A Slot Filtenna Based on Gap Waveguide Using Novel Sidewalls

This paper presents a cavity-backed slot filtering antenna (filtenna) designed based on gap waveguide structure using novel sidewalls. Rather than using traditional full-length pins, the unit-cell geometry of the proposed pin-form consists of a pin mounted on a solid wall, where the total height of the pin and wall is quarter wavelength of the operating frequency in free space. The resonant frequency of the designed filtenna is 30.5 GHz and the fractional bandwidth is 6.3%. The designed filtering antenna is fabricated using computer numerical control (CNC) milling technology. The simulated and measured results of the proposed filtenna are in excellent agreement.