AR7594_Module MPE Evaluation

FCC ID: N7NAR7594

RF Exposure Info

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FCCID_3626907

MPE Evaluation for AR7594 Wireless Module October 25, 2017

1. Introduction In this application we seek modular approval for the AR7594 radio module. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for AR7594 radio module with FCC CFR 47 §2.1091 and IC RSS-102 for operation 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 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 collocated transmitting antenna.

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. AR7594 Product Specs AR7594 will transmit on only one band and mode of operation at any one time. Table 3 lists the supported frequency bands in USA and the maximum power in each of those bands. Technology Band UL Freq. (MHz) DL Freq. (MHz) Max Power LTE B7 2500 – 2570 2620 – 2690 25.2 dBm Table 3: AR7594 Frequency Bands and Output Power

4. Stand-Alone Transmission When AR7594 module transmits as a stand-alone mobile device, the source-based time-averaged EIRP is calculated by summing up conducted power and antenna gain. A 100% duty cycle is used for calculations to present a worse-case analysis. The antenna gains are chosen so that the resulted radiated power levels are within the limits specified by the FCC rules and IC Radio Standards Specifications (RSS). The IC exemption limits for routine RF exposure evaluation are calculated using the lowest frequency of the operating band presenting the most stringent limits. As shown in Table 5 below, the resulted EIRP are always below the IC exemption limits for all the operating modes. Maximum Power Maximum Maximum Average FCC MPE Frequency Conducted Duty Density @ Model Technology Conducted Antenna EIRP Limit (MHz) Power Cycle 20cm Power (W) Gain (dBi) (dBm) (mW/cm^2) (dBm) (mW/cm^2) AR7594 LTE B7 2500 – 2570 25.2 0.331 5.0 100% 30.2 0.208 1.000 Table 5: AR7594 Standalone Transmission

4. Collocated Transmission When AR7594 module co-transmits with radio transmitter(s) as a mobile device, per KDB 447498 D01, simultaneous transmission MPE test exclusion applies when the sum of the MPE ratios for all simultaneous transmitting antennas incorporated in a host device, based on the calculated/estimated, numerically modeled or measured field strengths or power density, is ≤ 1.0. The evaluation here considers a WiMAX or WLAN transmitter, and a Bluetooth transmitter as collocated transmitters. Their radiated output power levels are listed in Table 6 below. The MPE ratio is defined by the ratio of power density to MPE limit. The sum of the MPE ratios is calculated as follows: Σ𝑀𝑃𝐸 𝑅𝑎𝑡𝑖𝑜 = Max (AR7594 MPE ratio) + Max (WLAN/WiMax MPE ratio) + BT MPE Ratio = 0.208+0.100+0.006=0.314 < 1.0 Maximum Power FCC Maximum Maximum Average FCC MPE Frequency Conducted Duty Density @ PwrDensit Technology Conducted Antenna EIRP Limit (MHz) Power Cycle 20cm y MPE Power (W) Gain (dBi) (dBm) (mW/cm^2) (dBm) (mW/cm^2) Ratio AR7594 LTE B7 2500 – 2570 25.2 0.331 5.0 100% 30.2 0.208 1.000 0.208 WLAN 2400 -2500 100% 25.00 0.063 1.000 0.063 Other Collocated WLAN 5150 -5850 100% 27.00 0.100 1.000 0.100 Transmitters WiMax 2300 -2400 100% 25.00 0.063 1.000 0.063 WiMax 2500 -2700 100% 25.00 0.063 1.000 0.063 WiMax 3300 -3800 100% 25.00 0.063 1.000 0.063 BT 2400 -2500 100% 15.00 0.006 1.000 0.006 Table 6: AR7594 Collocated Transmission

5. Conclusion The analysis presented in this report concludes that the AR7594 radio module, when transmitting either in standalone or simultaneously with other co-located radio transmitters within a host device, is compliant with the IC RF exposure requirements in mobile exposure condition, provided the conducted power and antenna gain do not exceed the limits in Table 4 for each given frequency band and operating mode. Maximum Antenna Gain (dBi) Technology Frequency (MHz) Standalone Collocated EIRP Limits (dbm) AR7594 LTE B7 2500 – 2570 5 5 WLAN 2400 -2500 25 WLAN 5150 -5850 27 Transmitters Collocated WiMAX 2300 -2400 25 WiMAX 2500 -2700 25 WiMAX 3300 -3800 25 BT BT 2400 -2500 15 Table 7: AR7594 RF Exposure Conditions


Document Created: 2017-10-31 10:52:27
Document Modified: 2017-10-31 10:52:27
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