The realizing of radiation null for a SSPPs leaky-wave antenna

A new design of spoof surface plasmon polaritons (SSPPs) leaky-wave antenna (LWA) with radiation null in the radiation pattern is proposed in this paper. The antenna is fed with coplanar waveguide, and consists of a main radiation section and an auxiliary radiation section. By controlling the initial phase, the phase constant and the radiation strength of auxiliary radiation section, a specific side lobe in the radiation pattern of the main radiation section can be suppressed due to the field cancellation between the far fields of the main and auxiliary sections. Thus a null region can occur in any desired direction. In this way a null region with depth −23.8 dB around θ = 220° at 13 GHz is achieved, which is about 9.5 dB lower than that of the original antenna.