Multi-antenna ultrahigh frequency electronic tag reader

Abstract

The invention discloses a multi-antenna ultrahigh frequency electronic tag reader. Besides a receiving module, a transmitting module, a digital processing circuit, a phase-locked loop module, a power supply, a communication module and a master control module, the reader further comprises an antenna module and a switch module, wherein the antenna module comprises a plurality of antennae, the switch module comprises a plurality of directional coupling devices, a first one-to-many switch and a second one-to-many switch, the public end of the first one-to-many switch is connected with the transmitting channel output of the transmitting module, multiple ports of the first one-to-many switch are respectively connected with the transmitting port of each directional coupling device, the public port of each directional coupling device is connected with the corresponding antenna, the receiving port of each directional coupling device is connected with multiple ports of the second one-to-many switch, and the public port of the second one-to-may switch is connected with an antenna detection module and the receiving module. With the multi-antenna ultrahigh frequency electronic tag reader, cost is lowered, the antenna switch is not likely to be damaged, and the system reliability is improved.

Description

technical field [0001] The invention belongs to the field of electronic tags (RFID), and relates to an ultra-high frequency electronic tag reader, in particular to a multi-antenna ultra-high frequency electronic tag reader. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology. Its basic principle is to use radio frequency signals and spatial coupling transmission characteristics to automatically identify target objects and obtain relevant information to achieve automatic identification. As a key technology, RFID has attracted more and more people's attention due to its many convenient features and wide application fields. RFID technology has a very broad application prospect. It can be applied to various fields such as warehouse management, identification, transportation, food medical treatment, animal management, access control and anti-theft, and industrial military in logistics and warehousing. It has bro...

AI Technical Summary

Problems solved by technology

[0006] However, the existing readers generally directly add the switch expansion board to the original single-antenna reader. In this way, the original layout does not need to be changed, and the control software can be slightly modified. The cost and difficulty are relatively low, but the reliability is not high. , the antenna switch is easily damaged, and each antenna needs an independent antenna detection circuit, and the antenna detection is more complicated. If the antenna detection is added, the cost will be significantly increased. Although the simple short-circuit antenna is convenient for detection, it has too many limitations on the antenna, and Simply measure open circuit and short circuit to judge that the electrical performance of the antenna is not good enough to protect the system

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