RFID (Radio frequency identification) communication
RFID (radio frequency identification) is automatic recognition technology that uses wireless communication. Here, data is encoded in an RFID tag which might be read by the reader.
What is the most important advantage of RFID?
- Electronic devices generally need a power source. But, RFID tags use a mechanism where we can send power to device, whenever the device needs it. (Electromagnetic field coupling)
- We don’t need a power source on RFID tags.
Kinds of RFID: Passive and Active
- Passive RFID: RFID tags have neither an electric plug nor a battery. Instead, all of the energy needed to operate them is supplied in the form of radio waves by RFID readers. This technology is called passive RFID.
- Active RFID: Here, there is a power source on the tag.
- Data can be read from longer distance. (for e.g., even if the tag is high, relatively inaccessible place) etc.
- Multiple tags can be read at once -> it obviates the need to hold item one by one in order to read the data.
- Data can also be read from outside the box unlike barcode/ QR code (without opening the box). It is also immune to things like dirt.
- A passive type RFID can be used semi-permanently without a battery.
- Since tag contains a memory, the data can be rewritten.
- It enables efficient inventory count at logistics center, backyard, and storefront.
- Incoming and outgoing record (e.g. FASTag at toll booths)
- Brand Protection: It is a useful tool to prevent grey market and counterfeit products of luxury brands.
- Tracking: Personnel, asset etc.
- Smart Keys (for doors)
- It takes longer to program an RFID tag (compared to QRCode)
- RFID can be intercepted easily, even if its encoded.
- Foil (2-3 layers of household foil) can dam the radio waves
- Privacy concerns: Anybody can access information about anything