Two switchable dual-band bandpass filters with four states are presented. The two passbands can be switched independently, and the bandpass filters (BPFs) achieve four different operation states. Two switchable dual-band BPFs operating at 0.9 and 2.16 GHz have been designed, fabricated and tested to validate the design concept.
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Wen‐Hua Tu (2010) studied this question.
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