Guest Editorial: Special Cluster on Recent Advances in Filtering Antennas and Arrays

With the advancement of modern wireless systems from the current 5G to future 6G communications, the electromagnetic environment is getting increasingly complicated. Filtering antennas, also known as filtennas, are increasingly popular in wireless communication systems [1], [2], [3]. This is owing to the urgent need for the increased integration of compact and multiband antenna elements with good radiation performance, while maintaining the excellent suppression over the undesired out-of-band interferences. Such filtering antennas have been found in their applications in various 2G/3G/4G/5G base stations, satellites, navigations, radars [4], [5], [6], [7], etc.