Research On Fast Electro-Mechanical Coupling Algorithm Of Flexible Antenna Based On MOM And Extrapolation Technology

Flexible antenna is a hot field of electronic equipment research,which provides more possibilities for the application of antennas in special environments.At the same time,the flexibility of antenna structure also brings dynamic deformation problem,which makes electrical performance analysis and compensation more difficult.The traditional dynamic analysis method of antenna electrical performance needs to select a large number of transient samples for numerical simulation,which is time-consuming and inefficient.However,the current fast prediction methods of antenna electrical performance equate the antenna element as a single radiation point source,ignoring the influence of antenna structural deformation on electrical performance.For high frequency passive devices,their electrical performance is very sensitive to changes in the structure size,so there will be a large error in the analysis of flexible antennas using equivalent point sources.In view of the above problems,this paper takes flexible microstrip antenna as the specific research object and carries out research on fast electro-mechanical coupling algorithm suitable for flexible antenna under dynamic deformation.The main research work is as follows:(1)A full wave analysis method for electro-mechanical coupling of flexible antenna based on MOM is proposed.Compared with traditional methods,numerical calculation is used to replace point source model at the level of element electrical properties,and field intensity vector superposition is used to replace analytic approximation at the level of array radiation field.The rectangular microstrip antenna is used as the target structure and the antenna is divided into triangular mesh.The RWG basis function discrete electric field integral equation is used to calculate the current distribution on the antenna surface,and the dipole equivalence equation is used to calculate the antenna radiation pattern quickly,and the influence of the antenna structure deformation on the surface current and radiation field is directly characterized.By optimizing the matrix calculation method with parallel technology,not only the solving ability of MOM is improved,but also the numerical results of the radiation field intensity of each array element are obtained.The accurate electrical performance analysis of the antenna array is realized,which lays the analytical foundation for the establishment of a fast electro-mechanical coupling algorithm.(2)A one-dimensional fast electro-mechanical coupling algorithm for flexible antennas based on MOM and the best uniform rational approximation technique is established.Firstly,the calculation process of one-dimensional Maehly extrapolation is derived in detail,and the effectiveness of the extrapolation method is verified by a function example.Then,taking the dynamic bending deformation as an example,the method of moments is used to calculate the current of the specific transient sample of the antenna,and the extrapolation algorithm is used to quickly calculate the current data during the dynamic deformation process,so as to complete the dynamic analysis of the electrical performance.Finally,the parallel technology is used to optimize the fast electro-mechanical coupling algorithm of antenna array to ensure the high efficiency of the algorithm when analyzing the complex electrically large electromagnetic structures.Compared with the traditional transient point-by-point analysis method,the proposed algorithm can shorten the time by 88%,improve the efficiency of the electrical performance analysis under dynamic deformation of flexible antenna,and realize accurate and fast electro-mechanical coupling analysis.(3)A multi-dimensional fast electro-mechanical coupling algorithm for flexible antennas based on MOM and multi-dimensional extrapolation theory is established.In order to enlarge the analysis range of the algorithm,the variable dimension of the fast electromechanical coupling algorithm is extended.Firstly,the 2D and 3D Maehly extrapolation formulas are deduced in detail,and the validity of the extrapolation algorithm is verified by an example.Then,MOM and the 2D extrapolation algorithm are combined to analyze the frequency sweep of bending process and the electrical properties of dynamic hyperbolic deformation.Finally,the modal superposition method is used to obtain the main mode shapes,and the modal coordinates are used as sweep parameters to quickly predict the electrical performance of the wing-mounted flexible antenna array under free vibration by combining MOM and the 3D extrapolation algorithm.Compared with the traditional method,the multi-dimensional fast electro-mechanical coupling algorithm in this paper reduces the analysis time by 70% while ensuring the calculation accuracy.The electrical performance calculation method proposed in this paper can be used as an analysis basis for the structural design and electrical performance compensation of the flexible antenna.