Patent ID: 6476769
Filing Date: 2002-11-05
Classification: H01Q

Abstract:
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.