Abstract
The aperture coupled feeding technique has been demonstrated to be effective in enlarging the impedance bandwidth of patch antennas. Moreover, it can improve the Axial Ratio (AR) bandwidth of a circularly polarized (CP) patch antenna [1]. Recently, a novel slot coupling feeding technique has been presented in [2], where the two orthogonal microstrip feeding lines of a dual-linearly polarized patch are coupled to the square radiating square patch through a square ring slot. There, it has been shown that the symmetry properties of the square-slot coupling geometry can give good performance in terms of port isolation and radiation pattern characteristics. In this paper, the coupling technique in [2] has been applied to realize a single-feed CP square patch. Although single-feed CP patches exhibit smaller AR percentage bandwidths with respect to dual-feed CP antennas, their layout is more compact and then suitable for the implementation of electrically large arrays.
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