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| Pet ID chip range - theoretical limit |
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| fcb:
So one of our cats has gone missing (actually my favourite cat) and we fear the worst. She is ‘chipped’. Got me thinking about the RFID chip and what is the theoretical range limit would be for: 1. Detecting presence of an RFID. 2. Reading the RFID chip. Anyone know if there is a fundamental limit to reading these or what defines it, even with an impractically large antenna or multiple antennae or requires some TEC cooled receiver etc.. |
| Benta:
About the same as the loop antenna diameter. It's not just about detecting, it's about powering the RFID chip from the antenna. |
| Cerebus:
--- Quote from: fcb on July 25, 2021, 08:45:07 pm ---So one of our cats has gone missing (actually my favourite cat) and we fear the worst. She is ‘chipped’. --- End quote --- Sorry to hear that. Word of advice: don't let the other cats hear you saying that bit about "favourite cat". |
| fcb:
--- Quote from: Benta on July 25, 2021, 09:13:24 pm ---About the same as the loop antenna diameter. It's not just about detecting, it's about powering the RFID chip from the antenna. --- End quote --- So a ten foot diameter loop would perhaps have a ten foot range? Presumably powering the RFID is about getting the field strength right and the read back is done with some sort of backscatter or change in impedance. And thanks Cerebus for the advice - both the remaining cat and the doggo knew something was up before I did. |
| Benta:
The RFID pellets implanted in animals consist of a parallel tank circuit tuned to a certain frequency, the coil at the same time delivers power to the chip, and the chip responds by modulating the tank circuit. Quite simple, really. |
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