[SI-LIST] Re: port terminations

Vijay,

If you calculate the capacitance per unit length C with all dielectrics
present.
And calculate the capacitance per unit length Co with all dielectrics set to
air.
c is speed of light in vacuum.

Then   Z = 1 / (c x sqrt(C x Co))

It does not matter what you call it.

There are some shareware FEM programs on the WEB that will let you
look at arbitrary geometries.

www.quickfield.com

www.pdesolutions.com

Both of these limit the number of nodes. Use symmetry to get more
nodes applied to your problem. The full version of FlexPDE is less than
$500.

Dan

Dan Swanson                     EMAIL:   d.swanson@xxxxxxxx
Bartley RF Systems, Inc.        TEL:   978-834-4085     
37 South Hunt Road              FAX:   978-388-7077
Amesbury, MA  01913



On Thursday, September 20, 2001 8:21 PM, Vijay Varadarajan
[SMTP:Vijay.Varadarajan@xxxxxxx] wrote:
> Hi All!
> Consider a EM structure with 4 layers of dielectric. 
> layer 1 air
> layer 2 dielectric
> layer 3 dielectric
> layer 4 dielectric
> top and botton are grounded. if i draw a rectangular conductor in layer
3(say) how do i calculate the characteristic impedane for the port
termination. do i consider it as a stripling or a microstrip. 
> i will be gald if anyone could anwer my question.
>  - vijay
> 
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> 
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
> 
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> 
> List archives are viewable at:     
>               http://www.freelists.org/archives/si-list
> or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages 
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>   
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: