Conducting polymers are excellent microwave absorbers
and they show technological advantage when compared
with inorganic electromagnetic absorbing materials,
being light weight , easily processable, and the ability
of changing the electromagnetic properties with nature
and amount of dopants, synthesis conditions, etc. In this
paper we report the synthesis, dielectric properties, and
expected application of conducting composites based
on polyaniline (PAN). Cyclohexanone soluble conducting
PAN composites of microwave conductivity 12.5 S/m
was synthesized by the in situ polymerization of aniline
in the presence of emulsion grade polyvinyl chloride. The
dielectric properties of the composites, especially the
dielectric loss, conductivity, dielectric heating coefficient
, absorption coefficient, and penetration depth,
were studied using a HP8510 vector network analyzer.
The microwave absorption of the composites were studied
at different frequency bands i.e, S, C, and X bands
(2-12 GHz). The absorption coefficient was found to be
higher than 200 m -' and it can be used for making microwave
absorbers in space applications .