Electronic – Eagle: How to connect a Polygon IFA to GND

Looking at the clearance area around your pads, the problem is most likely the pad-to-wire clearance setting in your design rules. If the clearance (minimum distance) is set too high, the polygon place can't connect to the respective PIN. As a result, the polygon won't fill at all.

I can reproduce your problem just fine setting the highlighted value to something like 80 mil.

This polygon fills fine using a pad-to-wire clearance of 8 mil, but not 80 mil.

If that does not solve the problem, it may also be a restriction that you defined in your NET classes. So check those too.

EDIT:
Another idea to narrow down the problem: Got to the polygon settings and check the "Orphans" setting. This will instruct eagle to create polygons, even if there is no way to connected them. If this helps, its definitely the problem that your PAD can't be connected due to some limiting rule.

EDIT2:
As stated in the comments, orphaned polygons will be processed. So it comes down to one of these:

• the wire width of the polygon is set too high
• at least one of the relevant clearance values in the design rules is to large
• at least one of the relevant clearance values in the net class specifications is to large

Starting with v6, Eagle supports true copy&paste. This means that you can copy any part from one design to the windows clipboard and just paste it into another!
You can even copy/paste groups of parts, and between two different eagle instances (this wasn't possible before either).

This is a MAJOR improvement from earlier eagle versions (where the cut/copy/paste was totally counter-intuitive/horrible) and reason enough to upgrade.

Note that you have to use group select + copy even for a single party to make it work. The just paste it in any other schematic.

This way you only "import" the parts into the schematic and don't have to worry about from which library it comes or where it should go at all (assuming this is not a requirement).