Broadside Radiation based on Even-mode Spoof Surface Plasmon Polaritons Excited by Slot in AMC Ground Plane

In this paper, a broadside antenna based on even mode of spoof surface plasmon polaritons (SSPP) using artificial magnetic conductor (AMC) ground plane is proposed. Slot in AMC ground plane is used for first time to excite even mode of SSPP in horizontally placed corrugated metal strip while maintaining low profile. Planar configuration of the proposed design is possible due to the horizontal E-field of slot in AMC ground. The in-phase resonating even mode currents of both the SSPP strips contribute for radiation in broadside direction. The proposed antenna offers 89% radiation efficiency with 6.7 dBi gain with low profile of only 0.068 λ (where λ is free space wavelength at resonance frequency of 3.2 GHz.)