Patent ID: 7978141

Claim:
A coupled-fed multi-band loop antenna, comprising: a dielectric substrate; a ground plane located on the dielectric substrate, and having a grounding point; a radiating portion, comprising: a supporting substrate; a coupling metal strip located on the supporting substrate; and a radiating loop-shaped metal strip located on a single surface of the supporting substrate wherein the length of the radiating loop-shaped metal strip is substantially ¼ wavelength of the lowest resonant frequency of the antenna, and the radiating loop-shaped metal strip has a first section, a second section, a first end portion, a second end portion and a shorting point, and the first end portion is roughly parallel with the coupling metal strip, and the shorting point is located near the second end portion and electrically connected to the grounding point of the ground plane, and an end of the second end portion is connected to the shorting point, and another end of the second end portion is a free end, and the coupling metal strip is located between the first end portion and the second end portion, and the first section is connected to the first end portion and extending perpendicular to the coupling metal strip, and the second section is parallel to the first section; and a matching component group located on the dielectric substrate, and one terminal of the matching component group electrically connected to the coupling metal strip of the radiating portion, and the other terminal of the matching component group connected to a signal source.