Adaptively tunable antennas incorporating an external probe to monitor radiated power
First Claim
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1. An apparatus, comprising:
- an RF field probe located near an antenna, wherein to a variable reactance network is connected on the antenna, and wherein the variable reactance network comprises at least one electrically tunable variable capacitor;
an RF detector to sense RF voltage from said RF field probe, the RF voltage being generated based on radiated power of the antenna;
wherein a controller monitors said RF voltage, generates control signals based on the monitored RF voltage and supplies the control signals to a driver circuit, andwherein said driver circuit converts said control signals to bias voltages that are used by said variable reactance network for tuning the antenna via applying the bias voltages to the at least one electrically tunable variable capacitor to adjust a capacitance of the at least one electrically tunable variable capacitor.
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Abstract
An embodiment of the present invention an apparatus, comprising an apparatus, comprising an adaptively-tuned antenna including a variable reactance network connected to the antenna, an RF field probe located near the antenna, an RF detector to sense voltage from the field probe, a controller that monitors the RF voltage and supplies control signals to a driver circuit and wherein the driver circuit converts the control signals to bias signals for the variable reactance network.
332 Citations
20 Claims
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1. An apparatus, comprising:
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an RF field probe located near an antenna, wherein to a variable reactance network is connected on the antenna, and wherein the variable reactance network comprises at least one electrically tunable variable capacitor; an RF detector to sense RF voltage from said RF field probe, the RF voltage being generated based on radiated power of the antenna; wherein a controller monitors said RF voltage, generates control signals based on the monitored RF voltage and supplies the control signals to a driver circuit, and wherein said driver circuit converts said control signals to bias voltages that are used by said variable reactance network for tuning the antenna via applying the bias voltages to the at least one electrically tunable variable capacitor to adjust a capacitance of the at least one electrically tunable variable capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for tuning an antenna, the apparatus comprising:
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a variable reactance network coupled to said antenna, the variable reactance network comprising at least one electrically tunable variable capacitor, wherein a control system senses an RF voltage at a field probe and adjusts a capacitance of the at least one electrically tunable variable capacitor of said variable reactance network based on the sensed RF voltage to increase the RF voltage, wherein the capacitance of the at least one electrically tunable variable capacitor is adjusted by applying a bias voltage to the at least one electrically tunable variable capacitor. - View Dependent Claims (11, 12, 13)
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14. An apparatus, comprising:
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an RF probe positioned in proximity to an antenna from which is radiated a signal; and an RF detector to sense an RF voltage from the antenna by way of the RF probe, the RF voltage being generated based on the radiated signal of the antenna, wherein a controller monitors said RF voltage, generates control signals based on the monitored RF voltage and supplies the control signals to a driver circuit, wherein said driver circuit converts control signals to one of bias voltage or bias current for a variable reactance network coupled to said antenna for tuning the antenna via applying the one of the bias voltage or bias current to a variable reactance component of the variable reactance network to adjust the variable reactance component over a range of reactance values. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification