Masataka Ohira

J-GLOBAL         Last updated: Jun 12, 2019 at 12:13
Masataka Ohira
Saitama University
Graduate School of Science and Engineering
Job title
Associate Professor
Dr. of Eng.(Doshisha University)

Research Areas


Academic & Professional Experience

Apr 2014
Associate Professor, Saitama University
Jul 2011
Mar 2013
Visiting Researcher, ATR
Jun 2010
Mar 2011
Visiting Researcher, ATR Wave Engineering Laboratories
Apr 2010
Mar 2014
Assistant Professor, Saitama University
Apr 2006
Mar 2010
Researcher, ATR Wave Engineering Laboratories


Apr 2003
Mar 2006
Graduate School of Engineering, Dr., Doshisha University
Apr 2001
Mar 2003
Graduate School of Engineering, Doshisha University
Apr 1997
Mar 2001
Department of Electronics, Faculty of Engineering, Doshisha University

Awards & Honors

Jun 2018
Best Paper Award, IEICE
Winner: R. Hamano, Z. Ma, and M. Ohira
Dec 2014
IEEE MTT-S Japan Young Engineer Award
Dec 2014
Michiyuki Uenohara Memorial Award
Dec 2012
IEEE AP-S Japan Chapter Young Engineer Award
Apr 2011
Microwave Prize, CJMW2011 (China-Japan Microwave Conference)

Published Papers

Compact multi-band differential bandpass filters using microstrip multi-moderesonators
B. Ren, Z. Ma, H. Liu, X. Guan, P. Wen, and M. Ohira
Proc. of IEEE MTT-S Int. Wireless Symp.      May 2019   [Refereed]
P. Wen, Z. Ma, H. Liu, S.Zhu, B. Ren, X. Guan, and M. Ohira
IEICE Electronics Express   16(7) 1-5   Mar 2019   [Refereed]
In this paper, a compact dual-band bandpass (DB-BPF) with multiple transmission zeros and wide stopband is developed. The DB-BPF consists of a pair of open-ended stub-loaded short-circuited stepped-impedance resonators with easy control of their t...
P. Wen, Z. Ma, S. Zhu, B. Ren, Y. Song, X. Wang, and M. Ohira
IEEE Microwave and Wireless Comp. Lett.   29(2) 101-103   Feb 2019   [Refereed]
In this letter, a novel compact dual-band filtering power divider (DB-FPD) is proposed. It consists of a U-shaped Wilkinson power divider, two pairs of dual-resonance resonators (DRRs), and a pair of spur lines. With the simultaneous use and appro...
M. Ohira, S. Hashimoto, Z. Ma, and X. Wang
IEEE Trans. on Microwave Theory and Tech.   67(1) 118-128   Jan 2019   [Refereed]
This paper presents a systematic design procedure of microstrip higher order tunable bandpass filters (BPFs) that can realize a constant absolute frequency bandwidth (ABW) and transmission zeros (TZs) with the minimum number of varactors and a sin...
X. Wang, N. Shinoda, Z. Ma, and M. Ohira
AEU - International Journal of Electronics and Communications   98 259-264   Jan 2019   [Refereed]
A tunable transmission-line transformer (TLT) is newly introduced in this paper. It consists of two transmission lines (TLs), one parallel varactor and one series varactor. The design formulas are newly derived in closed-form, and its design proce...


桂馬 康輔, 馬 哲旺, 大平 昌敬
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   118(403) 85-90   Jan 2019
山下 青, 大平 昌敬, 馬 哲旺
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   118(506) 121-126   Mar 2019
橋本 周磨, 大平 昌敬, 馬 哲旺
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   118(403) 91-96   Jan 2019
山下 青, 大平 昌敬, 馬 哲旺
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   118(507) 121-126   Mar 2019
相馬 朝康, 大平 昌敬, 馬 哲旺
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   118(403) 97-102   Jan 2019

Conference Activities & Talks

Masataka Ohira
Global Symposium on Millimeter Waves (GSMM) 2019   24 May 2019   
A neural-network (NN) based microwave passive/active circuit design is one of promising approaches for automation of complicated and time-consuming design tasks. In bandpass filter designs, for example, a main difficulty is a tuning process that r...
Microwave planar bandpass filter design for student design competition
M. Ohira
Tutorial Session of 2016 Thailand-Japan MicroWave (TJMW2016)   11 Jun 2016   
Masataka Ohira
Microwave Workshops & Exhibition (MWE 2015)   25 Nov 2015   
Masataka Ohira
2014 Asia-Pacific Microwave Conference (APMC 2014)   4 Nov 2014   IEICE
Fundamentals of Microwave Filters: Synthesis Theory and Design Techniques [Invited]
H. Kayano and M. Ohira
TJMW 2013 Tutorial Session   2 Dec 2013   


Noriaki Kuwahara, Tsutomu Miyasato, Noriaki MITSUNAGA, Rieko Kadobayashi, Masataka Ohira
echnologies are generally described for identification of recorded image data. In various examples, a mobile device may include a receiver, a memory and a processor. The receiver may be configured to receive a signal transmission from a surveillan...
Rieko Kadobayashi, Tsutomu Miyasato, Noriaki Kuwahara, Masataka Ohira, Noriaki Mitsunaga
Technologies are generally described for an automated external defibrillator (AED) dispatch system. In various examples, the AED dispatch system may include a receiver, a vehicle determination unit, and a transmitter. The receiver may be configure...
大平 昌敬, 馬場 隆行, 太郎丸 眞, 岡田 広毅, 岸 孝彦, 中尾 文章, 中野 万作
大平 昌敬, 馬場 隆行, 太郎丸 眞, 岡田 広毅, 岸 孝彦, 中尾 文章, 中野 万作
大平 昌敬, 馬場 隆行, 北沢 祥一, 伴 弘司, 上羽 正純