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Improved Expressions for Calculating the Impedance of Differential Feed Rectangular Microstrip Patch Antennas

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3 Author(s)
Ziqiang Tong ; Inst. for Commun. Eng. & RF-Syst., Johannes Kepler Univ. Linz, Linz, Austria ; Stelzer, A. ; Menzel, W.

This letter presents an analysis of the impedances of differential feed microstrip rectangular patch antennas. It is shown that the impedance of a differential feed antenna exhibits cosine squared behavior over the feed distance. We present improved expressions for calculating the impedance match feed positions of a differential feed rectangular microstrip patch antenna with given dimensions, on the base of which we designed two antenna prototypes. Both simulation and measurement results match our theoretical prediction.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:22 ,  Issue: 9 )