不同表面阻抗波导中耦合系数的关系及其在远程波导精确度计算中的应用

本文从阻抗微扰的概念出发,把Unger在研究H₀₁波通过弯曲及截面变形波导管时所得到的耦合系数,在不同表面阻抗时平方和不变的原理推广到更普遍的情况,这样,使计算相关距离十分小的各种随机公差和接头公差变得十分简便,对于不同类型波导精确度的计算,可由统一的公式出发,此外在一般情况下,得到了两两耦合系数之间的相互关系。在计算均匀不规则波导的精确度时,利用阻抗微扰的形式,得到尤许阻抗微扰量与附加衰减的关系,从而可以按照各种不规则性与阻抗微扰的关系决定均匀公差。

RELATIONS BETWEEN COUPLING COEFFICIENTS OF WAVEGUIDES WITH DIFFERENT SURFACE IMPEDANCES AND ITS APPLICATION

In this paper, on the basis of the concept of the impedance purtubation, the principle of invariance of the square of the coupling cofficients proved by Unger is generalized. With this generalization, it becomes simpler to compute the random tolerances with small correlation distance and the discrete tolerances. Unified formulas are derived for computation of various tolerances of waveguides. In addition, relations between relevant pairs of coupling coefficients are obtained.The added attenuation due to an arbitrary form of uniform irregularity is expressed in terms of the maximum allowed impedance perturbation.Numerical examples are given.