In my previous classes we did just a bit of 2 port stuff. Where you shorted one port and then you just divided port 1's current by port 1's voltage and bam. Now we're starting to learn about n port microwave networks, and I really want to know what's going on. This post will probably be filled with questions so thanks in advance for any help. Alright, so back to basics, lets just say I have a basic (low freq) 2 port network and I'm about to find the y parameters. Let's say I'm finding in particular y11. I divide port 1's current by port 1's voltage. What exactly have I found? You know? this is what's troubling me. I'm thinking since port 2 is shorted during measurement, y11 is the admittance of the network? That's all I can think of, and I am even more clueless for y12, y21, y22. I have no idea what these quantities mean or what they say about the network. Now the other half of the puzzle...the equations: I1 = (y11*V1) + (y12*v2) I2 = (y21*V1) + (y22*v2) I don't really understand these equations. I think I might have a better handle on them if i could get my head around the meanings of y11...y22. But if anyone can put these equations into words that would probably help alot. Oh yeah, can anyone recommend a text on this kind of thing? my microwave texts assume i already know all this stuff really well, and my previous texts don't really cover the basics. i need something to cover the gap i guess.