Patent ID: 7057565

Claim:
A multi-band flat antenna comprising: multiple dielectric substrates; a first radiation unit created on at least two of the multiple dielectric substrates and operated in a first operation band, wherein the first radiation unit is constituted of differently-patterned conductive circuits that are electrically connected to form a three-dimensional meandering configuration; and a second radiation unit formed by conductive circuits and created on one of the multiple dielectric substrates where the conductive circuits of the first radiation unit are formed, wherein the second radiation unit is operated in a second operation band; wherein the first radiation unit and the second radiation unit are connected together at a common feeding node, wherein the connected first and second radiation units are further connected to a first feeding port through a signal transmission circuit; a third radiation unit formed by a conductive crooked circuit on one of the multiple substrates different to the substrates on which the conductive circuits of the first and the second radiation units are formed, wherein the third radiation unit is operated in a third operation band, wherein a position the crooked circuits forms corresponds to that of the signal transmission circuit.