On Study Of A Novel Organic Magnetic Radome

Radome, which is a kind of dielectric shell, is used to protect antenna and avoid its.damage from the possibly worst conditions. Though radome has the advantage of protecting antenna, it must deteriorate the radiate performance of antenna and debase the efficient power of electric system with radome. So far the material of radome limits only in the use of dielectric material. Many problems caused by radome are the result of asymmetric electric parameters of dielectric material, which means it has no magnetic character but electric one. Fortunately there is a kind of new organic magnetic material discussed in the paper, which can make up the disadvantage of dielectric material.In the thesis, the transmission performance of organic magnetic material radome is discussed, and the analysis of relation between the electric performance of radome and the electric parameters of organic magnetic material aims at optimizing the later. As the foundation of analysis of electric performance of organic magnetic material radome, the reflection performance of plane waves being incident on a plane boundary between organic magnetic medium and air is firstly investigated with the help of ray tracing method. And then the concept of multiple reflections is introduced to discuss the transmission performance of flat organic magnetic material radome so as to clarify the mechanism of plane wave propagation through magnetic dielectric sheet. For a homogeneous and isotropic magnetic sheet, the relation between electric and magnetic field on the sides of it has the same form with the'transfer matrix equation of transmission 1 ine. As a result, a homogeneous dielectric sheet can be looked upon as a uniform transmission line. Therefore, the transmission performance of multilayer plane organic magnetic material radome can be analyzed by use of four-port network theorem, that is, on the basis of network theorem, the transfer matrix of multi layer plane radome is the resultof cascade connection of transfer matrixes of each layer. As far as curved radome is concerned, paraxial approximation analysis of complex ray method is employed in the paper, and the electric performance of single-layer cylindrical organic magnetic material radome is discussed mainly. Numerical results showed that the radome had the most optimized transmission performance if the relative permittivity of organic magnetic material equals to the relative permeability.Therefore, this research will play a pioneer role in the field of radome and provide the foundation for theoretical study of the organic magnetic material radome.