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CN101252669B 具有增强的高通频带响应的双带阻滤波器 失效 - 权利终止

具有增强的高通频带响应的双带阻滤波器
摘要：
一种双带阻滤波器，影响低通频带、被中通频带隔开的第一和第二阻带和高通频带的频率。所述滤波器包括两条支路。一种形式中，一条支路为高通滤波器而另一支路为带阻滤波器，其输出进入低通滤波器。在第二种形式中，一条支路为低通滤波器，而另一支路为高通滤波器，其输出进入带阻滤波器。当低通频带的上限值约为100MHz或更低时优选第一种形式，而当低通频带的上限值约为100MHz或更高时优选第二种形式。在第三种形式中，一条支路为高通滤波器而另一条支路为一夹在两个低通滤波器之间的带阻滤波器，阻止来自低通滤波器的二次谐振干扰高通频带的所需频率。
摘要（英）：

A dual bandstop filter affects frequencies in a lower passband, first and second stopbands separated by a middle passband, and an upper passband. The filter includes two legs. In one version, one leg is a highpass filter while the other leg is a bandstop filter outputting into a lowpass filter. In a second version, one leg is a lowpass filter while the other leg is highpass filter outputting intoa bandstop filter. The first version is preferred when the upper value of the lower passband is around 100 MHz or less, while the second version is preferred when the upper value of the lower passband is around 100 MHz or more. In a third version, one leg is a highpass filter while the other leg is a bandstop filter sandwiched between two lowpass filters, preventing second resonances from the lowpass filter from interfering with desired frequencies in the upper passband.

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