Circularly polarized microstrip antenna based on waveguided magneto-dielectrics

In this paper, we make an investigation on the waveguided magneto-dielectric materials (WG-MDM) based on the embedded meanderline structure. As verified by retrieval results of effective medium parameters, the WG-MDM exhibits nearly the same magneto-dielectric property with respect to the orthogonally applied TEM wave excitations. The WG-MDM is utilized as the artificial substrate of square microstrip patch antenna and the patch is perturbed at two corners to realize circularly polarized radiation. Simulation results show that the impedance and axial ratio bandwidths of the resulting novel circularly polarized patch antenna have increased by 78% and 71%, compared with those of pure-dielectric-substrate-based patch antenna with the same size.