New measurement method of whole body SAR by using wheeler cap method

Abstract

In this paper a new measurement technique for whole body SAR of small phantom is proposed. The method is based on Wheeler cap method. Wheeler cap method is originally used for antenna efficiency measurement. In recent years, mobile phones are widely used. It is considered that a part of the radiated electromagnetic wave by mobile phones is absorbed into the human body. A lot of studies are accomplished about the interaction of the human body and the electromagnetic wave from such a background. The thermal effects are dominant in the microwave frequency region. And the quantity of energy absorption is evaluated by using SAR (Specific Absorption Rate). In order to measure the SAR from electric fields, electric field sensors are used. Optical fiber thermometer or Thermo camera are used to measure the SARs from a temperature rise. However, these methods are needed a huge measurement time to measure whole body SAR. On the other hand, it is necessary to measure the whole body SARs. However, it is not easy to measure the whole body SARs by the conventional technique. In this study, we will use wheeler cap method to measure the whole body SAR. The effectiveness of the method is confirmed by experimentally and numerically.