A Wideband Dielectric Resonator Antenna With Four Dielectric Blocks for Generating Filtering Response

In this letter, a wideband filtering dielectric resonator antenna is proposed. The antenna consists of a hybrid dielectric block and four dielectric blocks with metal vias. The hybrid dielectric resonator is surrounded by the four dielectric blocks with metal vias. It is fed by a microstrip feedline with two bent transverse stubs. The dielectric blocks with metal vias can generate two radiation nulls at band edges, thereby realizing the filtering function. The two laterally bent branches of the microstrip line, which differ in length and shape, excite an additional resonant mode that improves impedance matching and enhances suppression in the upper stopband. This study exhibits a 10-dB impedance bandwidth of 42% (2.27-3.44 GHz), a peak gain of 7.35 dBi. To prove the correctness of the simulation, the antenna prototype is fabricated and tested. The experimental measurements closely match the simulation results.