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Low-frequency scattering from two-dimensional perfect conductors

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2 Author(s)
Hansen, T.B. ; Rome Lab., Hanscom AFB, MA, USA ; Yaghjian, A.D.

Exact expressions are obtained for the leading terms in the low-frequency expansions of the far field scattered by an arbitrarily shaped cylinder with finite cross section, an arbitrarily shaped cylindrical bump on a ground plane, and an arbitrarily shaped cylindrical dent in a ground plane. By inserting the low-frequency expansions of the incident plane wave and Green's function into exact integral equations for the surface current, integral equations are obtained for the leading terms in the low-frequency expansions of the surface current. Simple integration of these leading terms of the current expansion yield the leading terms in the low-frequency expansions of the scattered fields. The general low-frequency expressions are confirmed by comparing them to low-frequency results obtained from exact time-harmonic eigenfunction solutions

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Antennas and Propagation, IEEE Transactions on  (Volume:40 ,  Issue: 11 )