ELECTRONIC DEVICES WITH PARASITIC ANTENNA RESONATING ELEMENTS THAT REDUCE NEAR FIELD RADIATION
First Claim
1. An electronic device having front and rear surfaces, comprising:
- a conductive housing;
a dielectric antenna window in the conductive housing;
an antenna resonating element mounted in the conductive housing so that radio-frequency signals are transmitted through the dielectric antenna window; and
a parasitic antenna resonating element located between the antenna resonating element and the dielectric window.
1 Assignment
0 Petitions
Accused Products
Abstract
Antennas are provided for electronic devices such as portable computers. An electronic device may have a housing in which an antenna is mounted. The housing may be formed of conductive materials. A dielectric 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 proximity sensor may be used in detecting external objects. A parasitic antenna resonating element may be interposed between the antenna resonating element and the dielectric antenna window to minimize near-field radiation hotspots. The parasitic antenna resonating element may be formed using a capacitor electrode for the proximity sensor. A ferrite layer may be interposed between the parasitic element and the antenna window.
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Citations
21 Claims
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1. An electronic device having front and rear surfaces, comprising:
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a conductive housing; a dielectric antenna window in the conductive housing; an antenna resonating element mounted in the conductive housing so that radio-frequency signals are transmitted through the dielectric antenna window; and a parasitic antenna resonating element located between the antenna resonating element and the dielectric window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A tablet computer comprising:
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a conductive housing; a dielectric antenna window in the conductive housing; radio-frequency transceiver circuitry; an antenna with which the radio-frequency transceiver circuitry transmits radio-frequency signals in at least one cellular telephone band, wherein the antenna comprises; an antenna ground formed from at least a portion of the conductive housing; an antenna resonating element mounted adjacent to the dielectric antenna window; and a parasitic antenna resonating element formed from a planar metal member that is interposed between the antenna resonating element and the dielectric antenna window. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A portable electronic device comprising:
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at least one conductive housing structure to which a ground antenna feed terminal is connected; an antenna window in the conductive housing structure; an antenna resonating element formed from conductive traces on a flex circuit to which a positive antenna feed terminal is connected; radio-frequency transceiver circuitry that is coupled to the positive antenna feed terminal and the ground antenna feed terminal and that transmits radio-frequency signals through the antenna window using the antenna resonating element; and a parasitic antenna resonating element interposed between the antenna resonating element and the antenna window. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification