I can confirm the tech. The construction of this device is such that it has a large effective range (possibly up to 100 yards if not more), unlike RFIDs worked into cards. For these, the antenna is constructed by swirly PCB / substrate tracks. The device depicted in this article has a ferrite core coil, indicating a much bigger sensitivity.
RFID tech is such that besides DATA, also POWER is transferred to the device. The sender signal is powerful enough to generate the required power for operation in the RFID circuit. That's why these never need any sort of batteries to operate.
Eh 100 yards is pretty generous for a passive UHF tag of that size. I say UHF because it has the highest propagation distance, so it's an assumption, but trying to give you the benefit of the doubt. I tihnk it's more likely these are like the ones they implant in dogs which have a read range of a few mm. I would give it 50 feet max. Implantable RFID tags are mostly used for cattle/livestock tracking.
The only way you could get 300 ft+ of range is by using a tag with a phased array antenna, which is not implantable and requires a good amount of surface area, so it couldn't go undetected.
No problem, I might be off on the distance. The 100 yards was a guestimate based on size and method. A max of 50ft for the tag types you described is quite acceptable. They have a much bigger range than the 'chip' type transceivers in bank cards though.
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ArtificalDuality ago
I can confirm the tech. The construction of this device is such that it has a large effective range (possibly up to 100 yards if not more), unlike RFIDs worked into cards. For these, the antenna is constructed by swirly PCB / substrate tracks. The device depicted in this article has a ferrite core coil, indicating a much bigger sensitivity.
RFID tech is such that besides DATA, also POWER is transferred to the device. The sender signal is powerful enough to generate the required power for operation in the RFID circuit. That's why these never need any sort of batteries to operate.
RFID tags however are common tech. Much more advanced tech is available in regards to integrating electronics into living things. Peruse Science Daily to see what's possible today.
wellendowedduckling ago
Eh 100 yards is pretty generous for a passive UHF tag of that size. I say UHF because it has the highest propagation distance, so it's an assumption, but trying to give you the benefit of the doubt. I tihnk it's more likely these are like the ones they implant in dogs which have a read range of a few mm. I would give it 50 feet max. Implantable RFID tags are mostly used for cattle/livestock tracking.
The only way you could get 300 ft+ of range is by using a tag with a phased array antenna, which is not implantable and requires a good amount of surface area, so it couldn't go undetected.
ArtificalDuality ago
No problem, I might be off on the distance. The 100 yards was a guestimate based on size and method. A max of 50ft for the tag types you described is quite acceptable. They have a much bigger range than the 'chip' type transceivers in bank cards though.
wellendowedduckling ago
Oh yeah... for sure. Bank card chips aren't designed for distance, for obvious reasons haha.