Resonator filter utilizing cascaded impedance inverters

Details Resonator filter utilizing cascaded impedance inverters Resonator filter utilizing cascaded impedance inverters

1994-04-28

1996-03-12

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 333189, H03H 900

Patent

active

054990025

ABSTRACT:
A filter (200) having an input terminal (208), an output terminal (209), and a common terminal (210) includes two impedance inverters (201,202) and a first resonator (203) that is operable at a resonant frequency. Each impedance inverter (201, 202) is coupled to the common terminal (210) at a common node (223) and includes a corresponding input node (221,225) and output node (222, 226). The input node (221) of the first impedance inverter (201) is coupled to the input terminal (208). The input node (225) of the second impedance inverter (202) is coupled to the output node (222) of the first impedance inverter (201), while the output node (226) of the second impedance inverter (202) is coupled (e.g., via a second resonator (205)) to the output terminal (209). The first resonator (203) is coupled between the input terminal (208) and the output terminal (209).

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"Resonator-Type Low-Loss Filters" Y. Sato, O. Ikata, T. Matsuda, and T. Miyashita 1992 International Symposium on SAW Devices for Mobile Communications, Proceedings pp. 179-185.

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