Internal multi-band antenna
First Claim
1. A multi-band radio antenna structure for use in a hand-held telecommunication device comprising:
- a ground plane;
a sub-antenna structure comprising;
a first radiating element formed of a first electrically conducting area having a first resonance frequency, wherein the first electrically conducting area has a first end connected to the ground plane for grounding the first radiating element, and wherein the first radiating element has a first feed-point for feeding located adjacent to the first end; and
a second radiating element formed of a second electrically conducting area disposed adjacent to the first electrically conducting area, wherein the second electrically conducting area has a second end electrically connected to the first end of the first electrically conducting area for grounding the second radiating element and for sharing the first feed-point for feeding;
a third radiating element formed of a third electrically conducting area adjacent to the sub-antenna structure, wherein the third electrically conducting area has a third end connected to the ground plane for grounding the third radiating element, and wherein the third radiating element has a second feed-point for feeding located adjacent to the third end;
a first switching device, operable between an open position and a closed position, connecting between the first feed-point and the ground plane; and
a second switching device, operable between an open position and a closed position, connecting between the second feed-point and the ground plane, wherein when the second switching device is operated in the closed position, thereby grounding the second feed-point and the first switching device is operated in the open position for enabling the first feed-point feeding, the second radiating element has a second resonance frequency substantially lower than the first resonance frequency and the third radiating element has a third resonance frequency generally higher than the first resonance frequency, and when the first switching device is operated in the closed position, thereby grounding the first feed-point, and the second switching device is operated in the open position for enabling the second feed-point feeding, the third radiating element has a fourth resonance frequency generally higher than the third resonance frequency.
2 Assignments
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Accused Products
Abstract
A radio antenna including a first shorted patch having a first resonance frequency (GSM1800), a second shorted patch connected to the first shorted patch for sharing a first feed point, and a third shorted patch separately having a second feed point. A first switch and a second switch connect between the ground and, respectively, the first and the second feed points. To cause the second and third shorted patches to produce, respectively, a second (E-GSM900) and a third resonance frequency (PCS1900), the first switch is operated in the open position while the second switch is operated in the closed position. To cause the first and third shorted patches to produce, respectively, a third frequency and a fourth resonance frequency (UMTS), the first switch is operated in the closed position while the second switch is operated in the open position.
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Citations
23 Claims
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1. A multi-band radio antenna structure for use in a hand-held telecommunication device comprising:
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a ground plane;
a sub-antenna structure comprising;
a first radiating element formed of a first electrically conducting area having a first resonance frequency, wherein the first electrically conducting area has a first end connected to the ground plane for grounding the first radiating element, and wherein the first radiating element has a first feed-point for feeding located adjacent to the first end; and
a second radiating element formed of a second electrically conducting area disposed adjacent to the first electrically conducting area, wherein the second electrically conducting area has a second end electrically connected to the first end of the first electrically conducting area for grounding the second radiating element and for sharing the first feed-point for feeding;
a third radiating element formed of a third electrically conducting area adjacent to the sub-antenna structure, wherein the third electrically conducting area has a third end connected to the ground plane for grounding the third radiating element, and wherein the third radiating element has a second feed-point for feeding located adjacent to the third end;
a first switching device, operable between an open position and a closed position, connecting between the first feed-point and the ground plane; and
a second switching device, operable between an open position and a closed position, connecting between the second feed-point and the ground plane, wherein when the second switching device is operated in the closed position, thereby grounding the second feed-point and the first switching device is operated in the open position for enabling the first feed-point feeding, the second radiating element has a second resonance frequency substantially lower than the first resonance frequency and the third radiating element has a third resonance frequency generally higher than the first resonance frequency, and when the first switching device is operated in the closed position, thereby grounding the first feed-point, and the second switching device is operated in the open position for enabling the second feed-point feeding, the third radiating element has a fourth resonance frequency generally higher than the third resonance frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of achieving at least four resonance frequencies in a multi-band antenna structure including:
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a ground plane;
a sub-antenna structure comprising;
a first radiating element formed of a first electrically conducting area having a first resonance frequency, wherein the first electrically conducting area has a first end connected to the ground plane for grounding the first radiating element, and wherein the first radiating element has a first feed-point for feeding located adjacent to the first end; and
a second radiating element formed of a second electrically conducting area disposed adjacent to the first electrically conducting area, wherein the second electrically conducting area has a second end electrically connected to the first end of the first electrically conducting area for grounding the second radiating element and for sharing the first feed-point for feeding; and
a third radiating element formed of a third electrically conducting area adjacent to the sub-antenna structure, wherein the third electrically conducting area has a third end connected to the ground plane for grounding the third radiating element, and wherein the third radiating element has a second feed-point for feeding located adjacent to the third end, said method comprising the steps of;
providing a first switching device, operable between an open position and a closed position, connecting between the first feed-point and the ground plane;
providing a second switching device, operable between an open position and a closed position, connecting between the second feed-point and the ground plane; and
setting the second switching device in the closed position, thereby grounding the second feed-point, and the first switching device is in the open position for enabling the first feed-point feeding so as to cause the second radiating element to produce a second resonance frequency substantially lower than the first resonance frequency and the third radiating element to produce a third resonance frequency generally higher than the first resonance frequency, or setting the first switching device in the closed position, thereby grounding the first feed-point, and the second switching device is in the open position for enabling the second feed-point feeding, so as to cause the third radiating element to produce a fourth resonance frequency generally higher than the third resonance frequency. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification