FCC SAR Testing & Radio Frequency Exposure 1 — Questions and Answers
Question 1: What does SAR stand for in the context of FCC device testing?
- Signal Absorption Rating
- Specific Absorption Rate (Correct answer)
- Spectral Analysis Reading
- Standard Attenuation Ratio
Correct answer: Specific Absorption Rate
SAR (Specific Absorption Rate) is the rate at which energy is absorbed by the human body when exposed to a radio frequency electromagnetic field.
Question 2: What is the FCC's general population SAR limit for mobile phones operated near the head?
- 0.8 W/kg averaged over 1 gram
- 1.6 W/kg averaged over 1 gram (Correct answer)
- 2.0 W/kg averaged over 10 grams
- 4.0 W/kg averaged over 10 grams
Correct answer: 1.6 W/kg averaged over 1 gram
FCC 47 CFR Part 2.1093 sets the SAR limit at 1.6 W/kg averaged over any 1 gram of tissue for the general population/uncontrolled exposure category.
Question 3: Over what mass of tissue is the FCC SAR limit for the head and trunk spatially averaged?
- 0.1 gram
- 1 gram (Correct answer)
- 10 grams
- 100 grams
Correct answer: 1 gram
The FCC SAR limit of 1.6 W/kg is averaged over any 1 gram of tissue in the shape of a cube, as specified in 47 CFR Part 2.1093.
Question 4: Which IEEE standard specifies the measurement procedures for SAR of wireless mobile handsets?
- IEEE 1528 (Correct answer)
- IEEE 802.11
- IEEE 287
- IEEE 1451
Correct answer: IEEE 1528
IEEE 1528 (Recommended Practice for Determining the Peak Spatial-Average SAR in the Human Head from Wireless Communications Devices) defines SAR measurement procedures for mobile handsets.
Question 5: What is the primary purpose of the homogeneous liquid filling the head phantom in SAR testing?
- To cool the measurement probe during scanning
- To simulate the average dielectric properties of human head tissue (Correct answer)
- To prevent electrical discharge inside the phantom shell
- To maintain thermal stability of the robotic arm
Correct answer: To simulate the average dielectric properties of human head tissue
The tissue-simulating liquid is formulated to match the dielectric properties (permittivity and conductivity) of human head tissue at the test frequency, enabling accurate SAR measurements.
Question 6: Which FCC bulletin provides detailed guidance for evaluating RF exposure compliance for wireless devices?
- OET Bulletin 62
- OET Bulletin 65 (Correct answer)
- OET Bulletin 70
- OET Bulletin 55
Correct answer: OET Bulletin 65
FCC OET Bulletin 65 (Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields) is the primary reference document for RF exposure compliance evaluation.
Question 7: For which frequency range does the FCC require SAR evaluation for portable devices operated near the body?
- Below 100 kHz
- 100 kHz to 6 GHz (Correct answer)
- 6 GHz to 30 GHz
- Above 30 GHz
Correct answer: 100 kHz to 6 GHz
The FCC requires SAR evaluation for portable transmitting devices operating from 100 kHz to 6 GHz, as specified in 47 CFR Part 2.1093 and OET Bulletin 65.
FCC SAR Testing & Radio Frequency Exposure 1
What does SAR stand for in the context of FCC device testing?