Gain Enhancement of Curvy Spoof Surface Plasmon Polariton Antenna With Controllable Bandwidth for 5G Applications

A method for improving gain in spoof surface plasmon polaritons (SSPPs) antenna including guiding and radiating parts is proposed. This method is based on using a curvy tapering area instead of linear one to matched the antenna to the air. The obtained results show that realized gain can be improved approximately 3 dBi by this method. Furthermore, by using corrugated unit cells and stubs an undesired frequency band can be rejected. Since the antenna works at 27.2-28.2 GHz, it can be used for 5G applications.