Abstract
A novel wideband circularly polarised (CP) magnetoelectric dipole antenna, which is excited by microstrip line aperture-coupled feeding structure, is proposed and investigated. The wide impedance bandwidth and broadband CP characteristic are achieved based on the simple feeding structure. An antenna prototype is fabricated and exemplified to validate the proposed concept. Measured results show that the proposed antenna achieves an impedance bandwidth of 65% for voltage standing wave ratio <2 from 2.97 to 5.85 GHz, the broadside maximum gain is up to 10.2 dBi. Moreover, the 3 dB axial ratio bandwidth is about 75%, ranging from 2.7 to 5.8 GHz. Stable and symmetric unidirectional radiation patterns with low backward radiations are obtained over the operating band.
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