Tunable matching network for antenna systems
First Claim
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1. A communication system comprising:
- an antenna;
a matching network coupled to the antenna;
a controller configured to control the matching network;
a look-up table, the look-up table including characterization data according to frequency bands and conditions, wherein the controller is configured to refer to the look-up table to determine an impedance for a frequency band selected and under a condition detected during a time interval, and the controller further configured to adjust the matching network to provide the impedance;
one or more sensors configured to detect the condition during the time interval, wherein the controller receives information on the condition from the one or more sensors and uses the information upon referring to the look-up table;
whereinthe matching network comprises a plurality of cells and a plurality of switches coupled to the plurality of cells, wherein each cell comprises one or more components, and whereinthe controller is configured to adjust the matching network by selectively adjusting one or more of the plurality of switches between an on condition and an off condition to select a current state of the matching network from at least three states of the matching network, the at least three states associated with possible configurations of the plurality of switches of the matching network, the current state being selected to provide an impedance for the frequency band and the condition based on component values of one or more of the plurality of cells coupled to the one or more of the plurality of switches that are turned on, the component values having been selected based on parasitic effects to provide a linear impedance behavior with respect to the at least three states associated with possible configurations of the plurality of switches of the matching network.
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Abstract
A communication system is provided, including an antenna, a matching network coupled to the antenna, a controller configured to control the matching network, and a look-up table coupled to the controller. The look-up table includes characterization data according to frequency bands and conditions. The controller is configured to refer to the look-up table to determine optimum impedance for a frequency band selected under a condition detected during a time interval, and adjust the matching network to provide the optimum impedance.
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Citations
12 Claims
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1. A communication system comprising:
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an antenna; a matching network coupled to the antenna; a controller configured to control the matching network; a look-up table, the look-up table including characterization data according to frequency bands and conditions, wherein the controller is configured to refer to the look-up table to determine an impedance for a frequency band selected and under a condition detected during a time interval, and the controller further configured to adjust the matching network to provide the impedance; one or more sensors configured to detect the condition during the time interval, wherein the controller receives information on the condition from the one or more sensors and uses the information upon referring to the look-up table; wherein the matching network comprises a plurality of cells and a plurality of switches coupled to the plurality of cells, wherein each cell comprises one or more components, and wherein the controller is configured to adjust the matching network by selectively adjusting one or more of the plurality of switches between an on condition and an off condition to select a current state of the matching network from at least three states of the matching network, the at least three states associated with possible configurations of the plurality of switches of the matching network, the current state being selected to provide an impedance for the frequency band and the condition based on component values of one or more of the plurality of cells coupled to the one or more of the plurality of switches that are turned on, the component values having been selected based on parasitic effects to provide a linear impedance behavior with respect to the at least three states associated with possible configurations of the plurality of switches of the matching network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification