Switchable dual-band filter

Details Switchable dual-band filter Switchable dual-band filter

2008-06-10

2008-06-10

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S032000

Reexamination Certificate

active

07385465

ABSTRACT:
A switchable dual-band filter comprises first and 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 resonator to the second resonator, and vice versa. 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 a smaller circuit area, and is cost-effective in manufacturing. The impedance at both operating passbands can also be matched properly.

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IEEE Transactions on Microwave Theory and Techniques, vol. 49, No. 12, Dec. 2001 Tunable Active Filters Having Multilayer Structure Using LTCC Keisuke Kageyama, Member, IEEE, Kohki Saito, Hisanori Murase, Hideki Utaki, and Toshishige Yamamoto, Member, IEEE.

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