Re: [SI-LIST] : 20-H Rule for Power Planes

rbmccammon@mmm.com
Tue, 1 Jun 1999 09:22:48 -0500

S. Weir wrote:
>I don't think so. The geometry of the planes themselves still has the
>abrupt edge. All we have done is to move the center point of the fringing
>pattern so that the field gradients across any susceptor antennae, (
>traces, metalwork ) near the board edge is less. To do what you suggest,
I
>believe that we would need a material where we could grade the dielectric
>constant. Does anyone feel differently?

how about a zig zag edge, with the zigzag period
much less than a wavelenght?

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