Summary
International Symposium on Antennas and Propagation
2006
Session Number:2C2b
Session:
Number:2C2b-3
Analysis on the reflection method for the radiation effciency measurement using the transmission line model
Yasuo Katagili, Nozomu Ishii, Michio Miyakawa,
pp.1-6
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
The reflection method is krown as an accurate and simple method for measuring the radiation effciency of a small antenna Two big problems arise in the measurerrrent of the radiation effciency using this method, in which a straight waveguide and two sliding shorts are implemented. To reduce a measurement time, one sliding short is fixed, whereas the other sliding short can be moved. To improve the accuracy we can set an anterma under test at the middle of two sliding shorts, where the magnitude of the standing wave is locally maximized in the waveguide. When a sliding short is fixed, the effciency falls into negative territory at some frequencies. We analytically consider the drops using an equivalent trans- mission line model for the reflection method. Also, we derive overall effciency for above two cases and examine the way to measure the effciency with no drops.