Only a single delta function feed is required at the center, similar
to an electric dipole, but the delta function approximates a small
wire jumping across the slot - such as the center conductor of a coax
or a stripline - instead of a delta gap as in the wire.
The most common and easiest way to model it is on an infinite ground
plane. Electric field basis functions fill the slot. This method
will not yield conductor losses if you need to know them. There are a
number of papers published describing details.
Space Domain Moment Method:
Weller and Katehi, IEEE Trans. Ant. and Prop., Dec. 1995, pp 1423-1428
Spectral Domain Moment Method:
Porter and Gearhart, IEEE Trans. Ant. and Prop., March 1998. pp
383-390 Liu, Horng and Alexopoulos, IEEE Trans. Ant. and Prop. October
1995., p 1143-4
A good theory paper:
Butler and Umashankar, Radio Science, July 1976 pp 611-619
There are other good references that can be found in the
bibliographies of the above papers.
The approach used by Liu is probably the simplest to implement, but
perhaps not the most numerically efficient. For a single slot,
details in the following Spectral Domain paper are both numerically
efficient and easy to implement:
Eleftheriades and Rebiez, Int. Journal of Infrared and Millimeter Waves,
1993, vol 14. no. 10, pp. 1925-,
Brad Porter
Raytheon Company
Sudbury, MA
porterb_at_bicnet.com
Received on Thu Jan 20 2000 - 01:37:56 EST
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