Patent ID: 7541985

Claim:
A multi-broad band antenna, comprising: a first radiating body exciting a first resonant mode, such that the multi-broad band antenna has a high frequency bandwidth; a second radiating body exciting a second resonant mode, such that the multi-broad band antenna has a middle frequency bandwidth; a third radiating body exciting a third resonant mode, such that the multi-broad band antenna has a low frequency bandwidth; a plurality of T-shaped symmetric structures selectively disposed on the first radiating body, the second radiating body, and the third radiating body to expand the bandwidths of the high frequency bandwidth, the middle frequency bandwidth and the low frequency bandwidth; a grounding plate; and a plurality of short-circuit elements connecting the first radiating body, the second radiating body, and the third radiating body to the grounding plate respectively; wherein radiation patterns of the first resonant mode, the second resonant mode, and the third resonant mode do not disturb each other.