求解电小尺寸目标散射特性的时域磁场积分方程

Time Domain Magnetic Field Integral Equation for the Scattering Analysis of Electrically Small Objects

在计算电大尺寸光滑目标散射问题时,通常采用的时域磁场积分方程计算简单、快速、准确;但是当处理电小尺寸目标时,通常的磁场积分方程不再准确,必须精确考虑磁场积分方程中包含的立体角信息。通过在测试三角形区域进行特殊的采样,并充分计算测试区的立体角,修正了时域磁场积分方程以满足电小目标散射计算的需求。计算结果与时域电场积分方程的结果相一致,说明了方法的有效性。

The standard time domain magnetic field integral equation （TDMFIE） is simple, efficient when it is ap- plied for scattering analysis of electrically large objects. But TDMFIE is inaccurate when electrically small object is considered because of the solid angle factor. TDMFIE is modified by special sampling on the testing triangle and accurate computation of solid angle. The correspond results agree with that of time domain electric field integral equation （TDEFIE）, which demonstrate the validity of the presented method.