Interesting google video from 2002 year. They show different wifi antennas and one open panel antenna.
Around 2:20 from start they show this panel antenna :
WaveHAN wifi panel antenna
here is the link to the video :
[googlevideo:http://video.google.com/googleplayer.swf?docid=7123027973173888671&hl=en]
This antenna is very similar to : www.digdice.com/poland-dipole-panel-antenna
Also I remember that I was seen something VERY similar to WaveHan aenna on www.zero13wireless.net
18dbi panel antenna from dlink :
Pretty close π like upper antenna showed on the video – just more dipoles added.
There are not dimentions on this picture π sorry!