  In this paper the transmission of electromagnetic waves through a
one-dimensional lossy photonic crystal consisting of layers with negative and
positive refractive indices is investigated. The behavior and characteristics
of the bandwidth, the depth and the central frequency of the zero-n gap for
different incidence angles, polarization, loss factor and ratios of thickness
of the layers are studied. The results show that the gap is very sensitive to
the incidence angle, polarization and the thickness ratio, but it is nearly
insensitive to small loss factor. Such properties are quite useful in designing
new types of edge filters and other optical devices in microwave engineering.
