Title :
Small antenna efficiency measurements using overmoded cavities
Author :
Johnston, R.H. ; Jiangzuo Chu
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Calgary, Alta., Canada
Abstract :
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.
Keywords :
S-parameters; antenna testing; electromagnetic wave reflection; electromagnetic wave scattering; rectangular waveguides; cubic cavity; higher order mode cutoff frequencies; input reflection scattering parameter measurement; low efficiency notches; mode stirrer; overmoded cavities; radiation efficiency; reflection measurement method; sliding short rectangular waveguide; small antenna efficiency measurements; Antenna measurements; Batteries; Cutoff frequency; Energy consumption; Rectangular waveguides; Reflection; Reflector antennas; System performance; Testing; Transmitting antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1220375
