volume | PIER Journals

Abstract

This paper proposes a wideband, low-profile, circularly polarized (CP) crossed-dipole antenna with an artificial magnetic conductor (AMC) reflector. The antenna consists mainly of a pair of orthogonal half-wavelength dipoles, two 90$^\circ$ phase-delay rings, four parasitic patches, four pairs of vertically arranged metallic strips, an AMC reflector, and a square ground plane. CP radiation is generated by exciting bow-tie dipole arms via phase-delay rings. Introducing parasitic patches and vertical metallic strips optimizes the surface current distribution, broadening the impedance-matching bandwidth and axial ratio bandwidth (ARBW). Meanwhile, using the AMC structure as a reflector effectively reduces the antenna profile. We fabricate a prototype of the proposed antenna to verify consistency between simulated and measured results. The measured results show that impedance bandwidth (IBW) is 1.51-2.54 GHz (50.9%), and ARBW is 1.53-2.51 GHz (48.5%). The antenna achieves a peak gain of 8.5 dBic and an average gain of 7.05 dBic across the entire operating band. Furthermore, the antenna features an ultra-low profile of 0.12λ_L at the lowest operating frequency.

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Dr. He Liu

Professor Han Lin

Professor Zhonggen Wang

Professor Wenyan Nie