  We study the behavior of wave propagation in materials for which not all of
the principle elements of the permeability and permittivity tensors have the
same sign. We find that a wide variety of effects can be realized in such
media, including negative refraction, near-field focusing and high impedance
surface reflection. In particular a bi-layer of these materials can transfer a
field distribution from one side to the other, including near-fields, without
requiring internal exponentially growing waves.
