Effect of Complementary Split-ring Resonators on Beam Scanning in the CRLH-leaky Wave Antennas Based on Split-ring Resonators and Slotline

摘要

In this paper, a new leaky wave antenna (LWA) based on complementary split-ring resonators (CSRRs) and slot line are proposed. Effects of CSRRs on beam scanning in a composite right/left handed (CRLH) LWA based on split-ring resonators (SRRs) are investigated. Actually, the effects of these structures on the scan angles have been compared. The commercial Ansoft HFSS software is adopted for the simulations. The proposed LWA is analyzed in S and C band frequency, and the results reveal that the CSRR improves the gain in backward leaky wave radiation. The CSRR-LWA just scans the negative angles. Furthermore, the simulation results demonstrate the potential of the SRR-LWA to radiate from backward to forward scanning angles. As a result this miniaturized CSRR-LWA main beam can scan the space for C-band from -115 to -170 degree in phi = 0 (deg) plane. In the other word, the CSRR-LWA only scans in the negative ranges of theta, but SRR-LWA scans the space from +94° to +156° in positive ranges and -1334° to -177° in negative ranges of theta.