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A novel reconfigurable bandpass filter using varactor-tuned stepped impedance resonator (SIR) is introduced to achieve tunable central frequency and bandwidth. The varactor-tuned stepped impedance resonator structure consists of a stepped impedance with open or short-circuited stub and a varactor between the stubs. It's convenient to change the transmission zeros with the appropriate DC voltage controlling...
Nowadays, it becomes more and more important to miniaturize bandpass filters(BPFs) in RF front-ends because of size requirement of communication systems. As to achieve multifunction of RF front-end, BPFs with tunable passband, on the other hand, is another popular direction of BPF design. In this paper, a new three-order chebyshev BPF using asymmetry coupled lines and varactors, whose passband is...
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