Tunable coupled resonator filter structure
AssigneeQorvo US, Inc.
InventorNadim Khlat
Life of this patent
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Abstract
A tunable coupled resonator filter (CRF) structure is provided. Herein, the tunable CRF structure includes a ferroelectric input shunt resonator, a ferroelectric series resonator, and a ferroelectric output shunt resonator. The tunable CRF structure also includes a coupling layer that is coupled to the ferroelectric input shunt resonator, the ferroelectric series resonator, and the ferroelectric output shunt resonator. In embodiments disclosed herein, the coupling layer can be tuned by a tuning voltage to modify a parallel resonance frequency of the ferroelectric input shunt resonator and the ferroelectric output shunt resonator. As a result, it is possible to dynamically change the parallel resonance frequency of the tunable CRF structure based on various radio frequency (RF) filtering requirements.
Claims18
A tunable coupled resonator filter (CRF) structure comprising:
- a ferroelectric input shunt resonator coupled to an input node and configured to resonate in a parallel resonance frequency;
- a ferroelectric output shunt resonator coupled to an output node and configured to resonate in the parallel resonance frequency;
- a ferroelectric series resonator provided between the ferroelectric input shunt resonator and the ferroelectric output shunt resonator and configured to resonate in a series resonance frequency;
- and
- a ferroelectric coupling layer configured to be polarized relative to the ferroelectric input shunt resonator and the ferroelectric output shunt resonator to thereby modify the parallel resonance frequency to prevent a secondary frequency caused by an electrical-static capacitance of the ferroelectric series resonator from overlapping with the parallel resonance frequency.
An acoustic ladder filter network comprising a plurality of tunable coupled resonator filter (CRF) structures each comprising:
- a ferroelectric input shunt resonator coupled to an input node and configured to resonate in a parallel resonance frequency;
- a ferroelectric output shunt resonator coupled to an output node and configured to resonate in the parallel resonance frequency;
- a ferroelectric series resonator provided between the ferroelectric input shunt resonator and the ferroelectric output shunt resonator and configured to resonate in a series resonance frequency;
- and
- a ferroelectric coupling layer configured to be polarized relative to the ferroelectric input shunt resonator and the ferroelectric output shunt resonator to thereby modify the parallel resonance frequency to prevent a secondary frequency caused by an electrical-static capacitance of the ferroelectric series resonator from overlapping with the parallel resonance frequency.
A wireless device comprising at least one tunable coupled resonator filter (CRF) structure, the at least one tunable CRF structure comprises:
- a ferroelectric input shunt resonator coupled to an input node and configured to resonate in a parallel resonance frequency;
- a ferroelectric output shunt resonator coupled to an output node and configured to resonate in the parallel resonance frequency;
- a ferroelectric series resonator provided between the ferroelectric input shunt resonator and the ferroelectric output shunt resonator and configured to resonate in a series resonance frequency;
- and
- a ferroelectric coupling layer configured to be polarized relative to the ferroelectric input shunt resonator and the ferroelectric output shunt resonator to thereby modify the parallel resonance frequency to prevent a secondary frequency caused by an electrical-static capacitance of the ferroelectric series resonator from overlapping with the parallel resonance frequency.
A method for tuning a parallel resonance frequency in a tunable coupled resonator filter (CRF) structure comprising:
- coupling a ferroelectric input shunt resonator to an input node to resonate in the parallel resonance frequency;
- coupling a ferroelectric output shunt resonator to an output node to resonate in the parallel resonance frequency;
- providing a ferroelectric series resonator between the ferroelectric input shunt resonator and the ferroelectric output shunt resonator to resonate in a series resonance frequency;
- and
- polarizing a ferroelectric coupling layer relative to the ferroelectric input shunt resonator and the ferroelectric output shunt resonator to thereby modify the parallel resonance frequency to prevent a secondary frequency caused by an electrical-static capacitance of the ferroelectric series resonator from overlapping with the parallel resonance frequency.
Dependencies are inferred from the claim text.