Re: NEC-List: Wire Radi to printed conductor?

Gentlemen,

Thank you, I occasionally read the threads with some
interest.

I don't with to do it for you, but the answer is in
rho, the bulk resistivity property with respect to
cross-sectional area and length.

I too am taken aback at the arbitrary approach to such
conversions and I don't believe it's correct. I don't
see pi anywhere.

This is interesting along those lines (no pun
intended)- see the PCB trace impedance calculator
link:

http://www.polarinstruments.com/menu/home.html

Al Thomas
pcss_at_earthlink.net

--- Chuck Counselman <ccc_at_space.mit.edu> wrote:
> At 10:50 AM -0400 5/9/02, Wayne Shanks wrote:
> >Now that I look at this formula, I seems some what
> funny.
> >
> >Do I interpret this correctly when I say that a 1mm
> wide strip can be
> >approximated by a wire of diameter 8mm...[?]
> >----- Original Message -----
> >From: "Chuck Counselman" <ccc_at_space.mit.edu>
> >To: "Wayne Shanks" <wshanks_at_matricsrfid.com>
> >Cc: <nec-list_at_gweep.ca>
> >Sent: Thursday, May 09, 2002 9:22 AM
> >Subject: Re: NEC-List: Wire Radi to printed
> conductor?
> >
> > > At 9:15 AM -0400 5/9/02, Wayne Shanks wrote:
> > >>Has anybody looked into the relation between a
> NEC wire of radius r and a
> > >>printed conductor (copper trace or other such
> thing) of width 2r.
> > >
> >> The answer is that a wire of radius r is
> equivalent to a thin flat
> > > strip of width w if r = w/4.
>
>
>
> No. If the strip width, w, is equal to 1 mm, then
> the wire radius, r
> = w/4, is equal to 0.25 mm.
>
> The wire diameter, equal to 2r, would be 0.5 mm --
> not 8 mm.
>
> -Chuck.
> --
> The NEC-List mailing list <nec-list_at_gweep.ca>
> http://www.gweep.ca/mailman/listinfo.cgi/nec-list
>
>

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