Effects of split ring arrangement and slit location on the miniaturization performance of split ring loaded dielectric resonator antennas

Artificial magneto-dielectric materials have enabled antenna miniaturization without loosing much gain or bandwidth and are especially promising for low-loss microwave applications where natural magnetic materials are too lossy to be used. In this paper, an artificial magneto-dielectric resonator antenna (AMDRA), based on a very low permittivity dielectric, with split ring resonators (SRRs) is studied. The effects of SRR arrangements and SRR gap locations on antenna performance and miniaturization capability are investigated. Comparison of SRR loaded AMDRAs and an unloaded reference DRA, operating at the same frequency as the loaded antenna, made of very high permittivity dielectric, shows that a maximum miniaturization of 21.8× can be achieved with a 3-layer of single large SRRs, while miniaturizations of 6× and 9.8× can be achieved with a 3-layer of 3*3 and 3-layer of 2*2 SRRs, respectively. Simulation results also show a wider bandwidth can be obtained when the SRR gaps are placed on the right side of SRRs due to the merged adjacent modes.