combline filter tuning (microwave studio)

Hi everyone

I need help about tuning technique represented on www CST :

http://www.cst.com/Content/Documents...rtenfelder.pdf

but I dont exatly understand this technique.
Could anyone send me step by step process description
or any example file.

what kind of tuning do you use, for design.
e.g.
you have egsm filter
BW=80 MHz
fo=920 MHz
Q=2000
1100@40dB

please let me know, many thanks

BR
V.