| Transmitarray antenna is a new type of high gain antenna.It has the advantages of small size,light weight,simple feeding,and easy manufacturing.It is suitable for applications in space communications,satellite tracking,radar scanning and other scenarios.In recent years,it has attracted the attention of more and more researchers.In the research of transmitarray antennas,most of them are multilayer structures,and the structure of transmitarray is relatively complex.However,most researches only pursue the improvement of electromagnetic performance,pay little attention to structural design and ignore the performance stability problem caused by the deformation of array structure.At the same time,in the existing antenna optimization design methods,none of the existing or ongoing available knowledge is utilized.All the designs start from zero,which leads to the problems of available resource waste and low solving efficiency.In order to solve these two problems,a surrogate model transfer optimization method for antenna design is proposed in this paper,and the design problem of composite transmitarray antenna is studied using the proposed method.The specific content of this paper is organized as follows:(1)A surrogate model transfer optimization method for antenna design is proposed.This method is based on the basic process of parallel bayesian optimization.The transfer learning method is used to utilize the experience knowledge in engineering practice,which can improve the efficiency of antenna optimization design.Then it is applied to numerical test examples and antenna examples.From the optimization effect,the proposed algorithm has obvious advantages in solving efficiency and finding the optimal solution compared with existing algorithms.At the same time,a 5.8GHz microstrip patch antenna is used to discuss what similar parameter characteristics in antennas can be used to transfer.The results show that several types of different source models have good effects on the transfer optimization of antennas,which verifies the effectiveness and high efficiency of the proposed method.(2)Based on the surrogate model transfer optimization method for antenna design,the transfer optimization design method of the composite transmitarray antenna is proposed,and a Ku-band composite transmitarray antenna is designed using this method.In the design process of the transmission array,the composite structure is used to improve the performance stability of the array,and the FBG sensor is embedded at the same time.The designed array can be used as a bearing mechanical structure,and can also be used as an antenna for transmitting and receiving electromagnetic waves.It also has the function of deformation sensing.In the design process of the transmitarray element,the proposed transfer optimization method was used to improve the design efficiency of the transmitarray antenna.First,the structure model of the composite transmitarray antenna is proposed,and its working principle is introduced.Then the transfer optimization design method of the composite transmitarray antenna is proposed.The design process of a Ku-band composite transmitarray antenna is described in detail,including the transfer optimization design of the transmitarray element,the design of the composite transmission array,and the selection of the feed source.After that,it is simulated and analyzed,and the results show the effectiveness of our proposed composite transmitarray antenna design method.Finally,the performance of the conformal composite transmitarray antenna is analyzed and compared with the planar array by deforming it at different bending angles.(3)The fabrication process of the composite transmission array is introduced,the designed Ku-band composite transmitarray antenna is manufactured,and the composite array with plane,bending 30 degrees and bending 60 degrees are made respectively.Using the fabricated composite transmission array for electromagnetic performance test,the test results are basically consistent with the simulation results.The test results show that the composite transmitarray antenna,using 10 dB standard gain horn antenna as the feed source,achieves 26.28 dB gain and 3dB bandwidth of 14.4-17.4GHz.It proves the good electromagnetic performance of our designed composite transmitarray antenna.The mechanical experimental result of composite structure shows the good mechanical performance of the composite transmitarray antenna we designed.At the same time,the reconstruction of the strain field of the array also proves that the composite transmitarray antenna we designed has a deformation monitoring function. |
