射频低通滤波器、带通滤波器、Chebyshev滤波器等射频滤波器的设计。 对新手入门非常有用，也有助于老手进一步理解射频滤波器中各种器件 参数对滤波器幅度频率特性、相位频率特性的影响。(RF filters such as RF low pass filter, bandpass filter, Chebyshev filter and so on. It is very useful for beginners, and it helps the old hands to further