At 04:11 PM 11/07/01 +1000, you wrote:
>This is fine for free space, but if you're trying to calculate the
>wavelength in something like coax you have to take into account the change
>in velocity:
>
>
>Wave Lenght (in meters) = (VF.c)/f
>
>Where VF = velocity factor (about 0.6 for RG59)

VF is 1/Sqrt(Er) - so for microstrip lines you can determine VF from 
Er(eff) - effective *relative* dielectric constant.  This is assuming that 
the magnetic characteristics of the material are essentially the same as 
free space (mu-zero) if not then the VF becomes 1/(sqrt(Ur*Er))

where Ur is the effective relative mu (permeability), and Er (epsilon) is 
the effective relative dielectric constant (relative permittivity)

>         c = speed of light in vacuum in m/s

which is precisely (as in no error) 299 792 458 m/s.


>         f = frequency in Hz


There ... the pedant in me is sated for a few months...
Ian Wilson

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* To post a message: mailto:[EMAIL PROTECTED]
*
* To leave this list visit:
* http://www.techservinc.com/protelusers/leave.html
*                      - or email -
* mailto:[EMAIL PROTECTED]?body=leave%20proteledaforum
*
* Contact the list manager:
* mailto:[EMAIL PROTECTED]
*
* Browse or Search previous postings:
* http://www.mail-archive.com/proteledaforum@techservinc.com
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Reply via email to