No. Microstrip is the transmission line on one side of a double-sided PCB
and the ground plane on the other side. Stripline is with TWO PCBs with the
transmission line sandwiched on one of the boards and ground planes on BOTH
the outside layers. It makes for a much improved shielding at the expense
of much more complex mechanical assembly.

Jim



wrote in message
ll.nl...
what's the difference?
Is "open face"on a singlesided pcb and "sandwich" on a doublesided pcb?
I use a doublesided pcb with one side as a groundplane.

tnx, Wim

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

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

It's a long and twisty path...

When Hewlett-Packard split off the test and measurement, life sciences,
medical and semiconductor businesses in 2000 as Agilent Technologies,
AppCAD went to Agilent. But last year, Agilent split off the
Semiconductor Products Group, which is now a new company, Avago
Technologies. Because AppCAD supports design of circuits using the
semiconductors, it went to the new company. If you go to
http://www.avagotech.com/ and search for appcad, you will pretty much
immediately find a link to the Avago-supported version. (You can also
get there by searching for appcad on the Agilent home page, but it will
redirect you to Avago.)

Cheers,
Tom


Cheers,
Tom

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

73, Wim PE1PME