The great value of the theory of thin antennas is substantiated. Models of a
linear radiator shaped as a straight perfectly conducting filament with zero and finite
radii and as a straight circular thin-wall cylinder are described. Methods of calculation,
which were applied before resorting to integral equations, are presented, in particular
the induced emf method, its first and second formulations. Results of its application to
symmetrical dipoles, to radiators with displaced feed point, to radiators with constant
and piecewise constant surface impedance and lumped loads, to folded and multiradiators
antenna are given.
Keywords: Antenna theory, Conducting filament, Constant impedance, Current
derivative jump, Displaced feed point, First formulation, Folded antenna, Induced
emf method, Lumped loads, Modified solution method, Multi-radiators antenna,
Oscillating power, Piecewise constant impedance, Poynting’s vector, Reactive
power, Second formulation, Sinusoidal distribution, Stepped impedance long line,
Surface impedance, Symmetrical dipole, Thin antennas, Thin-wall cylinder.
