Analysis on the miniaturization of reactive impedance surfaces with magneto-dielectrics

Miniaturization of the reactive impedance surfaces with the magneto-dielectric substrates is studied in this paper with their comparison to the high permittivity substrates. It has been found that magneto-dielectrics can provide wider reflection phase bandwidth while providing the same miniaturization with the high permittivity substrates. The application of these miniaturized surfaces to the low-profile microstrip patch antenna designs has also been included in this paper. It has been shown that the reactive impedance surfaces miniaturized with the magneto-dielectric materials provide better improvement in the bandwidth of the antenna compared to the reactive impedance surfaces miniaturized with the high permittivity substrates. It has also been found that the gain and the front-to-back ratio of the antennas on both type of substrates can be improved with the inclusion of RIS. Moreover, it has been observed that RIS performance becomes similar to that of a PEC ground plane as the size of the RIS decreases.