Wideband Filtering Dielectric Resonator Antenna Based on Dual Mode Slotline Resonator
[Objective]To meet the application requirements of miniaturized and multifunctional dielectric reso-nator antennas(DRA)in wireless communication systems,such as the Internet of Vehicles(IoV).[Method]A wideband filtering dielectric resonator antenna based on a microstrip-dual mode slotline resonator feeding struc-ture is proposed.In the antenna design process,the traditional slotline of the microstrip-slotline coupled feeding structure was replaced by a dual mode slotline resonator,forming a novel microstrip-dual mode slotline resona-tor coupling feeding network.This dual mode slotline resonator served as an energy coupler in the feeding net-work,which effectively excited the TE111 resonant mode of the DRA;At the same time,two slotline resonant modes could also be generated to participate in antenna resonance,broadening the antenna bandwidth.Addition-ally,by introducing a spur line on the microstrip feedline and combining the intrinsic resonance characteristics of the slotline resonator,a radiation null can be produced on both sides of the antenna passband,showing a quasi-el-liptical filter response on the gain curve.[Result]To further verify the performance of the antenna design,a pro-totype FDRA was fabricated and measured,and the measurement and simulation results were generally consis-tent.The central frequency of the antenna is 4.12 GHz,the impedance bandwidth is 53.40%(3.02～5.22 GHz),and the in-band flat gain is 5.7 dBi.[Conclusion]The antenna meets the application requirements of wireless communication systems,such as 5G and telematics.
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