Electromechanical Coupling Modeling And Mechanism Analysis Of Electrical Performance Influence Of Microstrip Reconfigurable Antenna

With the increasing demand for communication in modern society,wireless communication technology has developed rapidly.The traditional single antenna can no longer meet the further needs of the system.Based on this,reconfigurable antenna technology is proposed accordingly,which has become a research hotspot in the field of antenna.The reconfigurable antenna can be divided into two categories:single-parameter reconfigurable and multi-parameter reconfigurable.Composite reconfigurable antennas can work in the multi-parameter adjustable state under the same antenna aperture,which has great research value in the study of reconfigurable antennas.Reconfigurable antenna is a functional system integrating electromagnetic,mechanical,thermal and other disciplines.Its structural and electromagnetic characteristics are mutually affected and constrained.Most of the research on reconfigurable antennas is based on the combination of experience and software simulation now.There is no systematic research theory,which not only makes the design of high-performance reconfigurable antenna structures difficult,but also makes it hard to describe the electromagnetic characteristics qualitatively.It will seriously restrict the further development of the reconfigurable antenna.Establishing the electromechanical coupling model can clarify the relationship between the structural parameters and the electrical performance of the reconfigurable antenna,and analyze the impact of the complex environment on the electrical performance of the antenna to provide technical support for the performance evaluation of the reconfigurable antenna.It is necessary to study the electromechanical coupling theory of reconfigurable antenna.Aiming at the study of the electromechanical coupling theory of the microstrip reconfigurable antenna,the research work in this thesis is as follows:1.This thesis presents a frequency and pattern composite reconfigurable antenna.The reconfigurable antenna has a variety of switch combination states.Four of them are mainly selected for in-depth study in this paper.The antenna resonance frequency can be reconfigured at 8.66GHz(X-band)and 15.26GHz(Ku-band).The main beam can be reconstructed at+36°and-36°in the radiation direction,and the S11 parameter is less than-10d B,and the gain is greater than 5d B.The electrical performance changes of the reconfigurable antenna under different switch combination states and different parameter changes were simulated and analyzed,and some rules are obtained.2.Aiming at the composite reconfigurable antenna with frequency and pattern,combined with the analysis theory of microstrip antenna such as transmission line model,cavity model and so on,the electromechanical coupling model of the reconfigurable antenna is established,including antenna structure resonance frequency coupling model and antenna structure pattern function coupling model.The numerical verification is carried out.The structural parameters of the resonant frequency coupling model change within 1mm,the relative error between the model and simulation is less than 5%,the W₀ parameters of the pattern coupling model change within 0.4mm,the L₀ parameters change within 0.1mm,and the relative error is less than 5%.It is considered that the electromechanical coupling model established is applicable in a certain range.This model provides a theoretical basis for the subsequent analysis of the influence mechanism of the reconfigurable antenna's electrical performance.It can quickly analyze the changes in the antenna's electrical performance under the influence of different environmental loads,evaluate the performance of the reconfigurable antenna,and further guide the structure of the reconfigurable antenna.3.Considering the frequency bands,the service environments of the reconfigurable antenna are analyzed.The reconfigurable antenna array is analyzed and simulated by ANSYS in the typical environment of the spaceborne.Then the deformation information of one element is extracted and analyzed.Based on the electromechanical coupling model of the reconfigurable antenna,the change of the electrical performance under different temperature is calculated.Under the influence of extreme high/low temperature of the space-borne environment of the reconfigurable antenna,the frequency will shift to a certain extent,with a maximum offset of 0.12GHz.When the antenna is in a reconfigurable pattern,the environment will make the reconfigurable antenna beam pointing offset and decrease the gain.The pointing offset and gain loss are slightly larger in high temperature environments,where the maximum gain loss is 0.15d B when the antenna is in mode four.