EM7345 Module FCC MPE Evaluation v3

FCC ID: N7NEM7345

RF Exposure Info

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FCCID_2408622

MPE Evaluation for EM7345 Radio Module September 24, 2014

1. Introduction In this application we seek modular approval to the EM7345 radio module for use in standalone and collocated simultaneous transmission under mobile configuration. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for EM7345 radio module with FCC CFR 47 §2.1091 and IC RSS-102 for standalone and collocated transmission in mobile exposure conditions. The MPE analysis is limited for US / Canada bands only. A separation distance of 20cm or more shall be maintained between the end user and each WWAN, WiMAX or WLAN, and Bluetooth transmitting antenna. 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. 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)

IC RULES: IC has adopted the RF field strength limits established in Health Canada’s RF exposure guideline. The limits are shown in Table 2 below per RSS- 102. Table 2 : RF Field Strength Limits for Devices Used by the General Public (Uncontrolled Environment) 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 EM7345 radio module supports multiple bands / modes operation. Table 2 lists the output power levels of all the bands / modes supported by the product and permitted in Canada/USA. The operating mode with the highest time-averaged power level for each frequency band is marked in red. Maximum Max Transmitter Conducted Equipment Mode Transmitter Frequency Power Category Duty Cycle (MHz) (dBm) (W) 824-849 33.0 2.00 Class 11 37.5% 1850-1910 30.0 1.00 GPRS 824-849 32.0 1.58 Class 12 50% 1850-1910 29.0 0.79 824-849 28.0 0.63 Class 10 25% 1850-1910 27.0 0.50 EDGE 824-849 27.0 0.50 Class 11 37.5% 1850-1910 26.0 0.40 824-849 26.0 0.40 Class 12 50% 1850-1910 25.0 0.32 Band 5 824 - 849 24.5 0.28 UMTS Band 4 100% 1710-1755 24.5 0.28 Band 2 1850 - 1910 24.5 0.28 704 - 716 24.0 0.25 Band 17 777 - 787 24.0 0.25 Band 13 824 - 849 24.0 0.25 Band 5 LTE 100% 1710 - 1755 24.0 0.25 Band 4 Band 2 1850 - 1910 24.0 0.25 Band 7 2500 - 2570 24.0 0.25 Table 2: EM7345 Output Powers

4. MPE Calculations The WWAN MPE calculations are based on conservative conducted transmit power exceeding those listed in the FCC ID N7NEM7345 and IC number 2417C-EM7345 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, 4, and 5 summarize transmitter parameters associated with this analysis.

4.1. Individual Transmitter Calculations 4.1.1. Maximum Output Power The radiated power calculations for EM7345 per wireless technology are shown in Table 3 and the resulted EIRP/ERP are all within the limits. Max Max Max Max Max Max Max Frequency Conducted Antenna EIRP output Technology EIRP ERP ERP (MHz) Power Gain (dBm power (W) (dBm) (W) (dBm) (dBi) ) limit GPRS / EDGE 824-849 33 5 38 6.31 35.85 3.85 7 W ERP GPRS / EDGE 1850-1910 30 3 33 2.00 30.86 1.22 2 W EIRP UMTS 824 - 849 24.5 5 29.5 0.89 28.36 0.69 7 W ERP UMTS 1710 -1755 24.5 5 29.5 0.89 27.86 0.61 1 W EIRP EM7345 module (Standalone) UMTS 1850 -1910 24.5 3 27.5 0.56 24.86 0.31 2 W EIRP LTE 704 - 716 24 9 33 2.00 30.86 1.22 3 W ERP LTE 777 - 787 24 9 33 2.00 30.86 1.22 3 W ERP LTE 824 - 849 24 5 29 0.79 28.36 0.69 7 W ERP LTE 1710 - 1755 24 5 29 0.79 27.86 0.61 1 W EIRP LTE 1850 - 1910 24 3 27 0.50 24.86 0.31 2 W EIRP LTE 2500 - 2570 24 9 33 2.00 30.86 1.22 2 W EIRP Table 3: EM7345 Radiated Power Calculation

4.1.2. Standalone Power Density Calculations The power density calculations for the individual transmitter at a separation distance of 20 cm are shown in Table 4. For each frequency band, only the mode with the highest time-averaged power is assessed. For frequency-dependent limit, the lowest transmitter frequency was used to represent the lowest MPE limit in this analysis. Max Max Power Lowest Max FCC/IC MPE Operating Conducted Antenna Duty Density TX Freq Conducted Limit Mode Power Gain Cycle @20 cm (MHz) Power (W) (mW/cm^2) (dBm) (dBi) (mW/cm^2) GPRS 4UL (Cellular) 824 32 1.58 5 50% 0.50 0.55 GPRS 4UL (PCS) 1850 29 0.79 3 50% 0.16 1.00 UMTS (Band 4) 1710 24.5 0.28 5 100% 0.18 1.00 LTE (Band 17) 704 24 0.25 9 100% 0.40 0.47 LTE (Band 13) 777 24 0.25 9 100% 0.40 0.52 LTE (Band 7) 2500 24 0.25 9 100% 0.40 1.00 Table 4: EM7345 Standalone MPE Calculation

4.2. Collocated MPE Calculation Table 5 below shows the MPE calculation when the EM7345 module is transmitting simultaneously with collocated WiMAX, WLAN, and BT transmitters. The power levels listed represent the worse-case scenario for corresponding frequency ranges given. Maximum Maximum Power Power FCC MPE Density Frequency Conducted Antenna Duty Density @ Technology Limit to MPE (MHz) Power Gain Cycle 20cm (mW/cm^2) Ratio (dBm) (dBi) (mW/cm^2) GPRS 4 UL 824-849 32 3 50% 0.31 0.549 0.57 1850- GPRS 4 UL 29 3 50% 0.16 1.000 0.16 EM7345 Module 1910 (Collocated) 1710- UMTS (Band 4) 24.5 5 100% 0.11 1.000 0.11 1755 LTE (Band 17) 704 - 716 24 6 100% 0.20 0.469 0.42 LTE (Band 13) 777 - 787 24 6 100% 0.20 0.518 0.38 2500- LTE (Band 7) 24 9 100% 0.40 1.000 2570 0.40 2400 - 28 5 1.000 0.40 1.000 Other Collocated Transmitters WLAN 0.40 2500 5150 - WLAN 28 5 1.000 0.40 1.000 0.40 5850 2300 - WiMax 28 5 1.000 0.40 1.000 0.40 2400 2500 - WiMax 28 5 1.000 0.40 1.000 0.40 2700 3300 - WiMax 28 5 1.000 0.40 1.000 0.40 3800 2400 - BT 15.0 5 1.000 0.02 1.000 0.02 2500 Table 5: EM7345 Collocated MPE Calculation Adding the highest MPE ratios of WWAN, WiMAX/WLAN and BT transmitters, the max MPE ratio sum is as follows: Max MPE ratio sum = 0.57+0.40+0.02 = 0.99 < 1.0

5. Conclusion The analysis above concludes that the EM7345 wireless module, when transmitting either in standalone or simultaneously with other co-located radio transmitters within a host device, is compliant with the FCC/IC RF exposure requirements in mobile exposure condition, provided the conducted power and antenna gain do not exceed the limits in Table 6 for each given frequency band per wireless technology. Maximum Maximum Antenna Gain (dBi) Frequency Device Technology Conducted (MHz) Power (dBm) Standalone Collocated 824 - 849 33 5.0 3.0 GPRS 1850 – 1910 30 3.0 3.0 824 – 849 28 5.0 3.0 EDGE 1850 - 1910 27 3.0 3.0 824 - 849 24.5 5.0 3.0 UMTS 1710 – 1755 24.5 5.0 6.0 EM7345 1850 - 1910 24.5 3.0 3.0 704 - 716 24 9.0 6.0 777 – 787 24 9.0 6.0 824 – 849 24 5.0 3.0 LTE 1710 – 1755 24 5.0 3.0 1850 – 1910 24 3.0 3.0 2500 - 2570 24 9.0 9.0 WLAN 2400 - 2500 28 5.0 28 Transmitters WLAN 5150 - 5850 5.0 Collocated WiMAX 2300 - 2400 28 5.0 WiMAX 2500 - 2700 28 5.0 WiMAX 3300 - 3800 28 5.0 BT BT 2400 - 2500 15 5.0 Table 6: Summary of Maximum Conducted Power and Antenna Gain


Document Created: 2014-09-24 13:57:02
Document Modified: 2014-09-24 13:57:02
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