Mail Archives: geda-user/2011/10/27/04:21:16
Hi Gus,
On Thu, Oct 27, 2011 at 01:03:04AM -0400, Gus Fantanas wrote:
> Speaking of microwave design, I wonder, if one wants to do stripline
> design and has to use open-shunt stubs, can the ends of the traces be
> straight instead of oval?
Use a solid polygon, it works in all cases that I have met.
> If not, could one workaround be, perhaps,
> creating patch (one-pin footprint) to terminate an open shunt?
Why not? After all the stub behaves as a component, and has to be
entered as such for simulation netlist. The main difference being
that it comes for free, assembly included, with the PCB (prune
it from the BOM).
> The
> width of such pseudo-component would be the same as the width of the
> trace it "terminates" and the total length of the two would be the
> calculated length of the shunt.
To my knowledge, the only commonlyly used structure that is difficult
to draw with PCB is the radial stub.
>
> I am not sure how this trick would work for microstrip, though, as the
> terminating "pseudo-component" would be positioned between planes. This
> case is probably very rare.
I suspect you mean stripline. No it would not work, since PCB insists
that components have to be on the top or bottom layers. But in this
case the solid polygon solution still works.
>
> I use the version of PCB that came packaged with Ubuntu 11.10.
>
>
> Regards,
>
> Gus Fantanas
>
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