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