Saw resonator having transverse mode ripple at antiresonance point
AssigneeMurata Manufacturing Co., Ltd.
InventorsKazuhiko Morozumi, Michio Kadota
Life of this patent
Estimating the term…
Abstract
A SAW resonator for forming a frequency trap has a surface wave substrate and at least one interdigital transducer located on the surface wave substrate. The interdigital transducer includes a pair of comb-shaped electrodes each having a plurality of electrode fingers arranged so that the pair of comb-shaped electrodes interdigitates with each other. An overlapping width of the electrode fingers of the interdigital transducer is set such that in an impedance-frequency characteristic a transverse mode ripple occurring between a resonance point and an antiresonance point is located at the antiresonance point.
Claims5
A SAW resonator comprising:
- a surface wave substrate;
- at least one interdigital transducer located on the surface wave substrate, the interdigital transducer including a pair of comb-shaped electrodes each having a plurality of electrode fingers arranged so that the pair of comb-shaped electrodes interdigitates with each other;
- wherein
- an overlapping width of the electrode fingers of the interdigital transducer causes a transverse mode ripple, occurring between or adjacent to a resonance point and an antiresonance point, to be located substantially at the antiresonance point in such a manner that a peak point of the antiresonance point is dulled.
Dependencies are inferred from the claim text.