讨论了滤波器设计中的一些理论，尤其是研究了在滤波器阻带内实现传输零点的一些理论和设计方法。
In the second, filter design theory and methodology has been investigated, especially the cross-coupled resonator filter and the modified chebyshev filter.
所设计滤波器的选择性和阻带衰减可预先给定并易于控制。
The filter selectivity and stopband attenuation can be easily specified or controlled.
试验结果表明，增加了线性相位这一重要性质的同时，分析和综合原型滤波器在阻带衰减、通带平坦性以及系统混叠等性能方面仅有很小的损失。
And the examples verified that the analysis and synthesis prototype filters with the linear phase constrains show a little loss in perfanmence compare with those without this property.
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