| 摘要 |
A system and method for verifying the occurrence of an environmental condition is disclosed. Rather than store information concerning the occurrence and/or success of the sterilization process, the present invention modifies the wireless transmission characteristics of the device. In some embodiments, the bandwidth of the wireless transceiver is altered as a result of undergoing sterilization. In other embodiments, the resonance frequency of the circuit is affected. In other embodiments, one or more of these parameters are affected based on other environmental conditions, such as shock or vibration. |
| 主权项 |
1. A wireless identification device, comprising:
an RFID integrated circuit, and an external circuit, adapted to tune the frequency of wireless transmissions, said circuit comprising an inductor, a capacitor, a resistor, a first variable component and a second variable component, wherein said first variable component and said second variable component each have an open state and a closed state, wherein said state of the first variable component is determined based upon exposure to a first environmental condition, wherein said state of the second variable component is determined based upon exposure to a second environmental condition, and wherein said inductor, capacitor, resistor, first variable component and second variable component determine the wireless characteristics of said device, wherein said first variable component affects only one of bandwidth or resonant frequency and said second variable component affects only one of bandwidth or resonant frequency. |
