Electronic devices with capacitive proximity sensors for proximity-based radio-frequency power control
First Claim
1. An electronic device comprising:
- a housing;
an antenna window in the housing;
metal structures that serve as an antenna resonating element and a capacitive proximity sensor electrode, wherein the metal structures are configured to transmit radio-frequency signals through the antenna window;
a capacitance-to-digital converter coupled to the metal structures; and
a plurality of radio-frequency choke inductors coupled between the metal structures and the capacitance-to-digital converter, wherein the capacitance-to-digital converter has first and second inputs, a first radio-frequency choke inductor of the plurality of radio-frequency choke inductors is coupled between the metal structures and the first input, and a second radio-frequency choke inductor of the plurality of radio-frequency choke inductors is coupled between the metal structures and the second input.
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Abstract
An electronic device may have a housing in which an antenna is mounted. An antenna window may be mounted in the housing to allow radio-frequency signals to be transmitted from the antenna and to allow the antenna to receive radio-frequency signals. Near-field radiation limits may be satisfied by reducing transmit power when an external object is detected in the vicinity of the dielectric antenna window and the antenna. A capacitive proximity sensor may be used in detecting external objects in the vicinity of the antenna. The proximity sensor may have conductive layers separated by a dielectric. A capacitance-to-digital converter may be coupled to the proximity sensor by inductors. The capacitive proximity sensor may be interposed between an antenna resonating element and the antenna window. The capacitive proximity sensor may serve as a parasitic antenna resonating element and may be coupled to the housing by a capacitor.
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Citations
14 Claims
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1. An electronic device comprising:
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a housing; an antenna window in the housing; metal structures that serve as an antenna resonating element and a capacitive proximity sensor electrode, wherein the metal structures are configured to transmit radio-frequency signals through the antenna window; a capacitance-to-digital converter coupled to the metal structures; and a plurality of radio-frequency choke inductors coupled between the metal structures and the capacitance-to-digital converter, wherein the capacitance-to-digital converter has first and second inputs, a first radio-frequency choke inductor of the plurality of radio-frequency choke inductors is coupled between the metal structures and the first input, and a second radio-frequency choke inductor of the plurality of radio-frequency choke inductors is coupled between the metal structures and the second input. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless electronic device comprising:
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a housing; an antenna window in the housing; and capacitive proximity sensor electrode structures mounted in the housing; antenna resonating element structures mounted in the housing and configured to transmit radio-frequency signals through the antenna window; a capacitance-to-digital converter coupled to the capacitive proximity sensor electrode structures, wherein the capacitance-to-digital converter is configured to generate a digital capacitance value; and proximity detection circuitry that is configured to compute a value corresponding to a distance between the capacitive proximity sensor electrode structures and an external object based on the generated digital capacitance value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification