Surface acoustic wave filter devices
AssigneeAiroha Technology Corp.
InventorCHIN-LUNG YANG
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Abstract
The present invention relates to a surface acoustic wave filter device with floating units. The surface acoustic wave filter device comprises a piezoelectric substrate, at least one interdigitated transducer configuration and at least one floating unit. The interdigitated transducer configuration comprises a plurality of interdigitated transducer units disposed on the piezoelectric substrate. The floating unit is disposed between adjacent interdigitated transducer units, and covers partial region of adjacent interdigitated transducer units to reduce the BAW scattering of the surface acoustic wave filter device, and can be used to improve the amplitude and phase balances of the surface acoustic wave filter devices.
Claims15
A surface acoustic wave filter device, comprising:
- a piezoelectric substrate;
- at least one interdigitated transducer configuration comprising a plurality of interdigitated transducer units arranged on said piezoelectric substrate in order;
- and
- at least one floating unit disposed between adjacent interdigitated transducer units to cover partial range of adjacent interdigitated transducer units.
A surface acoustic wave filter device, comprising:
- a piezoelectric substrate;
- a plurality of interdigitated transducer configurations comprising a plurality of interdigitated transducer units arranged on said piezoelectric substrate along a first direction in order, wherein said a plurality of interdigitated transducer configurations are arranged on said piezoelectric substrate along a second direction in order, and said first direction is perpendicular to said second direction;
- and
- a plurality of floating plates disposed between adjacent interdigitated transducer units to cover partial range of adjacent interdigitated transducer units.
Dependencies are inferred from the claim text.