EM7305 Module FCC MPE Evaluation

FCC ID: N7NEM7305

RF Exposure Info

Download: PDF
FCCID_2177361

MPE Evaluation for EM7305 Radio Module January 20, 2014

1. Introduction In this application we seek for modular approval to the EM7305 wireless module for use in standalone and collocated simultaneous transmission under mobile configuration. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for EM7305 wireless 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. 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) 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 EM7305 wireless 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 Max Conducted Max Antenna Gain (dBi) Equipment Transmitter Mode Transmitter Power Category Range (MHz) Duty Cycle (dBm) (W) Standalone Collocated 824-849 33.0 2.00 6.5 3.0 GPRS Class 10 25% 1850-1910 30.0 1.00 3.0 3.0 824-849 28.0 0.63 6.5 3.0 EDGE Class 12 50% 1850-1910 27.0 0.50 3.0 3.0 HSDPA 824 - 849 24.0 0.25 6.5 3.0 UMTS 100% HSUPA 1850 - 1910 24.0 0.25 3.0 3.0 Table 2: EM7305 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 N7NEM7305 and IC number 2417C-EM7305 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 maximum power calculations for EM7305 per wireless technology are shown in Table 3 Maximu Maximum Maximum Max m Max Max Max Frequency Conducted Conducte Duty output Technology Antenna EIRP EIRP ERP (MHz) Power d Power Cycle power Gain (dBm) (W) (W) (dBm) (W) limit (dBi) GPRS 2 UL 824-849 33.0 1.995 6.5 0.250 39.5 5.43 7 W ERP EM7305 module EDGE 4UL 824-849 28.0 0.631 6.5 0.500 34.5 1.72 7 W ERP (Standalone) GPRS 2 UL 1850-1910 30.0 1.000 3.0 0.250 33.0 1.995 2 W EIRP EDGE 4UL 1850-1910 27.0 0.501 3.0 0.500 30.0 1.000 2 W EIRP UMTS 824 - 849 24.0 0.25 6.5 1.000 30.5 0.684 7 W ERP UMTS 1850 - 1910 24.0 0.25 3.0 1.000 27.0 0.501 2 W EIRP Table 3: EM7305 Maximum Output Power Calculation

4.1.2. Standalone 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) Maximum Maximum Power Maximum FCC MPE Frequency Conducted Antenna Duty Density @ Technology Conducted Limit (MHz) Power Gain Cycle 20cm Power (W) (mW/cm^2) (dBm) (dBi) (mW/cm^2) GPRS 2 UL 824-849 33.0 1.995 6.5 0.250 0.44 0.549 EM7305 Module EDGE 4UL 824-849 28.0 0.631 6.5 0.500 0.28 0.549 (Standalone) GPRS 2 UL 1850-1910 30.0 1.000 3.0 0.250 0.10 1.000 EDGE 4UL 1850-1910 27.0 0.501 3.0 0.500 0.10 1.000 UMTS 824 - 849 24.0 0.25 6.5 1.000 0.22 0.549 UMTS 1850 - 1910 24.0 0.25 3.0 1.000 0.10 1.000 Table 4: EM7305 Standalone MPE Calculation 4.2. Collocated MPE Calculation The WiMAX, WLAN, and BT power levels listed represent the worse-case scenario for corresponding frequency ranges given. Maximum Maximum Power Maximum FCC MPE Frequency Conducted Antenna Duty Density @ Technology Conducted Limit (MHz) Power Gain Cycle 20cm Power (W) (mW/cm^2) (dBm) (dBi) (mW/cm^2) GPRS 2 UL 824-849 33.0 1.995 3.0 0.250 0.20 0.549 EM7305 Module EDGE 4UL 824-849 28.0 0.631 3.0 0.500 0.13 0.549 (Collocated) GPRS 2 UL 1850-1910 30.0 1.000 3.0 0.250 0.10 1.000 EDGE 4UL 1850-1910 27.0 0.501 3.0 0.500 0.10 1.000 UMTS 824 - 849 24.0 0.25 3.0 1.000 0.10 0.549 UMTS 1850 - 1910 24.0 0.25 3.0 1.000 0.10 1.000 WLAN 2400 - 2500 29.0 0.794 5.0 1.000 0.50 1.000 Other Collocated WLAN 5150 - 5850 29.0 0.794 5.0 1.000 0.50 1.000 Transmitters WiMax 2300 - 2400 29.0 0.794 5.0 1.000 0.50 1.000 WiMax 2500 - 2700 29.0 0.794 5.0 1.000 0.50 1.000 WiMax 3300 - 3800 29.0 0.794 5.0 1.000 0.50 1.000 BT 2400 - 2500 15.0 0.032 5.0 1.000 0.02 1.000 Table 5: EM7305 Collocated MPE Calculation

Per OET Bulletin 65 and KDB 447498 D01, when transmitters are used in mobile exposure conditions for simultaneous transmission operations, the sum of the MPE ratios for all simultaneous transmitting antennas incorporated in a host device must not exceed 1.0. The maximum MPE ratio of EM7305 = 0.20/0.549 = 0.36 The maximum MPE ratio of other collocated transmitters = 0.5/1 = 0.5 Therefore the sum of the MPE ratios for all simultaneous transmitting antennas will not exceed 0.86 (=0.36+0.5). 5. Conclusion Based on FCC OET Bulletin 65 Supplement C and 47 CFR §2.1091, the analysis concludes that the EM7305 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 Frequency Conducted (dBi) Device Technology (MHz) Power Standalone Collocated (dBm) 824 - 849 33.0 6.5 3.0 GPRS 1850 – 1910 30.0 3.0 3.0 EM7305 824 – 849 28.0 6.5 3.0 EDGE 1850 - 1910 27.0 3.0 3.0 824 - 849 24.0 6.5 3.0 UMTS 1850 - 1910 24.0 3.0 3.0 WLAN 2400 - 2500 29.0 5.0 Transmitters WLAN 5150 - 5850 29.0 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 6: Summary of Maximum Conducted Power and Antenna Gain


Document Created: 2014-01-20 16:31:07
Document Modified: 2014-01-20 16:31:07
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC