Single-port multi-resonator acoustic resonator device
AssigneeTFR Technologies, Inc.
InventorKenneth Lakin
Life of this patent
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Abstract
A single port multi-resonator acoustic resonator device (200, 300, 400, 490) possesses an input impedance that exhibits precisely designed electrical resonances. The device contains at least three parts: a transducer/resonator (201, 301, 401. 491) used both to interface to an external electrical circuit and to transform electrical energy into mechanical (i.e. acoustic) vibrations (and vice versa), and also function as a resonator; a mechanical (i.e. acoustic) resonator (203, 303, 460, 480) and an acoustic coupler (202, 302, 404, 494) that controls the acoustic interaction between the transducer/resonator and the mechanical resonator.
Claims18
A single-port acoustic resonator device having an input impedance at said port that exhibits at least one electrical resonance within a prescribed frequency band, said prescribed frequency band having a bandwidth that is less than one-half of a central frequency located at the center of said prescribed frequency band, said resonator device comprising:
- a transducer/resonator comprising a layer of piezoelectric material, a first electrode layer comprising an electrically conducting material and a second electrode layer comprising an electrically conducting material, said layer of piezoelectric material being situated between said first electrode layer and said second electrode layer, and said transducer/resonator exhibiting an acoustic resonance within said prescribed frequency band;
- a mechanical resonator comprising at least one layer of a solid acoustically conductive material, said mechanical resonator exhibiting an acoustic resonance within said prescribed frequency band;
- an acoustic coupler, said acoustic coupler comprising at least one layer of a solid acoustically conductive material, said acoustic coupler being physically situated between said transducer/resonator and said mechanical resonator for acoustically coupling said transducer/resonator with said mechanical resonator,
- said transducer/resonator, said acoustic coupler and said mechanical resonator further comprising a stacked integral assembly.
A frequency filter, comprising:
- an input port and an output port and a ground,
- first, second and third acoustic resonator devices connected in series between said input and output ports,
- fourth and fifth resonator devices;
- said fourth resonator device connected to the serial connection between said first and second acoustic resonator devices and extending in shunt thereof to ground;
- said fifth resonator device connected to the serial connection between said second and third acoustic resonator devices and extending in shunt thereof to ground;
- each of said first through fifth acoustic resonator devices, further comprising:
- a single-port acoustic resonator device having an input impedance at said port that exhibits at least one electrical resonance within a prescribed frequency band, said prescribed frequency band having a bandwidth that is less than one-half of a central frequency located at the center of said prescribed frequency band, said acoustic resonator device comprising:
- a transducer/resonator comprising:
- a layer of piezoelectric material,
- a first electrode layer comprising an electrically conducting material and
- a second electrode layer comprising an electrically conducting material,
- said layer of piezoelectric material being situated between said first electrode layer and said second electrode layer, and said transducer/resonator exhibiting an acoustic resonance within said prescribed frequency band;
- a mechanical resonator comprising at least one layer of a solid acoustically conductive material, said mechanical resonator exhibiting an acoustic resonance within said prescribed frequency band;
- an acoustic coupler, said acoustic coupler comprising at least one layer of a solid acoustically conductive material, said acoustic coupler being physically situated between said transducer/resonator and said mechanical resonator for acoustically coupling said transducer/resonator with said mechanical resonator,
- said transducer coupler, said acoustic coupler and said mechanical resonator further comprising a stacked integral assembly.
Dependencies are inferred from the claim text.