A planar hyperband antenna includes a feed end, a radiating body and a grounding end. The radiating body includes a main body, a first radiating arm, a second radiating arm and a third radiating arm. The first radiating arm, the second radiating, and the third radiating arm extend from the main body and share the feed end cooperatively. The radiating body generates three resonant frequencies according to the radio frequency signals received by the feed end to make the first radiating arm, the second radiating arm and the third radiating arm form three different operating frequencies.