Title :
An implementation of the impedance-boundary combined field integral equation moment method for arbitrarily shaped objects
Author_Institution :
Electr. & Comput. Eng., Oklahoma State Univ., Stillwater, OK
Abstract :
Impedance boundaries have been used to represent the electromagnetic scattering from various structures such as high-conductivity dielectrics, dielectric-coated conducting objects, and corrugated surfaces. Sebak and Shafai applied the moment method using pulse current basis functions to the impedance-boundary magnetic field integral equation (IB-MFIE), showing that it accurately predicted the bistatic scattering from arbitrarily shaped objects include spheres and cylinders. Glisson [2] used the impedance-boundary electric field integral equation (IB-EFIE) with RWG basis functions to find the backscattering from spheres. The IB-EFIE gave accurate cross-sections with small-radius spheres, but the accuracy was seriously degraded at frequencies near and above the resonances associated with perfectly conducting spheres. Rogers [3] showed that both the IB-EFIE and IB-MFIE are susceptible to the closed-body resonance effects, and demonstrated that the resonances could be prevented by using the impedance-boundary combined-field integral equation (IB-CFIE). Rogers implemented the IB-CFIE only for bodies of revolution.
Keywords :
backscatter; magnetic field integral equations; arbitrarily shaped objects; bistatic scattering; combined-field integral equation; conductivity dielectrics; dielectric-coated conducting objects; electric field integral equation; electromagnetic scattering; impedance-boundary combined field integral equation; magnetic field integral equation; moment method; pulse current basis functions; Backscatter; Corrugated surfaces; Dielectrics; Electromagnetic scattering; Integral equations; Magnetic fields; Moment methods; Pulse shaping methods; Resonance; Surface impedance;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2008. AP-S 2008. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2041-4
Electronic_ISBN :
978-1-4244-2042-1
DOI :
10.1109/APS.2008.4619509