I think a few sites exist having serrations like that. Typically shaped with a cosine taper or triangular, with a spatial distribution which is optimized to minimize edge reflections. Interesting concept that has been used in a wide variety of applications to eliminate edge reflections caused by an abrupt transition from reflecting surface to free space, like compact ranges and reflector dish antennas. This concept will work particularly well on a roof-top OATS where there is no surrounding dirt to transition the ground plane in to.
The reduction in edge reflections will be better for a smaller OATS since these edge reflections become more noticable with smaller ground plane size. Hence the performance improvement for a smaller OATS will be considerably better. There are several papers on this type of edge termination used in compact ranges, reflector antennas, radar targets etc, for reducing edge reflections and side lobe levels. Check AMTA proceedings or IEEE Transactions on Antennas and Propagation. I don't recall a specific paper on using serrations on an OATS ground plane though. Anybody else? -Robert EMC facility design consultant Robert Bonsen Principal Consultant Orion Scientific email: rbon...@orionscientific.com URL: http://www.orionscientific.com phone: (512) 347 7393; FAX: (512) 328 9240 --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
