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Small antenna efficiency measurements using overmoded cavities

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2 Author(s)
Johnston, R.H. ; Dept. of Electr. & Comput. Eng., Univ. of Calgary, Alta., Canada ; Jiangzuo Chu

The reflection method of determining the antenna efficiency using overmoded cavities is treated. Two types of cavities are used, one is a rectangular waveguide with sliding shorts, and the other is a cubic cavity with a mode stirrer. Both cavities tend to show low efficiency notches near the cutoff frequencies of higher order modes.

Published in:

Antennas and Propagation Society International Symposium, 2003. IEEE  (Volume:4 )

Date of Conference:

22-27 June 2003