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在数字及高速率信号传输系统中,经常采用Bessel或Gaussian函数滤波器,该类滤波器只有在中心频率(带通滤波器)或DC处(低通滤波器)才有良好的匹配特性,在其他频点都有很大的反射,在微波电路的级联中会产生杂波和干扰。为了解决该问题,设计了一种在通带和阻带内都有很小反射的滤波器,即吸收型(匹配型)准高斯类带通滤波器。介绍了其设计过程及方法,并设计了一种中心频率为100 MHz的吸收型准高斯带通滤波器,给出了仿真结果和实测曲线,实测结果与仿真结果吻合得很好。
In digital and high-speed signal transmission systems, Bessel or Gaussian function filters are often used. Such filters have good matching characteristics only at the center frequency (band-pass filter) or DC (low-pass filter) Other frequencies have a great reflection, the clutter in the microwave circuit will produce clutter and interference. In order to solve this problem, a filter with a small reflection in the passband and the stopband is designed, that is, an absorption type (matching type) quasi-Gaussian bandpass filter. The design process and method are introduced. An absorption quasi-Gaussian bandpass filter with a center frequency of 100 MHz is designed. The simulation results and measured curves are given. The measured results are in good agreement with the simulation results.