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Title:
SURFACE ACOUSTIC WAVE FILTER
Document Type and Number:
Japanese Patent JP2001044791
Kind Code:
A
Abstract:

To provide a surface acoustic wave filter with a excellent filter characteristic within a pass band.

This surface acoustic wave filter is provided with a substrate 1 that propagates a surface acoustic wave, an input use comb-like electrode 2 that excites a surface acoustic wave on a surface of the substrate 1, an output use comb-like electrode 3 that receives the surface acoustic wave propagated on the surface of the substrate 1, a 1st shield electrode 4 and a 2nd shield electrode 5 that are independently grounded, are placed on a path of the surface acoustic wave propagated on the surface of the substrate 1 to shield direct electric coupling between the input use comb-like electrode 2 and the output use comb-like electrode 3. Each of the shield electrode is provided with a plurality of short-circuit electrode fingers that are placed in parallel in an orthogonal direction to a propagation direction of the surface acoustic wave so that the intensity of the reflected wave caused on each end face of each short-circuit electrode finger can be reduced by the interference among the reflected waves.


Inventors:
KAN SHIYUNUN
Application Number:
JP1999000218805
Publication Date:
February 16, 2001
Filing Date:
August 02, 1999
Export Citation:
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Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
H03H9/145; H03H9/64; (IPC1-7): H03H9/145; H03H9/64
Attorney, Agent or Firm:
Yoshio Kosugi (1 person outside)