Adaptive matching network
First Claim
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1. A communication device, comprising:
- an antenna;
a transceiver coupled with the antenna;
a matching network coupled to the transceiver by an input port, the matching network comprising an output port connected to the antenna, and a variable reactance element;
a radio frequency (RF) measurement circuit connected to the input port of the matching network and to the transceiver; and
a control circuit coupled to the matching network and the RF measurement circuit,wherein the control circuit measures forward and reverse waves via the RF measurement circuit and determines reflection coefficient information,wherein the control circuit performs an impedance tuning process by adjusting a reactance of the variable reactance element according to the measurements to optimize a return loss, andwherein the impedance tuning process determines new reflection coefficient information and uses the new reflection coefficient information to identify an optimal tuning state.
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Abstract
A system that incorporates teachings of the present disclosure can include, for example, an apparatus having a matching network adapted to reduce a magnitude of a signal reflection at a port of the matching network. The matching network can have one or more controllable variable reactive elements. A controller can be adapted to determine reflection coefficient information from incident and reflected waves sampled at the port of the matching network, and follow at least one cycle of a coarse tune process for generating one or more control signals to tune one or more reactances of the one or more controllable variable reactive elements. Additional embodiments are disclosed.
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Citations
20 Claims
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1. A communication device, comprising:
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an antenna; a transceiver coupled with the antenna; a matching network coupled to the transceiver by an input port, the matching network comprising an output port connected to the antenna, and a variable reactance element; a radio frequency (RF) measurement circuit connected to the input port of the matching network and to the transceiver; and a control circuit coupled to the matching network and the RF measurement circuit, wherein the control circuit measures forward and reverse waves via the RF measurement circuit and determines reflection coefficient information, wherein the control circuit performs an impedance tuning process by adjusting a reactance of the variable reactance element according to the measurements to optimize a return loss, and wherein the impedance tuning process determines new reflection coefficient information and uses the new reflection coefficient information to identify an optimal tuning state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus, comprising:
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a memory that stores instructions; and a control circuit coupled with the memory, wherein the control circuit, responsive to executing the instructions, performs operations comprising; obtaining measurements via a radio frequency (RF) measurement circuit that samples forward and reverse waves at a RF input port of a matching network of a communication device; and adjusting the matching network to perform an impedance tuning process by adjusting a reactance of a variable reactance element of the matching network according to the measurements to reduce a return loss, wherein the return loss is proportional to a difference between a calibration factor and a difference between the forward and reverse waves. - View Dependent Claims (15, 16, 17, 18)
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19. A method, comprising:
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obtaining, by a control circuit of a communication device, measurements via a radio frequency (RF) measurement circuit that samples forward and reverse waves at a RF input port of a matching network of the communication device; determining, by the control circuit, reflection coefficient information from the measurements; adjusting, by the control circuit, the matching network to perform an impedance tuning process by adjusting a reactance of a variable reactance element of the matching network according to the measurements, wherein a look-up table is used to perform the impedance tuning process; and determining new reflection coefficient information to optimize a return loss and using the new reflection coefficient information to identify an optimal tuning state. - View Dependent Claims (20)
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Specification