How Does an RFID Tag Work?
An RFID tag works by using radio waves to transmit a stored identifier to an RFID reader. Each tag contains a small chip (holding the ID) and an antenna. When the tag enters the reader's electromagnetic field, the passive tag draws power from the reader's signal and reflects back its data - no battery needed. Active tags use a battery to broadcast over longer distances.
Why Choose IDrfid
Chip & Antenna
Every tag has a chip for data and an antenna for radio communication.
Passive vs Active
Passive tags harvest reader energy; active tags use a battery for longer range.
No Line-of-Sight
Unlike barcodes, RFID reads tags without direct visual contact.
Batch Reading
Readers can read multiple tags simultaneously in milliseconds.
Technical Specifications
| Components | Chip + antenna + substrate |
| Power | Passive (reader-powered) or active (battery) |
| Frequencies | LF 125kHz / HF 13.56MHz / UHF 860-960MHz |
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Frequently Asked Questions
Do RFID tags need a battery?
Passive RFID tags need no battery - they draw power from the reader's signal. Active tags use a battery for longer range.
What is inside an RFID tag?
An RFID tag contains a microchip that stores data and an antenna that communicates with the reader.
Can RFID read without line of sight?
Yes, RFID reads tags through packaging and without direct visual contact, unlike barcodes.
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