Comparative Analysis of Different Excitation Techniques for Cylindrical Dielectric Resonator Antenna

International audienceDirect Microstrip line, Microstrip slot-coupled feed and hybrid coupler techniques are investigated for Cylindrical Dielectric Resonator Antenna (CDRA). The Dielectric resonator has a dielectric constant of 30, and etched on Arlan dielectric substrate having a relative permittivity of 3.58 and dimensions of 150 x 150 mm2. The structures are numerically analyzed using the numerical software HFSS. Radiation characteristics including return loss, gain, directivity and VSWR versus frequency characteristic are presented and compared based on the excitation method employed for the studied CDRA. The simulation results proved that the 90° hybrid coupler provides good performances particularly: a wider impedance bandwidth of 1.15 GHz and a maximum coupling of -45 dB