Antenna structure and electronic device

An electronic device comprising an antenna structure, the antenna structure comprising:

• a branching radiator comprising a plurality of first radiation modes;
• a ring-shaped radiator surrounding the branching radiator, and comprising a plurality of second radiation modes;
• a feeding point and a grounding point, one of which is connected to the ring-shaped radiator, and the other is connected to the branching radiator;
• an antenna gap, which is provided between the branching radiator and the ring-shaped radiator, the ring-shaped radiator and the branching radiator being coupled through the antenna gap to form coupled radiation modes, a coupling among the first radiation modes, the second radiation modes and the coupled radiation modes broadening a radiation bandwidth of the antenna structure;
• wherein the branching radiator is connected to the feeding point, and the branching radiator comprises a first radiation branch located at one side of the feeding point and a second radiation branch located at the other side of the feeding point, resonance frequencies generated by the first radiation branch and the second radiation branch being different;
• the grounding point is connected to the ring-shaped radiator, and the first radiation mode comprises a radiation mode of two times a quarter wavelength, the radiation mode of two times a quarter wavelength generating a resonance in a frequency band of Wifi 2.4G, and the wavelength being a free space wavelength corresponding to a center frequency of Wifi 2.4G, and
• the grounding point is provided at an intersection of a symmetric line of the ring-shaped radiator and any side of the ring-shaped radiator, the intersection being a point with a high electric current when the first radiation mode is a radiation mode of two times a quarter wavelength or a point with a high electric current when the second radiation mode is a radiation mode of two times a half wavelength, the feeding point is provided at the symmetric line of the ring-shaped radiator.