Advanced Spoof Surface Plasmon Polaritons based Wide Angle Broadband Dual-Beam Scanning Leaky-wave Antenna for sub-6 GHz Applications

This work presents a new idea of planar single layer spoof surface plasmon polaritons transmission line (SSPP-TL) based wide angle dual-beam scanning antenna for sub-6GHz applications. A unique kind of groundless single layered (S-L) SSPP-TL is proposed using binary tree shape metallic grooves. This unique pattern on the substrate generates propagating slow-wave mode in the desired frequency range. For generation of the radiating fast-mode, hexagonal patches are arranged periodically in the close proximity of the metallic groove to achieve fast beam steering with complete elimination of open stopband (OSB) effect. The calculated and numerically simulated results show that the dual-beam steering of 326° (from ± 85° to ± 78°) is achieved in visible space while frequency sweeps from 3.92 GHz to 7.58 GHz in the sub-6 GHz band with maximum gain of 14.92 dB. The fractional bandwidth of 141.35 % is achieved for the proposed designed antenna.