888E antenna spec 1to20

FCC ID: I4L-MS6820

Operational Description

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FCCID_355262

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General Information

z Measurement Resume

Date Engineer 2.4~2.5 GHz 5.15~5.35 GHz 5.47~5.725 GHz 5.725~5,825 GHz
92/04/30 Charles Teng ●

z Antenna specifications: maximum size, unit: mm

PIFA Type Length Width Height Cable length
Right Side 39.0 5.7 4.8 460
Left Side

z Measurement Setup & Environment

Temp. Humidity Instrument System Entry
VSWR,
VNA HP8753ES, NSI antenna
20℃ 50% Return,
7x4x4 m anechoic chamber measurement system
Radiation pattern

REV. A 2003/04/30 page:1

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Spectrum Allocation in worldwide WLAN

Hyperlan/2 Hyperlan/2
Europe 5.15~5.35GHz 5.47~5.725GH

MMAC HiSWANa
Japan
5.15~5.25GHz

U-NII U-NII
US 5.15~5.35GHz 5.725~5.825GHz

802.11b
Global 2.4~2.5GHz

GHz
2 3 5 6
802.11b 802.11a+Hyperlan/2
band band

REV. A 2003/04/30 page:4

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Typical Performance of Antenna

I. Typical Performance Table
2.4~2.5GHz 5.15~5.25GHz 5.15~5.35GHz 5.47~5.825GHz
VSWR 1.24
Peak Gain 3.12 dBi
Average Gain -1.45 dBi

II. Antenna Type
Main Antenna Aux Antenna
Position
(Right-side Antenna) (Left-side Antenna)
Antenna
PIFA PIFA
Type

Material Metal sheet Metal sheet

III. VSWR
2.4GHz ISM JAPAN U-NII,Hyperlan/2 U-NII+HiperLAN/2
2.4~2.5GHz 5.15~5.25GHz 5.150~5.35GHz 5.47~5.825GHz
Freq (GHz)
2.40 2.45 2.50 5.15 5.25 5.15 5.25 5.35 5.47 5.6 5.825

MAIN 1.53 1.15 1.31

AUX

IV. Peak Gain and Average Gain
Freq 2.4GHz ISM JAPAN U-NII,Hyperlan/2 U-NII+HiperLAN/2
(GHz) 2.4~2.5GHz 5.15~5.25GHz 5.150~5.350GHz 5.470~5.825GHz
Gain
2.40 2.45 2.50 5.15 5.25 5.15 5.25 5.35 5.47 5.6 5.825
(dBi)
Peak 2.21 3.12 2.66
MAIN
Avg -1.63 -1.45 -2.00
Peak
AUX
Avg

REV. A 2003/04/30 page:5

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Return Loss & VSWR

R-Antenna

0

10

-10

8
Return Loss (dB)

-20

VSWR
6

-30

4

-40

2

-50
2.0 2.2 2.4 2.6 2.8 3.0
Frequency ( GHz)

2.4~2.5 GHz Center freq. @MHz 2450

Beam Width @MHz 120

freq. Return Loss(dB) VSWR

2.4 GHz -14.3 1.53
2.45 GHz -20.4 1.15
2.5 GHz -13.4 1.31

REV. A 2003/04/30 page:6

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Radiation Pattern
antenna(2.4~2.5 GHz)
Note: horizontal polarization plots in the red line
and vertical polarization in the blue one

Far-field amplitude of YZ-2.45 H&V
Hcut Vcut
0
345 15

330 30

315 45
Average Gain And Peak Gain (On Azimuth Plane)

300 60
Y-Z Plane
285 75
Avg. Gain (dBi) -3.28
270 90
-30 -20 -10 0dB

Avg. Gain (dBi) -3.31
255 105

240 120
Peak Gain (dBi) 3.12
225 135

210 150

195 165
180

Far-field amplitude of XZ-2.45 H&V
Hcut Vcut
0
345 15

330 30

315 45
Average Gain And Peak Gain (On Azimuth Plane)

300 60
Z-X Plane
285 75
Avg. Gain (dBi) -6.50
270 90
-30 -20 -10 0dB

Avg. Gain (dBi) -6.54
255 105

240 120
Peak Gain (dBi) 0.09
225 135

210 150

195 165
180

REV. A 2003/04/30 page:7

HIGH-TEK

Appendix

VSWR : Voltage standing wave ratio on a transmission line in an antenna
system. The ratio of the forward to reflected voltage on the line,
and not a power ratio. A VSWR of 1:1 occurs when all parts of the
antenna system are matched correctly.

Return Loss : When the load is mismatched, then, not all of the available power
from the generator is delivered to the load. This ‘loss ’is called
return loss(RL).

Radiation pattern : The radiation characteristics of an antenna as a function of spatial
coordinates. Normally, the pattern is measured in the far-field
region and is represented graphically.

Polarization : The sense of the wave radiated by an antenna. This can be horizontal,
vertical, elliptical , or circular (left or right hand circularity),
depending on the design and application. The polarization of the
antenna is based on the orientation of the electric or E field
component. The polarization must be matched between two antennas
to receive the maximum field intensity. Dependent on the antenna
type, it is possible to radiate linear, elliptical and circular
polarizations.

Gain value : The increase in effective radiated power in the desired direction
of the major lobe.

Peak gain : The highest gain value in 360 degrees, which means the antenna
efficiency at this angle is the best.

Cable loss : When RF signal transmitting in the coaxial cable, due to the material
of the cable, the power may dissipate into to the air in the form
of heat. So when we try to measure the gain of an antenna, we have
to offset the cable loss. The power loss of coaxial cable(Φ=1.13
mm) at 2.4~2.5 GHz is 3dB per 1000 mm and 5dB per 1000 mm at 5.15~5.35
GHz. In this case, the cable length is about 460 mm , so the cable
loss when RF signal transmitting at 2.4~2.5 GHz is about 1.4 dB .
Which means we have to offset the cable loss to the gain value that
we measure from the radiation pattern and that is the true antenna
REV. A 2003/04/30 page:8

HIGH-TEK
gain (Ga) we want .

REV. A 2003/04/30 page:9

HIGH-TEK

Material Specification
z Connector (I-PEX)

z Coaxial Cable (HITACHI & SUMITOMO)

z PORON

z T4000

z Metal

z TUBE

z Mylar

REV. A 2003/04/30 page:10

Document Created: 2003-08-19 15:00:36
Document Modified: 2003-08-19 15:00:36

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