AR7552 Module FCC MPE Evaluation_v3

FCC ID: N7NAR7552

RF Exposure Info

Download: PDF
FCCID_2647457

MPE Evaluation for AR7552 Wireless Module May 14, 2015

1. Introduction In this application we seek for modular approval to the AR7552 wireless module for use in standalone and collocated simultaneous transmission under mobile configuration. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for AR7552 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 AR7552 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 3. 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. Max Transmitter Maximum Maximum Antenna Gain Equipment Conducted Power (dBi) Mode Transmitter Range Category Duty Cycle (MHz) (dBm) (W) Standalone Collocated HSDPA 824-849 25.7 0.37 5.0 5.0 UMTS 100% HSUPA 1850-1910 25.7 0.37 5.0 5.0 Band 2 1850 - 1910 25.0 0.32 5.0 5.0 Band 4 1710 - 1755 25.0 0.32 5.0 5.0 LTE Band 5 100% 824 - 849 25.0 0.32 5.0 5.0 Band 7 2500 - 2570 25.7 0.37 7.0 7.0 Band 17 704 - 716 25.0 0.32 5.0 5.0 Table 3: AR7552 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 N7NAR7552 and IC number 2417C-AR7552 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 4, 5, and 6 summarize transmitter parameters associated with this analysis.

4.1. Individual Transmitter Calculations 4.1.1. Maximum Output Power The maximum power calculations for AR7552 per wireless technology are shown in Table 4 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 UMTS 824-849 25.7 0.37 5.0 1.000 30.70 1.175 28.56 0.718 7 W ERP AR7552 module(Standalone) UMTS 1850-1910 25.7 0.37 5.0 1.000 30.70 1.175 28.56 0.718 2 W EIRP LTE 1850 - 1910 25.0 0.32 5.0 1.000 30.00 1.000 27.86 0.611 2 W EIRP LTE 1710 - 1755 25.0 0.32 5.0 1.000 30.00 1.000 27.86 0.611 1 W EIRP LTE 824 - 849 25.0 0.32 5.0 1.000 30.00 1.000 27.86 0.611 7 W ERP LTE 2500 - 2570 25.7 0.37 7.0 1.000 32.70 1.862 30.56 1.138 2 W EIRP LTE 704 - 716 25.0 0.32 5.0 1.000 30.00 1.000 27.86 0.611 7 W ERP Table 4: AR7552 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 5. For frequency dependent limit, the lowest transmitter frequency was used to represent 2 the lowest MPE limit in this analysis (eg. 824MHz = 0.549mW/cm ) 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 25.7 0.37 5.0 1.000 30.70 1175 0.234 0.549 AR7552 module(Standalone) UMTS 1850-1910 25.7 0.37 5.0 1.000 30.70 1175 0.234 1.000 LTE 1850 - 1910 25.0 0.32 5.0 1.000 30.00 1000 0.199 1.000 LTE 1710 - 1755 25.0 0.32 5.0 1.000 30.00 1000 0.199 1.000 LTE 824 - 849 25.0 0.32 5.0 1.000 30.00 1000 0.299 0.549 LTE 2500 - 2570 25.7 0.37 7.0 1.000 32.70 1862 0.370 1.000 LTE 704 - 716 25.0 0.32 5.0 1.000 30.00 1000 0.199 0.469 Table 5: AR7552 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 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 25.7 0.37 5.0 1.000 30.70 1175 0.234 0.549 AR7552 module (Collocated) UMTS 1850-1910 25.7 0.37 5.0 1.000 30.70 1175 0.234 1.000 LTE 1850 - 1910 25.0 0.32 5.0 1.000 30.00 1000 0.199 1.000 LTE 1710 - 1755 25.0 0.32 5.0 1.000 30.00 1000 0.199 1.000 LTE 824 - 849 25.0 0.32 5.0 1.000 30.00 1000 0.199 0.549 LTE 2500 - 2570 25.7 0.37 7.0 1.000 32.70 1862 0.370 1.000 LTE 704 - 716 25.0 0.32 5.0 1.000 30.00 1000 0.199 0.469 WLAN 2400 -2500 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 2511.886 Other Collocated WLAN 5150 -5850 29.0 0.794 5.0 1.000 34.00 0.500 1.000 Transmitters WiMax 2300 -2400 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 WiMax 2500 -2700 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 WiMax 3300 -3800 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 BT 2400 -2500 15.0 0.032 5.0 1.000 20.00 100.000 0.020 1.000 Table 6: AR7552 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 Pd WLAN/WiMAX + BT Pd (mW/cm^2) Limit Band (GHz) (mW/cm^2) 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 7: (WLAN or WiMAX) + BT Collocated MPE Calculation WLAN / WLAN / (WLAN / (850 MHz FCC MPE 850 MHz FCC MPE (WWAN 850 WiMAX WiMAX + WiMAX + BT WWAN + WLAN Limit WWAN Pd Limit MHz) / MPE Limit Pass/Fail Band BT Pd Pd) / (MPE / WiMAX + BT (mW/cm^2) (mW/cm^2) (mW/cm^2) Limit) (GHz) (mW/cm^2) Limit) fraction) 2.3-2.4 2.4-2.5 2.5-2.7 0.520 1.000 0.520 0.234 0.549 0.426 0.946 1.000 Pass 3.3-3.8 5.15-5.85 Table 8: WWAN 850MHz + WLAN / WiMAX + BT Collocated MPE Calculation WLAN / WLAN / (WLAN / (1900 MHz FCC MPE 1900 MHz FCC MPE (WWAN WiMAX WiMAX + WiMAX + BT WWAN + WLAN Limit WWAN Pd Limit 1900 MHz) / Limit Pass/Fail Band BT Pd Pd) / (MPE / WiMAX + BT (mW/cm^2) (mW/cm^2) (mW/cm^2) MPE Limit) (GHz) (mW/cm^2) Limit) fraction) 2.3-2.4 2.4-2.5 2.5-2.7 0.520 1.000 0.520 0.234 1.000 0.234 0.754 1.000 Pass 3.3-3.8 5.15-5.85 Table 9: WWAN 1900MHz + WLAN / WiMAX + BT Collocated MPE Calculation

FCC WLAN / (WLAN / (2500 MHz WLAN / MPE 2500 MHz FCC MPE (WWAN WiMAX WiMAX + BT WWAN + WLAN WiMAX + BT Limit WWAN Pd Limit 1700 MHz) / Limit Pass/Fail Band Pd) / (MPE / WiMAX + BT Pd (mW/cm^2) (mW/c (mW/cm^2) (mW/cm^2) MPE Limit) (GHz) Limit) fraction) m^2) 2.3-2.4 2.4-2.5 2.5-2.7 0.520 1.000 0.520 0.370 1.000 0.370 0.870 1.000 Pass 3.3-3.8 5.15-5.85 Table 10: WWAN 2500MHz + WLAN / WiMAX + BT Collocated MPE Calculation FCC WLAN / (WLAN / (1700 MHz WLAN / MPE 1700 MHz FCC MPE (WWAN WiMAX WiMAX + BT WWAN + WLAN WiMAX + BT Limit WWAN Pd Limit 1700 MHz) / Limit Pass/Fail Band Pd) / (MPE / WiMAX + BT Pd (mW/cm^2) (mW/c (mW/cm^2) (mW/cm^2) MPE Limit) (GHz) Limit) fraction) m^2) 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 11: WWAN 1700MHz + WLAN / WiMAX + BT Collocated MPE Calculation FCC WLAN / (WLAN / (700 MHz WLAN / MPE 700 MHz FCC MPE (WWAN 700 WiMAX WiMAX + BT WWAN + WLAN WiMAX + BT Limit WWAN Pd Limit MHz) / MPE Limit Pass/Fail Band Pd) / (MPE / WiMAX + BT Pd (mW/cm^2) (mW/c (mW/cm^2) (mW/cm^2) Limit) (GHz) Limit) fraction) m^2) 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 12: WWAN 700MHz + 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 AR7552 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 13 for each given frequency band per wireless technology. Maximum Maximum Antenna Gain (dBi) Technoloty Frequency (MHz) Conducted Power (dBm) Standalone Collocated 824-849 25.7 5.0 5.0 UMTS 1850-1910 25.7 5.0 5.0 1850 -1915 25.0 5.0 5.0 1710 -1755 25.0 5.0 5.0 LTE 824-849 25.0 5.0 5.0 2500-2570 25.7 7.0 7.0 704-716 25.0 5.0 5.0 WLAN 2400 -2500 29.0 5.0 WLAN 5150 -5850 29.0 5.0 Transmitters 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 13: Summary of Maximum Conducted Power and Antenna Gain


Document Created: 2015-06-12 16:11:16
Document Modified: 2015-06-12 16:11:16
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC