Reader/writer and RFID system

Abstract

A reader / writer includes two antennas that perform reading / writing of information from / to wireless tags that are moving. The antennas are positioned in such a manner that their communication ranges have an overlap along a route in which the wireless tag moves.

Description

technical field [0001] The present invention relates to read / write processing of removable wireless tags. Background technique [0002] In recent years, a technology called RFID (Radio Frequency Identification) has attracted widespread attention from society, and the application of RFID systems is also becoming popular. For example, RFID tags can be attached to commodities, and by reading information from these tags or writing information to these tags, the commodities can be managed. [0003] RFID has been used in many fields, such as manufacturing, logistics distribution, entertainment, and leasing. Furthermore, there is also a great demand for the use of RFID systems on moving objects. For example, apply RFID systems to manufacturing plants and logistics departments to manage products or production materials conveyed on belt conveyors; or apply them to airports to manage luggage. Furthermore, RFID systems are widely used to manage slow moving objects such as pedestrian...

AI Technical Summary

Problems solved by technology

However, the allowable communication range between these tags and antennas cannot be extended

Because of this limitation, it is also impossible to extend the allowable communication time between these tags and the antenna, so there is a problem of not being able to move the tags at high speed

In addition, since the order of moving tags cannot be recognized, there is a problem that the speed of the tags must be set low in order for the reading device and the tags to communicate

[0020] On the other hand, the second conventional technique described above reduces the possibility of overlapping response signals from multiple transponders due to switching the order of two or more transmit / receive antennas at different positions

However, it cannot expand the communication range between the tag and the antenna

This is because the limitation of the permissible communication time between the tag and the antenna cannot be extended, thus causing the problem that the tag cannot be moved at high speed

Also, when communicating with multiple tags, it is not possible to identify the order in which tags are moved

The problem with this is that the speed of the tag must be set lower according to the allowable communication time between the reading device and the tag

Images