ads bandstop filter

Dear sirs,
I am now studying bandstop filter design using coaxial cavity.who can give me any references or devices?thanks.

Liuyun

An example:
http://amsacta.cib.unibo.it/archive/...1/Eug_p1_5.pdf

There are several parameters to full fill for a filter design. For example fpr 1 section you can use an open stub lamda/4 length for band stop filter at the desired frequency.

Is any paper documentation for coaxial cavities?

I think that a bandstop filter with coaxial stucture must has a main coaxial transimission line,and some open-ended coaxial resonators coupled to sides the main transmission line.
but i havent done any experiment and never seen any paper describe this.