Analysis of Cylindrical Dielectric Resonator Antenna with Modified Micro-Strip

This paper provides a comparative analysis of cylindrical dielectric resonator antenna with simple micro-strip feed to that of a modified micro-strip feed. The fundamental radiator is having a radius of 5.96 mm and height of 9.82 mm with relative permittivity e r of 10. It is placed over a substrate having dimension 40×40×0.785 mm3 with e r equal to 2.5. The substrate is embedded with an infinite ground plane to reduce the physical height of the antenna according to image theory. Two types of micro-strip feeding mechanisms are being experimented. The simplified micro-strip feed radiator resonates at 5.7 GHz with impedance bandwidth of 14.03%. The modified micro-strip feed with an added stub resonates at 10.65 GHz & 13.5 GHz with impedance bandwidth of 21.596% & 13.33% respectively. Matching profile, directive gain and efficiency can be enhanced by almost 10% by modifying simple micro-strip feed to micro-strip feed with stub structure of proposed antenna.