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Cash Register Lines System Using UHF RFID

More and more retail chains today have the need for automated monitoring of the number of customers in cash register lines in real time. Previously developed systems have proved to be insufficiently effective because they involved additional and unpleasant interaction between customers and employees or monitoring in the way that threatens the privacy of customers. To avoid such problems, it was necessary to design different solution which would implement new technologies. Technology that makes development of system like this possible is RFID.

RFID is the wireless non-contact use of radiofrequency electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to objects. Every RFID system consists of several basic elements:

 1. RFID Reader  2. RFID antennas and tags
 Split-Type 4 Ports Fixed RFID Reader  RFID antennas and tags

The idea is to put readers and antennas on cash registers and tags on shopping carts and baskets. When a tag on the shopping cart or basket is read as present for a certain period of time in front of cash register, system recognizes that the customer is standing in that line. This way it can be determined how long is the line in front of cash register and in case that it is too long, system sends SMS to store manager that more cash registers should be open. Also, if the lines are too short, store manager gets information that some case registers should be closed.

All long-range systems operate using electromagnetic waves in the UHF and microwave range. The vast majority of such systems are also known as backscatter systems due to their physical operating principle. In addition, there are also long-range systems using surface acoustic wave transponders in the microwave range. Ranges of 15 m and above can be achieved using active (battery-supported) backscatter transponders.

Tags can be passive or active considering the battery presence. Passive RFID tags don't have any power source (battery). Electromagnetic field of the reader provides all the energy necessary for tag to work via tag antenna. This means that the emitted energy of the reader is used to transfer data from reader to tag and from tag to reader.

Cash register lines optimization system using RFID offers automated monitoring of number of customers in cash register lines without uncomfortable interaction between customers and employees of the store and also without threatening customers privacy. The whole system is designed to be easily upgradable with many additional features and integrated with already existing solutions in stores. All the newest technologies in the field of RFID wireless communications and also web applications have been used.

For further development, we recommend using active tags to reach an optimal range of 12 m. Also, for better communication between tag and the reader, we recommend using narrow radiation pattern antenna.

Tags : Passive RFID Tags RFID antennas and tags RFID Reader

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