Patent ID: 8022881

Claim:
A multiband antenna comprising: a ground plane; a substrate, the substrate having a side adjacent to a side of the ground plane; and a radiating metal element disposed on a surface of the substrate, the radiating metal element comprising: a radiating portion having a slit for exciting a rejected frequency band to generate an operating frequency band for the multiband antenna; a shorting portion having a first end electrically connected to the radiating portion and a second end electrically connected to the ground plane, wherein the sum of the lengths of the shorting portion and the radiating portion is less than a quarter wavelength of a center frequency of the lowest operating frequency band of the multiband antenna; and a feeding portion surrounded by the radiating portion, the shorting portion and the ground plane, wherein the feeding portion comprises an antenna feeding point for electrically connecting to a signal source; a first spacing is formed between the feeding portion and the radiating portion, and a second spacing is formed between the feeding portion and the shorting portion.