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Simple polygons producing large gerber files

e14 Contributor

Guys,

 

I'm making a planar PCB antenna.  So, I have two polygons which are

essentially ~200mm x 15mm rectangles with a 45 degree chamfer on one

corner on each shape.  I drew these shape on the top copper layer with

the polygon tool.  When I generate gerber files they warn me that the

shapes on signals N$2 and N$3 (the two polygons) will generate large

gerber files, and in fact I get about a ~450kb gerber file.

 

For the life of me I can't see why this should be the case, each polygon

is simply defined by five x,y coordinates which are all nice integer

numbers in mm. The application I'm using to read this gerber data is

having issues with this size gerber file.

 

On a related subject - the two polygons are mirror images reflected

across the vertical axis.  I thought that I could just draw one polygon

and then mirror it.  Unfortunately, mirroring also flips it to the

bottom layer of the board.  Is there a way to mirror an object and have

it stay on the original layer?  It not this would be a nice feature to

have.

 

-Michael

 

Parents

  • The line width of the polygon can make a difference.

     

    "Michael Sansom" <mssansom@hotmail.com> wrote in message

    news:i033g5$s30$1@cheetah.cadsoft.de...

    Guys,

    >

    I'm making a planar PCB antenna.  So, I have two polygons which are

    essentially ~200mm x 15mm rectangles with a 45 degree chamfer on one

    corner on each shape.  I drew these shape on the top copper layer with the

    polygon tool.  When I generate gerber files they warn me that the shapes

    on signals N$2 and N$3 (the two polygons) will generate large gerber

    files, and in fact I get about a ~450kb gerber file.

    >

    For the life of me I can't see why this should be the case, each polygon

    is simply defined by five x,y coordinates which are all nice integer

    numbers in mm. The application I'm using to read this gerber data is

    having issues with this size gerber file.

    >

    On a related subject - the two polygons are mirror images reflected across

    the vertical axis.  I thought that I could just draw one polygon and then

    mirror it.  Unfortunately, mirroring also flips it to the bottom layer of

    the board.  Is there a way to mirror an object and have it stay on the

    original layer?  It not this would be a nice feature to have.

    >

    -Michael

     

     

     

Reply

  • The line width of the polygon can make a difference.

     

    "Michael Sansom" <mssansom@hotmail.com> wrote in message

    news:i033g5$s30$1@cheetah.cadsoft.de...

    Guys,

    >

    I'm making a planar PCB antenna.  So, I have two polygons which are

    essentially ~200mm x 15mm rectangles with a 45 degree chamfer on one

    corner on each shape.  I drew these shape on the top copper layer with the

    polygon tool.  When I generate gerber files they warn me that the shapes

    on signals N$2 and N$3 (the two polygons) will generate large gerber

    files, and in fact I get about a ~450kb gerber file.

    >

    For the life of me I can't see why this should be the case, each polygon

    is simply defined by five x,y coordinates which are all nice integer

    numbers in mm. The application I'm using to read this gerber data is

    having issues with this size gerber file.

    >

    On a related subject - the two polygons are mirror images reflected across

    the vertical axis.  I thought that I could just draw one polygon and then

    mirror it.  Unfortunately, mirroring also flips it to the bottom layer of

    the board.  Is there a way to mirror an object and have it stay on the

    original layer?  It not this would be a nice feature to have.

    >

    -Michael

     

     

     

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