Summary
Asia-Pacific Microwave Conference
2022
Session Number:WE2-F1
Session:
Number:WE2-F1-2
Bioelectromagnetics: Human Safety and Device Performance Evaluation
Akimasa Hirata,
pp.-
Publication Date:2022/11/29
Online ISSN:2188-5079
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Summary:
For wireless devices used in proximity to human body, two aspects should be considered: human protection from electromagnetic field and performance in the presence of human body. This talk briefly mentioned about these topics, including the research necessity. 1) There exist public concerns about adverse health effects for exposure to electromagnetic fields. To protect human from electromagnetic fields, a two-tier approach has then been applied in our daily life. First, the exposure standards are developed based on the threshold of adverse health effect. The limit of induced physical quantities in human body, such as induced electric field and specific absorption rate (SAR), are derived considering the reduction factor. The safety of the products should be assessed following the method of product standards. The relationship between these two types of standards is explained including recent standardization related to 5G wireless communication system. 2) From late 1990s, the radiation pattern and input impedance of handset antennas have been analyzed in the presence of the human head. Later, optimized performance of such antennas was explored in addition to its compactness. The propagation characteristics of radio waves are analyzed for body area networks. In addition, wearable sensing of vital signs, such as heart rate, respiration, and other physical activities are wirelessly transferred to smartphones for health care application. These aspects are briefly mentioned emphasizing the effect on the human body.