Three-dimensional reading device of radio frequency label

Abstract

The invention relates to a three-dimensional reading device of a radio frequency label. The device comprises a flat board antenna and a radio frequency reader writer, wherein the flat board antenna is distributed with multiple radio frequency antennas used for emitting radio frequency signals, the radio frequency antennas are parallelly and sequentially distributed from down to up in a staggered mode, the radio frequency reader writer comprises a switching control module used for switching and conducting the radio frequency antennas, a radio frequency module used for establishing connection with the radio frequency antennas after conduction of the radio frequency antennas and sending the radio frequency signals to the radio frequency antennas, switching and control signals generated by the radio frequency reader writer are received by the switching control module and identified, and the corresponding radio frequency antennas are switched and conducted. The radio frequency module is used for establishing connection with the conducted radio frequency antennas and sending the radio frequency signals generated by the radio frequency reader writer to the radio frequency antennas, and the radio frequency antennas are used for sending out the radio frequency signals. Through the device, reading missing can be effectively prevented, and the reading success rate is improved.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification, in particular to a three-dimensional reading device for reading radio frequency tags based on a planar antenna. Background technique [0002] In the field of existing radio frequency identification technology, the radio frequency identification system generally includes a radio frequency antenna, a read-write module for controlling the transmission and reception of radio frequency signals, and a radio frequency tag fixed on the item to be identified. When in use, the radio frequency antenna outputs radio frequency signals. The tag is read, and the information carried on the RF tag is fed back to the signal receiving circuit in the read-write module through the RF antenna. After processing the received information, the ID identification of the RF tag and the object it represents can be completed. . In this system, the radio frequency antenna is an important part of the enti...

AI Technical Summary

Problems solved by technology

In the prior art, there are two main ways to realize the three-dimensional reading of tags by using frame-shaped antennas overlapping and complementing each other. One method is that the antenna array adopts the overlapping and complementing form of two rectangular antenna frames. Due to the limitation of the antenna frame height, two The height of the channel device composed of the frame antenna is low, so the readable area of ​​the tag is small. In practical applications, when the tag passes through the channel device at a high height, there may be missed readings. If you want to increase the readable area of ​​the tag In the reading area, the height of the antenna frame needs to be increased. At this time, the area of ​​the blind area also increases accordingly, so the overlapping area of ​​the two antenna frames needs to be increased at the same time. However, because the two complementary frame antennas work in polling, the non-working antenna It will have a negative effect on the working antenna. The increase of the overlapping area will increase the degree of mutual coupling between the antennas, and the reading effect will be poor; another method is that the antenna array adopts the form of three overlapping and complementary rectangular antenna frames. The height of the channel device composed of antennas is high, so the readable area of ​​the tag is large. However, since the three antennas poll and the antenna polling time is constant, the time for each antenna to read is reduced. When multiple tags pass through at the same time When the channel is installed, due to the short time, there may be missing readings

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