FreeLists / si-list / [SI-LIST] Re: "checkered" copper plane question

[christopher.heard@xxxxxxxxxxxx]

Bill,

This is called "copper thieving".  The concept is that the presence of the
small squares will distribute the plating across the area of the pcb.
Theiving is generally used when there are areas on a pcb surface that have
densely packed plated features mixed with very little plated features.

Connectors that have many holes in a small area on a pcb may have theiving
squares added around the connector pattern to control the amount of plating
in the holes.

Chris

**********************
Chris Heard
Teradyne
Work: 603-879-1031
Cell: 508-277-5780
SMS Text Message: 5082775780@xxxxxxxxx
Email: christopher.heard@xxxxxxxxxxxx


                                                                                
                                                        
                      "Bill Mueller"                                            
                                                        
                      <williamm@xxxxxxx         To:      
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                      Sent by:                  Subject: [SI-LIST] "checkered" 
copper plane question                                    
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                      05/13/2003 01:36                                          
                                                        
                      PM                                                        
                                                        
                      Please respond to                                         
                                                        
                      williamm                                                  
                                                        
                                                                                
                                                        
                                                                                
                                                        





Hello all,

I've been hitting a couple embedded design shows lately
and have been seeing a couple prototype boards that have
the top and bottom copper planes 'checkered'

That is instead of a large continuous plane, the plane has
been cut into a grid of 1-2mm squares.

Has anyone else seen this?  What are the benifits of this
type of layout?

Thanks,
-Bill


BTW: The guys manning the booth had answers
ranging from 'I don't know' to 'better aestetics' to 'complex
proprietary EMI interfusion grid' :)

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