Effect of Cylindrical Shaped Material Perturbation on Resonance of Dielectric Resonator Antenna

Abstract

The paper presents a concept of cylindrical shaped material perturbation in rectangular dielectric resonator antenna (RDRA) which can be used for gain and bandwidth enhancement over original DRA. Material perturbation of cylindrical shape in two orthogonal directions will result in change of resonance of isotropic rectangular dielectric resonator antenna. The Effect of change of radius of cylinder for different dielectric materials is investigated. The proposed RDRA with centered cylindrical shape perturbation (PRDRA_CC) is analyzed theoretically using perturbation theory and simulated on 3D EM simulator HFSS. Theoretical and simulated results are compared and good agreement between two is obtained. Material perturbation provide wide tuning range, improved degree of freedom and hence more flexibility in designing antenna for given frequency range of application. Further, material perturbation and wall perturbation can be combined for obtaining polarization diversity in DRAs.