【Objective】To meet the application requirements of miniaturized and multifunctional dielectric resonator 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 structure 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 resonator coupling feeding network. This dual mode slotline resonator served as an energy coupler in the feeding network, 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. Additionally, 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-elliptical 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 consistent. 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.