A New Aperture Antenna Using Substrate Integrated Waveguide Corrugated Structures for 5G Applications

In this letter, two new high-gain aperture antennas are presented using substrate integrated waveguide (SIW) corrugated structures. The antenna is excited by a transmission line at the bottom layer. Power is coupled to the patch through a cavity in the middle layer. Due to constructive superposition of the electric field by the grooves and patch, a relatively high-gain and narrow radiation pattern is achieved that depends on the number of grooves. In the proposed structure, three layers of boards for fabricating a resonant transmission line and specific SIW structures are employed instead of a waveguide feeder and grooves on a metallic plate as in conventional corrugated antennas. This technique removes the need to use a metallic layer and thus reduces the weight of the antenna structure. Two samples with two and four grooves have been designed, fabricated, and tested for 5G applications to show the validity of this approach. The results show that these grooves increase the gain of the antenna significantly.