wrote:
what's the difference?

You should do some homework,
http://www.ansys.com/industries/mems..._micostrip.pdf

or in a shorter format

http://tinyurl.com/dxtvu

Cheers,
Galen, W8LNA

Thank you all for your input and help!
Now i can live on

73, Wim PE1PME

forgive him, not me would you care to hang a mosquito on a piece of
strip line. It's quite clear he's referring to a microstrip circuit.
which one of us is using strip lines, except in power amplifiers.

You wanna try that again in English?

Jim


"Saandy , 4Z5KS" wrote in message
oups.com...
forgive him, not me would you care to hang a mosquito on a piece of
strip line. It's quite clear he's referring to a microstrip circuit.
which one of us is using strip lines, except in power amplifiers.

Oh, well, those of us who deal with multilayer boards regularly use
stripline: lines sandwiched between ground planes on inner layers. But
from the sounds of it, Wim almost certainly is using microstrip.
However, if you look more carefully at it, you'll discover that your 75
ohm line is NOT 75 ohms "from DC to daylight" -- things fall apart at
low frequencies (significantly so below 1MHz or so), and where the
dimensions of the line are comparable to a wavelength (well below
"daylight"). But again, Wim should be fine using the dimensions you
originally gave him for what he wants to do.

Cheers,
Tom