Patent ID: 8830034

Claim:
A wireless identification device, comprising: an RFID integrated circuit, and an external circuit, adapted to tune the frequency of wireless transmissions, said external circuit comprising an inductor, a capacitor, a resistor, a first variable component, wherein said first variable component has an open state and a closed state, wherein said state of said first variable component is determined based upon exposure to a first environmental condition, and a second variable component, wherein said second variable component has an open state and a closed state, wherein said state of said second variable component is determined based upon exposure to a second environmental condition, said second environmental condition is of a kind different than said first environmental condition, and wherein said inductor, said capacitor, said resistor, said first variable component and said second variable component determine a resonant frequency and bandwidth of said device, wherein said first variable component affects only said bandwidth and said second variable component only affects said bandwidth.