Abstract
A novel low-profile dual-circularly-polarized (CP) substrate integrated waveguide (SIW)-cavity-backed slot patch antenna with wide axial ratio beamwidths (ARBWs) is proposed. First, two orthogonal slots are etched on a square patch, and a SIW cavity is backed under the patch. Evolution of the SIW-cavity-backed cross-slot antenna is analyzed, and its beamwidths are enhanced by using the E-plane omnidirectional radiation of the slots. In order to broaden the axial ratio beamwidths (ARBWs), four different SIW-cavity-backed slot patch antennas are also compared. Then, two rat-race couplers and two Wilkinson power dividers are skillfully cascaded together, and a novel six-port feeding network for the dual-CP antenna with high isolations is designed. Finally, a compact dual-CP slot patch antenna with dimensions of 0.53<sub>0</sub>0.53<sub>0</sub>0.035<sub>0</sub> is fabricated. Its measured results reveal that the antenna achieves 180 / 194 left-handed CP (LHCP) ARBWs and 203 / 200 right-handed CP (RHCP) ARBWs in two orthogonal principal planes at the center frequency of 5.2 GHz. Its measured isolation between two ports are greater than 16 dB in the entire bandwidth.
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