Dielectric Resonators-Based Large Frequency Ratio Antenna

This paper presents a DRA-based large frequency ratio antenna that covers two widely separated frequency bands. The overall antenna consists of an aperture-fed RDRA which radiates at 3.4 GHz, whereas a 1x4 CDRA array radiates at the center frequency of 28 GHz. To reduce the area occupied by the radiators of the different bands, the CDRA array is placed on the RDRA and excited through dielectric-loaded waveguides. Overall, the antenna has the dimensions of 50 mmx50 mmx7.5 mm, and the simulated return loss is better than -10 dB in the regions of 3.28 GHz to 3.47 GHz and 27.52 GHz to 28.42 GHz.