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From: David Jefferies
Date: 16 Apr 2002
Time: 07:13:36
Remote Name: 195.92.168.166
Hello.
I'm looking for a convincing explanation of how a circular resonant patch antenna, on a dielectric substrate above a ground plane, actually radiates.
It seems that the currents must be confined to the inside surfaces of the structure, on the opposite faces of the dielectric, and that the metal skin depth is a lot less than the thickness of the patch or of the backplane.
I don't see how the far field point can "see" any currents on this structure.
When such a patch is measured, it is highly resonant, with large Q and narrow bandwidth. This indicates to me that there must be very large standing waves of current on the structure: perhaps some of this current leaks around onto the upper surface and provides a radiation mechanism.
Has anyone seen a convincing explanation of how a patch works? I'd like to write sensibly about this for my web pages at
http://www.ee.surrey.ac.uk/Personal/D.Jefferies/antennas.html
regards
DJJ G6GPR