Method and apparatus for tuning antennas in a communication device
First Claim
1. A matching network for a communication device having first and second antennas, the matching network comprising:
- a first variable component connectable along a first path between the first antenna and a front end module of the communication device; and
a detector connectable along a second path between the second antenna and the front end module of the communication device, wherein the detector obtains an RF voltage associated with the second path, and wherein the first variable component is adjusted based on derivative information associated with the detected RF voltage to tune the matching network, wherein the derivative information is determined by calculating a finite difference of two sequential measurements associated with reactance settings for the matching network.
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Abstract
A system that incorporates teachings of the present disclosure may include, for example, a matching network for a communication device having first and second antennas, where the matching network includes a first variable component connectable and a detector. The first variable component can be connectable along a first path between the first antenna and a front end module of the communication device, where the first antenna is configured for transmit and receive operation. The detector can be connectable along a second path between the second antenna and the front end module of the communication device, where the detector obtains an RF voltage associated with the second path, where the second antenna is configured for a diversity receive operation, and where the first variable component is adjusted based on the detected RF voltage to tune the matching network. Additional embodiments are disclosed.
356 Citations
18 Claims
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1. A matching network for a communication device having first and second antennas, the matching network comprising:
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a first variable component connectable along a first path between the first antenna and a front end module of the communication device; and a detector connectable along a second path between the second antenna and the front end module of the communication device, wherein the detector obtains an RF voltage associated with the second path, and wherein the first variable component is adjusted based on derivative information associated with the detected RF voltage to tune the matching network, wherein the derivative information is determined by calculating a finite difference of two sequential measurements associated with reactance settings for the matching network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a handset having a transmitter and first and second antennas, the method comprising:
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setting a first tunable capacitor to a first value; setting a second tunable capacitor to a second value; transmitting power from the first antenna; measuring a first response at the second antenna; setting the first tunable capacitor to a third value; measuring a second response at the second antenna; calculating a finite difference with respect to the first tunable capacitor based on the first and second responses; calculating a figure of merit that includes the finite difference; and tuning a matching network based on the figure of merit. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A communication device comprising:
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first and second antennas; a transmitter; a matching network coupled with the transmitter; and a controller coupled with the matching network, wherein the controller performs operations comprising; setting a first tunable capacitor to a first value; setting a second tunable capacitor to a second value; transmitting power from the first antenna; measuring a first response at the second antenna; setting the first tunable capacitor to a third value; measuring a second response at the second antenna; calculating a finite difference with respect to the first tunable capacitor based on the first and second responses; calculating a figure of merit that includes the finite difference; and tuning the matching network based on the figure of merit.
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Specification