Patent ID: 7609213

Claim:
A two-branch broadband antenna comprising: a ground plane; and a radiating portion, which is substantially a planar structure, comprising: a first radiating arm with length of 0.25 times of a first center frequency about 700 MHz, being a first U shape, the first radiating arm comprising: a first part having a closed end located near an edge of the ground plane, which is a feeding portion of the antenna; a second part extended from the first part and perpendicular to the first part; a third part extended from the second part and parallel to the first part; and a fourth part extended from the third part and perpendicular to the first part and having an open end; and a second radiating arm with length of 0.25 times of a second center frequency about 500 MHz being a second U shape, opening of the second U shape being opposite to opening of the first U shape, the second radiating arm comprising: a fifth part perpendicular to the first part and having a closed end connected to the first part a sixth part extended from the fifth part and parallel to the first part; a seventh part extended from the sixth part and perpendicular to the first part; an eighth part extended from the seventh part and parallel to the first part; and a ninth part extended from the eighth part and perpendicular to the first part and having an open end extended toward the open end of the fourth part with a predefined distance; wherein the radiating portion is not connected to the ground plane.