The length of the thermal connectors is defined by the Thermal isolation value in the Design Rules” Supply tab.ġ. 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. This applies to vias as well if the via option has been activated in the design rules. 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. Overlapping POLYGONS with the same signal names are simply drawn one over the other. The rank property works only for POLYGONS with different signals. POLYGONS with the same rank are checked by the DRC to ensure that there are no shorts. If it is overlapped by a higher rank polygon the overlap area is cut out from the lower ranked POLYGON. A POLYGON with rank = 6 has the lowest priority. 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. The Rank value determines which POLYGONS are to be subtracted from others. Rank – set values in this box to prevent overlapping POLYGONS from creating shorts. Picture below shows the standard soldermask window around a pad – 0.1 mm on all sides. Check our PCB Design Guidelines for Soldermask to choose a tolerance. For tight complex designs, we can accept smaller values. An isolation distance of 0.25 mm compensates for any manufacturing tolerance when the soldermask is applied and ensures that there are no exposed areas on the copper plane which could short to an adjacent pad. The soldermask window around a pad is typically 0.1 mm on all sides. If there is enough space in the layout, we recommend a minimum isolation between plane and copper of 0.25mm. Set the value to 0 if you want to use the isolation value defined in the DRC Rules.
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Isolate – defines the isolation distance between the POLYGON and all other copper objects that do not carry the same electrical signal or objects in the Dimension, tRestrict or bRestrict layer. Run again the command Ratsnest and the Polygon with open space is displayed. Draw a Polygon and set the option in Properties to Cutout. The CUTOUT option is only used to define the open space and therefore it does not generate additional data. It is the only case where a POLYGON can be drawn with a line of width “0”. Cutouts are typically used to define restricted areas in polygons on inner signal layers. The special type CUTOUT is used to define POLYGONS that are cut out (subtracted) from all other signal POLYGONS within the same layer. You can find more information in our PCB Design Guidelines The combination of line width and spacing must leave openings large enough for production. If you choose Hatch fill, make sure that you set a suitable value under Spacing. The preferred fill is a whole area (Solid) fill, but you can also select a grid (Hatch) fill.
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In any case the line used to fill the polygon should never be less than the minimum line width in the layout. Too fine lines create unnecessarily large files when you output the data for manufacture. TIP: Select the largest possible line width. Width – specifies the thickness of the line used to fill the POLYGON. Or, under Properties, right click on the POLYGON outline. Polygon options can be changed via the parameter toolbar Use RIPUP to switch back to outline mode. When you have solved the error use the RATSNEST command again, to calculate and display the surface of the POLYGON. An Error Message will appear: “Signal contains an invalid Polygon”. Type in the command Line “Ratsnest” or use the Command button.Ī Polygon which overlaps itself cannot be calculated. Use the RATSNEST command to calculate and display the surface of the Polygon.
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As a ground plane under RF lines like microstripe or coplanar lines.POLYGONS are needed for a number of different tasks in a PCB design: