The Design And Optimization Of Wideband Miniaturized Antenna In Radome

As the front part of the electronic system,the antenna plays a crucial role in the entire system.In order to adapt to the rapid development of modern society,it is the development trend of wireless system to study how to make the antenna reach a more stable electrical performance index in a wider frequency range.At the same time,with the continuous development of large-scale integrated circuits,the miniaturized design of the antenna obviously has very important practical significance.In addition,the stability and reliability of the antenna are also very important performance indicators.The loading of the radome can protect the antenna from environment interference,but it will also affect the performance of the antenna.Therefore,it is very important to study how to reduce the effect of radome on antenna.The specific research contents of this paper are as follows:(1)Design and optimization of a broadband miniaturized dielectric resonators.According to the radiation principle of the resonant cavity,a laminated dielectric resonator antenna is used as the research object.A single-layer broadband dielectric resonator antenna is realized by using a special structure.The antenna is broadened by using a stacked structure and an air hole,and miniaturized by using dielectric walls with high dielectric constants.The final operating range of the antenna is 4GHz to 12 GHz.The antenna elements of the design are arrayed and placed in a radome for simulation,and optimized by changing the structure of the antenna array.It is found that the angle change has a greater impact on the performance of the antenna.(2)Design and optimization of a broadband miniaturized Vivaldi antenna.According to the design principle of non-frequency-variable antennas,this paper adopts the opposite-structured antipodal Vivaldi antenna as the research object.A microstrip line-fed Vivaldi antenna was designed by means of loading techniques,optimization of antenna shape structure and special dielectric substrate.The final operating range of the antenna is 2GHz to 18 GHz.The antenna elements of the design are arrayed and placed in a radome for simulation,and optimized by changing the structure of the antenna array.The antenna is processed and the test results are in accordance with the simulation.(3)Design and application of metamaterial absorber.Due to the influence of the radome on the performance of the antenna,the absorbing material is used in the radome to optimize the antenna's pattern performance.First,according to the principle of absorbing,a multi-layer structure is used to design a broadband metamaterial absorber,which has a wave absorption rate of 90% in the frequency range of 7GHz to 18 GHz.Secondly,add ordinary ECC absorbing materials to the radome for simulation analysis.It was found that the performance of the antenna was optimized at low frequencies,but the performance beyond the 9 GHz range was poor.Finally,the design of the metamaterial absorber is applied in the high frequency range.Simulations have found that the performance of the antenna is optimized.