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In this paper, a compact dual-band filter using multilayer dual-mode substrate integrated waveguide (SIW) resonators is presented. Resonators are vertically stacked to reduce surface area and dual-mode resonator is applied to decrease the dimension. Moreover, the central frequencies of dual-band filter and coupling coefficient can be adjusted independently. For demonstration, A dual-band filter with...
In this paper, open-stub loaded resonator and short-stub loaded resonator are adopted to design a novel wideband diplexer and dual-band filter. To accelerate simulation speed, implicit space mapping method is firstly applied in multi-mode filter and diplexer design. To demonstrate it, a novel dual-band filter with central frequency at 1.8/2.5GHz and relative bandwidths of 16.7%/12%, and a diplexer...
A dual-band microstrip filter utilizing zero-degree coupled SIR feed linewith high frequency selectivity is presented. The first two resonant modes of stepped impedance resonators (SIRs) are chosen as the dual-band center frequencies. A pair of folded SIRs are coupled to form a second-order dual-band filter. Meanwhile, the SIRs are surrounded by a pair of zero-degree coupled SIR feed lines which introduce...
A new synthesis method is proposed for the design of high-performance parallel connected lossy filters. Compared with the nonuniform Q method, where the Q distribution is determined by the sensitivities of a preset coupling matrix, our method can provide a flat passband with flexible combination of nonuniform Q resonators by utilizing the predistortion technique with an adaptive offset. Two generalized...
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