A Novel Design of Diplexer with Dual Mode Stub Loaded Resonator and Double E-shape Resonators

A novel diplexer consisting of a dual mode stub-loaded resonator and two double E-shape resonator is presented in this letter. The diplexer is mainly a electronic device which has three ports. Then an stub-loaded resonator is added the common input port of the diplexer's channel filter to achieve input matching at two pass-bands of diplexer. And two double E-shape resonators are added at output port to achieve desired pass-band. Two double E-shape resonators are work together with one mode produced by the common stub-loaded resonator to form a pass-band or operating band of the proposed diplexer. Extensive study is then conducted on coupling scheme involved in various parts of the diplexer. Double E-shape resonator is employed to create a desired transmission zero in the stop band and to achieve minimum insertion loss and high isolation, compact size. The proposed diplexer is in final simulated.