ELASTIC SURFACE WAVE APPARATUS - FUJITSU MEDIA DEVICES LTD

Title:

ELASTIC SURFACE WAVE APPARATUS

Document Type and Number:

WIPO Patent Application WO/2003/073610

Kind Code:

A1

Abstract:

An elastic surface wave apparatus includes a substrate (10), a pair of reflection electrodes (14, 18) formed on the substrate, and a plurality of drive electrodes (12) formed so as to be sandwiched by the pair of reflection electrodes. Cycle of each of the reflection electrodes changes according to a predetermined change pattern. Thus, it is possible to simultaneously improve suppression of spurious wave and squareness characteristics (precipitous shoulder portion of a passing zone).

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Inventors:

KAWACHI OSAMU (JP)
ORITO SATOSHI (JP)
ABE TAKUYA (JP)

Application Number:

PCT/JP2003/001166

Publication Date:

September 04, 2003

Filing Date:

February 05, 2003

Export Citation:

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Assignee:

FUJITSU MEDIA DEVICES LTD (JP)
KAWACHI OSAMU (JP)
ORITO SATOSHI (JP)
ABE TAKUYA (JP)

International Classes:

H01L41/18; H03H3/08; H03H9/00; H03H9/02; H03H9/145; H01L41/09; H03H9/25; H03H9/64; (IPC1-7): H03H9/145; H03H9/25; H03H9/64; H01L41/09; H01L41/18

Foreign References:

JP2001332954A	2001-11-30
JPS62199111A	1987-09-02
JP2001332954A	2001-11-30
DE4126335A1	1993-02-18
US5270606A	1993-12-14
US5760664A	1998-06-02
JPH1032462A	1998-02-03
EP1003286A2	2000-05-24

Other References:

P.S. CROSS: "IEEE ULTRASONICS SYMPOSIUM", 26 October 1977, PROCEEDINGS, article "Surface Acoustic Wave Resonator-Filters Using Tapered Gratings", pages: 895 - 899
MULLER G ET AL.: "IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES", vol. 41, 1 December 1993, IEEE SERVICE CENTER, article "DESIGN OF A LOW LOSS SAW REFLECTOR FILTER WITH EXTREMELY WIDE BANDWIDTH FOR MOBILE COMMUNICATION SYSTEMS", pages: 2147 - 2155
See also references of EP 1480336A4

Attorney, Agent or Firm:

Katayama, Shuhei (6-1 Kyobashi 1-chom, Chuo-ku Tokyo, JP)

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