Surface acoustic wave filter
AssigneeFujitsu Limited
InventorsJun Tsutsumi, Shogo Inoue, Takashi Matsuda, Osamu Ikata
Life of this patent
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Abstract
A surface acoustic wave filter has, on a piezoelectric substrate, surface acoustic wave resonators each composed of an interdigital transducer and reflectors disposed on both sides of the interdigital transducer. The surface acoustic wave resonators are arranged in series arms and in parallel arms to be connected in a ladder form. At least one of the surface acoustic wave resonators is replaced with an interdigital transducer that does not involve resonance in a propagation direction of a surface acoustic wave.
Claims6
A surface acoustic wave filter comprising surface acoustic wave resonators each composed of an interdigital transducer and reflectors disposed on both sides of the interdigital transducer, the surface acoustic wave resonators being arranged in series arms and in parallel arms to be connected in a ladder form on a piezoelectric substrate,
- wherein at least one of the surface acoustic wave resonators is replaced with an interdigital transducer that does not involve resonance in a propagation direction of a surface acoustic wave.
A surface acoustic wave filter comprising:
- a piezoelectric substrate;
- and
- a plurality of surface acoustic wave resonators and at least one interdigital transducer that does not involve resonance, the surface acoustic wave resonators and the interdigital transducer being formed on the piezoelectric substrate and connected in a ladder form,
- wherein the surface acoustic wave resonators are each composed of an interdigital transducer and reflectors disposed on both sides of the interdigital transducer in a direction parallel to a propagation direction of a surface acoustic wave, and
- the interdigital transducer that does not involve the resonance is formed of split electrodes.
Dependencies are inferred from the claim text.