Combining the ATLM scheme with rotation of the polarization states of
the mesh lines by 45 degrees the computational effort can be reduced c
ompared with conventional TLM by up to 75%. It is shown that by this w
ay the conventional TLM scheme degenerates into four independent compu
tational schemes, each of which contains the full information. Besides
the reduction of the computational effort and storage requirements, a
lso spurious modes and nonphysical solutions are eliminated.