Characteristic Mode Analysis of a straight and an L-probe fed Microstrip Patch

In this paper, a straight probe fed and an L-probe fed rectangular patch antenna in the ultrahigh frequency region have been investigated. The 2:1 VSWR bandwidths of 38.49% and 46.17% have been achieved using the straight probe and the L-probe fed patches, respectively. Characteristic Mode Analysis (CMA) of the designs have been performed using the EM solver FEKO to identify the contributing modes for the wide band behavior of these antennas.