Patent ID: 7236141
Filing Date: 2007-06-26
Classification: H01Q

Abstract:
1. An antenna system for transmitting and receiving signals selectively in a first frequency band and a second frequency band, comprising: a first antenna unit including a feeding leg for coupling to a transceiver, and a plurality of interconnected elongated first metal strips, an adjacent two of said first metal strips cooperatively defining a first acute angle therebetween, each of said first metal strips having a first width; a second antenna unit coupled electrically to said first antenna unit, and including a plurality of interconnected elongated second metal strips, an adjacent two of said second metal strips cooperatively defining a second acute angle therebetween, each of said second metal strips having a second width; and a third antenna unit coupled electrically to said second antenna unit, and including a plurality of interconnected elongated third metal strips, an adjacent two of said third metal strips cooperatively defining said first acute angle therebetween, each of said third metal strips having a third width; wherein, said first acute angle is greater than said second acute angle and said second metal strips of said second antenna unit are located densely in such a manner to provide a resonant frequency by virtue of electromagnetic induction to fit the second frequency band.