RFID readers are basically produced with different technologies according to different frequencies. These can be counted as LF, HF, UHF readers. While LF and HF readers are used to identify passive RFID tags, UHF RFID readers can read passive and semi-active (BAP-Battery Assisted Passive) tags. For reading tags operating at Bluetooth and UWB frequencies, a device that is actually a tag may be sufficient. For this reason, devices used to read active tags and tags operating at microwave frequencies and above are generally not called readers. Apart from fixed RFID readers, there are also handheld terminals (mobile RFID readers). These can read from a shorter distance but are widely used especially in places where operators are on the move such as warehouses, factories and production sites. There are many RFID reader brands in the world. Click for RFID reader alternatives!
As we will explain many times in these pages, RFID tags are divided into two according to their energy sources:
- Passive RFID Tags
There is no need to write long. RFID tags that do not work with batteries are called passive RFID tags. It is necessary to remind a very confusing issue; the passive RFID tag has nothing to do with the encoding of the chip. They can be read from 10-15 meters. HGS tags used on the windows of vehicles in traffic are the best example.
- Active RFID Tags
To explain in a short way, battery-powered RFID tags with a battery on it are called active RFID tags. They can be read from a longer distance (100+ meters), but they have a problem such as the battery running out. They are also expensive. The OGS tags we use in vehicles are the best example.
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They are passive devices that are attached to RFID readers and are usually supplied with 3-5 meter cables. In general, 2 or 4 antennas can be installed in an RFID reader. Some RFID readers may have 8 ports, in which case 8 antennas can be installed, or it may be possible to install more antennas with additional hardware.
There are generally linear or circular antennas on the market. If you don’t know which antenna is the most suitable for your needs, you can consult us.
If you want to learn what RFID is as well as RFID components, you can read this article.