Wideband directional couplers in network analyzers

Hello,

i am looking for wideband directional couplers (MHz...26.5 GHz), but I cant find an appropriate one.

I am wondering how it is realized within network analyzers ? Do they use many of them ?

Thanks.

elektr0

The ones I have seen, like the Krytar ones. Are a stripline media with broadside coupled lines, and about a million quarter wave sections.