New composite right/left-handed transmission line using substrate integrated waveguide and metal-patches

A new composite right/left-handed transmission line (CRLH-TL) for millimeter wave frequency is proposed and investigated theoretically and experimentally. It consists of a substrate integrated waveguide (SIW) with slit apertures and a dielectric film with metal patches. A prototype of SIW metal-patch type CRLH-TL that satisfies the balance condition is designed. Dispersion diagram and S-parameters are derived numerically, and typical field distributions of RH and LH transmission and the zero-order resonance are shown. The experimental results of the proposed SIW metal-patch type CRLH-TL agree the analytical results well. Because both the layers of the SIW and the metal-patched dielectric film compose simple planar periodic structure, the SIW metal-patch type CRLH-TL has advantage of simple manufacturing. It is expected to be one of the basic structure of CRLH-TL or components such as leaky wave antenna and LH coupler above 10 GHz or millimeter wave frequency.