Rank – set values in this box to prevent overlapping POLYGONS from creating shorts. The Rank value determines which POLYGONS are to be subtracted from others. A POLYGON with rank = 1 has the highest priority in the Layout, so no other POLYGON drawn in the layout is ever subtracted from it. A POLYGON with rank = 6 has the lowest priority. If it is overlapped by a higher rank polygon the overlap area is cut out from the lower ranked POLYGON. POLYGONS with the same rank are checked by the DRC to ensure that there are no shorts. The rank property works only for POLYGONS with different signals. Overlapping POLYGONS with the same signal names are simply drawn one over the other.
Thermal – determines whether pads and drill holes in the POLYGON are connected using Thermal relief pads, or if they are connected directly to the copper plane. This applies to vias as well if the via option has been activated in the design rules.
The width of the thermal connectors should normally be set as half of the pad”s drill diameter, with a minimum value of the wire width of the POLYGON and a maximum of twice the wire width. The length of the thermal connectors is defined by the Thermal isolation value in the Design Rules” Supply tab.
1. Don”t set too fine a wire width for the POLYGON, or the thermal connectors won”t be able to handle the current load. The DRC will warn if this is the case (see illustration).
2. This also applies to necked POLYGONS. The minimum width of the copper area (neck) is determined by POLYGON’S wire width.
Orphans – Determines if a POLYGON may contain areas (islands) which are not electrically connected to the POLYGON”S signal. If Orphans is set to Off, such un-connected areas won”t be drawn.