Coupling Enhancement of Hemispherical Dielectric Resonator Antenna

The proposed design describes a simple and new method to enhance the coupling of the hemispherical dielectric resonator antenna (HDRA) with waveguide feed. This is achieved by embedding a dielectric block of hard rubber inside the waveguide. The low permittivity material provides excellent coupling and impedance matching. Simulations have been done using Ansoft HFSS. The structure achieves a coupling of 98% at resonance frequency 9.02 GHz with an impedance bandwidth of 5.2 % and a maximum gain of 6.35 dBi.