Hi again,

thanks for the quick answers. First of all, I have to apologize for
bad explaination. As you would guess, I am not a natural english
speaker, and so have difficulties to explain exactly what I am looking
for.

Hi there,

I am currently working on a project which leads to simulate EMC Field
coupling to printed circuits.

Without discussion of a frequency or band of frequencies, you are sure
to be either deeply disappointed or vastly rewarded in results.

What i want to simulate is a common EMC-Test. Put a PCB with the
circuitry in a shielded EMC-room (I dont know the english word) and
put a 10V/m E-Field around it in 3m distance from the sending antenna.
Frequency band is 80MHz to 1GHz


The Field couples into the circuitry
through (unwanted) loops and di/monopoles.

Certainly, this is true at all scales. Your problem is not that so
much as it is a matter of degree. As this turns on the same issue of
what frequency, it also turns on the issue of what size? Beyond that,
it becomes a problem of how near (or how far). You may note that
there is a lot of dimensionality here that is wholly lacking in your
question.

I know that, and i took in into account in my calculation. this was
not the question, its just to explain what i am doing.

I started with modeling a simple loop and a stub. I experienced no
problems for the loop, but the stub is driving me crazy:
In order to calculate the output voltage of a PCB antenna for a given
geometry and EM-Field at a desired frequency, I need to know the
output impedance for this antenna. I didn't find anything on the web
on calculating/extracting it.

This, in fact, is one of the easiest things to determine - if you know
the frequency and physical dimension.

This was the question! unfortunately
This, in fact, is one of the easiest things to determine - if you know
the frequency and physical dimension.
doesn't help me.... I know the physical dimension (PCB Layout, 93mm
length, 2mm Strip width, 0.035mm hight) The freqeuncy band is given
above.
The only thing antenna books are talking about (the ones i read) are
wire antennas, where a radius is given for calculating the
Waveresistance(? correct word ?)ZL. As i dont have a radius (stripline
is rectangular) I am not sure what to do. Is it possible to say the
area of the stripline is 0.035mm*2mm (crossection), and therefore
build up the equation 0.035mm*2mm=2*pi*r^2 and then follow for the
radius: r=sqrt((0.035mm*2mm)/(2*pi)). I think this is rather wrong,
how else can I determine the waveresistance and with it the Impedance
of the antenna?
I was thinking of a 2D FEM in order determine the unit per length
parameters L' and C' and then i can calculate the waveresistance, too.
What do you think?

thanks

Daniel