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一、引言宽频带,高方向性波导定向耦合器,其耦合机构,一般都是采用多孔耦合阵,而多孔耦合阵,又分为均匀直线阵,二项式阵以及切比雪夫阵。其中以切比雪夫阵为最佳,所谓切比雪夫阵,就是阵中每个小孔的电压耦合系数与切比雪夫多项式的系数成比例。这种耦合阵的特点是方向性曲线在一定值附近等幅摆动,而摆动的波纹数与阵中的元数成比例,孔数越多,摆动的波纹数也越多。第二个特点是方向性的频带较宽,即使在频带边缘方向性特性曲线也不产生恶化。
I. INTRODUCTION Broadband, high-directivity directional waveguide couplers and their coupling mechanisms generally employ a porous coupling array, which is divided into a uniform linear array, a binomial array and a Chebyshev array. Among them, the Chebyshev array is the best. The so-called Chebyshev array is the ratio of the voltage coupling coefficient of each hole in the array to the coefficient of the Chebyshev polynomial. The characteristic of this coupled array is that the directivity curve oscillates in equal amplitude around a certain value, while the number of wobbles in the wobble is proportional to the number of elements in the array. The more the number of holes, the more waviness the wobble will be. The second feature is that the directional frequency band is wide, which does not deteriorate even at the edge of the frequency band.