Research On Conformal Quasi-endfire Antenna Technology On Metal Surface

As an indispensable part of tactical communication of high-speed aircraft,the modernization of military equipment puts forward more stringent performance requirements.In order to adapt to the increasing development of modern equipment,this thesis focuses on the design background of metal surface conformal installation,aiming at the research of quasi-endfire antenna technology with diversified electrical properties,depth research on the technical requirements of broadband,high power,dual circular polarization and embedded is carried out.The main work and research results are as follows:1.The radiation principle of the endfire antenna is analyzed,and the research methods for the analysis and design of the endfire antenna are pointed out.The unit principles of several special endfire antenna elements suitable for the conformal metal surface are explained.The qualitative analysis of the radiation characteristics of the unit antenna applied on the embedded metal platform is given by using the geometric diffraction theory,which lays the foundation for the subsequent design of the relevant antenna.2.A broadband conformal quasi-endfire antenna is studied.On the basis of full investigation,the principle analysis and simulation study of the half-width microstrip antenna are carried out,and the realization principle of the wide beam characteristics of the half-width microstrip antenna is explained.Then the half-width microstrip is used as the active dipole of the endfire Yagi antenna to study the endfire radiation characteristics of the conformal antenna.In addition,the coaxial capacitive probe structure is introduced in this thesis,and the broadband matching design of the conformal antenna is carried out,so that the type of Yagi antenna is expanded from 13.1 % to 20.1 %.Finally,considering the application background,the conformal simulation verification of the designed antenna is carried out,which provides theoretical support for the engineering of this antenna.3.A conformal dual circularly polarized quasi-endfire antenna embedded in a metal platform is studied.In order to satisfy the electrical performance of broadband,dual circular polarization,quasi-end radiation,and satisfy the structural performance of high temperature resistance,high power,embedded metal platform installation characteristics,the four-ridge waveguide radiator is used as the design prototype,and the integrated dual circular polarization technology is studied.The theoretical analysis and simulation verification of different circular polarization methods are carried out.The quasi-endfire radiation realization method of oblique incision surface and medium oriented structure is proposed.Finally,an embedded dual circular polarization quasi-endfire radiation antenna is designed,and the prototype is processed and tested.The effectiveness and feasibility of the proposed method are verified by the test results,which indicates that the antenna can be applied in the demand of high-speed aerial end-shot antenna.4.A conformal dual-circularly polarized quasi-endfire antenna for X-band is studied.It is pointed out that the introduction of fine and complex structures should be avoided in the antenna design of X-band and higher frequency.Under the guidance of this idea,the clapboard circular polarizer is used to design the X-band antenna.As well as the theoretical research and simulation verification of the relevant performance of the clapboard circular polarizer are carried out.Finally,an X-band embedded metal platform conformal dual circular polarization quasi-endfire antenna is designed and tested in physical processing.The effectiveness of the proposed method and the feasibility is proved by the test results,which can be applied to the antenna design of X-band and even millimeter wave band.