Composite right/left-handed frequency-scanning antenna based on half mode substrate integrated waveguide

Abstract

The proposed leaky-wave (LW) antenna is a passive circuit built using the half-mode substrate integrated waveguide (HMSIW) technology. By etching interdigital slots as capacitive components on the HMSIW surface, a balanced composite right/left-handed (CRLH) structure is realized. This CRLH HMSIW leaky-wave antenna has a continuous beam-steering capability from -20° in the left-handed region to +15° in the right-handed region. With the cutoff frequency of 22.5GHz, the backfire/endfire radiation is obtained when the antenna works below/above its characteristic cutoff frequency and the broadside radiation is achieved at this balancing frequency point. The S-parameters and radiation parameters are presented. Measured results are closely consistent with the simulation. The proposed LW antenna shows some desirable merits, such as the simplicity in design, low-cost fabrication, and beam-steering capability which provides flexibility for the real application.