Active Dual-polarized Leaky-wave Antenna Based on Plasmonic metamaterial

A dual polarization, fixed-frequency beam scanning leaky-wave antenna (LWA) based on the spoof surface plasmons (SPs) is proposed. The structure consists of two metallic strip lines with periodic unit cells, which are loaded with varactor diodes. One periodic unit radiates horizontal polarization electromagnetic waves, while another periodic unit radiates vertical polarization electromagnetic waves. Since there aren’t any mutual couplings between the two radiation structures for different polarization, the degree of polarization isolation is as high as 30dB. The antenna is designed at 3.3 to 3.8 GHz. The simulated beam scanning angle is from -17° to 21° at 3.6 GHz.