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Ground plane within a ground plane?

rickford66

Hello all.  I'm currently using Eagle 6.5.0.  I want to put a ground all over my board on one of the inner layers.  It will cover my entire board with the exception of one small area.  In this area, I want to put another ground that is isolated from the larger ground all around it.  They must be on the same layer.  I tried drawing another polygon, expecting the existing all-over ground to give clearance, but that's not what happened.  No clearance was given.  I then drew around the area with a line and clearance was given for that.  That doesn't seem like a very clean way to do this.  What is the proper way to handle this?

Thanks.

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    The reason for more than one ground plane is that one of the circuits is electrically isolated from the others.  They're coupled together with opto-isolators.

     

    I had already tried giving it a different name, as I would need to to get all the nets of that name to connect to it.  Giving it a higher rank than the surrounding plane did the trick.  There is now a small gap between the isolated ground and the rest of the ground.  Thanks.

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    The reason for more than one ground plane is that one of the circuits is electrically isolated from the others.  They're coupled together with opto-isolators.

     

    I had already tried giving it a different name, as I would need to to get all the nets of that name to connect to it.  Giving it a higher rank than the surrounding plane did the trick.  There is now a small gap between the isolated ground and the rest of the ground.  Thanks.

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