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Simple, compact low-cost microwave bandpass filters with strongly asymmetric characteristics, based on new topologies, are investigated, designed, fabricated and measured. A classical fourth-order filter or quadruplet, for example, has two transmission zeros located symmetrically, one on each side of the passband. A filter of the same order and, consequently, with a similar insertion loss, can offer...
A novel doublet modular in filter design is introduced in the paper. We can use the doublet modular in bandpass filters. Using the doublet modular, asymmetry transmission zeros are created in the bandpass filter. We can locate the two transmission zeros at one side of the passband or both side of the passband. The doublet modular is demonstrated very flexible by showing a number of coupling matrices...
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