Analysis Of Scanning Characteristics Of Two Dimensional Radome

A radome,an acronym coined from radar dome,is a cover or structure placed over an antenna that protects the antenna from its physical environment.With the development of wireless technology,the antenna is widely used in many fields,ranging from the mystery of the universe to the deep ocean.The radome-closed antenna systerms are used in a variety of complex environment.In addition,radome plays an important role in many fields,such as electronic countermeasures,stealth technology and so on.The antenna is protected by an antenna radome,and its radiation characteristics are inevitably affected by the radome.After the antenna loading radome,its maximum radiation direction,side lobe level and gain will change significantly.After the antenna with cover’s performance is a very meaningful work.Simulation covered by calculation performance of antenna system can improve the efficiency of the radome design,shorten the cycle of radome design and save the cost of the design.In this thesis,the antenna arrays loaded radome in the two-dimensional space has been analyzed numerically by using the method of moments(Mo M).The main work includes the following two aspects:1.The pulse basis functions and point matching method of moments(PP-Mo M)and pyramid function,multipoint matching method of moments(PM-Mo M)were studied in this thesis.The electromagnetic scattering characteristics of two-dimensional dielectric cylindrical shells were calculated by using two methods for normally incident TM wave and TE wave.The electric field integral equation(EFIE)was used to treat two-dimensional dielectric cylindrical shells scatters for the TM polarization and TE polarization.Those techniques yield results which agree accurately with the exact classical solution.There have been some errors that the results obtained by employed the EFIE within a numerical formulation for TE wave scattering from dielectric cylindrical shells compared with those calculated by the analytic method.The accuracy of the approach was affected by the dielectric constant of scatters.The reasons for the results deterioration have been discussed and better accuracy for the TE case might be obtained by employing some methods.The magnetic field integral equation(MFIE)can be used to treat the TE problem.The results obtained by the PM-Mo M agree well with those obtained by t the exact classical solution. Its results was better accuracy of the approach compared with those calculated by using the PP-Mo M.2.After verification of the two methods,the electrical performance parameters of the uniform linear antenna array loaded with radome in two-dimensional space were simulated by the PM-Mo M.The infinite length of current wire was selected as the element of the antenna array.A semicircle radome was arranged over the antenna array,and the center of the radome was located in the center of the antenna array.In this thesis,the changes of the array gain,the sidelobe level and other electrical performance parameters have been calculated and analyzed,and the radiation characteristics of the array antenna are also analyzed when the dielectric constant of the radome was changing.In addition,the change of the electrical performance parameters of the antenna array was analyzed when the antenna array was scanning.