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A novel switchable bandpass filter with two-state frequency responses is presented, where dual-band bandpass and single bandpass characteristics can be conveniently switched by turning pin diodes on and off. The switchability results from the effect of different working modes. The filter can work as a dual-band bandpass filter obtaining two centre frequencies, 1.8 and 3.5 GHz, which could be appropriately...
A novel reconfigurable bandpass filter based on a net-type stepped-impedance resonator (SIR) is investigated. This work aims to demonstrate a new approach to implement the reconfigurable centre frequency of the bandpass filter. The approach controls the ratio of the two characteristic impedances of a quarter-wavelength microstrip SIR with pin diodes. The proposed filter is designed to be reconfigured...
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