Acoustic Yagi-Uda antenna using resonance tubes

Yuki Tamura, Kohei Yatabe, Yasuhiro Ouchi, Yasuhiro Oikawa, Yoshio Yamasaki

研究成果: Conference contribution

抄録

A Yagi-Uda antenna gets high directivity by applying current phase shift between elements due to resonance phenomena. It has some directors and reflectors, which are elements without electric supply. The length of directors is shorter than half-wave and that of reflectors is longer than half-wave. We proposed an acoustic Yagi-Uda antenna which elements are resonance tubes and a loudspeaker. The aim of this research is to im- prove directivity in a specific frequency. This can be applied to Radio Acoustic Sounding System (RASS), which is a kind of radar for weather observation, or to a parametric loudspeaker. The phase shift of sound waves was observed in the condition with a resonance tube and without the tube at the same position. That shift changes suddenly around the resonance frequency of the tube. Our acoustic antenna has resonance tubes that have different length as directors and reflectors to apply this phenomenon. Moreover, the distances be- Tween a loudspeaker and tubes were concerned by some experiments and by numerical analysis. The acoustic antenna showed directivity in an appropriate condition of the distances and the frequency of the sound source. It will be also added the consideration about the effective frequency band of this acoustic antenna.

本文言語English
ホスト出版物のタイトルINTERNOISE 2014 - 43rd International Congress on Noise Control Engineering
ホスト出版物のサブタイトルImproving the World Through Noise Control
編集者John Davy, Marion Burgess, Charles Don, Liz Dowsett, Terry McMinn, Norm Broner
出版社Australian Acoustical Society
ISBN(電子版)9780909882037
出版ステータスPublished - 2014 1 1
イベント43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control, INTERNOISE 2014 - Melbourne, Australia
継続期間: 2014 11 162014 11 19

出版物シリーズ

名前INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control

Conference

Conference43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control, INTERNOISE 2014
CountryAustralia
CityMelbourne
Period14/11/1614/11/19

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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