考虑表面波的再入航天器机载天线数学模型

V. Mikhailov, I. V. Mazhnik
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引用次数: 0

摘要

介绍。返航高超声速飞行器的机载天线是弱定向的,这是通过波导开口端的辐射来实现的。当穿过稠密的大气层时,它们暴露在空气动力学加热中,为了保护它们,使用了耐热的无线电透明热保护。天线热保护均匀的情况可以解释为热保护厚度不加热或加热均匀。解决了被均匀介质板封闭的圆波导辐射特性的解析描述问题。由于在这种公式中必须考虑谐振域,因此需要麦克斯韦方程组的严格解。材料和方法。在已知的解析解法中,可以使用积分变换法和特征函数法。这两种方法都在工作中使用。在这种情况下,假设介质板(热保护)的电气参数和几何尺寸不依赖于时间。得到了考虑介质热保护电学参数及其厚度的具有介质热保护的圆波导方向图的关系式。得到了横向波场、表面波场和流出波场的表达式,由此可以计算出这些场的输出功率。得到了被积表达式奇点分离为面波、流出波和侧波对应的极点的关系。表面波、流出波和侧波对辐射方向有一定的影响。为了确定这一结论,得到了确定充分描述表面波、流出波和侧波的被积表达式极点的解析关系。对所得的部分比率进行了数值计算。结果表明,侧波的功率为零。从计算中还可以得出,表面波和发射波不存在辐射场,即它们对辐射图没有贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mathematical Model of the On-Board Antenna of Reentry Spacecraft Taking into Account Surface Waves
Introduction. The onboard antennas of the returned hypersonic aircraft are weakly directional, which is achieved by radiation from the open end of the waveguide. When passing through dense layers of the atmosphere, they are exposed to aerodynamic heating, for protection from which a heat-resistant radio-transparent thermal protection is used. The case of uniform thermal protection of the antenna can be interpreted as the absence of heating or heating uniform in the thickness of the thermal protection.Aim. The problem of obtaining an analytical description of the radiation characteristics of a circular waveguide closed by a flat homogeneous dielectric plate is solved. Since in such a formulation it is necessary to consider the resonant domain, a strict solution of Maxwell's equations is required.Materials and methods. Of the known analytical methods of solution, it is possible to use the method of integral transformations and the method of eigen functions. Both of these methods are used in the work. In this case, the assumption is used that the electrical parameters of the dielectric plate (thermal protection) and the geometric dimensions do not depend on time.Results. The relations describing the directional pattern of a circular waveguide with dielectric thermal protection and taking into account the electrical parameters of thermal protection and its thickness are obtained. Expressions are also obtained for the fields of lateral, surface and outflow waves, from which it is possible to calculate the power output by these fields. Relations for the separation of singular points of integrand expressions into poles corresponding to surface, outflow and lateral waves are obtained. Surface, outflow and lateral waves can have a certain effect on the radiation pattern. To determine this conclusion, analytical relations are obtained for determining the poles of integrand expressions that fully describe surface, outflow and side waves. All the analytical results obtained correspond to Numerical calculations were carried out on some of the obtained ratios.Conclusion. The results showed that the power of the side waves is zero. It also follows from the calculations carried out that there is no radiation field of surface and outgoing waves, i.e. there is no contribution of them to the radiation pattern.
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