Design And Implementation Of A Handheld Ultra-high Frequency RFID Reader

In recent years,with the advancement of the Io T information industry wave,the development of radio frequency identification(RFID)technology as its key technology has been promoted in the industry.RFID technology mainly realizes non-contact information transmission through radio frequency signals to achieve the purpose of automatically identifying objects.Today,it is widely used in logistics,inventory management,transportation and other fields.At present,manual counting of linen before and after washing in traditional hotels has problems such as low efficiency,time-consuming,error-prone,etc.In response to the above problems,this article designs a handheld ultra-high-frequency RFID reader for linen management in hotels.This article first introduces the research background and significance of this topic,and analyzes the research status of UHF RFID readers and their key technologies.Then through market research and technical analysis,the reader's design indicators and requirements,the overall structure of the system is proposed.The system is mainly composed of a main control circuit,a radio frequency module,a Bluetooth module.The main control circuit is designed based on the STM32F405RGT6 processor,and its peripheral circuits are expanded according to the system function requirements.It mainly includes OLED display,buttons and sound Light reminder,low voltage detection,and USB communication,etc.The software design implements the main control circuit to control the radio frequency module,sends corresponding tag commands to the radio frequency module,processes,displays the received tag information,and uploads the tag data to the mobile phone application end via Bluetooth.In addition,in order to increase the data transmission volume and transmission rate of the system,while considering the size requirements of the handheld reader,this paper focuses on the design of a small,highperformance,circularly polarized microstrip antenna using a dual-point feed of a 3d B branch bridge.The performance of the antenna is optimized through theoretical analysis and simulation optimization.The test results show that the handheld reader designed by this project can quickly and accurately read the number of linen and achieve the expected design goal.