Acoustic wave filter with reduced bulk-wave scattering loss, lad

Wave transmission lines and networks – Coupling networks – Electromechanical filter

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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).

REFERENCES:
patent: 3886505 (1975-05-01), Hartman et al.
patent: 4065735 (1977-12-01), Palfreeman et al.
patent: 4072915 (1978-02-01), Mitchell
patent: 4166258 (1979-08-01), Tseng
patent: 4237433 (1980-12-01), Tanski
patent: 4255726 (1981-03-01), Kinoshita et al.
patent: 4303897 (1981-12-01), Augst
patent: 4340834 (1982-07-01), Sato
patent: 4468642 (1984-08-01), Hikita
patent: 4577168 (1986-03-01), Hartmann
patent: 4599587 (1986-07-01), Hartmann et al.
patent: 4625208 (1986-11-01), Skeie et al.
patent: 4635009 (1987-01-01), Ebata
patent: 4642506 (1987-02-01), Lewis
patent: 4694266 (1987-09-01), Wright
patent: 4734664 (1988-03-01), Hikita et al.
patent: 4742319 (1988-05-01), Sone
patent: 4760360 (1988-07-01), Grassl et al.
patent: 4803449 (1989-02-01), Hikita et al.
patent: 4837476 (1989-06-01), Mochizuki
patent: 4954793 (1990-09-01), Misu et al.
patent: 4965479 (1990-10-01), Elliott et al.
patent: 5051644 (1991-09-01), Wright
patent: 5061871 (1991-10-01), Wright
patent: 5115216 (1992-05-01), Hikita et al.
patent: 5130597 (1992-07-01), Mariani
patent: 5274345 (1993-12-01), Gau
patent: 5351022 (1994-09-01), Ruile et al.
patent: 5363073 (1994-11-01), Higgins
patent: 5392013 (1995-02-01), Yamamoto et al.
patent: 5434466 (1995-07-01), Hickernell et al.
"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.

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