Surface acoustic wave filter devices
AssigneeAiroha Technology Corp.
InventorChin-Lung Yang
Life of this patent
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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.
Claims13
A surface acoustic wave filter device, comprising:
- a piezoelectric substrate;
- at least one interdigitated transducer configuration including a plurality of interdigitated transducer units arranged on said piezoelectric substrate in order, each of said interdigitated transducer units defining a plurality of electrode fingers;
- and
- at least one floating unit disposed between adjacent interdigitated transducer units to partially cover each of said adjacent interdigitated transducer units;
- wherein said floating unit extends to fully overlap at least one electrode finger of each said adjacent interdigitated transducer unit partially covered thereby.
A surface acoustic wave filter device, comprising:
- a piezoelectric substrate;
- a plurality of interdigitated transducer configurations, at least one of said interdigitated transducer configurations including a plurality of interdigitated transducer units arranged on said piezoelectric substrate along a first direction in order, each of said interdigitated transducer units defining a plurality of electrode fingers, wherein said 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 each disposed between adjacent ones of said interdigitated transducer units to partially cover each of said adjacent interdigitated transducer units;
- wherein each said floating plate extends to fully overlap at least one electrode finger of each said adjacent interdigitated transducer unit partially covered thereby.
Dependencies are inferred from the claim text.