Safe Acceptable Standoff Distances for Body Wearable Antennas
ARMY COMMUNICATIONS-ELECTRONICS RESEARCH DEVELOPMENT AND ENG CTR FT MONMOUTH NJ
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Soldier Manpack radios for programs such as Future Warrior Technology Integration FWTI, Land Warrior LW , and JTRS Handheld Manpack and Small Form Fit HMS use standard whip antennas which can be as large as a meter in height. During combat operations, the whip antenna can become entangled, damaged or destroyed, causing a degradation or loss of communications. In addition to the antennas size, whip antennas present electrical challenges in that they are vertically polarized and narrowband. When Soldiers are kneeling or prone to the ground, the efficiency strength of communications between nodes may be reduced due to the polarization mismatch between antennas. Finally, the narrowband design of the whip antenna cannot support the newer generation of wideband waveforms. Body Wearable Antennas BWA can mitigate these deficiencies and increase the Soldiers communication capabilities. Recent concerns about the RF Radiation Hazards of BWA have arisen in both the commercial and military communities. Since a BWA is in close proximity to the Soldiers body, there is a concern that the RF exposure creates a potentially unsafe Electromagnetic Hotspot. The US Army Center for Health Promotion and Preventative Medicine CHPPM requires a fully certified RF Safety Assessment of BWAs before they are worn by Soldiers. The Department of Defense uses DoDI 6055.11 and IEEE C95.1-199211999 Standard for Safety Levels with Respect to Human Exposure to RF Electromagnetic Fields, 3 kHz to 300 GHz as the basis for the assessment. Within these standards, the levels of these RF exposures are quantified using the Specific Absorption Rate SAR , which is a measure of the ratewhich is a measure of the rate at which radio frequency is absorbed by the body when exposed to radiofrequency electromagnetic field. In this paper, acceptable stand-off distances between the BWA and the Soldiers body are identified using the SAR parameter as a metric to measure RF exposure to human tissue.
- Electrical and Electronic Equipment
- Military Forces and Organizations
- Radio Communications