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The present invention relates to a multiband folded loop antenna comprising a dielectric substrate, a ground plane, a radiating portion and a matching circuit. The ground plane is located on the dielectric substrate and has a grounding point. The radiating portion comprises a supporter, a loop strip

The present invention relates to a multiband folded loop antenna comprising a dielectric substrate, a ground plane, a radiating portion and a matching circuit. The ground plane is located on the dielectric substrate and has a grounding point. The radiating portion comprises a supporter, a loop strip, and a tuning patch. The loop strip has a length about a half-wavelength of the central frequency of the antenna's first resonant mode. The loop strip has a feeding end and a grounding end, with the grounding end electrically connected to the grounding point on the ground plane. The loop strip is folded into a three-dimensional structure and is supported by the supporter. The tuning patch is electrically connected to the loop strip. The matching circuit is located on the dielectric substrate with one terminal electrically connected to the feeding end of the loop strip and another terminal to a signal source.

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What is claimed is: 1. A multiband folded loop antenna, comprising: a dielectric substrate; a ground plane located on the dielectric substrate and having a grounding point; a radiating portion comprising: a supporter; a loop strip having a length about a half-wavelength of the central frequency of

What is claimed is: 1. A multiband folded loop antenna, comprising: a dielectric substrate; a ground plane located on the dielectric substrate and having a grounding point; a radiating portion comprising: a supporter; a loop strip having a length about a half-wavelength of the central frequency of the first resonant mode of the antenna, and having a feeding end and a grounding end, wherein the ground end is electrically connected to the grounding point of the ground plane, and the loop strip is folded into a three-dimensional structure and supported by the supporter; and at least one tuning patch electrically connected to the loop strip; and a matching circuit located on the dielectric substrate, and electrically connected at one terminal to the feeding end of the loop strip of the radiating portion and at another terminal to a signal source. 2. The multiband folded loop antenna of claim 1, wherein the dielectric substrate is a system circuit board of a mobile communication apparatus. 3. The multiband folded loop antenna of claim 1, wherein the ground plane is a system ground plane of a mobile communication apparatus. 4. The multiband folded loop antenna of claim 1, wherein the ground plane is formed on the dielectric substrate by printing or etching. 5. The multiband folded loop antenna of claim 1, wherein the material of the supporter is selected from the group consisting of air, a dielectric substrate, a plastic material, and a ceramic material. 6. The multiband folded loop antenna of claim 1, wherein the matching circuit comprises at least one capacitive element and at least one inductive element, and the capacitive element and the inductive element are connected in parallel. 7. A multiband folded loop antenna, comprising: a dielectric substrate; a ground plane located on the dielectric substrate and having a grounding point; and a radiating portion comprising: a supporter; a loop strip having a length about a half-wavelength of the central frequency of the first resonant mode of the antenna, and having a feeding end and a grounding end, wherein the feeding end is connected to a signal source, and the grounding end is electrically connected to the grounding point of the ground plane, and the loop strip is folded into a three-dimensional structure and supported by the supporter; and at least one tuning patch electrically connected to the loop strip. 8. The multiband folded loop antenna of claim 7, wherein the dielectric substrate is a system circuit board of a mobile communication apparatus. 9. The multiband folded loop antenna of claim 7, wherein the ground plane is a system ground plane of a mobile communication apparatus. 10. The multiband folded loop antenna of claim 7, wherein the ground plane is formed on the dielectric substrate by printing or etching. 11. The multiband folded loop antenna of claim 7, wherein the material of the supporter is selected from the group consisting of air, a dielectric substrate, a plastic material, and a ceramic material. 12. A multiband folded loop antenna, comprising: a dielectric substrate; a ground plane, located on the dielectric substrate and having a grounding point; a radiating portion, comprising: a loop strip, having a length about a half-wavelength of the central frequency of the first resonant mode of the antenna, and having a first U-shaped portion, a second U-shaped portion, a first connection portion, a second connection portion, a third connected portion, a feeding end and a grounding end, wherein the ground end is electrically connected to the grounding point of the ground plane, the first connection portion connects the first U-shaped portion to the feeding end, the second connection portion connects the first U-shaped portion to the second U-shaped portion, the third connected portion connects the second U-shaped portion to the grounding end, and the loop strip is folded into a three-dimensional structure. 13. The multiband folded loop antenna of claim 12, wherein the first U-shaped portion and the second U-shaped portion are on the same plane. 14. The multiband folded loop antenna of claim 13, wherein the first U-shaped portion has a first opening, the second U-shaped portion has a second opening, and the first opening and the second opening are toward opposite directions. 15. The multiband folded loop antenna of claim 12, wherein the radiating portion further comprises at least one tuning patch connected to the second connection portion.