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Locally one-dimensional reduced FDTD method for saving memory

CHEN Yiwang,ZHANG Pin,JIN Xiuhai,DAI Meng(College of Field Engineering,PLA Univ.of Sci.& Tech.,Nanjing 210007,China)  
A new memory-efficient finite-difference time-domain(FDTD) method was presented for improving the electromagnetic computational efficiency of electrically large objects,which not only overcomes the courant-friedrich-levy condition,but also reduces the memory requirement.It is proven that the divergence relationship of electric-field and magnetic-field is non-zero even in charge-free regions,when the electric-field and magnetic-field are calculated with 3-D locally one-dimensional finite-difference time-domain(3D-LOD-FDTD) method,and the concrete expression of the divergence relationship is derived.Based on the non-zero divergence relationship and Maxwell curl equations,the 3-D LOD-FDTD which is unconditionally stable is combined with the reduced finite-difference time-domain(R-FDTD) method.The result of the new method is the same as the LOD-FDTD,and it is proved stable by simulation.
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