Head-hand capacitance compensation with digital variable capacitor
First Claim
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1. A device, comprising:
- a first antenna;
an RF source coupled to the first antenna;
a capacitive sensor capable of detecting the capacitance of the antenna;
a feedback controller coupled to the capacitive sensor; and
a first capacitor coupled to the antenna and to the feedback controller, wherein the antenna, the first capacitor, the feedback controller, and the capacitive sensor are connected in order in direct series connection.
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Abstract
The present disclosure generally relates to a device having a capacitance sensor that detects a change in capacitance that occurs in the antenna whenever the antenna is in close proximity to a user'"'"'s hand and/or head. Following detection of the capacitance change, the capacitance of the antenna may be changed by using a variable capacitor that is coupled to the sensor through a controller.
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Citations
18 Claims
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1. A device, comprising:
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a first antenna; an RF source coupled to the first antenna; a capacitive sensor capable of detecting the capacitance of the antenna; a feedback controller coupled to the capacitive sensor; and a first capacitor coupled to the antenna and to the feedback controller, wherein the antenna, the first capacitor, the feedback controller, and the capacitive sensor are connected in order in direct series connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device, comprising:
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a first antenna; an RF source coupled to the first antenna; a capacitive sensor capable of detecting capacitance of the antenna, the capacitive sensor configured to detect a change of the capacitance of the antenna from a first capacitance; a feedback controller coupled to the capacitive sensor; and a first variable capacitor coupled to the antenna and to the feedback controller, wherein the first variable capacitor, the feedback controller and the capacitive sensor are connected in series with the antenna and in that order from the antenna, and wherein the feedback controller is configured to continuously change the capacitance of the first variable capacitor in response to the change of the capacitance of the antenna so that the adjusted capacitance of the antenna returns to the first capacitance, wherein the antenna, the first variable capacitor, the feedback controller, and the capacitive sensor are connected in order in direct series connection. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification