Patent ID: 8179264

Claim:
A radio frequency identification tag device comprising: an antenna unit including: a rectangular dielectric substrate that has opposite first and second surfaces, and two opposite through holes that extend from said first surface to said second surface, a first conductive layer fully covering said first surface of said dielectric substrate, a second conductive layer formed over said second surface of said dielectric substrate, and patterned to form two opposite rectangular conductive patterns having the same size, said conductive patterns covering respectively said through holes in said dielectric substrate, and being spaced apart from each other to form a rectangular spacer therebetween, and two connecting conductors each disposed in a corresponding one of said through holes in said dielectric substrate and interconnecting electrically a corresponding one of said conductive patterns of said second conductive layer, and said first conductive layer such that said connecting conductors cooperate with said first conductive layer and said conductive patterns of said second conductive layer to constitute a radiator of said antenna unit; and a radio frequency identification module disposed to span said spacer in said second conductive layer and attached to said conductive patterns of said second conductive layer.