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US 12,658,890 B2Granted
Ladder-type filter, and duplexer and modules with ladder-type filter
AssigneeSanan Japan Technology Corporation
InventorsHitoshi Ebihara, Shinichi Shioi
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Abstract
A ladder-type filter includes a plurality of series arms and a plurality of parallel arms, in which one of the parallel arms does not have resonance characteristic is arranged in parallel between two series arm resonators of the plurality of series arms. The ladder-type filter may be included in a duplexer and/or a module.
Claims8
A ladder-type filter comprising:
- a plurality of series arms;
- a plurality of parallel arms;
- and
- a support substrate,
- wherein one of the plurality of the parallel arms is arranged in parallel between two series arm resonators of the plurality of series arms and does not have resonance properties,
- wherein the plurality of series arms and the plurality of parallel arms are formed on a piezoelectric substrate that is formed of a piezoelectric single crystal of lithium tantalate or lithium niobite,
- wherein the plurality of series arms and the plurality of parallel arms are formed on a main surface on the piezoelectric substrate,
- wherein the support substrate is mounted on a surface opposite of the main surface of the piezoelectric substrate, and
- wherein the support substrate comprises a substrate formed of sapphire, silicon, alumina, spinel, quartz or glass.
6 more elements
Dependencies are inferred from the claim text.