Patent ID: 6828939
Filing Date: 2004-12-07
Classification: H01Q

Abstract:
A multi-band antenna having a first frequency and a second frequency substantially lower than the first frequency, the multi-band antenna comprising:(a) a dielectric plate; (b) a first metal foil disposed on a surface of the dielectric plate, comprising: a first plate; a second plate including a first signal-fed point; two first stripes wherein the length of each stripe is equivalent to one fourth wavelength of the first frequency; two first connecting plates for connecting the two first stripes and the second plate; and a connecting bar for connecting the first plate and the second plate, and the total length of the first plate, the connecting bar and the second plate being equivalent to one fourth wavelength of the second frequency; and (c) two second metal foils disposed on the surface of the dielectric plate and spaced at a distance to the first metal foil, each of the second metal foils comprises: a second stripe whose length is equivalent to one fourth wavelength of the second frequency; a third stripe whose length is equivalent to one fourth wavelength of the first frequency; and a second connecting plate for connecting the second stripe and the third stripe.