Title:
SURFACE ACOUSTIC WAVE FILTER, AND COMMUNICATION EQUIPMENT USING THE SAME
Document Type and Number:
Japanese Patent JP3414384
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a ladder-type surface acoustic wave filter wherein its desired frequency adjustment can be performed by the one-time deposition of its insulation film, without narrowing its frequency band.
SOLUTION: When the wavelength of one terminal surface acoustic wave resonator is called λ, and the line width of a comb-type electrodes is called W, the ladder-type surface acoustic wave filter, the electrode-duty of the one terminal pair surface acoustic wave resonator defined by the formula, electrode duty = 2×W/λ, is made larger in the parallel-arm resonator than in the series- arm resonator.
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Inventors:
Toshiaki Takada
Application Number:
JP2001005644A
Publication Date:
June 09, 2003
Filing Date:
January 12, 2001
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H03H9/145; H03H9/64; H03H3/08; H03H9/02; (IPC1-7): H03H9/64; H03H9/145
Domestic Patent References:
| JP2000196409A | ||||
| JP11234085A | ||||
| JP9121136A | ||||
| JP7307640A | ||||
| JP9214285A | ||||
| JP8321743U |