Tunable matching circuit
First Claim
Patent Images
1. A communication device comprising:
- a capacitive element and an inductive element arranged as a matching circuit, the matching circuit having an impedance;
a ferro-electric material positioned to adjust a value that is a member of the group consisting of a capacitance value of the capacitive element and an inductance value of the inductive element;
a control line operably connected to the ferro-electric material;
a control source electrically connected to the control line, the control source configured to transmit a control signal on the control line;
wherein the ferro-electric material, responsive to the control signal, adjusts the value to chance the impedance of the matching circuit; and
wherein the quality factor of the matching circuit, when operated in a temperature range between about −
50 degrees Celsius and 100 degrees Celsius, is greater than about 80 in a frequency range between 0.25 GHz and 7.0 GHz.
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Abstract
The present invention provides for low loss tunable matching circuits at rf frequencies. Ferro-electric materials are used to produce low loss tunable capacitors and inductors for use in matching circuits.
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Citations
14 Claims
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1. A communication device comprising:
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a capacitive element and an inductive element arranged as a matching circuit, the matching circuit having an impedance;
a ferro-electric material positioned to adjust a value that is a member of the group consisting of a capacitance value of the capacitive element and an inductance value of the inductive element;
a control line operably connected to the ferro-electric material;
a control source electrically connected to the control line, the control source configured to transmit a control signal on the control line;
wherein the ferro-electric material, responsive to the control signal, adjusts the value to chance the impedance of the matching circuit; and
wherein the quality factor of the matching circuit, when operated in a temperature range between about −
50 degrees Celsius and 100 degrees Celsius, is greater than about 80 in a frequency range between 0.25 GHz and 7.0 GHz.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A communication device comprising:
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a capacitive element and an inductive element arranged as a matching circuit, the matching circuit having an impedance;
a ferro-electric material positioned to adjust a value that is a member of the group consisting of a capacitance value of the capacitive element and an inductance value of the inductive element;
a control line operably connected to the ferro-electric material;
a control source electrically connected to the control line, the control source configured to transmit a control signal on the control line;
wherein;
the ferro-electric material, responsive to the control signal, adjusts the value to change the impedance of the matching circuit, and the control signal comprises a direct current voltage;
the control source is coupled to a band select signal, the band select signal comprising a signal identifying a band in which the matching circuit is to operate; and
the control source comprises;
a lookup table comprising a number representing the direct current voltage value corresponding to the band in which the matching circuit is to operate; and
a voltage source for generating the direct current voltage responsive to the number representing the direct current voltage value.
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12. A communication device comprising:
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a capacitive element and an inductive element arranged as a matching circuit, the matching circuit having an impedance;
a ferro-electric material positioned to adjust a value that is a member of the group consisting of a capacitance value of the capacitive element and an inductance value of the inductive element;
a control line operably connected to the ferro-electric material;
a control source electrically connected to the control line, the control source configured to transmit a control signal on the control line;
wherein the ferro-electric material, responsive to the control signal, adjusts the value to change the impedance of the matching circuit, and wherein the control source comprises a power detector which detects a power level of an RF signal and varics the control signal responsive to the power level of the RF signal.
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13. A communication device comprising:
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a capacitive element and an inductive element arranged as a matching circuit, the matching circuit having an impedance;
a ferro-electric material positioned to adjust a value that is a member of the group consisting of a capacitance value of the capacitive element and an inductance value of the inductive element;
a control line operably connected to the ferro-electric material;
a control source electrically connected to the control line, the control source configured to transmit a control signal on the control line;
an antenna coupled to a first port of the matching circuit; and
a duplexer coupled to a second port of the matching circuit, and wherein the ferro-electric material, responsive to the control signal, adjusts the value to change the impedance of the matching circuit.
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14. A communication device comprising:
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a capacitive element end an inductive element arranged as a matching circuit, the matching circuit having an impedance;
a ferro-electric material positioned to adjust a value that is a member of the group consisting of a capacitance value of the capacitive element and an inductance value of the inductive element;
a control line operably connected to the ferro-electric material;
a control source electrically connected to the control line, the control source configured to transmit a control signal on the control line;
an antenna coupled to a first port of the matching circuit; and
a diplexer coupled to a second port of the matching circuit, and wherein the ferro-electric material, responsive to the control signal, adjusts the value to change the impedance of the matching circuit.
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Specification