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Artificial magnetic conductor‐based circularly polarized crossed‐dipole antennas: 1. AMC structure with grounding pins
Author(s) -
Ta Son Xuat,
Park Ikmo
Publication year - 2017
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/2016rs006203
Subject(s) - ground plane , conductor , optics , dipole , perfect conductor , physics , finite element method , dipole antenna , axial ratio , impedance matching , antenna (radio) , resonator , magnetic dipole , excitation , electrical impedance , circular polarization , materials science , microstrip , electrical engineering , engineering , scattering , quantum mechanics , composite material , thermodynamics
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.