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50 ohm annular-ring embedded circular patch antenna circular polarisation cross-slot ground plane
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Compact Annular-Ring Embedded Circular Patch Antenna With Cross-Slot Ground Plane For Circular Polarisation, Xiulong Bao, Max Ammann
Compact Annular-Ring Embedded Circular Patch Antenna With Cross-Slot Ground Plane For Circular Polarisation, Xiulong Bao, Max Ammann
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A dual-frequency dual-circularly polarised patch antenna with wide beamwidth is proposed. The two-layer structure comprises circular patches with offset circular slots connected to rectangular slots. They provide orthogonal perturbations realising RHCP and LHCP for the lower and upper bands, respectively. The wide beamwidth is realised by extending the substrate beyond the groundplane. Measurements show a maximum beamwidth of 180deg and gains of 3.9 and 0.5 dBic for zenith and 10deg elevation, respectively, for the upper band. The measured beamwidth for the low band is 130deg with a maximum gain of 3.9 and -0.7 dBic for zenith and 10deg elevation, respectively. …