A full‐wave solution for the mutual coupling between circular microstrip patch antennas

Abstract

A full‐wave solution for the mutual coupling between circular microstrip patches fed by idealized vertical probe feeds is presented. The grounded slab Green's function is used together with the moment method to determine the current distribution on each patch. From this, the patch port impedance matrix and, hence, the mutual coupling can be determined. Measured data that validate the theory are presented.

Closed‐form expressions for computation of mutual admittance of a class of gap‐coupled circular microstrip antennas

“…While the most common antenna structure for tags is a linearly polarized antenna, such as a dipole or a loop [3][4][5][6][7]. However, such antennas usually have nulls or very low gains in certain directions in their radiation patterns.…”

“…An expression is presented in [3] with the constraint that certain coefficients are to be deduced by numerical computation. Some other mutual coupling estimation techniques related to circular microstrip antennas are full-wave solutions [4] and generalized transmission line techniques [5]. Other methods include combined spectral domain with method of moments [6].…”