Rational Krylov reduced order modeling of frequency selective surfaces through the blazing onset using Woodbury singularity extraction

The authors use rational Krylov model order reduction (RKMOR) to find the TE and TM copolarized reflection coefficients for both the specular and first blazing modes (four coefficients in all) for a FSS when excited by a plane wave travelling with /spl theta/8=30/spl deg/ and /spl phi/=0/spl deg/. The power reflection coefficients generated by the MoM and an order ten reduced order model versus the "normalized frequency" are shown. It was notice that though the FSS blazes at a normalized frequency of 0.667, the RKMOR technique interpolates well in that neighborhood.