System and method for a tunable impedance matching network
First Claim
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1. A system for impedance matching in a wireless device, comprising:
- signaling circuitry coupled to an antenna and configured to receive a signal at a first frequency and transmit a signal at a second frequency;
impedance matching circuitry coupled to the signaling circuitry and having a plurality of tunable elements for matching an impedance of the first and second frequencies with an impedance of the antenna;
a memory containing a plurality of values associated with the tunable elements, wherein each value corresponds to a state of the signaling circuitry and is defined to configure the associated tunable element for impedance matching at both the first and second frequencies when the signaling circuitry is in the corresponding state; and
a controller configured to obtain a current state of the signaling circuitry and a current state of a physical property of the wireless device, select the values from the memory that correspond to the current states of the signaling circuitry and the physical property of the wireless device, and apply the selected values to their associated tunable elements, wherein the current state of the signaling circuitry comprises a transmit return loss magnitude and phase.
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Abstract
The present disclosure relates generally to tunable impedance matching networks and methods for the use of such networks. In one example, a method includes identifying state information about a mobile device, accessing a memory to identify a configuration of an impedance matching network based on the state information, and applying the values from the configuration to the impedance matching network.
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Citations
26 Claims
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1. A system for impedance matching in a wireless device, comprising:
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signaling circuitry coupled to an antenna and configured to receive a signal at a first frequency and transmit a signal at a second frequency; impedance matching circuitry coupled to the signaling circuitry and having a plurality of tunable elements for matching an impedance of the first and second frequencies with an impedance of the antenna; a memory containing a plurality of values associated with the tunable elements, wherein each value corresponds to a state of the signaling circuitry and is defined to configure the associated tunable element for impedance matching at both the first and second frequencies when the signaling circuitry is in the corresponding state; and a controller configured to obtain a current state of the signaling circuitry and a current state of a physical property of the wireless device, select the values from the memory that correspond to the current states of the signaling circuitry and the physical property of the wireless device, and apply the selected values to their associated tunable elements, wherein the current state of the signaling circuitry comprises a transmit return loss magnitude and phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit for use in a tunable matching network in a wireless device, comprising:
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a first reactive series section coupled to an input line, the first reactive series section having a first variable capacitor and a first fixed inductor coupled in parallel to the first variable capacitor; a second reactive series section coupled to an antenna via an output line and coupled in series to the first reactive series section, the second reactive series section having a second variable capacitor and a second fixed inductor coupled in parallel to the second variable capacitor; a third variable capacitor coupled between ground and the input line and first reactive series section; and a fourth variable capacitor coupled between ground and the output line and second reactive series section, wherein the capacitance value of each of the variable capacitors is determined according to a transmit return loss magnitude and phase of a signaling circuitry and a current state of a physical property of the wireless device. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A mobile device for use in a wireless network, the mobile device comprising:
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signaling circuitry coupled to an antenna; an impedance matching network coupled to the signaling circuitry; a controller configured to obtain a current state of the signaling circuitry; and a memory containing a look-up table for use by the controller in setting the impedance matching network in the mobile device, the look-up table comprising; an index having values associated with a plurality of mobile device states and a plurality of states of a physical property of the mobile device; and a plurality of configurations, each configuration associated with a particular mobile device state and a particular state of the physical property of the mobile device, and containing predefined values for setting a plurality of tunable elements of the impedance matching network to simultaneously match a first frequency and a second frequency, wherein the plurality of mobile device states comprise a transmit return loss magnitude and phase. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A system for impedance matching in a wireless device, comprising:
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signaling circuitry coupled to an antenna and configured to receive a signal at a first frequency and transmit a signal at a second frequency; impedance matching circuitry coupled to the signaling circuitry and having a plurality of tunable elements for matching an impedance of the first and second frequencies with an impedance of the antenna; a memory containing a plurality of values associated with the tunable elements, wherein each value corresponds to a state of the signaling circuitry and is defined to configure the associated tunable element for impedance matching at both the first and second frequencies when the signaling circuitry is in the corresponding state; and a controller configured to obtain a current state of the signaling circuitry and determine whether the wireless device is open or closed, select the values from the memory that correspond to the current state of the signaling circuitry and the determination of whether the wireless device is open or closed, and apply the selected values to their associated tunable elements, wherein the current state of the signaling circuitry comprises a transmit return loss magnitude and phase. - View Dependent Claims (26)
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Specification