Hand grip sensor for external chassis antenna
First Claim
1. An antenna system comprising:
- a first antenna;
a first metal section spaced by a first gap from a first end of the first antenna;
a first ground section spaced by a third gap from the first metal section, the first ground section connected to ground;
a capacitance sensor configured to measure a first differential capacitance between the first antenna and the first metal section, when the first differential capacitance exceeds a first differential threshold the capacitance sensor provides a capacitance sense signal indicating that the first gap is being bridged by a user'"'"'s touch; and
a matching circuit controller responsive to the capacitance sense signal and configured to provide an impedance control signal to a tunable antenna matching circuit to adjust an impedance between the first antenna and a transceiver based on the first gap being bridged, wherein the tunable antenna matching circuit is connected between the first antenna and the transceiver and wherein the antenna system further comprises a direct current (DC) blocking capacitor between the tunable antenna matching circuit and the first antenna, and wherein the matching circuit controller outputs a tuning signal to a second antenna matching circuit to reconfigure the second antenna matching circuit to impedance match a second antenna.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and system for detecting whether the position of a user'"'"'s hand gripping a mobile communication device chassis affects an external antenna is provided. A sectioned metal band about a periphery of a mobile communication device has a radiating antenna in at least one metal section. The radiating antenna section is bounded on both sides by electrically floating metal sections. Each of the electrically floating metal sections is bounded on the side distal from the antenna section by a ground metal section. Each metal section separated from an adjacent metal section by an insulating gap. Embodiments measure a differential capacitance between the antenna section and the floating metal section and measure a single and capacitance between the floating metal section and the grounded section to determine whether a user'"'"'s hand is bridging one or more of the insulating gaps.
24 Citations
16 Claims
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1. An antenna system comprising:
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a first antenna; a first metal section spaced by a first gap from a first end of the first antenna; a first ground section spaced by a third gap from the first metal section, the first ground section connected to ground; a capacitance sensor configured to measure a first differential capacitance between the first antenna and the first metal section, when the first differential capacitance exceeds a first differential threshold the capacitance sensor provides a capacitance sense signal indicating that the first gap is being bridged by a user'"'"'s touch; and a matching circuit controller responsive to the capacitance sense signal and configured to provide an impedance control signal to a tunable antenna matching circuit to adjust an impedance between the first antenna and a transceiver based on the first gap being bridged, wherein the tunable antenna matching circuit is connected between the first antenna and the transceiver and wherein the antenna system further comprises a direct current (DC) blocking capacitor between the tunable antenna matching circuit and the first antenna, and wherein the matching circuit controller outputs a tuning signal to a second antenna matching circuit to reconfigure the second antenna matching circuit to impedance match a second antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A mobile communication device that is user equipment (UE) comprising:
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a first antenna section on an exterior of the UE; a first metal section spaced from and adjacent to a first end of the first antenna section; a first ground section spaced from and adjacent to the first metal section such that the first metal section is between the first antenna section and the first ground section, the first ground section being connected to ground; a capacitance module comprising; a differential capacitance sensor configured to measure a first differential capacitance between the first antenna section and the first metal section; and a capacitance sensor configured to measure a first capacitance between the first metal section and ground; wherein the capacitance module outputs the first differential capacitance and the first capacitance as a capacitance sense signal; a matching circuit controller configured to use the capacitance sense signal to reconfigure a tunable antenna matching circuit, wherein the antenna matching circuit is connected between a transceiver and the first antenna section, wherein the matching circuit controller outputs a tuning signal to a second antenna matching circuit to reconfigure the second antenna matching circuit to impedance match a second antenna section; and a direct current (DC) blocking capacitor connected between the tunable antenna matching circuit and the first antenna section. - View Dependent Claims (9, 10, 11, 12)
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13. For a mobile communication device that is user equipment (UE) having an external antenna incorporated about a peripheral surface of the UE, a method of impedance matching at least a first antenna with a transceiver comprising:
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measuring, by a differential capacitance sensor, a first differential capacitance between the first antenna and a first metal section, the first metal section being adjacent to a first end of the first antenna, the first metal section and the first antenna having a first gap there between; measuring, by a capacitance sensor, a first capacitance between the first metal section and a first ground section, the first metal section being adjacent to the first ground section, and first metal section and the first ground section having a third gap there between, the first ground section being connected to ground; and reconfiguring an antenna impedance matching circuit which is connected between the first antenna and the transceiver and where a direct current (DC) blocking capacitor is disposed between the antenna impedance matching circuit and the first antenna so as to impedance match the first antenna with the transceiver based on the combination of the first differential capacitance and the first capacitance, and reconfiguring the antenna impedance matching circuit to output a tuning signal to a second antenna matching circuit to reconfigure the second antenna matching circuit to impedance match a second antenna. - View Dependent Claims (14, 15, 16)
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Specification