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  What is RFID?

 

inlayRFID stands for Radio Frequency Identification, and the name speaks all. It is fundamentally a method of communication and identifying items, via the medium of air, through the frequencies of radio. The technology comes in a variety of formats that cope for each application that would benefit from it.

As any RFID configurations are concerned, the system needs two basic components; the reader (also called interrogator) and the tag.  As simple it may sound, the two basic components are really intricate; you need a microchip with an antenna for the tag, and a series of circuitry coupled to an antenna for the reader to send electromagnetic waves to sense the chip. The numerous configurations of antenna, frequencies and algorithm give this technology a different way of operating in different environments.

To understand how the readers and tags talk in layman sentences, imagine that you have a torchlight and a mirror.  Flick on the torch towards the mirror and you see light reflected. RFID works in the same manner although in a different set of physics law. An RFID reader emits electromagnetic signals where an RFID tag draws power from it. This power is then used to energize the microchip’s circuits. The chip then modulates the waves and sends back this modulated wave to the reader. This process is called backscattering where the reader sees the tag.

RFID is a technology derived from science of radio waves. While the paragraph above straightforwardly explains how it works, there are plentiful other ways that the tags can respond to a reader’s signal. You can read more about the physics behind RFID at Wikipedia.

All that matters is that it does some degree of magic. When you can track an item without really seeing it, plus you can have the ability of doing so at a distance, you seeing the world with a new set of perspective.

Generic types of rfid TAGS

RFID comes in many shapes and forms. There are many varieties to choose from, depending on the requirement of cost and degree of implementation. Generally RFID tags are divided in these categories apart from their frequency classification:

Passive RFID

This is the most affordable type of RFID. The tag requires no power, thus the need of batteries are eliminated. Complicated power circuity is waived hence the tag manufacturing cost is minimal.

Most suitable for item level tagging. Read range can go as far as 7meters using the UHF frequency.

Our company focuses in this type of RFID . We provide various designs and versatility of tags that suit different needs.

 

Semi passive

This type of tags are very similar to passive tags except for the incorporation of a battery. The battery only powers the chip and not the transmitting signal.

The addition of the small battery enables the tag to offer a higher sensitivity, almost a hundred times more than the traditional passive tag.

Tags that are semi-passive are expensive, but not as expensive as the active tags.

 

Active RFID

Active tags or beacons are the most robust among the three. It offers the longest read range, larger memory and the ability to co-work with other sensors e.g. temperature sensors.

Active tag has the most expensive price among the three.

If your RFID application demands long range, perfect reading and sensor readings, then the active tag is right tag for you.

 

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