Naoto Kogo

Effect of human body on antenna performance of transceiver for push-to-talk communication line in VHF and UHF bands

The antenna performance of a transceiver located in front of the human head was investigated with the main interest in the dependency on frequencies and the location of the antenna. We used a numerical approach for the investigation. We designed a helical antenna with a metallic case as a handheld type transceiver and calculated the radiation patterns of the antenna with a numerical human-body model. Moreover, the specific absorption rate (SAR) in a human body exposed to electromagnetic waves from the antenna is shown.

Folded Type Rectangular Loop Antenna in UHF Band

In this paper, we proposed a Folded type Rectangular Loop Antenna (FRLA) for one-seg. The measurement and simulation results indicated that the characteristics of the radiation patterns are similar to a rectangular loop antenna with full wavelength wire and resonates in the lower UHF band. The measured gain of the FRLA is -2.8dBi and the simulated gain is -2.2dBi. In the future, we will study configurations to achieve more wideband characteristics, and improvement of its radiation efficiency.