| The Electromagnetic (EM) scattering characterizations of buried objects in a planar layered background, especially embedded in the near-surface, are of great researching values in geophysical exploration, environmental characterization, subsurface sensing of landmines, unexploded ordnance and underground structures. In particular, when analyzing and designing a microwave circuit, microstrip antenna, high-speed PCB or microwave and millimeter integrated circuit, the EM scattering of these objects is very useful for antenna and microwave engineers.This paper employs the stabilized biconjugate gradient with fast Fourier transform method (BCGS-FFT) to analyze the EM scattering characterizations of arbitrary shaped buried objects embedded in an isotropic planar layered background. Due to application of the FFT and the fast iterative solver BCGS, the CPU time and memory cost of this BCGS-FFT method is O (MogN) and O (N), respectively, significantly more efficient than the method of moments (MoM). As a result, this method is capable of solving large-scale EM scattering problems in a planarly layered background. The numerical results reveal the structure characterization of the medium and the relative position of the object, and thus prove the validity of the algorithm. Furthermore, the BCGS-FFT method is improved in this paper so that it can be directly applied to fast analysis of phased penetrated-ground radar antenna.Considering the need of practical application, this paper simulates the radiation of near-surface antenna stimulated by single pulse, the transient scattering of objects illuminated by bunch electromagnetic wave, and the problems such like coupling between antennas and objects, in which the author gives the qualitative analysis of simulation results and draws a primary conclusion. This task not only lays a theory foundation for the design of the phased ground-penetrated radar to detect near objects, but provide the basis for the inversion.
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