A wideband multilayer antenna with dual circular polarisations (CPs) is presented. The antenna consists of stacked square patches fed by striplines and a branch line coupler. Two orthogonally positioned H‐shaped slots are used as the coupling aperture for the striplines. The dual‐CP radiation is obtained by exciting the TM 01 and TM 10 modes of the radiating element with 90° phase differences. The presented dual‐CP antenna has a multilayer configuration with a compact size and it is suitable to be applied to the design of array antennas. To verify this design concept, one prototype operating in the K‐band is designed and fabricated. The measurement results show that the prototype has more than 13% impedance bandwidth with good CP radiations.
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Luo et al. (2015) studied this question.
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