Tunable antenna with slot-based parasitic element
First Claim
1. An electronic device antenna, comprising:
- an antenna ground;
an inverted-F antenna resonating element that has a resonating element arm that is separated from the antenna ground by a gap, wherein the inverted-F antenna resonating element comprises a metal electronic device housing structure;
a slot-based parasitic antenna resonating element that is near-field coupled to the inverted-F antenna resonating element and that comprises a slot having a first edge defined by the metal device housing structure and an opposing second edge defined by the antenna ground; and
an antenna feed having a positive antenna feed terminal coupled to the inverted-F antenna resonating element and a ground antenna feed terminal coupled to the antenna ground, wherein the slot-based parasitic antenna resonating element is not directly fed by the antenna feed.
1 Assignment
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Accused Products
Abstract
Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may form a dual arm inverted-F antenna. The antenna may have a resonating element formed from portions of a peripheral conductive electronic device housing member and may have an antenna ground that is separated from the antenna resonating element by a gap. A short circuit path may bridge the gap. An antenna feed may be coupled across the gap in parallel with the short circuit path. Low band tuning may be provided using an adjustable inductor that bridges the gap. The antenna may have a slot-based parasitic antenna resonating element with a slot formed between portions of the peripheral conductive electronic device housing member and the antenna ground. An adjustable capacitor may bridge the slot to provide high band tuning.
78 Citations
25 Claims
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1. An electronic device antenna, comprising:
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an antenna ground; an inverted-F antenna resonating element that has a resonating element arm that is separated from the antenna ground by a gap, wherein the inverted-F antenna resonating element comprises a metal electronic device housing structure; a slot-based parasitic antenna resonating element that is near-field coupled to the inverted-F antenna resonating element and that comprises a slot having a first edge defined by the metal device housing structure and an opposing second edge defined by the antenna ground; and an antenna feed having a positive antenna feed terminal coupled to the inverted-F antenna resonating element and a ground antenna feed terminal coupled to the antenna ground, wherein the slot-based parasitic antenna resonating element is not directly fed by the antenna feed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 23, 24)
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14. An antenna, comprising:
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an antenna ground; an inverted-F antenna resonating element that is separated from the antenna ground by a gap; and a slot-based parasitic antenna resonating element having a slot with an open slot end that is formed between the antenna ground and the inverted-F antenna resonating element and a closed slot end that opposes the open slot end, wherein the closed slot end is surrounded on at least three sides by the antenna ground. - View Dependent Claims (15, 16, 17, 18, 22)
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19. An antenna, comprising:
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a dual arm inverted-F antenna resonating element formed from a metal electronic device housing structure; an antenna ground that is separated from the dual arm inverted-F antenna resonating element by a gap; a short circuit branch coupled between the dual arm inverted-F antenna resonating element and the antenna ground across the gap; an antenna feed coupled between the dual arm inverted-F antenna resonating element and the antenna ground across the gap, wherein the dual arm inverted-F antenna resonating element has a low band arm and a high band arm extending from opposing sides of the antenna feed; a slot-based parasitic antenna resonating element having a slot, wherein the low band arm resonates in a first frequency band, the high band arm resonates in a second frequency band that is greater than the first frequency band, and the slot-based parasitic antenna resonating element resonates in a third frequency band that is greater than the second frequency band; and an adjustable inductor coupled between the low band arm and the antenna ground that bridges the slot and that is configured to adjust the first frequency band in which the low band arm resonates. - View Dependent Claims (20, 21, 25)
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Specification