Numerical computation of electromagnetic fields in metals using a modifiedfinite-difference time domain method

The Gandhi's scaled-frequency FDTD (finite-difference time domain) method f or electromagnetic fields of low frequency was modified, and so can be adap table to the numerical computation of electromagnetic phenomena in metals. The computational results by a simplified model agreed well with the analyt ical solutions. A new treatment for the interface of metal and dielectric w as also presented, further how and why it is was explained. The low-frequen cy electromagnetic fields were computed successfully due to this treatment. The computational results are in excellent agreement with the experimental ones.