Electrode structure null of serial arm resonator of surface acoustic wave filter for very high frequency

摘要

PROBLEM TO BE SOLVED: To improve a frequency characteristic and also to prevent electrostatic destruction by adjusting an interval in a boundary part of a grating reflector (ground) and a comb-shaped electrode. ;SOLUTION: An electrode structure of a serial arm resonator of an acoustic wave filter of a ladder circuit configuration which has a dual mode resonance characteristic is provided with a comb-shaped electrode 7 which is formed on a piezo-electric substrate 1 and also is formed by interlocking an interdigital electrode 8 that is connected to an input terminal with an interdigital electrode 9 that is connected to an output terminal and grating reflectors 10 which are arranged at both sides of the electrode 7. The intervals of the outermost electrode fingers of the electrode 7 and the electrode fingers of the reflectors 10 which face the electrode fingers are adjusted.;COPYRIGHT: (C)1999,JPO