Adaptively tunable antennas incorporating an external probe to monitor radiated power
First Claim
Patent Images
1. An apparatus, comprising:
- an adaptively-tuned antenna including a variable reactance network, connected to said antenna;
an RF field probe located near the antenna;
an RF detector to sense voltage from said field probe;
a controller that monitors said RF voltage and supplies control signals to a driver circuit; and
wherein said driver circuit converts said control signals to bias signals for said variable reactance network.
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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.
250 Citations
20 Claims
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1. An apparatus, comprising:
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an adaptively-tuned antenna including a variable reactance network, connected to said antenna;
an RF field probe located near the antenna;
an RF detector to sense voltage from said field probe;
a controller that monitors said RF voltage and supplies control signals to a driver circuit; and
wherein said driver circuit converts said control signals to bias signals for said variable reactance network. - View Dependent Claims (2, 3, 4)
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5. A method, comprising:
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improving the efficiency of a transmitting antenna system by using a variable reactance network;
sensing the RF voltage present on a near field probe; and
controlling the bias signal presented to said variable reactance network to maximize the RF voltage present on said near field probe. - View Dependent Claims (6, 7, 8)
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9. An apparatus adapted to make an antenna tunable, comprising:
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a variable reactance network connected to said antenna; and
a closed loop control system that senses the RF voltage at a near field probe and adjusts the reactance of said network to maximize the RF voltage.
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10. An apparatus, comprising:
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an adaptively-tuned receive antenna including a variable reactance network connected to said antenna;
an RF test probe located near said antenna from which is radiated a test signal;
an RF detector to sense voltage from a point on the antenna; and
a controller that monitors said RF voltage and supplies control signals to a driver circuit, wherein said driver circuit converts control signals to bias signals for said variable reactance network. - View Dependent Claims (11, 12, 13)
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14. A method to improve the efficiency of a receiving antenna system, comprising
transmitting a narrowband RF signal at a desired test frequency; -
using a variable reactance network connect to said antenna;
sensing the RF voltage present on the antenna;
controlling the bias signal presented to the variable reactance network; and
maximizing the RF voltage present on said antenna. - View Dependent Claims (15, 16, 17, 19, 20)
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18. A machine-accessible medium that provides instructions, which when accessed, cause a machine to perform operations comprising:
improving the efficiency of a receiving antenna system by controlling the transmission of a narrowband RF signal at a desired test frequency, using a variable reactance network connected to said antenna, sensing the RF voltage present on the antenna, controlling the bias signal presented to said variable reactance network and maximizing the RF voltage present on said antenna.
Specification