Millimeter Wave Wide-Angle Scanning Waveguide Slot Filtenna Array for 5G Applications

A wide-angle scanning filtenna array for 5G millimeter wave (mmWave) applications is proposed in this paper. The filtenna consists of a substrate integrated waveguide (SIW) cavity, a dual-mode waveguide cavity and two slots. The dual-mode resonance in the waveguide cavity is tuned by the metal ridges. As a result, a four-order band-pass filtering response with a radiation null is achieved. The prototype filtenna covers the 5G NR n258 band (24.25 – 27.5 GHz) with a flat in-band broadside gain of 7.1 dBi. Finally, an 8×2 slot filtenna array is designed with a good wide-angle beam-scanning performance.