Novel Diplexer made with Dual-Composite Right/Left-Handed Lines (D-CRLH)

In this paper the use of dual-composite right/left hand (D-CRLH) transmission lines is proposed for the design of diplexers. The D-CRLH diplexers present advantages over conventional diplexers such as smaller size. The design procedure and the design equations are presented in this paper. The non-linear phase response of a D- CRLH transmission line has been used to design arbitrary diplexers. An example illustrating the synthesis procedure is presented. Finally, the simulation results are compared with the measurement showing good agreement. These results confirm the excellent performance of the proposed circuit. These types of diplexers are particularly useful at the low microwave and UHF bands.