RF filter structure for antenna diversity and beam forming
First Claim
1. Radio frequency (RF) front-end circuitry, comprising:
- an RF filter structure comprising;
a first terminal, a second terminal, and a third terminal;
a plurality of resonators;
a first tunable RF filter path defined by a first set of the plurality of resonators such that the first tunable RF filter path has a first amplitude and a first phase and the first tunable RF filter path is connected between the first terminal and the second terminal;
a second tunable RF filter path defined by a second set of the plurality of resonators such that the second tunable RF filter path has a second amplitude and a second phase and the second tunable RF filter path is connected between the first terminal and the third terminal, wherein the first set of the plurality of resonators and the second set of the plurality of resonators both include a first resonator of the plurality of resonators, wherein the first resonator is coupled to the first terminal, the first resonator being coupled in the first tunable RF filter path and the second tunable RF filter path so as to operate as a splitter between the first tunable RF filter path and the second tunable RF filter path; and
control circuitry configured to set a first amplitude difference between the first amplitude and the second amplitude to approximately a first target amplitude difference and set a phase difference between the first phase and the second phase to approximately a first target phase difference.
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Accused Products
Abstract
Radio frequency (RF) front-end circuitry that includes control circuitry and an RF filter structure that includes a plurality of resonators are disclosed. In one embodiment, a first tunable RF filter path is defined by a first set of the plurality of resonators such that the first tunable RF filter path has a first amplitude and a first phase. A second tunable RF filter path is defined by a second set of the plurality of resonators such that the second tunable RF filter path has a second amplitude and a second phase. To provide antenna diversity and/or beam forming/beam steering, the control circuitry is configured to set a first amplitude difference between the first amplitude and the second amplitude to approximately a first target amplitude difference and set a first phase difference between the first phase and the second phase to approximately a first target phase difference.
136 Citations
27 Claims
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1. Radio frequency (RF) front-end circuitry, comprising:
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an RF filter structure comprising; a first terminal, a second terminal, and a third terminal; a plurality of resonators; a first tunable RF filter path defined by a first set of the plurality of resonators such that the first tunable RF filter path has a first amplitude and a first phase and the first tunable RF filter path is connected between the first terminal and the second terminal; a second tunable RF filter path defined by a second set of the plurality of resonators such that the second tunable RF filter path has a second amplitude and a second phase and the second tunable RF filter path is connected between the first terminal and the third terminal, wherein the first set of the plurality of resonators and the second set of the plurality of resonators both include a first resonator of the plurality of resonators, wherein the first resonator is coupled to the first terminal, the first resonator being coupled in the first tunable RF filter path and the second tunable RF filter path so as to operate as a splitter between the first tunable RF filter path and the second tunable RF filter path; and control circuitry configured to set a first amplitude difference between the first amplitude and the second amplitude to approximately a first target amplitude difference and set a phase difference between the first phase and the second phase to approximately a first target phase difference.
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2. Radio frequency (RF) front-end circuitry, comprising:
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an RF filter structure comprising; a plurality of resonators; a first tunable RF filter path defined by a first set of the plurality of resonators such that the first tunable RF filter path has a first amplitude and a first phase; a second tunable RF filter path defined by a second set of the plurality of resonators such that the second tunable RF filter path has a second amplitude and a second phase; a third tunable RF filter path defined by a third set of the plurality of resonators such that the third tunable RF filter path has a third amplitude and a third phase; and control circuitry configured to set a first amplitude difference between the first amplitude and the second amplitude to approximately a first target amplitude difference and set a first phase difference between the first phase and the second phase to approximately a first target phase difference. - View Dependent Claims (3, 4)
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5. Radio frequency (RF) front-end circuitry, comprising:
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an RF filter structure comprising; a plurality of resonators; a first tunable RF filter path defined by a first set of the plurality of resonators such that the first tunable RF filter path has a first amplitude and a first phase, wherein a first subset of the first tunable RF filter path comprises a first pair of the first set of the plurality of resonators within a first segment of the first tunable RF filter path and a second subset of the first tunable RF filter path comprises a second pair of the first set of the plurality of resonators within a second segment of the first tunable RF filter path; a second RF tunable filter path defined by a second set of the plurality of resonators such that the second tunable RF filter path has a second amplitude and a second phase; a first cross-coupling capacitive structure electrically connected between the first pair of the first set of the plurality of resonators within the first segment of the first tunable RF filter path such that the first cross-coupling capacitive structure provides a first variable electric coupling coefficient between the first pair of the first set of the plurality of resonators; and a second cross-coupling capacitive structure electrically connected between the second pair of the first set of the plurality of resonators within the second segment of the first tunable RF filter path such that the second cross-coupling capacitive structure provides a second variable electric coupling coefficient between the second pair of the first set of the plurality of resonators; and control circuitry configured to set a first amplitude difference between the first amplitude and the second amplitude to approximately a first target amplitude difference and set a first phase difference between the first phase and the second phase to approximately a first target phase difference. - View Dependent Claims (6)
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7. Radio frequency (RF) front-end circuitry, comprising:
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an RF filter structure comprising; a plurality of resonators; a first tunable RF filter path defined by a first set of the plurality of resonators such that the first tunable RF filter path has a first amplitude and a first phase, wherein at least a first pair of the first set of the plurality of resonators are weakly coupled to one another; a second tunable RF filter path defined by a second set of the plurality of resonators such that the second tunable RF filter path has a second amplitude and a second phase, wherein at least a second pair of the second set of the plurality of resonators are weakly coupled to one another, and the first set of the plurality of resonators and the second set of the plurality of resonators are not mutually exclusive; and control circuitry configured to set a first amplitude difference between the first amplitude and the second amplitude to approximately a first target amplitude difference and set a first phase difference between the first phase and the second phase to approximately a first target phase difference. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification