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Effects of ground plane truncation on the impedance of a patch antenna

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1 Author(s)
A. K. Bhattacharyya ; Dept. of Electr. Eng., Saskatchewan Univ., Saskatoon, Sask., Canada

The surface-wave admittance of a circular patch antenna with finite ground plane dimensions is formulated. The orthogonal relationship between the space wave and various surface-wave modes is invoked to determine the amplitude of a surface-wave mode produced by the equivalent magnetic current of the patch. The surface wave admittance, and hence the input impedance of a patch is found to vary widely with the ground plane size. Numerical results for the input impedance agree well with the measured data which confirms the validity of the formulation.<>

Published in:

IEE Proceedings H - Microwaves, Antennas and Propagation  (Volume:138 ,  Issue: 6 )