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Masataka OHIRA


Affiliation

Career

Academic Background

Academic Societies

Prizes

Research Areas

  • Antenna theory, design, and measurements; filter theory, design and measurements; and other passive component designs.
    • Research and development of microwave and millimeter-wave filters
    • Research and development of comact antennas, smart antennas, and millimeter-wave antennas
    • Optimization design technique using genetic algorithms
    • Electromagnetic analysis

Keywords

  • Electromagnetic waves
  • Filters, antennas & propagation
  • High frequency, microwave, millimeter-wave
  • Electromagnetic analysis and design
  • Electromagnetic circuit elements

Recent research

  • Circuit synthesis and design of microwave transversal array filter
  • Compact high-performance cutoff waveguide filters
  • Filtering antennas

Research Career

ATR Wave Engineering Laboratories (Apr. 2006 - Mar. 2010)

  • Research and development of 60-GHz-band switched beam antenna for multi-gigabit high-speed wireless loca area network (LAN)
  • Research and development of microwave smart antennas for an efficient spectrum use with space division multiplexing (SDM) technology in 2.4-GHz and 5-GHz wireless local area network
  • Investigation on microwave radio propagation in ICT equipment for next-generation machine-tomachine (M2M) wireless communications
  • Research and development of submillimeter-wave antennas for imaging technologies
  • Research and development of antenna miniaturization for U-VHF bands

Doshisha University (Apr. 2001 - Mar. 2006)

  • Analysis and design of multiband frequency-selective surfaces
  • Analysis and design of FSS-loaded waveguide filters
  • Analysis and design of planar filters
  • Analysis and design of horn antennas
  • Electromagnetic analysis such as the method of moments and mode-matching methods

Conference Proceedings

Workshop

  • M. Ohira, "A parameter-extraction method for transversal resonator array bandpass filters and its applications to multi-mode filter designs," Workshop WS1D in 2014 Asia-Pacific Microwave Conf. (APMC 2014), Sendai, Japan, Nov. 2014.

Tutorial talks

  • M. Ohira, "Genetic Algorithm Design for Applications to Microwave Filters and Antennas," TJMW2012 (Thailand-Japan MicroWave) Microwave Theory and Techniques Tutorial MW-3, pp.87-104, Chulalongkorn University, Bangkok, Thailand, Aug. 2012.
  • H. Kayano and M. Ohira, "Fundamentals of Microwave Filters: Synthesis Theory and Design Techniques," TJMW2013 (Thailand-Japan MicroWave) Short Courses: Tutorial 4, Kasetsart University, Bangkok, Thailand, Dec. 2013.
  • M. Ohira, "Microwave planar bandpass filter design for student design competition," Tutorial Session of 2016 Thailand-Japan MicroWave (TJMW2016), KMUTNB, Bangkok, Thailand, June 2016.

Multiband frequency selective surfaces (FSSs)

Multiband FSSs designed by genetic algorithm

2.45GHz-band 5th-order microstrip filtering antenna (filtenna)

Fully canonical Cul-de-Sac coupling bandpass filter at 2GHz band

Fully canonical transversal resonator array bandpass filter at 2GHz band

Dual-mode resonator filter at 2GHz band

Three-mode resonator filter at 5GHz band

Four-mode resonator filter at 5GHz band

X-band compact waveguide filter


X-band compact waveguide filter designed by genetic algorithm


X-band compact waveguide filter


X-band compact cutoff waveguide filter


60GHz-band sector-switched antenna for wireless LAN

2.4GHz-band multiport parasitic array radiator (MuPAR) antenna

430MHz electrically small monopole antenna

X-band elliptic-beam horn antenna

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