Title:
SURFACE ACOUSTIC WAVE ELEMENT AND SURFACE ACOUSTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2000/042704
Kind Code:
A1
Abstract:
A surface acoustic wave device the frequency characteristics of which can be flexibly regulated in response to a system request and which can be downsized and enhanced in out-band characteristics, wherein a grounding terminal wired to a comb-teeth-shaped electrode of a 2-port surface acoustic wave element is extended to face the output sides of both input and output signal terminals so as to form a capacitance, and an attenuation region is provided in a frequency band away from a pass band of a surface acoustic wave element by means of a resonance system including the capacitance, whereby it is possible to downsize the device by flip-chip mounting, improve characteristics in a high-frequency band, and solve a problem that an attenuation region cannot be provided in a frequency band away from a pass band due to an inability of forming a resonance system using a bonding wire inductance.
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Inventors:
KURODA YASUSHI (JP)
Application Number:
PCT/JP2000/000107
Publication Date:
July 20, 2000
Filing Date:
January 12, 2000
Export Citation:
Assignee:
TOSHIBA KK (JP)
KURODA YASUSHI (JP)
KURODA YASUSHI (JP)
International Classes:
H03H9/145; H03H9/05; H03H9/10; H03H9/64; H03H3/08; (IPC1-7): H03H9/145; H03H9/25; H03H9/64
Foreign References:
| JPH10107574A | 1998-04-24 | |||
| JPS61139016U | 1986-08-28 | |||
| JPH07154201A | 1995-06-16 | |||
| JPH04234798A | 1992-08-24 | |||
| JPH09172341A | 1997-06-30 |
Other References:
HIROMI YATSUDA: "Modeling of Parasitic Effects for Flip-Chip SAW Filters.", 1997 IEEE ULTRASONICS SYMPOSIUM, vol. 1, 8 June 1998 (1998-06-08), pages 143 - 146, XP002927658
HIROMI KOTSUDA, ET. AL.: "Flip-Chip type GHz band SAW Filter (in Japanese).", TECHNICAL RESEARCH REPORT, THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS (EMD95 16-23), vol. 95, no. 151, 20 July 1995 (1995-07-20), pages 47 - 54, XP002929915
HIROMI YATSUTA: "Research on Wide-Band Surface Acoustic Wave Filter and its Practical Use (in Japanese)", TOHOKU DAIGAKU DENTSU DANWAKAI KIROKU (TOHOKU DAIGAKU DENKI TSUSHIN KENKYUSHO),, vol. 68, no. 1, 28 August 1999 (1999-08-28), pages 150 - 153, XP002929916
See also references of EP 1079521A4
HIROMI KOTSUDA, ET. AL.: "Flip-Chip type GHz band SAW Filter (in Japanese).", TECHNICAL RESEARCH REPORT, THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS (EMD95 16-23), vol. 95, no. 151, 20 July 1995 (1995-07-20), pages 47 - 54, XP002929915
HIROMI YATSUTA: "Research on Wide-Band Surface Acoustic Wave Filter and its Practical Use (in Japanese)", TOHOKU DAIGAKU DENTSU DANWAKAI KIROKU (TOHOKU DAIGAKU DENKI TSUSHIN KENKYUSHO),, vol. 68, no. 1, 28 August 1999 (1999-08-28), pages 150 - 153, XP002929916
See also references of EP 1079521A4
Attorney, Agent or Firm:
Suyama, Saichi (Kandatacho 2-chome Chiyoda-ku, Tokyo, JP)
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