The mode features of an annular sector microstrip antenna

1 January 1990

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation

Vol. 38 (2) , 265-269
https://doi.org/10.1109/8.45130

Abstract

A rigorous analysis of the features of the modes of an annular sector printed microstrip antenna is presented. General expressions for its radiation field are derived by using the cavity model. The expressions are used to study the radiation patterns, radiation peak in the broadside direction, and beamwidth of different structures for various sector angles, widths, and modes of excitation. This includes the special cases of quarter-, half-, three-quarters-, and ideal-gap open-ring structures. Compared to a closed ring, the results indicate that the TM/sub 12/ mode is superior to the TM/sub 11/ mode with regard to the radiation properties in the annular sector as its angle approaches 2 pi .

Keywords

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