Low-Profile GAP-Cavity-Backed Slot Antenna for Millimeter-wave 5G Applications

In this paper, for the first time in gap waveguide (GW) technology, the radiation and feed sections are implemented in only one substrate. Hence, a low-profile antenna structure is achieved. To verify the operation of this concept, a cavity-backed slot antenna is designed in the millimeter-wave frequency band. Specifically, the cavity section and the feed line are embedded on two sides of a substrate. This low-profile structure can be a good candidate for 5G wireless communication systems.