**Authors:**Zicong Mei

**Source:**FERMAT, Articles, 2016-Vol15-May_Jun-003

**Abstract:**The frequency domain hybrid Method of
Moment (MoM) and Physical Optics (PO) usually requires
a iteration between MoM and PO region. This is a
reasonable choice for frequency domain because most of
the computation cost is in factorizing the MoM matrix and
while the cost of back substitution to the matrix equation
is negligible. But it is not the case for the time domain
version. In time domain method, the back substitution is
the major bottle neck for computation time because it is
done for each time step for marching-on-in-time or order
step for marching-on-in-degree. So the iteration between
MoM and PO region become costly because it requires to
compute all the time or order steps for each iteration. In
this paper, I presented a method that can avoid this
iteration and thus speed up the computation speed for
several times.

**Index Terms:**Method of Moments (MoM), time
domain electric field integral equation (TD-EFIE),
physical optics (PO).

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