A RFID reader (Radio Frequency Identification reader) is a device that is used to gather all the information from an RFID tag. This device is used to track the individual objects. The means of this interrogation is wireless and as the distance is short thus the line of sight between the tags and the reader is not necessary. A RFID reader consists of an RF module that acts as a full duplex i.e. transmission and reception of radio frequency signals both at a same time.
The transmitter consists of an oscillator, modulator and an amplifier.
- The oscillator creates the carrier frequency.
- The modulator impinges the data command on this carrier frequency.
- The amplifier boosts the signal to awaken the tag.
The receiver consists of a demodulator and amplifier.
- Demodulator extracts the refunded data.
- Amplifier strengthens the processing of signal.
A microprocessor forms the control unit. This control unit consists of an operating system to filter and memory to store the data.
There are three types of RFID reader:
- Fixed RFID Reader
- Mobile RFID Reader
- Handheld RFID Reader
Fixed Reader: Fixed readers are used for large-scale deployments like dock doors, conveyor belts and other tracking tools, parts and equipments. Fixed RFID readers need access to ground power source and are usually connected by USB, RJ cables etc.
Mobile Reader- Mobile reader is used for areas where it is hard to reach areas and install fixed reader. This robustness is suitable for forklifts and other moving vehicles. If mobile RFID reader is self-contained with its own battery and antenna, their wireless communication allows them to connect with a network from trolley and cart.
Handheld Reader- These are light, ruggedly built and compact to withstand being mishandled. By tethering a cable to RFID reader one can assure himself of having proper communication and constant power to a network.