Design Of 3D Printed Circularly Polarized Dielectric Reflectarray And Dielectric Transmitarray Antenna

In recent years,with the rapid developments of communication technology,different communication systems have different requirements on the performance of high gain antennas.Both the microstrip reflectarray antenna and the microstrip transmitarray antenna can replace the large curved parabolic reflector surfaces that are difficult to fabricated.They are spatially fed with feeders,which avoids using the complex feed network.The circularly polarized dielectric reflectarray antenna and circularly polarized dielectric transmitarray antenna have the characteristics of high anti-interference,low high-frequency loss,and wide bandwidth,which has great advantages in realizing large-aperture synthesis and highfrequency applications.At home and abroad,due to related research is still in its infancy,the circularly polarized dielectric reflectarray antenna and circularly polarized dielectric transmitarray antenna have become research hotspots.In this thesis,based on the working principle of the circularly polarized reflectarray antenna and circularly polarized transmitarray antenna,a circularly polarized dielectric reflected element based on hexagonal prism dielectric resonator and a circularly polarized dielectric transmitted element based on elliptic cylinder dielectric resonator are designed by using the regulation effect of the structure of dielectric resonators on the electromagnetic wave.The circular polarization mechanism and characteristics of these two elements are analyzed in detail.Both of these elements have the advantages of high polarization transformation efficiency and wide polarization transformation frequency band.Based on the continuous phase of the two elements,the circularly polarized dielectric reflectarray antenna and circularly polarized dielectric transmitarray antenna were designed,respectively.The proposed antennas are processed by 3D printed technology,and the simulation and measured results are in good agreement.The research content in this work will be briefly generalized as follows:Firstly,in this thesis,a circularly polarized dielectric reflected element is designed using a hexagonal prism dielectric resonator structure.In terms of circular polarization characteristics,the proposed element can convert linearly polarized incident waves into circularly polarized reflected waves from 13.2 GHz to 14.9 GHz.According to phase characteristics,the continuous phase range over 360° is realized by adjusting the height of the hexagonal prism dielectric resonator,and the phase shift curves are parallel to each other.Therefore,the broadband characteristics are good.Secondly,based on the designed circularly polarized dielectric reflected element,a circularly polarized dielectric reflectarray antenna is proposed based on a continuous phase algorithm.The HFSS-MATLAB-API interface tool is used to realize rapid modeling of the proposed antenna plane.The maximum gain of the proposed antenna is 18.1 d Bi.The 3-d B axial-ratio bandwidth of the proposed antenna and 1-d B gain bandwidth of the proposed antenna are15% and 17.9%,respectively.A good agreement is between simulation and measurement.Then,based on the structure of the elliptical cylindrical dielectric resonator,a circularly polarized dielectric transmitted element is designed with a wide polarization conversion frequency band and high polarization conversion efficiency in this thesis.In terms of circular polarization characteristics,the proposed element can convert linearly polarized incident waves into circularly polarized transmitted waves from 28.2 GHz to 33.3 GHz.According to phase characteristics,the continuous phase range over 360° is realized by adjusting the height of the dielectric substrate thickness,the phase curves are linear and parallel to each other.Therefore,the broadband characteristics are good.Finally,based on the designed circularly polarized dielectric transmitted element,a circularly polarized dielectric transmitarray antenna is proposed based on a continuous phase algorithm.The HFSS-MATLAB-API interface tool is used to realize rapid modeling of the proposed antenna plane.The proposed antenna has a maximum gain of 25.1 d Bi,an aperture efficiency of 40.3%,a 1-d B gain bandwidth and a 3-d B axial-ratio bandwidth of 13.3% and 17%,respectively.A good agreement is between simulation and measurement.