The invention discloses a multifrequency antenna which comprises a lower
metal earth plate, a medium substrate, a
radiation patch and a feed connector. The medium substrate is arranged on the lower
metal earth plate, the
radiation patch is arranged on the medium substrate, a feed needle at the center of the feed connector is connected with the
radiation patch, and an earth terminal of the feed connector is connected with the lower
metal earth plate. The radiation patch is provided with four arc slots, the four arc slots are uniformly distributed on the same circumference, and rectangular slots are further arranged at ends of the arc slots along two symmetric lines of the four arc slots. The multifrequency antenna is easy in
processing, manufacturing and mounting, is capable of realizing better
impedance matching, can be applied to various systems such as
GSM (
global system for mobile communications) / 3G (the 3rd generation telecommunication) / WLAN (
wireless local area network). By the aid of two pairs of arc slots and four pairs of convex slots on the outer side of the patch of a plane
slot antenna,
current distribution on the surface of the patch can be changed, three
resonance points can be excited, and three-frequency operating characteristic can be achieved.