  Effect of anisotropy in the physical tensor description of the negative index
of refraction material (left-handed material, LHM) acting as a substrate is
found on the electromagnetic field distributions. Field distributions are
provided in the GHz region in the cross-section of the uniform microstrip
guided wave structure. It is found from ab initio Green's function calculations
that modifying the tensor can allow control because the wave changes
volumetrically, or switches from volumetric to surface, in its distribution of
fields. Comparison is made of the LHM results to ordinary right-handed material
(RHM) acting as a substrate.
