Additional SAR information

FCC ID: LDK102039

RF Exposure Info

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FCCID_100201

Cisco Systems Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134—1706 http:/www.cisco.com May 7, 2000 > chemhvniawn s oib Dear Sir The attached SAR report for the LOZ102038 is applicable to the Cisc6 model ‘ LDK 102038 which is electrically and mechanically identical to the above model number. This report is also applicable to the radio module LDK102039. This radio module uses the same circuitry as the LDK102038, but is in the Micro ISA form factor instead of the PCMCIA. The Micro ISA operates under the same parameters as the PCM"C"IA card including power output. Please feel free to contact myself if any further information is needed, Best regards, Bd C a— David a. Case NCE Cisco Systems, Inc. Corp Compliance 3875 Embassy Parkway Akron OH 44333 330—664—7396

SAR COMPLIANCE TESTING OF CISCO/AIRONET MODEL LOZ102038 WIRELESS PC April 28, 2000 Submitted to: Mr. David A. Case NCE Senior Compliance Engineer Cisco Systems 3875 Embassy Parkway Akron, OH 44333 Submitted by: Om P. Gandhi Professor of Electrical Engineering University of Utah 50 S Central Campus Dr., Rm. 3280 Salt Lake City, UT 84112—9206

SAR COMPLIANCE TESTING OF CISCO/AIRONET MODEL LOZ102038 WIRELESS PC I. Introduction The U.S. Federal Communications Commission (FCC) has adopted limits of y nagliegths oo n e human exposure to RF emissions from mobile and portable devices that are regulated by the FCC [1]. The FCC has also recently issued Supplement C (Edition 97—01) to OET Bulletin 65 defining both the measurement and the computational procedures that should be followed for evaluating compliance of mobile and portable devices with FCC limits for human exposure to radiofrequency emissions [2]. We have used the measurement procedure given in [2] to obtain peak 1—g SARs for the Cisco/Aironet Model LOZ102038 Wireless PC. A photograph of this unit is shown in £orgiesnes Fig. 1. As seen in Fig. 1, the RF antenna operating in the ISM frequency band 2412—2462 MHz is mounted at the back of the right—hand side of the keyboard. The Cisco/Aironet Model LOZ 102038 operates with a transmit power of up to 30 mW radiated from a printed patch antenna. Since the wireless PC may also be potentially placed on the lap where the RF antenna would be the closest to the body, a planar phantom model was used for all SAR measurements. II. The Tissue—Simulant Model The testing for the SAR distribution for the Cisco/Aironet Model LOZ102038 c onl enrainzciy c . nigg n sbgiie o. o, Wireless PC was done with a planar rectangular box phantom model shown in Fig. 2. This box phantom of external dimensions 30 x 50 cm is filled with. a tissue—simulant fluid up to a depth of 15.5 cm. To maintain flatness of the plantom, the rectangular box is made of acrylic (€, = 2.56) of thickness 6.35 mm. The tissue—simulant fluid uses a composition developed at the University of Utah which consists of 62.0% water, 37.0% sugar and 1% HEC. For this composition, we have measured the dielectric properties using a Hewlett > Packard (HP) Model 85070B Dielectric Probe in conjunction with HP Model 8720C Network Analyzer (50 MHz—20 GHz). The measured dielectric properties at the midband

frequency of 2450 MHz are as follows: g,;= 51.3 + 1.7 and 0 = 1.76 + 0.07 S/m. From reference 3, we obtain the desired dielectric properties to simulate the muscle tissue to be E; = 52.7 and G = 1.74 S/m. Thus, the measured properties for the muscle—simulant fluid are close to the desired values. III. The Measured SAR Distributions The SAR distribution was determined using the automated SAR measurement system developed at the University of Utah [4]. As described in [4], this SAR measurement system has been validated using a number of wireless telephones at 835 and 1900 MHz, respectively. The highest SAR region was identified in the first instance by using a coarser sampling with a step size of 8.0 mm over three overlapping areas for a total scan area of 8.0 x 9.6 cm. After identifying the region of the highest SAR, the SAR distribution was measured with a resolution of 2 mm in order to obtain the peak 1 cm? or 1—g SAR. The measured SAR distribution for the Cisco/Aironet Model LOZ102038 Wireless PC operated in the maximum radiation mode (maximum radiated power of 30 mW) is given in Table 1. The peak 1—g SAR is determined to be 0.047 W/kg. IV. Comparison of the Data With FCC 96—326 Guidelines According to the FCC 96—326 Guidelines [1], the peak SAR for any 1—g of tissue should not exceed 1.6 W/kg. For the maximum radiated power condition, the Cisco/Aironet Model LOZ102038 Wireless PC has been measured to give a peak 1—g SAR of 0.047 W/kg which is considerably smaller than 1.6 W/kg.

REFERENCES Federal Communications Commission, "Guidelines for Evaluating the Environmental Effects of Radiofrequency Radiation," FCC 96—326, August 1, 1996. K. Chan, R. F. Cleveland, Jr., and D. L. Means, "Evaluating Compliance With FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields," Supplement C (Edition 97—01) to OET Bulletin 65, December, 1997. Available from Office of Engineering and Technology, Federal Commumcatlons Commission, Washington D.C., 20554. http://Sparc 10.iroe.fi.car.it/tissprop/. Q. Yu, 0. P. Gandhi, M. Aronsson, and D. Wu, "An Automated SAR Measurement System for Compliance Testing of Personal Wireless Devices," IEEE Transactions on Electromagnetic Compatibility, Vol. 41(3), pp. 234—245, August 1999.

Table 1. The SARs measured for Cisco/Aironet Model LOZ102038 Wireless PC. The SARs in W/kg are measured with a step size of 2 mm for the highest SAR region. 1—g SAR = 0.047 W/kg a. At depth of 1 mm 0.036 0.068 0.066 0.075 0.078 0.055 0.053 0.062 0.072 0.083 0.083 0.079 0.082 0.085 0.093 0.074 0.078 0.081 0.084 0.095 0.079 0.079 0.085 0.084 0.078 b. At depth of 3 mm 0.041 0.05 1 0.051 0.057 0.058 0.049 0.05 1 0.055 0.059 0.062 0.058 0.058 0.061 0.063 0.065 0.056 0.059 0.062 0.063 0.069 0.061 0.062 0.064 0.065 0.062 c. At depth of 5 mm 0.043 0.037 0.039 0.042 0.042 0.043 0.048 0.047 0.046 0.044 0.038 0.041 0.044 0.045 0.043 0.042 0.043 0.047 0.046 0.048 0.046 0.048 0.047 0.048 0.049 d. At depth of 7 mm 0.040 0.026 0.029 0.030 0.029 0.037 0.043 0.038 0.036 0.03 1 0.024 0.028 0.031 0.031 0.027 0.030 0.031 0.035 0.034 0.032 0.035 0.036 0.034 0.036 0.040 e. At depth of 9 mm 0.034 0.018 0.022 0.021 0.020 0.030 0.036 0.029 0.027 0.022 0.015 0.020 0.022 0.020 0.017 0.022 0.022 0.026 0.025 0.022 0.027 0.027 0.025 0.027 0.033

Fig. 1. Photograph of Cisco/Aironet Model LOZ102038 Wireless PC with RF antenna inserted at the back on the right—hand side of the keyboard. PC Model LOZ102038 Wireless — 2. Fig. Photograph 0 £ Cisco/Aironet d against the bottom of the planar mounted with its bottom presse tissue—simulant phantom.


Document Created: 2000-05-13 01:23:26
Document Modified: 2000-05-13 01:23:26
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