What is RFID? How RFID works? Video Explained

In this video, RFID (Radio Frequency Identification) Technology has been explained. What is RFID, what is inside this RFID system, how does RFID work, and the application of RFID have been explained?

What is RFID?

RFID is a technology that works on radio frequency and is used to auto-identify different objects. The RFID system mainly consists of two parts.

1) RFID Reader or Interrogator

This RFID reader continuously sends radio waves of a particular frequency in this RFID system. If the object to which this RFID tag is attached is within the range of these radio waves, it sends the feedback back to this RFID reader. And based on this feedback, the RFID reader identifies the object.

2) RFID Tags

RFID tags: Now, three different kinds of RFID tags are commercially available.

1. Passive tags
2. Active tags
3. Semi-passive tags

These passive tags do not have any power supply. They used to get their power from the incoming radio waves from the Readers. At the same time, active tags have a power source for their internal circuitry. And for sending the response to the Reader also, it uses its power supply. Semi-passive tags have a power supply for internal circuitry, but sending the answer relies on the radio waves received from the Reader.

Operating Frequency:

This RFID system is mainly operated in three frequency bands.

1. LF: Low-Frequency band
2. HF: High-Frequency band
3. UHF: Ultra High-Frequency band

The exact frequency of operation varies from country to country.

Operating Principles:

Most RFID systems operate on any of these two principles.

1. Load Modulation
2. Backscattered Modulations

Applications of RFID:

1. Institutions: Library, Hospitals, Schools, and Colleges
2. Transportation and Logistics
3. Access Control
4. Sports
5. Animal Tracking

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Source: All About Electronics

Source: All About Electronics