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A new compact tunable microstrip diplexer based on varactor-tuned dual-mode stub-loaded resonators is investigated. By using the dual coupling paths, the two channel filters can then be designed independently. In addition, by properly varying the dc bias voltages applied to the varactors loaded onto the dual-mode resonators, the passband frequencies of the diplexer can be changed over a wide tuning...
A compact, high-selectivity, and high-isolation microstrip quad-channel diplexer has been presented in this paper. By introducing multiple coupling paths between input and output ports, the diplexer design is, therefore, more flexible and can be extended to higher-order multiplexers. In addition, no extra matching network is needed for this design, resulting in a smaller circuit size. For the demonstration,...
A high-isolation and high-rejection microstrip diplexer based on the stub-loaded resonators with independently controllable transmission zeros has been presented. The transmission zero is an inherent characteristic of the stub-loaded resonator. By allocating properly these transmission zeros at the specific frequencies, the output isolation and out-of-band rejection of the diplexer can thus be improved...
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