Toshiyasu Tanaka

Lightweight tissue-equivalent phantom for evaluation of antenna performances

A lightweight phantom is made by a plastic shell with a shape of the human head and it has a cavity inside. The cavity is filled entirely or partially with the absorbers. In the next section, we evaluate the characteristics of the phantom with a dipole antenna near a COST244 spherical model imitating the human head. The radiation patterns are measured in experiment, and the phantom is compared with the real human head. The paper investigates the shape of the human head model to improve accuracy of simulation.

Simplified Local Specific Absorption Rate Measurement Method Using Lightweight Phantom Composed of Wave Absorber Embedded of Electric Field Probe

In this paper, a simplified local SAR measurement method is developed. A lightweight phantom composed of wave absorber embedded of electric field probe is designed. The relative permittivity and conductivity of wave absorber is determined in order to equalize the surface electric field of the wave absorber and the standard liquid phantom. For this purpose, it is suitable to equalize the amplitude of the surface impedances of the two cases. The internal electric field is estimated with the estimated penetration depth. The peak spatial-average SAR of an inverted F-antenna mounted on a metal plate using the proposed measurement method is almost identical to the analytical result of the liquid phantom. The error of the proposed measurement method is within the allowable limits including measurement error.

Bandwidth broadening of shielding effectiveness measurement by KEC method

This paper presents a bandwidth broadening of KEC (Kansei Electronic Industry Development Center) method. Proposed instrument is made up of double ridge horn antenna surrounded by absorber wall and test sample. It increases bandwidth in KEC method to 1~13GHz. In order to discuss the feasibility of proposed instrument, we simulated two kinds of materials and compared simulation value with theoretical value.

Ultra Light Carbon Phantom hand for RF performance evaluation of mobile terminals

Measurement of radio frequency (RF) radiation performance has been investigated for mobile terminals including the influence of the human body. Recent studies have shown that the users hand has a greater influence on antenna radiation performance than the head. Therefore, a hand phantom needs to be included in the evaluation of the RF performance of a mobile terminal. We developed a lightweight tissue-equivalent phantom, Ultra Light Carbon Phantom (ULCP®), consisting of a head and upper body, for application to three-dimensional (3-D) RF radiation measurement. In this paper, the development and evaluations of the hand of the ULCP is presented. The RF performances of a dipole antenna and a mobile terminal with the ULCP hand are evaluated in comparison with a number of human test subjects. Finally, it is confirmed that the ULCP hand is useful for mobile terminal tests including the influence of the human hand.