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Microstrip-fed broadband circularly polarised monopole antenna

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4 Author(s)
Wu, J.-W. ; Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Ke, J.-Y. ; Jou, C.F. ; Wang, C.-J.

A microstrip-fed broadband circularly polarised (CP) monopole antenna was studied. A broad impedance bandwidth and wide axial ratio bandwidth (AR-BW) could be achieved simultaneously. This antenna used a conventional monopole architecture, except for its deforming ground plane and asymmetric-feed approach. The asymmetric-feed was used to provide an orthogonal component distinct from its original linear polarisation. In addition, by embedding a slit and a stub on the ground plane, this antenna could generate CP wave radiation and achieve a broad impedance bandwidth. According to the measurement results, the impedance bandwidth was 6.56 GHz for a 10 dB return loss, which covered a range of 2.32 8.88 GHz. The AR-BW was 1.2 GHz for a 3 dB AR, which covered a range of 3.2 4.4 GHz.

Published in:

Microwaves, Antennas & Propagation, IET  (Volume:4 ,  Issue: 4 )