Disclosed are a multiband antenna, having a composite right/left handed transmission line (CRLH-TL) periodic structure constituted by multilayer unit cells, and a communication apparatus using the antenna. The multiband antenna has a radiation element with a CRLH-TL periodic structure, formed by arraying at least one unit cell serving as a CRLH-TL in a dielectric carrier by means of a predetermined period, wherein said unit cell is formed into a multilayer structure such that a radiant line serving as a resonator is arrayed into layers.
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