DocumentCode :
3366916
Title :
Radiation efficiency measurement of communication antennas with Wheeler Cap method
Author :
Karstädt, Patrick ; Gupta, Anshu
Author_Institution :
Dept. of High Freq. Eng., Helmut Schmidt Univ. Hamburg, Hamburg, Germany
fYear :
2011
fDate :
8-10 July 2011
Firstpage :
64
Lastpage :
67
Abstract :
One method to measure the radiation efficiency of an antenna is the Wheeler Cap method. It uses a wave guide, operated below his cut off frequency to eliminate the far field of the antenna. Using two measurements (with and without Wheeler Cap) it is possible to calculate the radiation efficiency. In this paper the impact of different shapes, material and the minimum heights of the Wheeler Cap are investigated. The measurement of radiation efficiency is not precise but the ease of measurement makes the method highly attractive. This contribution concludes that the shape and the material have no influence to the measured radiation efficiency as long as the design criterion like cap size are kept constant.
Keywords :
antenna radiation patterns; resonators; waveguide antennas; Wheeler Cap method; communication antennas; cut off frequency; radiation efficiency measurement; wave guide; Antenna measurements; Antennas; Frequency measurement; Materials; Reflection; Resonant frequency; Shape;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Students and Young Scientists Workshop, 2011 International
Conference_Location :
Cottbus
Print_ISBN :
978-1-4577-1651-5
Type :
conf
DOI :
10.1109/STYSW.2011.6155845
Filename :
6155845
Link To Document :
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