Dual band half-mode substrate integrated waveguide leaky wave antenna with wide backward scanning

A novel half-mode substrate integrated waveguide (HMSIW) leaky wave antenna is presented. The HMSIW loaded with periodic horizontal T shaped slots produces dual-band characteristics with backward scanning capability in each band. The obtained return loss bandwidths are 1.65 GHz in the upper band (10.95 GHz to 12.6 GHz) and 0.9 GHz in the lower band (9 GHz to 9.9 GHz). The achieved scanning ranges are 27° in the upper band (from −8° to −35°) and 30° in the lower band (from −38° to −68°). The simulated gain is 13.2 dBi and 16.5 dBi in the lower and upper band respectively. The proposed structure has inherent band rejection filtering capability from frequency 10 GHz to 10.9 GHz.