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本文详细地研究了用于微波带通滤波器的等离子体的介质层状结构。这种滤波器的唯一特点是它的通带的中心频率以及它的带宽可以通过改变等离子体的电子密度来调节,并且电子密度可通过调整施加在等离子介质上的电压来实现。为了便于理论分析,首先假定一个实际结构用来简明地、定性地讨论滤波原理,然后用一般的多层理论分析这个等离子介质结构。而且用称之为单纯形法的最优化技术求出中心频率。此外,文中还研究了矩形波导中有TE_(10)主模以及无界情况下的TEM模。最后给出了表示这个滤波器的特性计算结果,如:反射系数、中心频率、带宽、品质因数和损耗影响等等。
In this paper, the dielectric layered structure of plasma for microwave band-pass filter has been studied in detail. The only characteristic of this filter is that the center frequency of its passband and its bandwidth can be adjusted by changing the electron density of the plasma and the electron density can be achieved by adjusting the voltage applied to the plasma medium. In order to facilitate the theoretical analysis, we first assume that an actual structure is used to discuss the filtering principle in a concise and qualitative manner and then analyze the structure of the plasma medium using a general multi-layer theory. And using the so-called simplex method of optimization techniques to find the center frequency. In addition, the TE mode (10) in rectangular waveguide and the TEM mode in unbounded mode are also studied. Finally, the results of calculating the characteristics of the filter are given, such as reflection coefficient, center frequency, bandwidth, quality factor and loss effect.