Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide You should look at your geometry and, if necessary, divide it up into Manhattan and non-Manhattan polygons using the Edit ⇒ Divide Polygon. Then set the Manhattan polygons to staircase fill and the non-Manhattan polygons to Conformal fill. For example, the spiral conductor shown below contains Manhattan sections in the feed lines and non-Manhattan sections in the circular spiral. It should be divided up such that the feedlines are represented by polygons set to staircase fill, and the circular spiral is another polygon set to Conformal fill. Conformal Staircase Fill The exception to this rule is when relatively small Manhattan polygons are between conformal mesh polygons. In that case, the inefficiency of switching so frequently between staircase and conformal mesh outweighs the gain of using Manhattan polygons. In that case, conformal mesh should be applied to all the polygons. An example is shown below. . Normally, these polygons would use staircase fill, but because they are relatively small areas and in between polygons on which you would use conformal mesh, it is more efficient to apply conformal meshing to these Manhattan polygons. 192
Chapter 12 Conformal Mesh Boundaries Should Be Vertical or Horizontal For the most efficient results, the boundaries between polygons using conformal meshing and rectangular subsectioning should be vertical or horizontal as shown in the first picture below. Diagonal boundaries, as shown in the second picture, make the analysis less efficient. Polygon with rectangular subsections. Polygon with conformal subsections. Vertical Boundary Polygon with rectangular subsections. Polygon with conformal subsections. Diagonal Boundary Cell Size and Processing Time Care should be taken when choosing your cell size when using conformal mesh. Many users, especially experienced Sonnet users, will estimate processing time based on the amount of memory required to analyze a circuit. The amount of memory used for conformal mesh can be deceptive. Using a smaller cell size in a circuit which uses conformal mesh may not increase the required memory but will have a noticeable effect on processing time. The significant factor in determining processing time with conformal meshing is the number of metalized cells needed to construct a conformal section. The number of conformal mesh cells displayed as the result of the Estimate Memory command may be more reliably used as a guideline. 193
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