Patent ID: 7768460

Claim:
A multi-band antenna, comprising: a grounding plate; a radiating element having a level radiating portion disposed a predetermined distance away from the grounding plate, a first connecting portion connecting the level radiating portion with the grounding plate, and a feeder point; and a parasitic element having a substantially L-shaped parasitic portion disposed a predetermined distance away from the grounding plate and a second connecting portion connecting a free end of the L-shaped parasitic portion with the grounding plate, the L-shaped parasitic portion being substantially at the same plane as and spatially fencing the level radiating portion to define a substantially L-shaped space for capacitively coupled with the level radiating portion, the second connecting portion and the first connecting portion being substantially disposed at the same side of the grounding plate, wherein the level radiating portion has a substantially n-shaped base, the n-shaped base has a long piece and two short pieces connecting two sides of the long piece, and the L-shaped parasitic portion spatially fences the long piece and one of the short pieces to form the L-shaped space, and wherein the short piece near the L-shaped parasitic portion extends towards the other short piece to form a first radiating strip.