A compact and wide band SIW metamaterial impedance transformer

In this paper we introduce, for the first time, a compact and dual band substrate integrated waveguide metamaterial impedance transformer. The proposed transformer has been proposed to functions at bandwidth from 4.5 GHz and 6.5 GHz for all possible upper WiMAX frequencies. The design procedures supported by the analytical model has been explained in details. The design of the proposed transformer has been validated using electromagnetic full wave simulations and confirmed by experimental measurements. The results indicate that the proposed impedance transformer has the advantages of compactness and broad bandwidth compared to its conventional one.