which was ± 10%.

5.2.3 DESKTOP POSITION. I NTEGRAL ANTENNA PATTERN.
Directivity of Integral antenna radiation was investigated for both positions of this antenna with the
2.2 dBi Dipole antenna horizontal. In these measurements zero angle between the Integral
antenna and the probe corresponded to the position of the probe in front of the EUT, such that the
Dipole antennas were closer to the probe than the integral antenna. The middle point of the
bending line of the integral antenna was chosen as the zero / reference point. Rotation of the test
desk was made in the same way as it was described in subsection 5.2.1. The test results are
shown in Table 5.2.5. At certain positions of the EUT some parts of the integral antenna were
closer to the probe than the reference point of the antenna for this test. A column with the Notes
shows some of these distances.
TABLE 5.2.5: DESKTOP POSITION OF THE EUT. MPE DATA VERSUS AZIMUTH WITH THE INTEGRAL ANTENNA TRANSMITTING

MPE, mW/cm 2
Angle, Integral V transmits, Integral H transmits,
degree 2.2 dBi Dipole H does not 2.2 dBi Dipole H does not Notes
transmit transmit
180 0.0006 0.0005 The probe is directed to the back of the EUT
170 0.0007 0.0005
160 0.0007 0.0005
150 0.0006 0.0007
140 0.0007 0.0005
130 0.0008 0.0004
120 0.0008 0.0003
110 0.0009 0.0004
100 0.0007 0.0005
90 0.0008 0.0006
80 0.0007 0.0006
70 0.0006 0.0006
60 0.0005 0.0007
50 0.0003 0.0007
40 0.0008 0.0015
30 0.0014 0.0021
20 0.0016 0.0028
10 0.0017 0.0024
0 (360) 0.0010 0.0019 The probe is 8.5 cm from the top edge of the Integral H
350 (-10) 0.0011 0.0015 The probe is 9.5 cm from the top edge of the Integral H
340 (-20) 0.0009 0.0014
330 (-30) 0.0005 0.0009
320 (-40) 0.0003 0.0004
310 (-50) 0.0003 0.0004 The probe is 10.5 cm from the top edge of the Integral
H
300 (-60) 0.0002 0.0003
290 (-70) 0.0002 0.0003 The probe is 16 cm from the side edge of Integral V
280 (-80) 0.0002 0.0006 The probe is 14.5 cm from the side edge of Integral V
270 (-90) 0.0002 0.0009
260 (-100) 0.0002 0.0007
250 (-110) 0.0004 0.0007

18

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

MPE, mW/cm 2
Angle, Integral V transmits, Integral H transmits,
degree 2.2 dBi Dipole H does not 2.2 dBi Dipole H does not Notes
transmit transmit
240 (-120) 0.0005 0.0006
230 (-130) 0.0005 0.0004
220 (-140) 0.0007 0.0004
210 (-150) 0.010 0.0006
200 (-160) 0.0011 0.0007
190 (-170) 0.0008 0.0009

5.2.4 DESKTOP POSITION. MPE VERSUS HEIGHT FOR THE INTEGRAL ANTENNA. INVESTIGATION OF CO-LOCATION
OF THE 2.2 DBI DIPOL E ANTENNA.
Based on the results described in subsection 5.2.3, investigations of MPE versus height for the
Integral antenna in vertical and horizontal positions were made at +100 azimuth between the EUT
and the probe. Influence of co-location of the 2.2 dBi Dipole antenna was investigated for a few
heights from the EUT10. The test results for the Integral V and Integral H are shown in Table 5.2.6
and Table 5.2.7correspondingly.
TABLE 5.2.6: DESKTOP POSITION. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOCATION OF THE 2.2 DBI DIPOLE TO THE INT EGRAL V

MPE, mW/cm 2
Height, Integral V transmits. Both 2.2 dBi Dipole 2.2 dBi Dipole V 2.2 dBi Dipole H
cm Both 2.2 dBi Dipole V
2.2 dBi Dipole H does H + Integral V transmits, Integral V transmits, Integral V
+ Integral V transmit
not transmit. transmit does not transmit does not transmit
80 0.0002
70 0.0002
60 0.0003
50 0.0004
40 0.0003
30 0.0005
20 0.0006
10 0.0006 0.0342 0.0268 0.0262 0.0344
0 0.0017 0.0743 0.0765 0.0742 0.0699
-10 0.0009 0.0338 0.0215 0.0205 0.0339
-20 0.0003
-30 0.0002
-40 0.0002
-50 0.0002
-60 0.0002
-70 0.0002
-80* 0.0003

Higher MPE levels from the 2.2 dBi Dipole antenna with respect to the data received in subsection
5.2.2 were connected with the closeness of the 2.2 dBi Dipole antenna to the probe: for example,
at “zero” level the probe was 9 cm from the transmitting dipole.

10It shall be pointed out that to make measurements versus height the EUT was moved front with the respect to the position it had when the
antenna pattern was investigated, otherwise it was impossible to take measurements below “”zero” level: the probe touched the wood of the stand.

19

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

TABLE 5.2.7: DESKTOP POSITION. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOCATION OF THE 2.2 DBI DIPOLE TO THE INTEGRAL H

MPE, mW/cm 2
Height, Integral H transmits. Both 2.2 dBi Dipole 2.2 dBi Dipole V 2.2 dBi Dipole H
cm Both 2.2 dBi Dipole V
2.2 dBi Dipole H does H + Integral H transmits, Integral H transmits, Integral H
+ Integral H transmit
not transmit. transmit does not transmit does not transmit
80 0.0004
70 0.0003
60 0.0005
50 0.0008
40 0.0009
30 0.0010
20 0.0012
10 0.0025 0.0376 0.0356 0.0353 0.0353
0 0.0029 0.0733 0.0855 0.099 0.0698
-10 0.0007 0.0356 0.0220 0.0224 0.0382
-20 0.0002
-30 0.0002
-40 0.0002
-50 0.0002
-60 0.0002
-70 0.0002
-80* 0.0001

The test results show that the 2.2 dBi Dipole antenna influences significantly the MPE values from
the Integral antenna. But it shall be noted though that based on the data it is difficult to say that a
summary of MPE from the 2.2 dBi Dipole antenna and the Integral antenna is really higher than
MPE from a 2.2 dBi Dipole, as the data describing co-location are within the accuracy of the
experiment.

5.3 MPE TEST RESULTS FOR THE WALL-MOUNTED EUT CONNECTED TO 2.2 D BI DIPOLE ANTENNA.

5.3.1 WALL-MOUNTED POSITION. 2.2 DBI DIPOLE AN TENNA PATTERN
Directivity of 2.2 dBi Dipole antenna radiation was investigated for horizontal and vertical positions
of the 2.2 dBi Dipole antenna with the Integral antenna in the horizontal position. The test results
are shown in Table 5.3.1.

TABLE 5.3.1: WALL-MOUNTED EUT. MPE DATA VERSUS AZIMUTH WITH THE 2.2 DBI DIPOLE ANTENNA TRANSMITTING

Measured power, mW/cm 2
Angle, degree 2.2 dBi Dipole V transmits. Integral H does not 2.2 dBi Dipole H transmits. Integral H does not transmit.
transmit
90 0.0079 0.0040
80 0.0078 0.0059
70 0.0082 0.0083
60 0.0085 0.0156
50 0.0092 0.0178
40 0.0133 0.0153
30 0.0125 0.0156
20 0.0084 0.0159

20

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

Measured power, mW/cm 2
Angle, degree 2.2 dBi Dipole V transmits. Integral H does not 2.2 dBi Dipole H transmits. Integral H does not transmit.
transmit
10 0.0056 0.0135
0 0.0042 0.0128
-10 0.0044 0.0129
-20 0.0052 0.0102
-30 0.0073 0.0099
-40 0.0124 0.0098
-50 0.0143 0.0109
-60 0.0153 0.0112
-70 0.0198 0.0126
-80 0.0153 0.0124
-90 0.0124 0.0083

5.3.2 WALL-MOUNTED EUT. INVESTIGATION OF MPE F ROM THE 2.2 DBI DIPOLE ANTENNA VERSUS HEIGHT.
INVESTIGATION OF CO-LOCATION
Investigation of power density transmitted by the 2.2 dBi Dipole antenna V and 2.2 dBi Dipole
antenna H versus height, as well as influence of co-location of the Integral antenna were made at
the angle equal to -700 between the 2.2 dBi Dipole antenna H and a test probe and at the angle
equal to 500 for the 2.2 dBi Dipole antenna H. These angles were chosen based on the test results
described in subsection 5.3.1. Reference point (0 cm height) established for this test was
described in subsection 4.2. The test results are shown in Table 5.3.2 and Table 5.3.3
TABLE 5.3.2: WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOCATION FOR 2.2 DBI DIPOLE V

MPE, mW/cm 2
Height, 2.2 dBi Dipole V 2.2 dBi Dipole V Both 2.2 dBi Dipole Both 2.2 dBi Dipole Only
cm Only Integral
radiates, Integral H transmits, Integral V V and Integral V V and Integral H Integral V
H radiates
does not radiate does not radiate transmit transmit radiates
100 0.0005
90 0.0009
80 0.0012
70 0.0024
60 0.0039
50 0.0049
40 0.0059
30 0.0068 0.0059 0.0066 0.0072 0.0007 0.0003
20 0.0095 0.0098 0.0112 0.0102 0.0012 0.0003
10 0.0150 0.0131 0.0138 0.0150 0.0011 0.0003
0 0.0167 0.0137 0.0139 0.0168 0.0007 0.0002
-10 0.0129 0.0125 0.0124 0.0125 0.0002 0.0004
-20 0.0090 0.0093- 0.0099 0.0079 0.0002 0.0002
-30 0.0069 0.0061- 0.0068 0.0064 0.0002 0.0003
-40 0.0055
-50 0.0042
-60 0.0031
-70 0.0019
-80 0.0015
-90 Could not make measurements at this and lower height, as 5 cm below –80 cm there was a surface of the wooden desk.

Comparison of the test data when only the 2.2 dBi Dipole antenna V transmits with the data when
both the 2.2 dBi Dipole antenna V and the Integral antennas transmit does not show any influence

21

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

of co-location of the integral antenna, as the differences in the data are in the limits of ±10% error
of the experiment
TABLE 5.3.3: WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INFLUENCE OF CO-LOCATION FOR 2.2 DBI DIPOLE H

Measured power, mW/cm 2
Height, 2.2 dBi Dipole H, 2.2 dBi Dipole H, Both 2.2 dBi Dipole Only
cm Both 2.2 dBi Dipole Only Integral
Integral H does not Integral V does not H + Integral H Integral V
H + Integral V radiate H radiates
radiate radiate radiate radiates
100 0.0003
90 0.0004
80 0.0005
70 0.0007
60 0.0009
50 0.0018
40 0.0011
30 0.0006 0.0006 0.0008 0.0027 0.0005 0.0021
20 0.0015 0.0016 0.0028 0.0040 0.0009 0.0025
10 0.0040 0.0037 0.0036 0.0065 0.0004 0.0035
0 0.0144 0.0142 0.0144 0.0165 0.0004 0.0024
-10 0.0180 0.0184 0.0185 0.0201 0.0005 0.0020
-20 0.0096 0.0092 0.0098 0.00106 0.0004 0.0012
-30 0.0046
-40 0.0018
-50 0.0010
-60 0.0005
-70 0.0003
-80 0.0003

Results of the measurements presented in Table 5.3.3 show that co-location of the Integral
antenna slightly increases the MPE values from the 2.2 dBi Dipole antenna H when the Integral
antenna is in the horizontal position. When the Integral antenna is in the vertical position there is
no influence of co-location, as the differences in the data are in the limits of the +/- 10% error of the
experiment.

5.3.3 WALL-MOUNTED EUT. I NTEGRAL ANTENNA PATTERN
Directivity of Integral antenna radiation was investigated for both positions of the Integral antenna
with the 2.2 dBi Dipole antenna in the horizontal position. The test results are shown in Table
5.3.4.
TABLE 5.3.4: WALL-MOUNTED EUT. MPE VERSUS AZIMUTH WITH THE INTEGRAL ANT ENNA TRANSMITTING 11

Measured power, mW/cm 2
Angle, degree
Integral H transmits* Integral V transmits*
90 0.0016 0.0008
80 0.0013 0.0006
70 0.0019 0.0005
60 0.0019 0.0003
50 0.0015 0.0002
40 0.0011 0.0002
30 0.0004 0.0002
20 0.0006 0.0005

11 See footnote 4

22

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

Measured power, mW/cm 2
Angle, degree
Integral H transmits* Integral V transmits*
10 0.0008 0.0002
0 0.0013 0.0005
-10 0.0012 0.0004
-20 0.0007 0.0005
-30 0.0010 0.0006
-40 0.0012 0.0004
-50 0.0019 0.0003
-60 0.0028 0.0002
-70 0.0036 0.0002
-80 0.0028 0.0003
-90 0.0024 0.0002

5.3.4 WALL-MOUNTED EUT. M PE VERSUS HEIGHT AND INVESTIGATION OF CO-LOCATION OF 2.2 DBI DIPOLE FOR
THE INTEGRAL ANTENNA.
Investigations of the power transmitted by the Integral antenna versus height, as well as influence
of co-location of the 2.2 dBi Dipole antenna were made at the angle equal to +900 between the
Integral antenna V and a test probe and at the angle equal to -700 for the Integral H. These angles
were chosen based on the test results described in subsection 5.3.3. Reference point (0 cm
height) this test was described in subsection 4.2. The test results are shown in Table 5.3.5 and
Table 5.3.6. As it is seen from the results, co-location of the 2.2 dBi Dipole antenna increases the
MPE values from the Integral antenna, but MPE remains significantly below the limits.
TABLE 5.3.5: WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INVESTIGATION OF CO -LOCATION OF 2,2 DBI DIPOLE FOR THE INTEGRAL V.12

Measured power, mW/cm 2
Height, Integral V
Integral V transmits, Both Integral V and Both Integral V and Only 2.2 dBi Only 2.2 dBi
cm transmits,
2.2 dBi Dipole V 2.2 dBi Dipole H 2.2 dBi Dipole V Dipole V Dipole H
2.2 dBi Dipole H
does not radiate transmit transmit transmits transmits
does not transmit
100 0.0001
90 0.0002
80 0.0002
70 0.0002
60 0.0003
50 0.0005
40 0.0009
30 0.0006
20 0.0008 0.0008 0.0035 0.0032 0.0026 0.0021
10 0.0008 0.0008 0.0026 0.0071 0.0059 0.0022
0 0.0008 0.0008 0.0013 0.0120 0.0090 0.0009
-10 0.0007 0.0006 0.0019 0.0091 0.0076 0.0014
-20 0.0004 0.0004 0.0019 0.0050 0.0045 0.0016
-30 0.0003 0.0003 0.0015 0.0052 0.0049 0.0015
-40 0.0002
-50 0.0002
-60 0.0002
-70 0.0002
-80 0.0002
-90 0.0002
-100 0.0002

12 See footnote 4

23

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

TABLE 5.3.6: WALL-MOUNTED EUT. MPE VERSUS HEIGHT AND INVESTIGATION OF CO-LOCATION OF 2.2 DBI DIPOLE FOR THE INTEGRAL H.

Measured power, mW/cm 2
Height, Integral H radiates, Integral H radiates, Both Integral H and Both integral H and Only 2.2 dBi Only 2.2 dBi
cm 2.2 dBi Dipole H 2.2 dBi Dipole V 2.2 dBi Dipole H 2.2 dBi Dipole V Dipole V Dipole H
does not radiate does not radiate transmit transmit transmits transmits
100 0.0001
90 0.0002
80 0.0002
70 0.0002
60 0.0003
50 0.0004
40 0.0009
30 0.0011 0.0013 0.0056 0.0058 0.0050 0.0040
20 0.0013 0.0015 0.0062 0.0079 0.0059 0.0049
10 0.0009 0.0010 0.0055 0.0073 0.0045 0.0033
0 0.0027 0.0029 0.0050 0.0089 0.0073 0.0025
-10 0.0029 0.0026 0.0061 0.0185 0.0159 0.0033
-20 0.0011 0.0013 0.0129 0.0277 0.0260 0.0105
-30 0.0005 0.0007 0.0138 0.0182 0.0174 0.0126
-40 0.0004
-50 0.0004
-60 0.0002
-70 0.0002
-80 0.0002
-90 0.0002
-100 0.003

5.4 INVESTIGATION OF THE EUT WITH THE YAGI ANTENNA

5.4.1 YAGI ANTENNA PATTERN AND MPE VERSUS HEIGHT
MPE measurements from the Yagi antenna at the 20-cm distance between the probe and the
antenna were conducted as the electric field strength measurements and the results were
converted to the power density measurements based on the far-filed approximation. Zero azimuth
angle corresponded to the location of the probe in front of the tip of the antenna, as it was shown in
the preliminary investigation that the highest field is radiated from the tip. Results of the Yagi
antenna pattern shown in Table 5.4.1 are significantly below the limit equal to 1 mW/cm2 at the
frequencies above 1.5 GHz.
TABLE 5.4.1: RADIATION PATTERN FOR YAGI ANTENNA13

Azimuth, degree MPE, V/m MPE, mW/cm 2 Azimuth, degree MPE, V/m MPE, mW/cm 2
180 0.0 0.0 180 0.0 0.0
170 0.0 0.0 190 (-170) 0.0 0.0
160 0.0 0.0 200 (-160) 0.0 0.0
150 0.0 0.0 210 (-150) 0.0 0.0
140 0.0 0.0 220 (-140) 0.0 0.0
130 0.0 0.0 230 (-130) 1.5 0.00060
120 0.0 0.0 240 (-120) 2.2 0.00128
110 2.05 0.0012 250 (-110) 2.8 0.00208
100 0.0 0.0 260 (-100) 4 0.00424

13 See footnote 4

24

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

Azimuth, degree MPE, V/m MPE, mW/cm 2 Azimuth, degree MPE, V/m MPE, mW/cm 2
90 0.0 0.0 270 (-90) 2.9 0.0022
80 2.05 0.0011 280 (-80) 3.6 0.0034
70 3.3 0.0029 290 (-70) 2.0 0.0011
60 1.9 0.0010 300 (-60) 4.3 0.0049
50 1.6 0.0007 310 (-50) 2.0 0.0011
45 5.3 0.0075 315 (-45) 4.5 0.0054
40 4.1 0.0045 320 (-40) 3.3 0.0029
35 1.9 0.0010 325 (-35) 1.3 0.0004
30 5.8 0.0089 330 (-30) 4.7 0.0059
25 5.6 0.0083 335 (-25) 4.9 0.0064
20 2.4 0.0015 340 (-20) 1.6 0.0007
15 6.8 0.0123 345 (-15) 7.9 0.0166
10 12.4 0.0408 350 (-10) 12.5 0.0411
5 16.8 0.0749 355 (-5) 17.6 0.0822
0 (360) 18.5 0.0908 0 (360) 19.8 0.1040

Results of the MPE measurements from the Yagi antenna versus height are shown in Table 5.4.2.
The choice of the reference point was made based on the test results shown in Table 5.4.1:
superposition of the antenna and the probe corresponded to zero azimuth between them.
TABLE 5.4.2: MPE FROM THE YAGI ANTENNA VERSUS HEIGHT 14

Height, cm MPE, V/m MPE, mW/ cm 2 Height, cm MPE, V/m MPE, mW/ cm 2
0 18.5 0.0908 0 18.9 0.0948
10 15.80 0.0662 -10 12.5 0.0411
20 7.55 0.0151 -20 4.00 0.0042
30 1.97 0.0010 -30 2.35 0.0015
40 2.24 0.0013 -40 1.55 0.0006
50 2.35 0.0015 -50 0.95 0.0002
60 1.99 0.0011 -60 0.99 0.0003
70 1.77 0.0008 -70 0.76 0.0002
80 1.79 0.0009 -80 0.61 0.0001
90 1.52 0.0006 -90 0.70 0.0002
100 1.24 0.0004 -100 0.40 0.0001

The measurement results show that at the “FCC safe” distance the MPE values from the Yagi
antenna are below the FCC limit.

5.4.2 INFLUENCE OF CO-LOCATION OF THE INTEGRAL ANTENNA
Results of investigation of co-location of the Yagi antenna and the Integral antenna are shown in
Table 5.4.3 and Table 5.4.4. Table 5.4.3 describes influence of the Yagi antenna to the MPE from
the Integral antenna and Table 5.4.4 describes influence of the Integral antenna to the MPE from
Yagi antenna. During these investigation 20 cm distance was maintained between the probe and
the reference point of one of the antennas: When investigation of influence of the Yagi antenna to
the Integral antenna was conducted 20cm distance was maintained between the probe and the
reference point of the Yagi antenna described earlier. When influence of the Integral antenna to
the MPE from Yagi was investigated 20-cm distance was maintained between the probe and the
reference point for the Yagi antenna described in subsection 5.4.1.
14 See footnote 4

25

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

Four setups were investigated:
1. The EUT in the desktop position was 20 cm below the Yagi antenna
2. The EUT in the desktop position was 20 cm to the left from the Yagi antenna
3. The EUT in the wall-mounted position was 20 cm below the Yagi antenna
4. The EUT in the wall-mounted position was 20 cm to the left from the Yagi antenna
TABLE 5.4.3: INFLUENCE OF CO -LOCATION OF THE YAGI ANTENNA TO MPE RESULTS FROM THE INTEGRAL ANTENNA15

MPE, V/m / mW/cm 2
Position of the Yagi Integral H radiates, Integral V radiates, Both Integral H and Both integral V
antenna Only Yagi
Yagi does not Yagi does not Yagi and Yagi
transmits
radiate radiate transmit transmit
Desktop position of the EUT
Yagi is 20 cm above the
0.81 / 0.0002 0.48 / 0.0001 2.13 / 0.0012 2.05/ 0.0011 2.0 /0.0012
EUT
Yagi 20 cm to the right
0.51/ 0.0001 0.47 / 0.0001 3.83 / 0.0042 3.79 / 0.0040 3.8 /0.0039
from the EUT
Wall-mounted position of the EUT
Yagi is 20 cm above the
1.74 / 0.0009 1.11 / 0.0043 2.61 / 0.0018 2.32 / 0.0014 2.12 / 0.0012
EUT
Yagi 20 cm to the right
1.85 / 0.0010 1.25 / 0.0004 3.99 / 0.0042 3.54 / 0.0033 3.24 / 0.0028
from the EUT

TABLE 5.4.4: INFLUENCE OF CO -LOCATION OF THE INTEGRAL ANTENNA TO THE MPE RESULTS FROM THE YAGI ANTENNA16

MPE, V/m / mW/cm 2
Position of the Yagi Integral H radiates, Integral V radiates, Both Integral H and Both integral V
antenna Only Yagi
Yagi does not Yagi does not Yagi and Yagi
transmits
radiate radiate transmit transmit
Desktop position of the EUT
Yagi is 20 cm above the
1.33 / 0.0005 0.68 / 0.0001 19.88 / 0.105 18.66 / 0.0924 18.99 / 0.0957
EUT
Yagi 20 cm to the right
0.39 / 0.0000 0.35 / 0.0000 18.55 / 0.0913 18.88 / 0.0946 17.89 / 0.0849
from the EUT
Wall-mounted position of the EUT
Yagi is 20 cm above the
2.6 / 0.0018 0.55 / 0.0001 18.98 / 0.0959 19.88 / 0.1048 19.50 / 0.1009
EUT
Yagi 20 cm to the right
1.20 / 0.0004 0.36 / 0.0000 18.56 / 0.0915 19.12 / 0.0970 18.90 / 0.0948
from the EUT

15 See footnote 4
16 See footnote 4

26

OET Bulletin 65,
FCC:
360 Herndon PKWY 47 CFR Part 1 and Part 2
Suite 1400 Quote NO: QRTL02- 461
Herndon, VA 20170 Report NO: 2002115
http://www.rheintech.com Model NO: AP1200
Customer: Cisco Systems, Inc.

6 CONCLUSION
MPE levels at the FCC recommended 20 cm distance from the EUT connected either to the 2.2 dBi
Dipole antenna, model AIR-ANT-2506, or to the Yagi antenna, model AIR-ANT-1949, are
significantly below the limits. The EUT passed the test. Co-location of the Integral antenna, model
AIR-RM20A-A-K9, did not change significantly the MPE values from the 2.2 dBi Dipole antenna or
from the Yagi antennas and did not influence the pass/fail criteria for the EUT.
An example of the FCC required a RF safety warning for the user manual for all antennas of this
application17 is shown below:

“The radio module has been evaluated under FCC Bulletin IET 65C and found compliant to
the requirements as set forth in CFR 47 Section 2.1091, 2.1093 and 15.247 (b) (4) addressing
RF Exposure from radio frequency devices. For antennas AIR-ANT4121 and AIR-ANT1949,
the equipment should be positioned more than 2 m (78.7 in) from your body or nearby
persons. All other antennas should be installed 20 cm (11.8 in) from your body or nearby
persons.
The FCC approved indoor / outdoor 2.4 GHz antennas, with the exception of 2.2 dBi Dipole
antenna must be installed to maintain a minimum 20 cm co-located separation distance for
the access point of 5 GHz Integrated antenna. The access point’s co-located 2.4 GHz 2.2
dBi Dipole antenna and 5 GHz Integrated antennas support a minimum separation distance
of 10 cm (3.9 in) and are compliant with the applicable FCC RF exposures limit when
transmitting simultaneously.”

17 “ Antennas of this application” are shown in section 2.5.2 of this report

27

Document Created: 2019-06-08 05:20:26
Document Modified: 2019-06-08 05:20:26

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC