EM 7700 Module FCC MPE Evaluation v16

FCC ID: N7NEM7700

RF Exposure Info

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FCCID_1690983

MPE Evaluation for EM7700 Module 04/24/2012

1. Introduction In this application we seek for modular approval to the EM7700 module for use in standalone and collocated simultaneous transmission under mobile configuration. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for EM7700 module with FCC CFR 47 §2.1091 for standalone and collocated transmission in mobile exposure conditions. The MPE analysis is limited for US bands only. The general population/uncontrolled exposure limits are applicable to situations in which the general public may be exposed or in which persons who are exposed as a consequence of their employment may not be made fully aware of the potential for exposure or cannot exercise control over their exposure. Any collocated transmitter must have a valid FCC ID documenting equivalent or degraded RF characteristics with the collocated parameters defined in this MPE report. A separation distance of 20cm or more shall be maintained between the end user and each WWAN, WiMAX or WLAN, and Bluetooth transmitting antenna. Portable user conditions or additional collocated transmitters not allowed based on this RF exposure analysis require a Class II permissive change and updated RF exposure report.

2. RF Exposure Limits and Equations FCC RULES: According to FCC OET Bulletin 65 Supplement C, the criteria listed in Table 1 shall be used to evaluate the environmental impact of human exposure to radio frequency (RF) radiation as specified in §1.1307. Table 1 : Limits for Maximum Permissible Exposure (MPE) EQUATIONS: Power density is given by : S = EIRP / (4 * Pi * D^2) where S = Power density (mW/cm^2) EIRP = Equivalent Isotropic Radiated Power (mW) D = Separation distance (cm)

3. Product Declarations The EM7700 module can be installed for use in any mobile host as long as the antenna gain of the host antenna does not exceed the gain listed in table 2. This MPE analysis is applicable to any collocated transmitters with transmit power: - less than or equal to 29.0dBm for WLAN/WiMAX; and - less than or equal to 15.0dBm for BT. Specific FCC IDs for those devices are not necessary or identified in this analysis providing they are classified as mobile transmitters. A 100% duty cycle is used for calculations to present a worse-case analysis when applicable. Maximum Conducted Max Antenna Gain (dBi) Max Equipment Transmitter Power Mode Transmitter Category Range (MHz) Duty Cycle (dBm) (W) Standalone Collocated 824 - 849 24.0 0.25 9.5 6.5 HSDPA UMTS 100% HSUPA 1850 - 1910 24.0 0.25 9.0 9.0 Band 17 704 - 716 24.0 0.25 9.0 6.0 LTE 100% Band 4 1710 - 1755 24.0 0.25 6.0 6.0 Table 2: EM7700 Standalone and Collocated Transmission Declarations

4. MPE Calculations The WWAN MPE calculations are based on conservative conducted transmit power exceeding those listed in the FCC ID N7NEM7700 filing. The higher transmit power levels are used to present a worst case assessment. The WiMAX, WLAN, and BT transmit power and antenna gain parameters represent a maximum transmit power for a given frequency band. Integration of either a WiMAX or WLAN, and BT module that exceeds the parameters requires a new FCC authorization or permissive change application. A maximum antenna gain of 5 dBi for WLAN/WiMAX/BT has been assumed for all collocated antennas. Table 3 and 4 summarize transmitter parameters associated with this analysis. 4.1. Individual Transmitter Calculations 4.1.1. Maximum Output Power The maximum power calculations for EM7700 per wireless technology are shown in Table 3 Maximum Maximum Max Maximum Max Max Max Max Frequency Conducted Antenna Duty output Technology Conducted EIRP EIRP ERP ERP (MHz) Power Gain Cycle power Power (W) (dBm) (W) (dBm) (W) (dBm) (dBi) limit 7W UMTS 824 - 849 24.0 0.251 9.5 1.000 33.500 2.239 31.360 1.368 EM7700 module ERP (Standalone) 1850 - 2W UMTS 24.0 0.251 9.0 1.000 33.000 1.995 30.860 1.219 1910 EIRP 3W LTE 704 - 716 24.0 0.251 9.0 1.000 33.000 1.995 30.860 1.219 ERP 1710 - 1W LTE 24.0 0.251 6.0 1.000 30.000 1.000 27.860 0.611 1755 EIRP Table 3: EM7700 Maximum Output Power Calculation According to FCC 2.1091(c), mobile devices that are authorized under subpart H of part 22, 24, and 27, are subject to routine environmental evaluation for RF exposure prior to equipment authorization or use if they operate at frequencies of 1.5GHz or below and their effective radiated power (ERP) is 1.5 watts or more, or if they operate at frequencies above 1.5GHz and their ERP is 3 watts or more. Otherwise, routine environmental evaluation for RF exposure is categorical excluded.

4.1.2. Power Density The power density calculations for the individual transmitters per wireless technology at an exposure minimum separation distance of 20cm are shown in Table 4. For frequency dependent limit, the lowest transmitter frequency was used to represent the lowest MPE limit in this analysis (eg. 824MHz = 0.549mW/cm2) The WiMAX, WLAN, and BT power levels listed represent the worse-case scenario for corresponding frequency ranges given. Maximum Maximum Power Maximum Average Average FCC MPE Frequency Conducted Antenna Duty Density @ Technology Conducted EIRP EIRP Limit (MHz) Power Gain Cycle 20cm Power (W) (dBm) (mW) (mW/cm^2) (dBm) (dBi) (mW/cm^2) UMTS 824 - 849 24.0 0.251 9.5 1.000 33.50 2238.721 0.445 0.549 EM7700 Module (Standalone) 1850 - UMTS 24.0 0.251 9.0 1.000 33.00 1995.262 0.397 1.000 1910 LTE 704 - 716 24.0 0.251 9.0 1.000 33.00 1995.262 0.397 0.469 1710 - LTE 24.0 0.251 6.0 1.000 30.00 1000.000 0.199 1.000 1755 UMTS UMTS 824 - 849 24.0 0.251 6.5 1.000 30.50 1122.018 0.223 0.549 EM7700 Module (Collocated) 1850 - UMTS UMTS 24.0 0.251 9.0 1.000 33.00 1995.262 0.397 1.000 1910 LTE LTE 704 - 716 24.0 0.251 6.0 1.000 30.00 1000.000 0.199 0.469 1710 - LTE LTE 24.0 0.251 6.0 1.000 30.00 1000.000 0.199 1.000 1755 2400 - WLAN 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 2500 5150 - WLAN 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 Other Collocated 5850 Transmitters 2300 - WiMAX 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 2400 2500 - WiMAX 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 2700 3300 - WiMAX 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 3800 2400 - BT BT 15.0 0.032 5.0 1.000 20.00 100.000 0.020 1.000 2500 Table 4: WWAN, WiMAX, WLAN, and BT Individual MPE Calculation

4.2. Collocated MPE Calculation Per OET Bulletin 65, when RF sources have difference frequencies, the fraction of the FCC power density limit shall be determined and the sum of all fractional components shall be less than 1. WLAN/WiMAX WLAN/WiMAX + WLAN/WiMAX Pd (mW/cm^2) BT Pd (mW/cm^2) Limit Band (GHz) BT Pd (mW/cm^2) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.500 0.020 0.520 1.000 3.3 3.8 5.15 - 5.85 Table 5: WLAN/WiMAX + BT Collocated MPE Calculation (850 MHz (WLAN / WWAN WLAN / WiMAX + WLAN / WiMAX FCC MPE + 850 MHz FCC MPE (WWAN 850 WLAN / WiMAX + Limit BT Pd) WWAN Pd Limit MHz) / MPE Limit Pass/Fail WiMAX Band (GHz) BT Pd (mW/cm^2) / (mW/cm^2) (mW/cm^2) Limit) + (mW/cm^2) (MPE BT Limit) fraction) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.520 1.000 0.520 0.223 0.549 0.406 0.926 1.000 Pass 3.3 - 3.8 5.15 - 5.85 Table 6: WWAN 850MHz + WLAN / WiMAX + BT Collocated MPE Calculation

(1900 (WLAN / MHz WLAN / WiMAX WWAN WLAN / WiMAX FCC MPE + 1900 MHz FCC MPE (WWAN 1900 + WiMAX + Limit BT Pd) WWAN Pd Limit MHz) / MPE WLAN / Limit Pass/Fail Band BT Pd (mW/cm^2) / (mW/cm^2) (mW/cm^2) Limit) WiMAX (GHz) (mW/cm^2) (MPE + Limit) BT fraction) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.520 1.000 0.520 0.397 1.000 0.397 0.917 1.000 Pass 3.3 - 3.8 5.15 - 5.85 Table 7: WWAN 1900MHz + WLAN / WiMAX + BT Collocated MPE Calculation (700 (WLAN / MHz WLAN / WIMAX WWAN WLAN / (WWAN WiMAX FCC MPE + 700 MHz + WIMAX FCC MPE Limit 700 MHz) / + Limit BT Pd) WWAN Pd WLAN / Limit Pass/Fail Band (mW/cm^2) MPE BT Pd (mW/cm^2) / (mW/cm^2) WiMAX (GHz) Limit) (mW/cm^2) (MPE + Limit) BT fraction) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.520 1.000 0.520 0.199 0.469 0.424 0.944 1.000 Pass 3.3 - 3.8 5.15 - 5.85 Table 8: WWAN 700MHz + WLAN / WiMAX + BT Collocated MPE Calculation

(1700 (WLAN / MHz WLAN / WIMAX WWAN WLAN / (WWAN WiMAX FCC MPE + 1700 MHz + WIMAX FCC MPE Limit 1700 MHz) + Limit BT Pd) WWAN Pd WLAN / Limit Pass/Fail Band (mW/cm^2) / MPE BT Pd (mW/cm^2) / (mW/cm^2) WiMAX (GHz) Limit) (mW/cm^2) (MPE + Limit) BT fraction) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.520 1.000 0.520 0.199 1.000 0.199 0.719 1.000 Pass 3.3 - 3.8 5.15 - 5.85 Table 9: WWAN 1700MHz + WLAN / WiMAX + BT Collocated MPE Calculation 5. Conclusion Based on FCC OET Bulletin 65 Supplement C and 47 CFR §2.1091, the analysis concludes that the EM7700 module, when transmitting either in standalone or simultaneously with other co-located radio transmitters within a host device, is compliant with the FCC RF exposure requirements in mobile exposure condition, provided the conducted power and antenna gain do not exceed the limits in Table 10 for each given frequency band per wireless technology. Maximum Maximum Antenna Gain Frequency Conducted (dBi) Device Technology (MHz) Power Standalone Collocated (dBm) UMTS 824 - 849 24 9.5 6.5 EM7700 UMTS 1850 - 1910 24 9.0 9.0 LTE 704 - 716 24 9.0 6.0 LTE 1710 - 1755 24 6.0 6.0 WLAN 2400 - 2500 29 5.0 Transmitters WLAN 5150 - 5850 29 5.0 Collocated WiMAX 2300 - 2400 29 5.0 WiMAX 2500 - 2700 29 5.0 WiMAX 3300 - 3800 29 5.0 BT BT 2400 - 2500 15 5.0 Table 10: Summary of Maximum Conducted Power and Antenna Gain


Document Created: 2012-04-24 17:20:56
Document Modified: 2012-04-24 17:20:56
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