There are several ways to classify electromagnetic waveguides. Depending
on their boundaries, they can be classified into waveguides with
perfectly reflecting walls or finite impedance walls, as well as open
waveguides. In terms of their applications, there are the low
attenuation and low delay distortion waveguides for telecommunication,
the low crosspolar field waveguides used as feeds for reflector antennas
in frequency reuse schemes, as well as the leaky feeders in continuous
access communication systems. There are also the natural waveguides such
as tunnels and the earth-ionosphere waveguide.
This text is an attempt to give a unified, analytical treatment to most
of these diverse types of waveguides. Emphasis is given to modal
characteristics, modal excitation and mode scattering at longitudinal
discontinuities. The book will serve not only as a text for
undergraduate courses, but also as a reference book for those involved
in research work on electromagnetic waveguides.