contactless communication technology

Basics

Radio frequent identification (RFID) technologies are automated identification systems, which in recent years have very successfully been installed for many different applications.
It is a contactless communication-technology, which provides information on identification of people, animals, goods and machines.

In many cases the barcode is no longer sufficient in the identification processes. Barcodes are of course cheap to create, but they are limited in their storage capacity and are not flexible, when data needs to be changed.

The transmission of data through electro-magnetic waves is much more flexible. Such transponder data carriers (tags) are available for many different applications can be packaged in many different ways. They are high-performance code-carriers which only need very small space. They do not need any servicing, as they are passive and don’t have their own source of energy.
The RFID-Reader direct the routine for communication with the transponder.

The Read/write distances can also be influenced by the size of the transponder and especially the antenna. An external data-interface transmits the data for verification for example with a database on your computer.

There are two different RFID technologies available:

Passive tags
have no own power source and take their energy directly from the magnetic field of the reader. Passive RFID tags don’t need any maintenance, but the reading distance depends on the size and frequency of the transponder and antenna.

Active tags are much more complex than passive tags and have an internal battery to increase the reading distances. The life time of active tags is limited through the battery. The manufacturing is very expensive, that’s the reason why the price for active systems is much higher compared to passive systems.

There are systems with 134kHz, 125kHz, 13.56MHz, 868MHz, 915MHz, 2.45GHz available, every system has different properties and reading distances depending on the environmental conditions.

Please contact our RFID team - We’ll help you to find the best hardware for your application!

Reading System:

The tag consists of a microchip, as well as an antenna, which are usually put in some form of casing for protection against different environments. Therefore tags can be used in the harshest environments. RFID systems can also identify and write on tags when they are covered by non-metallic materials.

The RFID read/write device (RFID Reader) creates a weak electro-magnetic field. If a RFID tag passes this field, the microchip of the transponder wakes up and can send or receive data without any contact to the reader. If the tag leaves the field, the communication gets interrupted and the chip on the tag stops working, but the data on the tag keeps stored.

High end reading systems are able to communicate to several tags in the magnetic field simultaneously, such functions are called “anticolision”. The magnetic field of the reader can read through non-metallic materials like wood, paper or plastic covers.