Passive tamper-resistant seal and applications therefor
A ribbon comprises a substrate, and a plurality of seals on the substrate. Different seals detune in response to differing tensile loads. At least one of the seals comprises a surface acoustic wave (SAW) radio frequency identification (RFID) seal.
1. A ribbon comprising:
a substrate; and
a plurality of seals on the substrate, different seals detuning in response to differing loads, wherein at least one of the seals comprises a surface acoustic wave (SAW) radio frequency identification (RFID) seal.
2. The ribbon of claim 1 , wherein each seal detunes in response to a differing load.
3. The ribbon of claim 2 , wherein the SAW RFID seal comprises at least one antenna, an inter-digital transducer (IDT) and at least one set of reflectors.
4. The ribbon of claim 3 , wherein the IDT comprises two arrays each comprising six electrodes.
5. The ribbon of claim 3 , wherein at least one of the reflectors is used for calibration.
6. The ribbon of claim 3 , wherein at least one of the reflectors is used for error correction.
7. The ribbon of claim 3 , wherein the antenna outputs a signature in response to a scanning signal.
8. The ribbon of claim 3 , wherein the SAW RFID seal comprises a first antenna configured to receive a scanning signal and a second antenna configured to output an identification (ID) of the SAW RFID seal.
9. The ribbon of claim 7 , wherein the scanning signal ranges from about 860 to 960 MHz.
10. The ribbon of claim 7 , wherein the scanning signal is any one of about 300 KHz, 13.56 MHz, 30 MHz, 433 MHz, 2.4 GHz, 5.6 GHz and 12.9 GHz.
11. The ribbon of claim 1 , wherein at least another of the plurality of seals is an RFID seal.
12. The ribbon of claim 11 , wherein the RFID seal comprises an antenna and a tag tuned to said antenna, said tag becoming detuned in response to said differing load.
13. The ribbon of claim 12 , wherein each tag outputs a signature in response to a scanning signal when tuned to said respective antenna.
14. The ribbon of claim 13 , wherein each tag resonates in response to said scanning signal when tuned to said respective antenna and outputs a code unique to said tag.
15. The ribbon of claim 14 , wherein said scanning signal is of a predetermined frequency.
16. The ribbon of claim 12 , wherein each antenna comprises a main antenna portion and at least one break-away portion coupled to said main antenna portion, said at least one break-away portion separating from said main antenna portion in response to said differing load.
17. The ribbon of claim 16 , wherein said at least one break-away portion is coupled to said main antenna portion by one-time contacts.
18. The ribbon of claim 16 , comprising a plurality of break-away portions at spaced along locations along the antenna.
19. The ribbon of claim 11 , wherein the RFID seal is a passive RFID seal.
20. The ribbon of claim 1 , wherein the load is selected from the group comprising tensile, parallel, perpendicular and longitudinal loads.