Rectangular Dielectric Resonator Antenna with Corrugated Walls

A wideband and high-gain rectangular dielectric resonator antenna (RDRA) with corrugated walls is introduced. By generating corrugation in two opposite sidewalls of the RDRA, the radiation intensity from them compared to that of the top wall increases, which in turn will raise the boresight gain of the antenna. Also, the presence of the higher air content in the antenna body lowers the effective dielectric constant of the RDRA, leading to a wideband configuration. For demonstration, the proposed antenna is designed, fabricated, and measured. The measured results show that the proposed antenna radiates in the broadside direction with a high gain of 9 dB. Also, a wide impedance bandwidth of 15.3% from 3.57 to 4.16 GHz is achieved. In addition, the radiation efficiency of more than 90% over the whole bandwidth is attained. A good agreement between the simulated and measured results is attained.