Yasuhiro Nishioka
Mitsubishi Electric
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Publication
Featured researches published by Yasuhiro Nishioka.
topical conference on antennas and propagation in wireless communications | 2017
Hiroaki Sakamoto; Takashi Yanagi; Yasuhiro Nishioka; Toru Fukasawa; Hiroaki Miyashita
This paper proposes a broadband circularly polarized antenna that is composed of inverted F and L antennas on the ground plane, and is allocated in a rotational symmetry. The height and diameter of our proposed antenna is respectively 0.10λ<inf>0</inf> and 0.33λ<inf>0</inf>. The relative bandwidth satisfied with VSWR<3 in each band is 10.7% and 6.9%.
usnc-ursi radio science meeting | 2016
Tai Tanaka; Yoshio Inasawa; Yasuhiro Nishioka; Hiroaki Miyashita
In this paper, we evaluate the fast far-field approximation (FaFFA) for the characteristic basis function method (CBFM). By adopting the FaFFA to the CBFM, impedance matrix calculation time can be accelerated. We calculate the radar cross section of the conductor plate with the use of FaFFA-CBFM, and compare the results with ordinary-CBFM. Both results are in good agreement, and FaFFA-CBFM is faster than the conventional method.
international conference on electromagnetics in advanced applications | 2016
Tai Tanaka; Yoshio Inasawa; Yasuhiro Nishioka; Hiroaki Miyashita
In this paper, we evaluated the hierarchical generation technique of characteristic basis function combined with singular value decomposition (SVD). This method enables us to analyze a scattering field with a high accuracy with small-scale matrix. By calculating the radar cross section (RCS) of a large conductor cylinder, we evaluated the technique. The solutions of proposed and conventional method correspond well; thus, the effectiveness was verified.
international conference on electromagnetics in advanced applications | 2015
Tai Tanaka; Yoshio Inasawa; Yasuhiro Nishioka; Hiroaki Miyashita
In this paper, we proposed Improved Primary Characteristic Basis Function Method (IP-CBFM). This method enables us to analyze a scattering field in a specific coordinate plane with a high accuracy with small-scale matrix equations. IP-CBF is the combined CBF of Primary and Secondary CBF. By calculating the Radar Cross Section (RCS) of a perfect electric conductor plate, we evaluated the technique. The solutions of proposed and conventional method correspond well.
topical conference on antennas and propagation in wireless communications | 2014
Yasuhiro Nishioka; K. Hitomi; H. Okegawa; Tomohiro Mizuno; Toru Fukasawa; Hiroaki Miyashita; Y. Iida
The demand for RFID tags that can be read by both HF and UHF RFID systems has been rapidly increasing. In this paper, we propose a novel HF/UHF dual-band tag antenna configuration that utilizes an HF coil conductor positively as a UHF antenna conductor. In order to control UHF current flowing on the coil and to achieve high radiation efficiency, the coil windings are coupled capacitively. The inductively coupled feed technique is adopted to obtain wider impedance bandwidth. It is shown by numerical electro-magnetic simulation that the fractional bandwidth of the actual gain of more than 1 dBi and 0 dBi are approximately 11% and 16%, respectively. The readable ranges of the prototype tag are 8-m and more than 10-cm in the UHF and HF, respectively.
international conference on electromagnetics in advanced applications | 2014
Tai Tanaka; Yasuhiro Nishioka; Yoshio Inasawa; Hiroaki Miyashita
In this paper, we verified the Poggio, Miller, Chang, Harrington, Wu and Tsai - Characteristic Basis Function Method (PMCHWT-CBFM) by applying the extended version of the CBFM for analyzing the radar cross section (RCS) of the array antenna. The method can be reduced memory usage of calculation compared with those of the direct MoM.
Archive | 2007
Hirokatsu Okegawa; Takanori Miyamae; Masataka Ohtsuka; Yasuhiro Nishioka; Toru Fukasawa; Osamu Murakami; Takashi Nakatani; Masashi Kawanami
Archive | 2002
Hideaki Shoji; Yasuhito Imanishi; Toru Fukasawa; Yasuhiro Nishioka
IEICE Transactions on Electronics | 2016
Tai Tanaka; Yoshio Inasawa; Yasuhiro Nishioka; Hiroaki Miyashita
european conference on antennas and propagation | 2010
Yasuhiro Nishioka; K. Hitomi; H. Okegawa; Tomohiro Mizuno; Toru Fukasawa; Hiroaki Miyashita; Yoshihiko Konishi