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A FILTERING DIELECTRIC RESONATOR ANTENNA WITH HIGH BAND-EDGE SELECTIVITY

By Y. Gao, Y.-C. Jiao, Z.-B. Weng, C. Zhang, and Y.-X. Zhang

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Abstract:
A filtering rectangle dielectric resonator antenna (DRA) with high band-edge selectivity is proposed in this paper. The DRA is fed by a simple hybrid feeding structure consisting of a microstrip-coupled slot on the bottom and a thin metallic strip on the side of DRA to excite the fundamental TEy1δ1 mode. The feeding structure establishes a cross-coupled mechanism which includes electric and magnetic coupling; thus, introducing two radiation nulls at the band edge without any filtering circuits. By using the designed hybrid feeding structure, a bandpass filtering response is obtained. For enhancing band-edge selectivity, a shorted stub is introduced to weaken the coupling between the two microstrip stubs of the feeding structure. A wide impedance bandwidth of 19% and a flat gain of around 5.6 dBi are realized. To validate the design, a prototype is fabricated and measured, showing a favorable agreement with the simulated results.

Citation:
Y. Gao, Y.-C. Jiao, Z.-B. Weng, C. Zhang, and Y.-X. Zhang, "A Filtering Dielectric Resonator Antenna with High Band-Edge Selectivity," Progress In Electromagnetics Research M, Vol. 89, 63-71, 2020.
doi:10.2528/PIERM19112703

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