RFID tags and pre-concentration technologies have been around since 1970, but until recently it was too expensive to use RFID tags on a large scale.
Initially, RFID tags were used to track large items such as cows, railroad cars, and air luggage for long-distance transportation.
These raw tags, known as inductive coupled RFID tags, are complex systems consisting of metal coils, antennas and glass.
The inductive coupled RFID tag is driven by the magnetic field generated by the RFID reader.
Electrical and magnetic components are present--
Because of this, you can generate a magnetic field with electricity, and you can generate a current with a magnetic field.
The name "inductive coupling" comes from this process ---
The magnetic field senses current in the wire.
You can learn more about how magnets work.
In order to reduce the technical cost, the capacitor coupling label is created next.
These are disposable labels that can be applied to less expensive items and are as generic as bar codes.
In order to transmit the data, the conductive carbon ink is used for the capacitor coupling label, not the metal coil.
The ink is printed on paper labels and scanned by readers.
Motorola's BiStatix RFID tag is the leader in the technology.
The silicon chips they use are only 3mm wide, storing 96-bit information.
The technology was not accepted by retailers, and BiStatix was shut down in 2001 [
Source: RFID log.
The latest innovations in the RFID industry include proactive, semi-proactive
Active and passive RFID tags.
These tags can store up to 2 K bytes of data, consisting of microchips, antennas, in the case of active and semi-active
Passive label, battery.
The components of the label are encapsulated in plastic, silicon, or sometimes glass.
On a fundamental level, each tag works the same way: RFID tags with inductive coupling and capacitive coupling are less commonly used today because they are both expensive and bulky.
In the next section, we will learn more about activities, half
Passive and passive RFID tags.