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滤波器是无线电技术中许多设计问题的中心,可以用它来分开或组合不同频率。在阻抗匹配中也经常使用滤波器。通常需要的是两端终接电阻相等的滤波器,有时也需要一个具有阻抗变换型的低通滤波器。如在参量放大器信号回路中,需一个具有阻抗变换型的低通滤波器,而现有的设计参量往往不能满足实际要求,为此需对具体问题进行计算。本文主要讨论切比雪夫阻抗变换型的原型低通滤波器及椭圆函数低通原型滤波器的一种综合方法。采用这种综合方法,可避免解高阶代数方程。其他滤波器如高通、带通等都可在低通滤波器基础上经过适当的频率变换而得到,不必另行综合。
Filters are the heart of many design issues in radio technology that can be used to separate or combine different frequencies. Filters are also frequently used in impedance matching. What is usually needed is a filter with equal termination resistance at both ends, and sometimes a low-pass filter with impedance transformation is also required. For example, in the signal amplifier of the parametric amplifier, a low-pass filter with impedance transformation is needed, and the existing design parameters often can not meet the actual requirements, so specific problems need to be calculated. This article mainly discusses Chebyshev impedance transformation prototype low-pass filter and elliptic function low-pass prototype filter an integrated method. Using this synthesis method, you can avoid solving higher-order algebraic equations. Other filters, such as high-pass, band pass, etc., are available on the basis of the low-pass filter after the appropriate frequency conversion without having to be integrated.