Design investigation of a leaky wave antenna using HMSIW technique

A new leaky wave antenna (LWA) is introduced. The proposed antenna radiates through a dielectric aperture created by half mode substrate integrated waveguide (HMSIW) technique. The main idea is similar to previous HMSIW leaky wave antenna but adding an undergrounded dielectric aperture to the proposed structure results in gain and bandwidth enhancement. However the proposed antenna is able to scan wider angular sector in compare with the previous HMSIW leaky wave antenna. A sample antenna is designed and simulated using HFSS software. Radiation characteristics of the antenna are also investigated. It is illustrated that half conical radiation pattern is provided by the proposed antenna. The designed antenna is also fabricated and its radiation properties are measured. Results show that the proposed antenna has the advantages of wide band width and high gain in addition to low profile, low fabrication cost, low weight and its common features including high directivity and beam steering capability which make it suitable for millimeter-wave applications.