Real-Time SAR Measurement System Using the RFID

As the development of information-oriented society, the importance of wireless communication technology have been raised. And the increase of mobile handset usage has been encouraging the study on whether microwave is harm on the body or not. Particularly, SAR(Specific Absorption Rate) for human head is vigorously studied, because the transmit power of mobile handset effects on the head directly. Fig. 1 represents the currently applied method in which a sham human body and the probe is used for SAR measurement. In this method, a sham human filled with homogeneous permeability material inside is measured using small dipole antenna probe installed. However, there is the problem of measurement time-consuming caused by mechanical 3-dimension scanning. Also, the problem such as non-exact structure of sham body and the permeability assumption is raised. Therefore, in this paper, real-time SAR measurement system using the RFID(Radio Frequency Identification)[1] is proposed instead of mechanical measurement. The micro-antenna with 3-axis polarization which is essential element for proposed system is designed and fabricated, and its characteristic described.