Surface acoustic wave filter
First Claim
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1. A surface acoustic wave filter comprising:
- a piezoelectric substrate;
a plurality of interdigital transducers formed on said piezoelectric substrate and arranged along a surface wave propagation direction, said plurality of interdigital transducers forming a surface acoustic wave filter part having input and output sides and a pass band; and
a one-port SAW resonator which is not located along said surface wave propagation direction and which has at least one interdigital transducer, said one-port SAW resonator being connected in series with one of said input and output sides of said surface acoustic wave filter part, an antiresonance frequency of said one-port SAW resonator being set at a frequency level higher than said pass band of the surface acoustic wave filter part.
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Abstract
A surface acoustic wave (SAW) filter includes a plurality of interdigital transducers located on a piezoelectric substrate along a surface wave propagation direction, at least a single one-port SAW resonator connected in series with an output side of the SAW filter, while the resonance frequency of the SAW resonator is set at a level which is higher than the passband of the SAW filter.
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Citations
22 Claims
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1. A surface acoustic wave filter comprising:
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a piezoelectric substrate; a plurality of interdigital transducers formed on said piezoelectric substrate and arranged along a surface wave propagation direction, said plurality of interdigital transducers forming a surface acoustic wave filter part having input and output sides and a pass band; and a one-port SAW resonator which is not located along said surface wave propagation direction and which has at least one interdigital transducer, said one-port SAW resonator being connected in series with one of said input and output sides of said surface acoustic wave filter part, an antiresonance frequency of said one-port SAW resonator being set at a frequency level higher than said pass band of the surface acoustic wave filter part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A surface acoustic wave filter, comprising:
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a piezoelectric substrate; a surface acoustic wave filter part provided on said piezoelectric substrate and having input and output sides and a pass band, said surface acoustic wave filter part including a plurality of interdigital transducers and a pair of reflectors located on respective sides of said plurality of interdigital transducers and along a surface wave propagation direction of said plurality of interdigital transducers; a one-port SAW resonator which is not located along said surface wave propagation direction and which has at least one interdigital transducer, said one-port SAW resonator being connected in series with one of said input and output sides of said surface acoustic wave filter part, an antiresonance frequency of said one-port SAW resonator being set at a frequency level higher than said pass band of said surface acoustic wave filter part. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification