AR7582_Module MPE Evaluation

FCC ID: N7NAR7582

RF Exposure Info

Download: PDF
FCCID_3921246

MPE Evaluation for AR7582 Wireless Module June 21, 2018

1. Introduction In this application we seek modular approval for the AR7582 radio module. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for AR7582 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 / 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 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) 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)

In the frequency range of 300-6000 MHz, the IC limits are more stringent than the FCC limits. The MPE evaluation in this report will be based on the IC limits, so the deduced output power and antenna gain limits will guarantee compliance with both FCC and IC requirements. 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. AR7582 Product Specs AR7582 will transmit on only one band and mode of operation at any one time. Table 3 lists the supported frequency bands in Canada/USA and the maximum power in each of those bands. Technology Band UL Freq. (MHz) DL Freq. (MHz) Max Power B2 1850 – 1910 1930 – 1990 25.7 dBm B4 1710 – 1755 2110 – 2155 25.7 dBm B5 824 – 849 869 – 894 25.7 dBm LTE B7 2500 – 2570 2620 – 2690 25.7 dBm B12 699 – 716 729 – 746 25.7 dBm B13 777 – 787 746 – 756 25.7 dBm B17 704 – 716 734 – 746 25.7 dBm B2 1850 – 1910 1930 – 1990 25.7 dBm WCDMA/HSDPA/HSUPA B4 1710-1755 2110 - 2155 25.7 dBm B5 829 – 849 864 – 894 25.7 dBm G850 829 – 849 864 – 894 35 dBm GSM G1900 1850 – 1910 1930 – 1990 32 dBm G850 829 – 849 864 – 894 30 dBm EDGE G1900 1850 – 1910 1930 – 1990 29 dBm Table 3: AR7582 Frequency Bands and Output Power AR7582 supports multislot Class 12 GPRS and Class 12 EGPRS with power backoff for GMSK modulation at 3 and 4 times slots, as specified in Table 4. Power Backoff (dB) Power Class Mode Band Coding Scheme Modulation Time Slot1 Time Slot2 Time Slot3 Time Slot4 GSM850 MCS1 - MCS4 GMSK 0 2 4 5 12 EGPRS GSM850 MCS5 - MCS9 8PSK 0 0 0 0 GSM1900 MCS1 - MCS4 GMSK 0 2 4 5 GSM1900 MCS5 - MCS9 8PSK 0 0 0 0 Table 4: AR7582 Power Backoff

4. Stand-Alone Transmission When AR7582 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 IC Maximum Maximum Average ERP/ Frequency Conducted Duty Density @ Exemption Technology Conducted Antenna EIRP EIRP (MHz) Power Cycle 20cm Limit (EIRP) Power (W) Gain (dBi) (dBm) (dBm) Limits (dBm) (W/m^2) G850-GMSK 824 - 849 33 1.995 4.0 25% 30.99 2.50 31.10 7W ERP (2TS) G850-GMSK 824 - 849 31 1.259 4.0 38% 30.79 2.39 31.10 7W ERP (3TS) G850-GMSK 824 - 849 30 1.000 4.0 50% 30.99 2.50 31.10 7W ERP AR7582 module(Standalone) (4TS) G850-8PSK 824 - 849 30 1.000 4.0 25% 27.98 1.25 31.10 7W ERP (2TS) G850-8PSK 824 - 849 30 1.000 4.0 38% 29.80 1.90 31.10 2W EIRP (3TS) G850-8PSK 824 - 849 30 1.000 4.0 50% 30.99 2.50 31.10 2W EIRP (4TS) G1900-GMSK 1850 - 1910 27 0.501 5.0 50% 28.99 1.58 33.50 2W EIRP (4TS) G1900-8PSK 1850 - 1910 29 0.794 5.0 50% 30.99 2.50 33.50 2W EIRP (4TS) WCDMA B II 1850 - 1910 25.7 0.372 5.0 100% 30.70 2.34 33.50 2W EIRP WCDMA B IV 1710 - 1755 25.7 0.372 4.0 100% 29.7 1.86 33.27 1W EIRP WCDMA B V 824 - 849 25.7 0.372 4.0 100% 29.70 1.86 31.10 7W ERP LTE B2 1850 – 1910 25.7 0.331 5.0 100% 30.7 2.34 33.50 2W EIRP LTE B4 1710 – 1755 25.7 0.331 4.0 100% 29.7 1.86 33.27 1W EIRP LTE B5 824 – 849 25.7 0.331 4.0 100% 29.7 1.86 31.10 7W ERP LTE B7 2500 – 2570 25.7 0.331 5.0 100% 30.7 2.34 34.39 2W EIRP LTE B12 699 – 716 25.7 0.331 4.0 100% 29.7 1.86 30.61 3W ERP LTE B13 777 – 787 25.7 0.331 4.0 100% 29.7 1.86 30.93 7W ERP LTE B17 704 – 716 25.7 0.331 4.0 100% 29.7 1.86 30.64 7W ERP Table 5: AR7582 Standalone Transmission

4. Collocated Transmission When AR7582 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 (AR7582 MPE ratio) + Max (WLAN/WiMax MPE ratio) + BT MPE Ratio = 0.769+0.192+0.037=0.998 < 1.0 Maximum Power Maximum Maximum Average IC MPE IC Frequency Conducted Duty Density @ Technology Conducted Antenna EIRP Limit PwrDensity (MHz) Power Cycle 20cm Power (W) Gain (dBi) (dBm) (W/m^2) MPE Ratio (dBm) (W/m^2) G850-GMSK(2TS) 824 - 849 33 2.00 3.0 25% 30.99 1.98 2.58 0.767 G850-GMSK(3TS) 824 - 849 31 1.58 3.0 38% 30.79 1.90 2.58 0.736 G850-GMSK(4TS) 824 - 849 30 1.26 3.0 50% 30.99 1.98 2.58 0.769 G850-8PSK(2TS) 824 - 849 30 0.63 3.0 25% 27.98 0.99 2.58 0.385 G850-8PSK(3TS) 824 - 849 30 0.63 3.0 38% 29.80 1.51 2.58 0.585 G850-8PSK(4TS) 824 - 849 30 0.63 3.0 50% 30.99 1.98 2.58 0.769 AR7582 module (Collocated) G1900-GMSK(4TS) 1850 - 1910 27 0.63 5.0 50% 28.99 1.58 4.48 0.352 G1900-8PSK(4TS) 1850 - 1910 29 0.50 5.0 50% 30.99 2.50 4.48 0.558 WCDMA Band II 1850 - 1910 25.7 0.25 5.0 100% 30.70 2.34 4.48 0.522 WCDMA Band IV 1710 - 1755 25.7 0.372 4.0 100% 29.7 1.86 4.24 0.438 WCDMA Band V 824 - 849 25.7 0.372 3.0 100% 29.70 1.47 2.58 0.572 LTE B2 1850 – 1910 25.7 0.331 5.0 100% 30.2 2.34 4.48 0.522 LTE B4 1710 – 1755 25.7 0.331 4.0 100% 29.2 1.86 4.24 0.438 LTE B5 824 – 849 25.7 0.331 3.0 100% 29.2 1.47 2.58 0.572 LTE B7 2500 – 2570 25.7 0.331 5.0 100% 30.2 2.34 5.50 0.425 LTE B12 699 – 716 25.7 0.331 3.0 100% 29.2 1.47 2.30 0.641 LTE B13 777 – 787 25.7 0.331 3.0 100% 29.2 1.47 2.47 0.597 LTE B17 704 – 716 25.7 0.331 3.0 100% 29.2 1.47 2.31 0.638 WLAN 2400 -2500 100% 27.00 1.00 5.35 0.187 Other Collocated WLAN 5150 -5850 100% 27.00 1.00 9.01 0.111 Transmitters WiMax 2300 -2400 100% 27.00 1.00 5.19 0.192 WiMax 2500 -2700 100% 27.00 1.00 5.50 0.181 WiMax 3300 -3800 100% 27.00 1.00 6.65 0.150 BT 2400 -2500 100% 20.00 0.20 5.35 0.037 Table 6: AR7582 Collocated Transmission

5. Conclusion The analysis presented in this report concludes that the AR7582 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) EIRP Limits Technology Frequency (MHz) (dbm) Standalone Collocated GPRS/EDGE 850 824-849 4 3 GPRS/EDGE 1900 1850-1910 5 5 UMTS 850 824-849 4 3 UMTS 1700 1710-1755 4 4 UMTS 1900 1850-1910 5 5 AR7582 LTE B2 1850 – 1910 5 5 LTE B4 1710 – 1755 4 4 LTE B5 824 – 849 4 3 LTE B7 2500 – 2570 5 5 LTE B12 699 – 716 4 3 LTE B13 777 – 787 4 3 LTE B17 704 – 716 4 3 WLAN 2400 -2500 27 WLAN 5150 -5850 27 Transmitters Collocated WiMAX 2300 -2400 27 WiMAX 2500 -2700 27 WiMAX 3300 -3800 27 BT BT 2400 -2500 20 Table 7: AR7582 RF Exposure Conditions


Document Created: 2018-06-21 14:13:55
Document Modified: 2018-06-21 14:13:55
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC