Substrate-Integrated Dual-Band Leaky-Wave Antenna With Open Stopband Suppression

ThThis communication presents a substrate-integrated dual-band continuous transverse stub (CTS) leaky-wave antenna (LWA). Two kinds of CTS slots, i.e., conventional CTS slots and those ones backed by waveguide slots are interlacing to support the excitation of n = -1 harmonic in two different frequency bands, thus, enabling dual-band beam scanning. Furthermore, the open stopbands (OSBs) in both bands are suppressed by adding matching stubs and arranging the radiating slots in corrugation, so that the continuous beam scanning from backward to forward can be obtained. The ultra-wideband linear source generator based on substrate-integrated coaxial line (SICL) is subsequently designed to support the radiating structure. For validation, a prototype operating at both 13-20 and 25-37 GHz is implemented. Experimental results show that the scanning ranges of the LWA are -48 degrees to +50 degrees and -53 degrees to +38 degrees over the low- (LB) and high-frequency band (HB). During the beam scanning, the peak gain is better than 8.4 and 13.2 dBi at the two operating bands.