Filter using enhanced quality factor resonator and method

Details Filter using enhanced quality factor resonator and method Filter using enhanced quality factor resonator and method

1995-06-29

1997-04-01

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310321, 333187, H03H 900

Patent

active

056170653

ABSTRACT:
A filter (500) including a first resonator (505) coupled in shunt with a first port (507), a first bridging network (510) coupled between the first port (507) and a first node (509), a second resonator (515) coupled in shunt with the first node (509) and a second port (547) coupled to the first node (509). The first (505) and second (515) resonators each include acoustic resonators (15) and the first bridging network (510) has an electrical length .THETA. at a frequency .omega. in a system having a characteristic admittance Y in accordance with .omega.C.sub.o =Ycot.THETA. where C.sub.o is a shunt capacitance including the clamping capacitance of the first resonator (505) and .omega. is a center frequency of the filter (500).

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