A multimode tunable spherical wheeler cap for broadband antenna efficiency measurements

Yuji Tanabe, Tomoki Uwano, Takaaki Baba

研究成果: Article査読

2 被引用数 (Scopus)

抄録

This paper proposes a simple technique for measuring the radiation efficiency of broadband antennas by using a tunable spherical Wheeler cap made of brass with an inner diameter of 70 mm. The proposed method utilizes a multimode tuner designed as an adjustable brass stub with a ring to compensate the undesirable reductions of the measured efficiency caused by both TM and TE mode resonances of the cap. The required tuning levels for minimizing the undesirable reduction will depend on the Q factors of the cap resonances. The experimental results of a UWB slot antenna, performed at the frequency range of 3 to 10 GHz, show that the efficiency reduction can be minimized by enveloping over all maxima of efficiency curves measured for five different tuner positions.

本文言語English
ページ(範囲)487-492
ページ数6
ジャーナルIEEJ Transactions on Fundamentals and Materials
130
5
DOI
出版ステータスPublished - 2010

ASJC Scopus subject areas

  • 電子工学および電気工学

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