T. Vlasits et al., PERFORMANCE OF A CROSS-APERTURE COUPLED SINGLE FEED CIRCULARLY-POLARIZED PATCH ANTENNA, Electronics Letters, 32(7), 1996, pp. 612-613
A novel method for radiating circular polarisation (CP) with a patch a
ntenna without AN external polariser has been investigated. It has the
advantage of improving the axial ratio bandwidth for single feed CP a
ntennas by using a thick air substrate and inverted patch configuratio
n.