Takashi Ohira

Takashi Ohira received B.E. and D.E. degrees in communication engineering from Osaka University, Osaka, Japan, in 1978 and 1983. In 1983, he joined NTT Electrical Communication Laboratories, Yokosuka, Japan, where he was engaged in research on monolithic integration of microwave semiconductor devices and circuits. He developed GaAs MMIC transponder modules and microwave beamforming networks aboard multi-beam communication satellites, Engineering Test Satellite VI (ETS-VI) and ETS-VIII, at NTT Wireless Systems Laboratories, Yokosuka, Japan. From 1999, he was engaged in research on wireless adhoc networks and microwave analog adaptive antennas at ATR Adaptive Communications Research Laboratories, Kyoto, Japan. Concurrently he was a Consulting Engineer for National Space Development Agency (NASDA) ETS-VIII Project in 1999, and an Invited Lecturer for Osaka University in 2000 to 2001. From 2005, he was Director of ATR Wave Engineering Laboratories, Kyoto, Japan, and an Invited Professor of Tokyo Institute of Technology, Tokyo, Japan. Currently he is a Professor of Toyohashi University of Technology, Toyohashi, Japan. He serves as URSI Commission C Vice Chair, APMC2006 International Steering Committee Chair, EuMA Award Committee member, and EuMC2006 Technical Program Committee member. He is an IEEE Fellow. He co-authored Monolithic Microwave Integrated Circuits (Tokyo: IEICE, 1997). Dr. Ohira was awarded 1986 IEICE Shinohara Prize, 1998 APMC Japan Microwave Prize, and 2004 IEICE Electronics Society Prize.

Publications

Omni-, Sector, and Adaptive Modes of Compact Array Antenna
Omni-, Sector, and Adaptive Modes of Compact Array Antenna
Jun Cheng, Eddy Taillefer, Takashi Ohira. © 2010. 13 pages.
Three working modes, omni-, sector and adaptive modes, for a compact array antenna are introduced. The compact array antenna is an electronically steerable parasitic array...
Handbook on Advancements in Smart Antenna Technologies for Wireless Networks
Handbook on Advancements in Smart Antenna Technologies for Wireless Networks
Chen Sun, Jun Cheng, Takashi Ohira. © 2009. 584 pages.
The dramatic growth of the wireless communication industry growth has resulted in searches for new technologies to provide broader bandwidth per user channel, better quality, and...
Fast Beamforming of Compact Array Antenna
Fast Beamforming of Compact Array Antenna
Chen Sun, Takashi Ohira, Makoto Taromaru, Nemai Chandra Karmakar, Akifumi Hirata. © 2009. 18 pages.
In this chapter, we describe a compact array antenna. Beamforming is achieved by tuning the load reactances at parasitic elements surrounding the active central element. The...
Direction of Arrival Estimation with Compact Array Antennas: A Reactance Switching Approach
Direction of Arrival Estimation with Compact Array Antennas: A Reactance Switching Approach
Eddy Taillefer, Jun Cheng, Takashi Ohira. © 2009. 16 pages.
This chapter presents direction of arrival (DoA) estimation with a compact array antenna using methods based on reactance switching. The compact array is the single-port...
Omni-, Sector, and Adaptive Modes of Compact Array Antenna
Omni-, Sector, and Adaptive Modes of Compact Array Antenna
Jun Cheng, Eddy Taillefer, Takashi Ohira. © 2009. 13 pages.
Three working modes, omni-, sector and adaptive modes, for a compact array antenna are introduced. The compact array antenna is an electronically steerable parasitic array...