Apparatus and methods for tuning antenna impedance using transmitter and receiver parameters
First Claim
1. An impedance transformation circuit for use with a transmitter, a receiver, and an antenna, the transmitter providing a transmission signal for transmission by the antenna, the antenna providing a received signal having an associated signal parameter to the receiver, the impedance transformation circuit comprising:
- an impedance adjusting circuit between the antenna and receiver and transmitter, the impedance adjusting circuit being configured to selectively reduce the presented impedance difference between the transmitter and the antenna in response to a control signal and while the receiver is connected to the antenna, and to selectively reduce the presented impedance difference between the receiver and the antenna in response to the control signal and while the transmitter is connected to the antenna;
anda controller that generates the control signal to change the presented impedance difference in response to the signal parameter, wherein the signal parameter is indicative of when the receiver is actively receiving signals and when the transmitter is actively transmitting signals, and the controller is configured to modify the control signal to reduce the presented impedance difference between the transmitter and the antenna when the transmitter is actively transmitting signals and the receiver is not actively receiving signals, and to modify the control signal to reduce the presented impedance difference between the antenna and the receiver when the transmitter is not actively transmitting signals and the receiver is actively receiving signals.
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Accused Products
Abstract
According to some embodiments of the present invention, an impedance transformation circuit is provided for use with a transmitter, a receiver, and an antenna. The transmitter may provide transmission signals for transmission by the antenna. The antenna may provide received signals having an associated signal parameter to the receiver. The impedance transformation circuit includes an impedance adjusting circuit and a controller. The impedance adjusting circuit is connected between the antenna, the receiver, and the transmitter. The impedance adjusting circuit is configured to change an impedance difference presented between at least one of: 1) the transmitter and the antenna, and 2) the antenna and the receiver, in response to a control signal. The controller generates the control signal to change the presented impedance difference in response to a signal parameter.
186 Citations
23 Claims
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1. An impedance transformation circuit for use with a transmitter, a receiver, and an antenna, the transmitter providing a transmission signal for transmission by the antenna, the antenna providing a received signal having an associated signal parameter to the receiver, the impedance transformation circuit comprising:
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an impedance adjusting circuit between the antenna and receiver and transmitter, the impedance adjusting circuit being configured to selectively reduce the presented impedance difference between the transmitter and the antenna in response to a control signal and while the receiver is connected to the antenna, and to selectively reduce the presented impedance difference between the receiver and the antenna in response to the control signal and while the transmitter is connected to the antenna;
anda controller that generates the control signal to change the presented impedance difference in response to the signal parameter, wherein the signal parameter is indicative of when the receiver is actively receiving signals and when the transmitter is actively transmitting signals, and the controller is configured to modify the control signal to reduce the presented impedance difference between the transmitter and the antenna when the transmitter is actively transmitting signals and the receiver is not actively receiving signals, and to modify the control signal to reduce the presented impedance difference between the antenna and the receiver when the transmitter is not actively transmitting signals and the receiver is actively receiving signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An impedance transformation circuit for use with a transmitter, a receiver, and an antenna, the transmitter providing a transmission signal for transmission by the antenna, the antenna providing a received signal having an associated signal parameter to the receiver, the impedance transformation circuit comprising:
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an impedance adjusting circuit between the antenna and receiver and transmitter, the impedance adjusting circuit being configured to change an impedance difference presented between at least one of;
1) the transmitter and the antenna, and
2) the antenna and the receiver, in response to a control signal; anda controller that generates the control signal to change the presented impedance difference in response to the signal parameter, wherein the signal parameter is indicative of a received signal strength of the received signal and the controller modifies the control signal to reduce the presented impedance difference between the transmitter and the antenna if the received signal strength satisfies a threshold value. - View Dependent Claims (9)
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10. An impedance transformation circuit for use with a transmitter, a receiver, and an antenna, the transmitter providing a transmission signal for transmission by the antenna, the antenna providing a received signal having an associated signal parameter to the receiver, the impedance transformation circuit comprising:
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an impedance adjusting circuit between the antenna and receiver and transmitter, the impedance adjusting circuit being configured to change an impedance difference presented between at least one of;
1) the transmitter and the antenna, and
2) the antenna and the receiver, in response to a control signal; anda controller that generates the control signal to change the presented impedance difference in response to the signal parameter, wherein the signal parameter is indicative of a bit error rate of the received signal and the controller modifies the control signal to reduce the presented impedance difference between the transmitter and the antenna if the bit error rate satisfies a threshold value. - View Dependent Claims (11)
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12. A method of operating an antenna tuner used with a transmitter, a receiver, and an antenna, the method comprising:
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sensing when the transmitter is actively providing signals to the antenna for transmission and when the receiver is actively receiving signals; and adjusting an impedance presented between at least one of;
1) the transmitter and the antenna, and
2) the antenna and the receiver, in response to the sensed parameter by reducing the presented impedance between the transmitter and the antenna when the transmitter is active and the receiver is not active and while the receiver is connected to the antenna, and reducing the presented impedance between the receiver and the antenna when the receiver is active and the transmitter is not active and while the transmitter is connected to the antenna. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method of operating an antenna tuner used with a transmitter, a receiver, and an antenna, the method comprising:
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sensing a signal parameter associated with a received signal provided by the antenna to the receiver and that is indicative of a received signal strength of the received signal; and adjusting an impedance presented between at least one of;
1) the transmitter and the antenna, and
2) the antenna and the receiver, in response to the sensed parameter and comprising reducing the presented impedance difference between the transmitter and the antenna when the sensed parameter indicates that the received signal strength satisfies a threshold value. - View Dependent Claims (21)
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22. A method of operating an antenna tuner used with a transmitter, a receiver, and an antenna, the method comprising:
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sensing a signal parameter associated with a received signal provided by the antenna to the receiver and that is indicative of a bit error rate of the received signal and adjusting an impedance presented between at least one of;
1) the transmitter and the antenna, and
2) the antenna and the receiver, in response to the sensed parameter and comprising reducing the presented impedance difference between the transmitter and the antenna when the sensed parameter indicates that the bit error rate satisfies a threshold value. - View Dependent Claims (23)
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Specification