Piezoelectric Transducer-Controlled Dual-Mode Switchable Bandpass Filter |
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Authors: | Wen-Hua Tu Kai Chang |
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Affiliation: | Dept. of Electr. & Comput. Eng, Texas A&M Univ., College Station, TX; |
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Abstract: | A piezoelectric transducer-controlled dual-mode switchable bandpass filter is introduced. A piezoelectric transducer is used to lift up or pull down the attached dielectric substrate perturbation. When the dielectric substrate is pulled down, the perturbation excites dual modes and the dual-mode filter is on. The return loss is better than 10 dB and the insertion loss is less than 3 dB from 2.92 to 3 GHz. When the dielectric substrate is lifted up, the dual-mode resonator is unperturbed and the dual-mode filter is off. The isolation is 21 dB at 3 GHz. The on-off ratio is 18 dB |
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