Patent ID: 7817043

Claim:
A radio frequency tag comprising: a plurality of RF resonance circuits provided on a surface of a substrate, the plurality of RF resonance circuits having resonance frequencies different from each other, each of the plurality of RF resonance circuits comprising: a coil; a first capacitor; a first connecting wire, wherein the coil is connected to the first capacitor by the first connecting wire; a second capacitor; and a second connecting wire, wherein the first capacitor is connected to the second capacitor by the second connecting wire, wherein the first capacitor and the second capacitor are each independently short-circuited, wherein each of the plurality of RF resonance circuits has three values of resonance frequencies, and of the plurality of RF resonance circuits, the three values of resonance frequencies of each of at least a first RF resonance circuit and a second RF resonance circuit are different from each other, wherein the coil, a lower electrode of the first capacitor, and a lower electrode of the second capacitor of the first RF resonance circuit, and the coil, a lower electrode of the first capacitor, and a lower electrode of the second capacitor of the second RF resonance circuit, respectively comprise a same material, wherein an upper electrode of the first capacitor, an upper electrode of the second capacitor, the first connecting wire, and the second connecting wire of the first RF resonance circuit, and an upper electrode of the first capacitor, an upper electrode of the second capacitor, the first connecting wire, and the second connecting wire of the second RF resonance circuit, respectively comprise a same material, wherein the coil, the lower electrode and the upper electrode of the first capacitor, and the lower electrode and the upper electrode of the second capacitor, of the first RF resonance circuit, are disposed on a same surface of the substrate, wherein the coil, the lower electrode and the upper electrode of the first capacitor, and the lower electrode and the upper electrode of the second capacitor, of the second RF resonance circuit, are disposed on the same surface of the substrate, wherein the first capacitor and the second capacitor of the first RF resonance circuit are disposed in an in-plane direction of the same surface of the substrate, and are disposed outside of a ring of the coil of the first RF resonance circuit, and the upper electrode of the first capacitor and the upper electrode of the second capacitor are disposed in the in-plane direction of the same surface of the substrate, and wherein the first capacitor and the second capacitor of the second RF resonance circuit are disposed in an in-plane direction of the same surface of the substrate, and are disposed outside of a ring of the coil of the second RF resonance circuit, and the upper electrode of the first capacitor and the upper electrode of the second capacitor are disposed in the in-plane direction of the same surface of the substrate.