Switchable dual-band filter

Disclosed is a switchable dual-band filter, which comprises a first and a second switchable resonators, a coupling structure having two ends respectively connecting the first and the second switchable resonators, an input impedance conversion circuit connecting an input terminal and the first resona...

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Bibliographic Details
Main Author CHEN CHENGUNG
Format Patent
LanguageEnglish
Published 21.06.2007
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Summary:Disclosed is a switchable dual-band filter, which comprises a first and a second switchable resonators, a coupling structure having two ends respectively connecting the first and the second switchable resonators, an input impedance conversion circuit connecting an input terminal and the first resonator, and an output impedance conversion circuit connecting an output terminal and the second resonator. The coupling structure couples the first resonators to the second resonator, and via verse. The input/output impedance conversion circuit converts the impedance on the input/output terminal into two distinct impedances that correspond to a first and a second operating frequency. The filter is simple in structure, occupies less circuit area, and is cost-effective in manufacturing. The impedance at both operating passbands can also be matched properly.
Bibliography:Application Number: US20050305913