Design And Optimization Of RFID Reader Antenna For Vehicle Police Equipment Monitoring System

As one of the three key technologies of the Internet of Things,RFID technology has attracted more and more attention,and has been widely used in many fields such as transportation,agriculture and logistics.It has become an important part of the new generation of information technology in the national strategy.The reader antenna plays a very important role in the RFID system.Serving as the signal transmitting and receiving equipment in the system,its performance will directly affect the system's subsequent processing of the signal.Aiming at the application scenarios of vehicle-mounted police equipment monitoring system,this paper designs a reader antenna that meets the functional requirements of the system,which has important practical significance for the application of RFID in equipment management systemVehicle police equipment monitoring system needs reader antenna with low cost,uniform coverage,small size and good circular polarization performance.In order to meet the above engineering needs,this paper designs a compact circular polarization antenna based on inverted F antenna unit.Antenna unit and feeding network are designed in detail.Parasitic antenna is loaded to further improve the gain.Then,it analyses the composition of four antennas in detail.The reader antenna array optimizes the layout of the antenna.Finally,through sample preparation and system debugging test,the results show that the reader antenna designed in this paper can meet the needs of the vehicle-mounted police equipment monitoring system,and lay the foundation for the intelligent management of police equipment.Its core work is as follows:Firstly,based on the basic theory of circularly polarized antenna,this paper designs an RFID reader antenna,which works at 915MHz and consists of four Inverted F units and a series feed network.The impedance bandwidth of circularly polarized antenna is 130 MHz(860 MHz-990 MHz),the axial ratio bandwidth is 40 MHz(892 MHz-930 MHz),and the gain is about 3.5 dBic.Secondly,in order to further improve the antenna gain,the RFID reader antenna with higher gain and good circular polarization characteristics is obtained by loading the upper parasitic patch and cutting the angle on the basis of the original antenna.Finally,the field distribution of single antenna and multi-antenna system is simulated to optimize the antenna layout to ensure uniform field coverage of vehicle-borne RFID reader.The experimental results show that the reader antenna designed in this paper has good detection results.The work of this paper provides a useful reference for the design of other related RFID application systems.