Novel Filtering Antenna Based on Modified Closed Ring Resonator for 6G Applications

This work examines a small‐scaled filtering antenna using a modified closed‐ring rectangular resonator with increased gain, low profile, and wide bandwidth. The two resonators, made up of a modified closed rectangular ring and a U‐shaped ring having a mutual coupling effect between them, are used to design a wideband bandpass filter. The rectangular radiator has been used instead of the one resonator at the intended filter's load side in the proposed antenna with filtering characteristics. Further, the defected ground has provided wider bandwidth with improved gain. The filtering antenna has undergone a comprehensive study. With a center frequency of 5.95 GHz, the design provides a 10‐dB bandwidth for impedance of 57.8% between 4.25 and 7.65 GHz. It has a flat gain of almost 3.0 dB in the working range and a reflection coefficient of over 25 dB at the center frequency. The results are compared with the simulated values once the proposed structure is fabricated. The 6G frequency range would be a good fit for the suggested filtering antenna.