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A hybrid equivalent circuit model for the simulation of manifold multiplexers without sleeves is presented. The model uses an EM based T-junction which also contains the first coupling iris between manifold and channel filter. The first resonator connected to the T-junction is represented by a section of waveguide transmission line and the rest part (a reduced order channel filter) is represented...
A four-pole tri-band bandpass filter (BPF) is designed with stub-loaded resonators (SLRs). The SLR is constructed by a double spiral structure (DSS) loaded with two folded T-shape stubs at the midpoint. A tri-feeding structure is proposed to meet the required external couplings of the three passbands simultaneously. The center frequencies and bandwidths of the three passbands can be independently...
This paper presents a quad-band filter using centrally shorted-stub loaded resonators operated at the first and third passbands and stepped impedance resonators fixed at the second and fourth passbands. A special feed structure consisting of two stepped impedance lines is proposed, and a pair of parallel coupling lines is loaded at the center of the shorted-stub loaded resonators to enhance the couple...
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