Divergence-conforming discretization of second-kind integral equations for the RCS computation in the Rayleigh frequency region
Article first published online: 15 SEP 2011
Copyright 2011 by the American Geophysical Union.
Volume 46, Issue 5, October 2011
How to Cite
2011), Divergence-conforming discretization of second-kind integral equations for the RCS computation in the Rayleigh frequency region, Radio Sci., 46, RS5005, doi:10.1029/2010RS004550., and (
- Issue published online: 15 SEP 2011
- Article first published online: 15 SEP 2011
- Manuscript Accepted: 20 JUN 2011
- Manuscript Revised: 9 JUN 2011
- Manuscript Received: 2 NOV 2010
- basis functions;
- method of moments;
- second-kind integral equations
 The divergence-conforming discretization in method of moments of the magnetic field integral equation (MFIE) shows huge inaccuracies in the computed radar cross section (RCS) at the very low or extremely low frequency regime. We justify theoretically that the presence of this error in the computed RCS can be mitigated to some extent for some sharp-edged objects, where this discrepancy is most evident, through the adoption of uniformly triangular or quadrangular meshings. Moreover, we present two discretizations in method of moments of second-kind integral equations that are free from these huge RCS inaccuracies: (1) a modified implementation of the conventional Rao-Wilton-Glisson (RWG) discretization of the MFIE that provides in two steps the static and dynamic current components so that the nonsolenoidal static contribution can be discarded in the far-field computation; and (2) the loop-star discretization in method of moments of the novel electric-magnetic field integral equation (EMFIE) which provides inherently a null static nonsolenoidal current contribution whereby a static-dynamic decomposition of the current is not required.