| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave filter, in which not only a wide band is realized using a slanted type converter, but also sharpness is enhanced in the transition region of the filter characteristics. SOLUTION: The surface acoustic wave filter 1 comprises a surface wave substrate 2, an input converter 3 formed on one side of the surface wave substrate 2, and an output converter 4. The input converter 3 and the output converter 4 have a plurality of electrode fingers inclined with respect to the direction intersecting the surface wave propagating direction perpendicularly such that the electrode finger pitch is varied in a direction intersecting the surface wave propagating direction perpendicularly. Electrode finger pitch at an I/O converter section, corresponding in the surface wave propagating direction, is made to be different. COPYRIGHT: (C)2005,JPO&NCIPI
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