Adaptive antenna optimization network
First Claim
1. A wireless communications device for transmitting signals in a first plurality of transmit frequency bands and for receiving signals in a second plurality of receive frequency bands, the wireless communications device comprising:
- an antenna for transmitting signals to and receiving signals from a wireless communications network; and
an adjustable matching network selectively connecting the antenna to a select one of a third plurality of transmit power amplifiers corresponding to the first plurality of transmit frequency bands for signal transmission, the adjustable matching network matching an impedance of the antenna to the select one transmit power amplifier.
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Accused Products
Abstract
An adjustable matching network is provided for a wireless communications device transmitting and receiving signals in multiple frequency bands via an antenna. The adjustable matching network selectively connecting the antenna to a select power amplifier corresponding to a selected transmit frequency band and automatically matching the impedance of the antenna to the select power amplifier. The adjustable matching network also selectively connecting the antenna to a select bandpass filter corresponding to a selected receive frequency band and automatically matching the impedance of the antenna to the select bandpass filter.
249 Citations
58 Claims
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1. A wireless communications device for transmitting signals in a first plurality of transmit frequency bands and for receiving signals in a second plurality of receive frequency bands, the wireless communications device comprising:
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an antenna for transmitting signals to and receiving signals from a wireless communications network; and an adjustable matching network selectively connecting the antenna to a select one of a third plurality of transmit power amplifiers corresponding to the first plurality of transmit frequency bands for signal transmission, the adjustable matching network matching an impedance of the antenna to the select one transmit power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A wireless communication device for transmitting and receiving signals in multiple transmit and receive frequency bands using Time Division Multiple Access (TDMA) signal formats, the wireless communications device comprising:
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an antenna for transmitting signals to and receiving signals from a wireless communications network; a transmit/receive switch selectively coupling the antenna to a transmit signal path during a transmit time slot of a frame period of the TDMA signal format, and selectively coupling the antenna to a receive signal path during a receive time slot of the TDMA frame period; a variable matching network connected in the transmit signal path between the antenna and a selected transmit power amplifier corresponding to a selected transmit frequency band; an impedance mismatch measuring and quantizing unit connected in the transmit signal path between the selected transmit power amplifier and the variable matching network, the impedance mismatch measuring and quantizing unit measuring forward and reflected power of a signal transmitted on the selected transmit frequency band to determine a reflection coefficient, and generating quantized impedance mismatch indication signals indicative of the phase of the reflection coefficient, the impedance mismatch measuring and quantizing unit generating the mismatch indication signals during the transmit time slot of the TDMA frame period, the impedance mismatch indication signals including a first bit indicative of whether a reflection coefficient magnitude developed from the measured forward and reflected power is less than or greater than a predetermined value; and a control processing unit receiving and processing the mismatch indication signals and providing adjustment control signals to the variable matching network during a portion of the TDMA frame period not utilized by the wireless communications device for transmission. - View Dependent Claims (35, 36, 37)
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38. The wireless communication device 37, wherein the 2-bit quadrant indication portion by the control processing unit to output the adjustment control signals from a precomputed look-up table.
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39. A method of optimizing impedance between a transceiver and an antenna in a wireless communications device comprising:
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measuring a signal to determine a complex reflection coefficient indicative of a quality of an impedance match between a transceiver and an antenna at a selected frequency band; detecting an impedance mismatch between the transceiver and the antenna at the selected frequency band based on said complex reflection coefficient; determining the phase of the complex reflection coefficient; generating mismatch indication signals during a transmit time slot of a TDMA frame period based on the phase of the complex reflection coefficient, the mismatch indication signals including a first bit indicative of whether a reflection coefficient magnitude is less than or greater than a predetermined value; and automatically adjusting a variable impedance matching network in the wireless communications device, during an idle period of communications, based on the mismatch indication signals to minimize the impedance mismatch at the selected frequency band. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A method of optimizing impedance between a transceiver and an antenna in a wireless communications device comprising:
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measuring a forward power and a reflected power of a transmitted signal transmitted on a selected transmit frequency band to determine a reflection coefficient; quantizing the forward power and the reflected power of the transmitted signal to determine a complex reflection coefficient; generating a quantized impedance mismatch signal indicative of the phase of the complex reflection coefficient during the transmit time slot of the TDMA frame, the quantized impedance mismatch signal including a first bit indicative of whether a magnitude of the reflection coefficient is less than or greater than a predetermined value; and adjusting a variable impedance matching network responsive to the quantized impedance mismatch signal, during an idle period of communications in the TDMA frame, to minimize an impedance mismatch between the antenna and a transceiver at the selected frequency. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57)
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58. An impedance optimization circuit for a wireless communications device comprising:
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a controller programmed to; measure a forward power and a reverse power of a transmitted signal on a selected frequency band to determine a reflection coefficient indicative of an impedance match between a transceiver and an antenna at the selected frequency band; detect an impedance mismatch between the transceiver and the antenna at the selected frequency band based on said reflection coefficient; generate a quantized impedance mismatch signal indicative of the phase of the reflection coefficient, the quantized impedance mismatch signal including a bit indicative of whether a magnitude of the reflection coefficient is less than or greater than a predetermined value; and adjust an variable impedance matching network, during an idle period of communications, responsive to said quantized impedance mismatch signal to minimize the impedance mismatch between the transceiver and the antenna at the selected frequency band.
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Specification