Research On A Microstrip Antenna Of RFID Read-write Device Based In Internet Of Vehicles

In information society, the cutting-edge technology of wireless communicationtechnology has been everywhere, and rapidly changed our daily life in Internetcommunication. As entry signal converter of wireless communication technologyin Internet of Things, the design idea and the performance quality of the antenna directlyimpact on the communication signal processing. Therefore, more studying and designingon the antenna have very important significance.Radio frequency identification technology (RFID) has been considered one ofresearching hotspots in the field of global wireless communications It has the followingadvantages: high transmission precision, faster reading and writing speed, goodconfidentiality, strong environment adaptability and without human intervention, and so on.Through wireless communication, RFID has implemented quick delivery for reading orwriting information and automatically identified short message. Nowadays, in terms ofhigh-efficiency (HF) and ultra high-efficiency (UHF), RFID technology can completecommunication in several meters or more than ten meters, and then make it more and moremature for research and development in the Internet of things applications, especially in carnetworking applications. Therefore, as a device for receiving and transmitting information,the effect of the antenna is also very important in radio frequency identification technology.With the wide use of vehicle network and higher requirements of RFID for miniaturizedantenna, microstrip antenna has a wide range of applications, so the research for itscompact structure, small volume, low profile and easy integration has attractedmuch attentionIn this paper, on the base of the analysis on microstrip circuit design principle, wefocus on ultra-high frequency of2.45GHz frequency band rectifying antenna by applied incar networking. The circuit principle of each component on receiving part for a low-pass filter and microwave rectifier circuit in a rectifying antenna is discussed. And then we havedeep analysis and research for its structure and application. In addition, through theintroduction of the design method and the working principle for the microwave photoniccrystal structure of the antenna, we designed a photonic crystal structure improvedmicrostrip antenna, making it as far as possible to the miniaturization. The defect structureis used to design to complete the microstrip antenna low-pass characteristics and2.45GHzlow-pass filter features. The assisted microwave photonic crystal structure antenna designexperiment was carried out by using HFSS software to determine the parameters andperform simulation and optimization.Through experimental tests, the design index of theantenna can reach4.25dBi gain. When the input power is16dBm and load impedance is250ohms, the rectifier efficiency can reach above sixty percent. Prove that this antenna hasgood communication performance. On the premise of ensuring the antenna gain, bydecreasing the size of the antenna to satisfy the expectations on improved antenna gain andsmaller size for the car networking RFID terminal, it an push the practical microstripantenna car networking application process and ensure the rationality and practicality of theoverall design of the rectifying antenna. At the same time, the design of microstrip antennais also extensible application for wireless communication system, in addition to the carradio frequency identification system, it can also be applied to the low power wirelesssensor network system and other low power electrical equipment.