Design Of Software And Compact Antenna For UHF RFID Reader

RFID (Radio Frequency Identification) is one of the key technology in recent years. It is different with the tradition bar code, because of its smart identification method and multiple objects identification. With the development of IOT (Internet of Things), RFID as the key technology of IOT, spreads to the world. Especially the UHF RFID technology greatly promoted the development of logistics.The basic RFID system consists of RFID tag, reader and information process system. With the development of RFID markets, a kind of low cost, domestic handheld UHF RFID reader was needed by the market. In this paper, we proposed a handheld RFID reader with the module RMU900+, including the system design, software development and antenna design.RFID module RMU900+ works in the UHF band (920MHz 925MHz), which is Chinese standard. It provides Windows API for users. In this paper we developed the software for the reader based on the API, which can read tad, write tad and change the settings of the reader.The antenna is very important for the RFID reader. It can transmit signal to the tag or receive signal from the tag. Because of the small size of handheld RFID reader, the antenna in it is usually linear polarized antenna, which will affect function of the reader. So in this paper we designed and fabricated a compact circular polarized antenna for handheld RFID reader. The antenna is single fed circular polarized microstrip antenna. It excited circular polarized wave using cutting slits on the radiation patch, in the same time reduced the size. From the test result we can see the performance of the antenna promoted 21 percent, which is suitable for handheld RFID application.