IEEE 62704-2a
Average Specific Absorption Rate (SAR) in the Human Body from Wireless Communications Devices, 30 MHz to 6 GHz -- Part 2: Specific Requirements for Finite Difference Time Domain (FDTD) Modelling of Exposure from Vehicle Mounted Antennas Amendment 1
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About This Item
62704-2a is a technical standard for evaluating average specific absorption rate (SAR) in the human body from wireless communications devices operating from 30 MHz to 6 GHz, with specific requirements for finite difference time domain (FDTD) modelling of exposure from vehicle mounted antennas. It helps define how exposure from these systems should be represented and assessed, supporting more consistent engineering decisions and compliance work across communication and transportation applications.
About 62704-2a
This standard focuses on the modelling requirements used to estimate SAR when wireless systems are mounted on vehicles. The amendment addresses FDTD-based exposure analysis, which is commonly used to simulate electromagnetic interaction between antennas, the vehicle environment, and the human body. In the context of communication, networking and broadcast technologies, 62704-2a provides a more structured basis for technical evaluation, helping users apply a consistent method when assessing exposure-related design and test outcomes.
Where is 62704-2a used?
62704-2a is relevant wherever vehicle mounted antennas may create human exposure concerns, including connected vehicles, fleet communication systems, public transport installations, and other mobile platforms using radio equipment in the 30 MHz to 6 GHz range. It is especially useful in engineering workflows that involve electromagnetic modelling, antenna placement studies, and exposure assessment for designs integrated into transportation systems. The standard supports technical teams that need a defined approach for simulation and review.
Importance in practice
In practice, 62704-2a helps improve consistency in how SAR-related exposure from vehicle mounted antennas is modelled and documented. That matters for design control, safety evaluation, and procurement decisions where compliance evidence may be needed. By setting specific requirements for FDTD modelling, the standard can reduce ambiguity in test planning and simulation results, making it easier to compare designs and manage risk during development of wireless systems for vehicles and related infrastructure.
- Average SAR assessment for wireless devices
- 30 MHz to 6 GHz exposure context
- FDTD modelling requirements
- Vehicle mounted antenna applications
- Communication and transportation use cases
- Publication Date: 2025
- Standard Status: Active
- Publisher: IEEE
- Subject: Communication, Networking and Broadcast Technologies; Fields, Waves and Electromagnetics; Transportation
- Official IEEE: Doi link
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