求助，10-4-4滤波器

05-08

在文献中，看到10-4-4滤波器，10表示滤波器的阶数，4 是表示传输零点的个数吗?还有一个4是什么?
下图为一个例子
Rotate a 10-4-4 filter to illustrate the changing of
iris coupling into screw coupling
Normalized input/Output termination : 1.0814
1 2 3 4 5 6 7 8 9 10
1 .0000 .8573 .0000 .0000 .0000 .0000 .0000 .0000 .0000 .0119
2 .8573 .0000 .5953 .0000 .0000 .0000 .0000 .0000 -.0164 .0000
3 .0000 .5953 .0000 .5415 .0000 .0000 .0000 -.0782 .0000 .0000
4 .0000 .0000 .5415 .0000 .5282 .0000 .0265 .0000 .0000 .0000
5 .0000 .0000 .0000 .5282 .0000 .5815 .0000 .0000 .0000 .0000
6 .0000 .0000 .0000 .0000 .5815 .0000 .5282 .0000 .0000 .0000
7 .0000 .0000 .0000 .0265 .0000 .5282 .0000 .5415 .0000 .0000
8 .0000 .0000 -.0782 .0000 .0000 .0000 .5415 .000 0 .5953 .0000
9 .0000 -.0164 .0000 .0000 .0000 .0000 .0000 .5953 .0000 .8573
10 .0119 .0000 .0000 .0000 .0000 .0000 .0000 .0000 .8573 .0000

the first "4" means the number of the transmission Zeros, which is the pure Imaginary solution of the filter transfer function.
the second "4" means the number of the equlization Zeros, which is the pure real solution of the filter transfer function. This helps the in-bband performance (band-edge specifically) by sacrifising the centre frequency performance.
Based on the coupling matirx you showed, this must be a folded structure, 5 resonators in a row, and 2 rows in parallel.

多谢啊！好厉害啊，有一点我还不太明白：你说的the second "4" means the number of the equlization Zeros, which is the pure real solution of the filter transfer function，是指用于均衡的四个传输零点是实数吗?the first "4" means the number of the transmission Zeros, which is the pure Imaginary solution of the filter transfer function，而另外四个传输零点是虚数吗?

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