RF exposure evaluation

FCC ID: V7TAC7

RF Exposure Info

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FCCID_3842495

FCC RF EXPOSURE EVALUATION REPORT FCC ID: V7TMESH3F Project No. : 1804C050 Equipment : AC1200 Smart Dual‐Band WiFi Router Model : AC7 Applicant : SHENZHEN TENDA TECHNOLOGY CO., LTD. Address : 6‐8 Floor, Tower E3, No. 1001, Zhongshanyuan Road, Nanshan District, Shenzhen, China Exposure category : General population/uncontrolled environment EUT Type: : Production Unit (Engineer Sample) Device Type : Mobile Device

1. Evaluation Method Systems operating under the provisions of FCC 47 CFR section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as mobile device whereby a distance of 0.2m normally can be maintained between the user and the device, and below RF Permissible Exposure limit shall comply with. In accordance with KDB447498D01 for 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 MPE ratio of each antenna is determined at the minimum test separation distance required by the operating configurations and exposure conditions of the host device, according to the ratio of field strengths or power density to MPE limit, at the test frequency. Either the maximum peak or spatially averaged results from measurements or numerical simulations may be used to determine the MPE ratios. Spatial averaging does not apply when MPE is estimated using simple calculations based on far‐ field plane‐wave equivalent conditions. The antenna installation and operating requirements for the host device must meet the minimum test separation distances required by all antennas, in both standalone and simultaneous transmission operations, to satisfy compliance. 2. Limits for General Population/Uncontrolled Exposure 3. Refer Evaluation Method ANSI C95.1–1999: IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. FCC KDB publication 447498 D01 General RF Exposure Guidance v06: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies. FCC CFR 47 part1 1.1310: Radiofrequency radiation exposure limits. FCC CFR 47 part2 2.1093: Radiofrequency radiation exposure evaluation: portable devices

4. Calculation Method Predication of MPE limit at a given distance Equation from page 18 of OET Bulletin 65, Edition 97‐01 S=PG/4πR² Where: S=power density P=power input to antenna G=power gain of the antenna in the direction of interest relative to an isotropic radiator R=distance to the center of radiation of the antenna 5. Conducted Power Results 5.1 Test Setup 5.2 Test Equipment Item Kind of Equipment Manufacturer Type No. Serial No. Calibrated until 1 Power Meter ANRITSU ML2495A 1128009 Mar.11, 2019 2 Pulse Power Sensor ANRITSU MA2411B 1027500 Mar.11, 2019 Remark: all calibration period of equipment list is one year. 5.3 Test Procedure a. The EUT was directly connected to the power meter and antenna output port as show in the block diagram Test Setup. b. Setup EUT work at duty cycle more than 98%; c. Read power sensor values in RMS detector; 5.4 Test Results and Manufacturing Tolerance

Maximum power declared by Manufacturer Frequency Band Antenna 1 Antenna 2 IEEE 802.11b 2.4G ≤ 24.00 ≤ 24.00 IEEE 802.11g 2.4G ≤ 27.50 ≤ 27.50 IEEE 802.11n HT20 2.4G ≤ 25.00 ≤ 25.00 IEEE 802.11n HT40 2.4G ≤25.00 ≤ 25.00 5G Band 1 ≤26.50 ≤26.50 IEEE 802.11a 5G Band 3 ≤28.00 ≤28.00 5G Band 1 ≤25.00 ≤24.50 IEEE 802.11n HT20 5G Band 3 ≤25.00 ≤25.50 5G Band 1 ≤25.00 ≤24.50 IEEE 802.11n HT40 5G Band 3 ≤24.50 ≤24.50 5G Band 1 ≤ 25.00 ≤24.50 IEEE 802.11ac VHT20 5G Band 3 ≤ 24.50 ≤25.00 5G Band 1 ≤ 24.50 ≤25.00 IEEE 802.11ac VHT40 5G Band 3 ≤ 25.00 ≤ 25.00 5G Band 1 ≤19.50 ≤ 18.50 IEEE 802.11ac VHT80 5G Band 3 ≤ 24.00 ≤ 24.50 6. Antenna Information Maximum Peak Gain Antenna Manufacturer Model Name Antenna Type Connector (dBi) Antenna 1 N/A N/A Dipole N/A 5 Antenna 2 N/A N/A Dipole N/A 5 Antenna 3 N/A N/A Dipole N/A 5 Antenna 4 N/A N/A Dipole N/A 5 7. Evaluation Results 7.1 Standalone Antenna1 Antenna Antenna Output power Duty MPE MPE Limits Mode Gain Gain Cycle (mW/cm2) (mW/cm2) (dBm) (mW) (dBi) (linear) IEEE 802.11b 24.00 251.1886 5 3.1623 100% 0.1581 1.0000 IEEE 802.11g 27.50 562.3413 5 3.1623 100% 0.3540 1.0000 IEEE 802.11n HT20 25.00 316.2278 5 3.1623 100% 0.1990 1.0000 IEEE 802.11n HT40 25.00 316.2278 5 3.1623 100% 0.1990 1.0000

Antenna 2 Antenna Antenna Output power Duty MPE MPE Limits Mode Gain Gain Cycle (mW/cm2) (mW/cm2) (dBm) (mW) (dBi) (linear) IEEE 802.11b 24.00 251.1886 5 3.1623 100% 0.1581 1.0000 IEEE 802.11g 27.50 562.3413 5 3.1623 100% 0.3540 1.0000 IEEE 802.11n HT20 25.00 316.2278 5 3.1623 100% 0.1990 1.0000 IEEE 802.11n HT40 25.00 316.2278 5 3.1623 100% 0.1990 1.0000 Antenna 3 Antenna Antenna Output power Duty MPE MPE Limits Mode Gain Gain Cycle (mW/cm2) (mW/cm2) (dBm) (mW) (dBi) (linear) IEEE 802.11a 28.00 630.9573 5 3.1623 100% 0.3971 1.0000 IEEE 802.11n HT20 25.00 316.2278 5 3.1623 100% 0.1990 1.0000 IEEE 802.11n HT40 25.00 316.2278 5 3.1623 100% 0.1990 1.0000 IEEE 802.11ac VHT20 25.00 316.2278 5 3.1623 100% 0.1990 1.0000 IEEE 802.11ac VHT40 25.00 251.1886 5 3.1623 100% 0.1581 1.0000 IEEE 802.11ac VHT80 24.00 630.9573 5 3.1623 100% 0.3971 1.0000 Antenna 4 Antenna Antenna Output power Duty MPE MPE Limits Mode Gain Gain Cycle (mW/cm2) (mW/cm2) (dBm) (mW) (dBi) (linear) IEEE 802.11a 28.00 630.9573 5 3.1623 100% 0.3971 1.0000 IEEE 802.11n HT20 25.50 354.8134 5 3.1623 100% 0.2233 1.0000 IEEE 802.11n HT40 24.50 281.8383 5 3.1623 100% 0.1774 1.0000 IEEE 802.11ac VHT20 25.00 316.2278 5 3.1623 100% 0.1990 1.0000 IEEE 802.11ac VHT40 25.00 316.2278 5 3.1623 100% 0.1990 1.0000 IEEE 802.11ac VHT80 24.50 281.8383 5 3.1623 100% 0.1774 1.0000 Remark: 1. Maximum power including tune‐up tolerance; 2. EIRP including tune‐up tolerance; 3. MPE use distance is 20 cm from manufacturer declaration of user manual. 7.2 Simultaneous Transmission for SAR Exclusion The sample support two WLAN modular, 2T2R MIMO antennas for 2.GHz and 2T2R MIMO for 5GHz, 2.4GHz and 5GHz share difference antennas, need consider simultaneous transmission;

Antenna 1 and Antenna 2 for 2.4GWLAN MPE Ratio MPE Ratio ∑ MPE Band Mode Limit Results Antenna 1 Antenna 2 ratios IEEE 802.11b 0.1581 0.1581 ‐/‐ 1.0 PASS IEEE 802.11g 0.3540 0.3540 ‐/‐ 1.0 PASS 2G IEEE 802.11n HT20 0.1990 0.1990 < 0.4 1.0 PASS IEEE 802.11n HT40 0.1990 0.1990 < 0.4 1.0 PASS MPE Ratio MPE Ratio ∑ MPE Band Mode Limit Results Antenna 1 Antenna 2 ratios IEEE 802.11a 0.3971 0.3971 ‐/‐ 1.0 PASS IEEE 802.11n HT20 0.1990 0.2233 < 0.5 1.0 PASS 5G IEEE 802.11n HT40 0.1990 0.1774 < 0.4 1.0 PASS IEEE 802.11ac VHT20 0.1990 0.1990 < 0.4 1.0 PASS IEEE 802.11ac VHT40 0.1581 0.1990 < 0.4 1.0 PASS IEEE 802.11ac VHT80 0.3971 0.1774 < 0.6 1.0 PASS Maximum MPE Ratios for dual‐mode WLAN simultaneous transmission Maximum MPE Maximum MPE ∑ MPE ratios Limit Results Ratio 2.4GWLAN Ratio 5GWLAN 0.3980 0.5745 1.0 1.0 PASS Remark: 1. Maximum power including tune‐up tolerance; 2. EIRP including tune‐up tolerance; 3. MPE use distance is 20cm from manufacturer declaration of user manual. 8. Conclusion The measurement results comply with the FCC Limit per 47 CFR 2.1093 for the uncontrolled RF Exposure and SAR Exclusion Threshold per KDB 447498 v06.


Document Created: 2018-05-04 10:12:41
Document Modified: 2018-05-04 10:12:41
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