Half-Mode Air-Filled Substrate Integrated Waveguide Self-diplexing Antenna for 5G Application

A novel and high-performance design of a halfmode air-filled substrate-integrated waveguide (AFSIW)-based self-diplexing antenna is presented in this letter. This antenna is fed by two individual microstrip feed lines lying face to face. A group of seven transverse slots radiates at two resonant frequencies, which are etched on the bottom surface of the top substrate. Its self-diplexing characteristic is proved with a maximum isolation of -45dB between two ports. This antenna achieves a gain of 4.2 and 3.1 dBi at 27.78 and 29.29 GHz respectively. Independent frequency tunability of this antenna is exhibited at both of the operating bands.