Methods and apparatus to control mutual coupling between antennas
First Claim
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1. A communication device, comprising:
- a first antenna;
a first matching network coupled to the first antenna, the first matching network including a first tunable reactance;
a second antenna;
a second matching network coupled to the second antenna, the second matching network including a second tunable reactance;
a tunable compensation circuit comprising a parasitic antenna element coupled to a tunable reactive circuit, wherein the parasitic antenna element absorbs radiation from the first antenna, the second antenna or both, wherein the radiation absorbed by the tunable compensation circuit, by way of the parasitic antenna element, reduces a mutual coupling between the first antenna and the second antenna;
a first circuit coupled to the first antenna;
a second circuit coupled to the second antenna; and
a controller in communication with the tunable compensation circuit, the first matching network and the second matching network, the first and second circuits, wherein responsive to executing instructions, the controller facilitates performance of operations comprising;
adjusting the first and second tunable reactances to perform impedance matching for the first and second antennas;
facilitating a transmission of a reference signal from the second antenna resulting from connecting the first circuit to the second antenna;
receiving a signal at the first antenna to obtain a received signal, wherein the signal is associated with the reference signal transmitted from the second antenna;
determining a backscatter current from a comparison of the received signal to the reference signal; and
responsive to the backscatter current exceeding a backscatter current threshold;
tuning the tunable compensation circuit by setting a variable impedance or variable circuit configuration of the tunable compensation circuit to reduce the mutual coupling between the first and second antennas,wherein the tuning of the tunable compensation circuit comprises controlling the tunable reactive circuit to adjust a resonant frequency of the parasitic antenna element, thereby reducing the mutual coupling between the first antenna and the second antenna, and is performed responsive to a determination that the adjusting of the first and second tunable reactances satisfies an impedance matching threshold.
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Abstract
A system that incorporates teachings of the subject disclosure may include, for example, a method for comparing a received signal from a first antenna to a reference signal transmitted by a second antenna, determining from the comparison one or more compensation parameters, and tuning a compensation circuit according to the one or more compensation parameters, where the one or more compensations parameters configure the compensation circuit to reduce mutual coupling between the first and second antennas. Other embodiments are disclosed.
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Citations
31 Claims
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1. A communication device, comprising:
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a first antenna; a first matching network coupled to the first antenna, the first matching network including a first tunable reactance; a second antenna; a second matching network coupled to the second antenna, the second matching network including a second tunable reactance; a tunable compensation circuit comprising a parasitic antenna element coupled to a tunable reactive circuit, wherein the parasitic antenna element absorbs radiation from the first antenna, the second antenna or both, wherein the radiation absorbed by the tunable compensation circuit, by way of the parasitic antenna element, reduces a mutual coupling between the first antenna and the second antenna; a first circuit coupled to the first antenna; a second circuit coupled to the second antenna; and a controller in communication with the tunable compensation circuit, the first matching network and the second matching network, the first and second circuits, wherein responsive to executing instructions, the controller facilitates performance of operations comprising; adjusting the first and second tunable reactances to perform impedance matching for the first and second antennas; facilitating a transmission of a reference signal from the second antenna resulting from connecting the first circuit to the second antenna; receiving a signal at the first antenna to obtain a received signal, wherein the signal is associated with the reference signal transmitted from the second antenna; determining a backscatter current from a comparison of the received signal to the reference signal; and responsive to the backscatter current exceeding a backscatter current threshold; tuning the tunable compensation circuit by setting a variable impedance or variable circuit configuration of the tunable compensation circuit to reduce the mutual coupling between the first and second antennas, wherein the tuning of the tunable compensation circuit comprises controlling the tunable reactive circuit to adjust a resonant frequency of the parasitic antenna element, thereby reducing the mutual coupling between the first antenna and the second antenna, and is performed responsive to a determination that the adjusting of the first and second tunable reactances satisfies an impedance matching threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A non-transitory machine-readable storage medium, comprising executable instructions that, when executed by a processor, facilitate performance of operations comprising:
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adjusting a first tunable reactance of a first matching network and a second tunable reactance of a second matching network to perform impedance matching for first and second antennas respectively, wherein the first and second antennas are coupled to first and second transceivers respectively; receiving a signal at the first antenna to obtain a received signal, wherein the signal is associated with a reference signal transmitted by the second antenna resulting from connecting the first transceiver to the second antenna; determining a backscatter signal from a comparison of the received signal to the reference signal; and responsive to the backscatter signal exceeding a backscatter signal threshold; determining from the backscatter signal a compensation parameter; and adjusting a compensation circuit according to the compensation parameter, the compensation circuit comprising a configurable parasitic antenna element coupled to a tunable reactive circuit, wherein the compensation parameter configures the compensation circuit to absorb radiation from the first antenna, the second antenna or both by way of the configurable parasitic antenna element to reduce mutual coupling between the first and second antennas, and wherein the adjusting of the compensation circuit comprises controlling the tunable reactive circuit to adjust a resonant frequency of the configurable parasitic antenna element, thereby reducing the mutual coupling between the first and second antennas, and is performed responsive to a determination that the adjusting of the first and second tunable reactances satisfies an impedance matching threshold. - View Dependent Claims (26, 27)
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28. A method, comprising:
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adjusting, by a system including a processor, a first tunable reactance of a first matching network and a second tunable reactance of a second matching network to perform impedance matching for first and second antennas of a communication device respectively, wherein the first and second antennas are coupled to first and second transceivers respectively; comparing, by the system, a signal received at the first antenna to a reference signal transmitted by the second antenna resulting from connecting the first transceiver to the second antenna, thereby obtaining a backscatter signal, wherein the received signal is associated with the reference signal; and responsive to the backscatter signal exceeding a backscatter signal threshold; determining, by the system, from the backscatter signal a compensation parameter; and tuning, by the system, a compensation circuit according to the compensation parameter, the compensation circuit comprising a parasitic antenna element coupled to a tunable reactive circuit, wherein the compensation parameter configures the compensation circuit to absorb radiation from the first antenna, the second antenna or both by way of the parasitic antenna element to reduce mutual coupling between the first and second antennas, and wherein the tuning of the compensation circuit comprises controlling the tunable reactive circuit to adjust a resonant frequency of the parasitic antenna, thereby reducing the mutual coupling between the first and second antennas, and is performed responsive to a determination that the adjusting of the first and second tunable reactances satisfies an impedance matching threshold. - View Dependent Claims (29, 30, 31)
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Specification