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Artificial magnetic conductor-based circularly polarized crossed-dipole antennas: 1. AMC structure with grounding pins

Authors: 

Son Xuat Ta, Ikmo Park

Source title: 
Radio Science, 2017 (ISI)
Academic year of acceptance: 
2016-2017
Abstract: 

In this paper, we analyze low‐profile circularly polarized (CP) antennas comprising a crossed‐dipole radiator on finite artificial magnetic conductor (AMC) surfaces. The crossed dipole is fed by a pair of vacant‐quarter printed rings to produce CP radiation. The AMC structure consists of a lattice of square metal plates on a grounded dielectric substrate with connecting pins between the patches and the ground plane. In this paper, we focus on the excitation of surface waves propagating on the finite‐sized AMC surface, which generates extra resonances and CP radiations for the radiation structures. We predict the surface‐wave resonances using a cavity model. In this model, the finite‐sized AMC structure is considered as a waveguide resonator. We verify the predicted results computationally using the finite element method‐based full‐wave electromagnetic solver Ansoft high‐frequency structure simulator. The results show that these extra resonances and corresponding CP radiations can be used to broaden the impedance matching and axial ratio bandwidths of the antennas, respectively.