Bulk acoustic wave filter with a roughened substrate bottom...

Details Bulk acoustic wave filter with a roughened substrate bottom... Bulk acoustic wave filter with a roughened substrate bottom...

2005-09-13

2005-09-13

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S189000, C333S191000, C310S327000, C029S025350

Reexamination Certificate

active

06943647

ABSTRACT:
A filter device comprises a substrate having a top surface and a bottom surface, and at least one acoustic wave situated on the top surface of the substrate, wherein the bottom surface of the substrate is roughened to reduce the reflection of an acoustic wave back to the acoustic wave filter. The effect achieved by the roughening of the bottom surface of the substrate that an acoustic wave which is generated by the acoustic wave filter and reaches the bottom surface of the substrate, is basically scattered so the acoustic wave that is actually reflected back to the acoustic wave device is reduced which, in turn, improves the performance characteristics of the acoustic wave filter.

REFERENCES:
patent: 4163201 (1979-07-01), Takahashi et al.
patent: 5708402 (1998-01-01), Hachisu et al.
patent: 5864261 (1999-01-01), Weber
patent: 5903087 (1999-05-01), Mattson et al.
patent: 6150703 (2000-11-01), Cushman et al.
patent: 6466105 (2002-10-01), Lobl et al.
patent: 6603241 (2003-08-01), Barber et al.
patent: 6693500 (2004-02-01), Yang et al.
patent: 6720844 (2004-04-01), Lakin
patent: 2242814 (1975-03-01), None
patent: 2261654 (1975-09-01), None
patent: 2370387 (1978-06-01), None
patent: WO 2004/025832 (2004-03-01), None
J. Kaitila et al.; “ZnO Based Thin Film Bulk Acoustic Wave Filters for EGSM Band”, 2001 IEEE Ultrasonics Symposium, vol. 1, pp. 803-806, Oct., 2001.
Yoon Giwan et al.; “Fabrication of ZnO-based film bulk acoustic resonator devices using W/SiO2 multilayer reflector” Electronics Letters, vol. 36 No. 16.

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