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本文采用伽略金法分析了宽边重合的矩形波导,通过公共壁上两个纵向窄缝隙耦合而形成的定向耦合器特性。基函数系和检验函数系分别取为三角函数。根据等效原理和边界连续条件,分别在两个缝隙上、下口径上建立四个耦合的积分方程,待求口径上的切向电场。通过矩量法把积分方程变成矩阵方程,对矩阵中的元素(或内积)进行处理之后,利用计算机进行数值求解,求出口径切向场、散射场、耦合系数、方向性系数、隔离度和电压驻波比等参数.给出了标准X波段矩形波导(BJ—100或WG16)定向耦合器参数随频率的变化关系。
In this paper, we analyze the characteristics of directional couplers formed by wide rectangular overlapped rectangular waveguide by the method of Galerkin method and coupled by two longitudinal narrow slots on the common wall. The basis functions and the test functions are taken as trigonometric functions respectively. According to the equivalent principle and the continuous boundary conditions, four coupled integral equations are established respectively on the upper and lower caliber of the two slits, and the tangential electric field on the caliber is demanded. After the integral equation is transformed into the matrix equation by the method of moment, the elements (or inner product) in the matrix are processed, then the numerical solution is done by computer, and the tangential field, scattering field, coupling coefficient, directivity coefficient, isolation Degrees and voltage standing wave ratio and other parameters.And the parameters of the directional coupler of the standard X-band rectangular waveguide (BJ-100 or WG16) are given as a function of frequency.