book about Network Analysis machine

HI everybody
I'm studying Network Analysis machine,and I'm looking for book about it.
I hope everybody can help me book talking about Network Analysis ?
thanks.

Dear vcoltech
I studied about you topic some times ago and I think the best reference for your need is agilent website.there are lots of application notes there that really can help you.I know some private company that receives Idea from agilent website and made some VNA for some specific frequencyes.
for example see this link:
http://www.home.agilent.com/agilent/...ect=SR.GENERAL