Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1995-05-26
1997-02-04
Lee, Benny
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313B, 310313D, H03H 964
Patent
active
056002874
ABSTRACT:
A method and apparatus for an acoustic wave filter (110) with reduced bulk-wave scattering loss and a ladder filter (30, 40) incorporating same. The method includes steps of providing an acoustic wave propagating substrate (111) and disposing a first reflector (112) on a first surface thereof. The method also includes disposing a first transducer (115) to a first side of the first reflector (112). The first transducer (115) is separated from the first reflector (112) by a first gap (118) having a first width (114) exceeding one-fourth of the acoustic wavelength. The method also includes disposing a second reflector (112') to a side of the first transducer (115) opposite the first reflector (112). The first (112) and second (112') reflectors each include a group of periodically disposed reflective elements (113, 113'). The second reflector (112') is separated from the first transducer (115) by a second gap (140) having a second width (139). The method also includes disposing a first waveguiding element (116) having a first breadth (117) within the first gap (118).
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"A Fast Green's Function Method For Calculating Bulk Wave Frequency Responses From Saw Frequency Responses", by K. C. Wagner and O. Manner, from Siemens AG, Central Research Laboratories, Munich, Germany, Siemens AG Austria, ETG 323, Vienna, Austria 1990 IEEE.
Hickernell Thomas S.
Kwan Philip P.
Penunuri David
Fliegel Frederick M.
Gambino Darius
Lee Benny
Motorola Inc.
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