Design Of Miniaturized LoRa Microstrip Antenna

With the rapid development of wireless communication technologies and the arrival of the age of 5G communication,people's demand for wireless equipment has gradually increased.Therefore,various portable communication devices have begun to upgrade and develop towards miniaturization,and the antenna as the main device that can communicate,affects the performance of communication in many aspects,which is an essential part.In this context,microstrip antennas have small size,easy to integrate,and simple to manufacture are more helpful to achieve miniaturization.Under the limited installation space,the reduction of the antenna size will reduce the gain and the radiation direction performance.Therefore,how to balance the gain and radiation direction of the antenna on the basis of realizing the miniaturization of the microstrip antenna is a problem to be solved at present.For this reason,this paper designs a microstrip antenna suitable for LoRa communication system,aiming at the problems of small gain and poor radiation performance of miniaturized microstrip antenna.The parameters of the antenna are simulated and optimized by 3D electromagnetic simulation software.The main research contents are as follows:Firstly,the basic theory of microstrip antenna is studied in depth,and the content mainly covers the basic structure,main performance parameters and radiation principle of microstrip antennas.The functional requirements,application environment and technical route of antenna miniaturization of Lora microstrip antenna in shock wave test and storage system are systematically analyzed.Then,a small LoRa microstrip antenna suitable for the shock wave test setup is designed.The working frequency of the antenna is 470 MHz,and it is improved on the basis of the inverted-L antenna.In order to reduce the size of the antenna more effectively,this paper adopts the meandering technology and the active matching network technology,mainly in the form of a meandering structure.The current path on the surface of the antenna is bent,so that the effective length of the antenna is increased,the area occupied by the antenna under the same theoretical length is reduced,and the matching network is loaded to make the antenna have good frequency characteristics.The antenna model is built by HFSS three-dimensional electromagnetic simulation software,the influence of each parameter on the antenna performance is analyzed,and it is optimized.The simulation results show that the gain of the antenna can reach 2.96 d Bi,the size is 1.7 cm×2.5 cm,the resonant frequency is good,and it is omnidirectional.Finally,an FPC antenna with a working frequency of 470 MHz is studied and simulated.The antenna is miniaturized by using a specific flexible material as a dielectric substrate.The working principle of the antenna is analyzed and the feasibility of the antenna designed in this paper is verified.