Wide-Angle SSPP-based Leaky-Wave Antenna with Scanning Improvement in the Forward Quadrant for Millimeter Wave Applications

This paper proposes a wide-band wide-angle frequency dependent beam scanning antenna (FD-BSA) for applications in mm-wave frequency bands. The proposed leaky-wave antenna (LWA) is composed of three parts: a CPW as the feeding network, a spoof surface plasmon polariton transmission line (SSPP TL) as the waveguide, and circular parasitic patches as periodic modulation parts to change slow wave of SSPP TL to fast-wave radiation. To improve the performance of the LWA at forward directions, slots on circular parasitic patches are introduced. The total beam scanning range of the proposed SSPP-based LWA is from 35 to +60 when the operating frequency changes from 55 GHz to 105 GHz (FBW = 62.5%).