Abstract
ABSTRACTThis paper presents a novel structure of a compact circularly polarized (CP) antenna. CP is obtained using a parasitic quasi-rectangular strip placed coplanar to the feedline. A ground plane perturbation combined with the asymmetric geometry of the coplanar waveguide ground planes is utilized to excite additional CP modes. All antenna dimensions are rigorously optimized to achieve the best possible performance in terms of the impedance and axial ratio bandwidth (ARBW). The size of the proposed antenna is only 24.7 × 25 mm2. The antenna performance is validated experimentally. A close agreement between simulation and experimental results is observed. A wide impedance bandwidth of 42.6% (3.93–6.06 GHz) and ARBW of 42% (3.96–6.03 GHz) is with 98.5% bandwidth overlap between |S11| and AR is achieved. The average realized gain of the antenna throughout the operating frequency is 3.4 dBic. Left-hand circular polarization radiation is achieved in the +z-direction..
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