I use several different simulators for RF/microwave/microstrip . Eagleware
Genesis has good behavioral models for circuit elements and also an
electromagnetic simulator in the latest versions. If you want a freebie ,
try Sonnet Lite from www.sonnetusa.com . It is a finite element analysis
package for electromagnetic simulation , completely free (their other tools
are relatively expensive at least compared to protel) , and you can simulate
any kind of arbitrary elements on a pcb , including vias , edge coupled
stuff, etc. It generates Gerber files .
best regards,
matt tudor, m.s.e.e.
www.rfdatacorp.com
> In message <004a01c0f421$3302e620$02a2fea9@mike>, Mike Reagan
> <[EMAIL PROTECTED]> writes
> >Hello All.
> >I wanted to throw in my two cents:
> >While a Spiraled trace to simulate an inductor might be a desirable
> >accomplishment, I try to convince engineers to stay away from this type
of
> >design. I call it Voodoo design. Unless the trace is designed first by
a
> >very powerful tool that takes into account three dimensional design, the
> >probability of obtaining a coil with any good characteristics is slim and
> >inconsistent. For edge to edge coupling to be effective coupling the
traces
> >would have to be closer than 7 mils apart. Then there is "Q" factor for
> >this inductor, meaning it will be a very poor Quality inductor. I
> >personally think and would suggest finding a real component to design in.
> >Your design will be more reproducible and consistent from board to board,
> >because of a number of problems inherent to varied inconsistencies of a
> >fibers in any board. There are a whole lot of reasons why I would stay
> >away from voodoo design. Sorry Bill, I don't mean to insult you, are
the
> >only TOP GUN registered on this list. But I wouldn't attempt it unless I
> >could fully simulate it at my desired frequency, with prepreg thickness,
> >with known prepreg material, fiber density, dielectric constant, gnd
plane
> >underneath, relative humidity, and it goes on.
> >
> >I will wait for Brad V's Comments on this because he had mentioned his
> >company simulates some of this stuff, right?
> >
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