Measurements of surface currents on a finite circular tube illuminated by electromagnetic wave

An experiment is designed to confirm a rigorous theory on the three-dimensional electromagnetic scattering from a circular tube of finite length. Both axial and transverse components of the outside total current for the case of
E
polarization have been measured for two finite tubes with
ka = 1.895
and
kh = 0.4827\pi
and
0.724\pi
, both as a function of
z
or
\theta
. Special care was taken to preserve the continuity of the transverse current after each change in the position of the probe. The measured results are in good agreement with the theoretically computed data. Theoretical curves for the corresponding infinite cylinder are also included to show the limitations of using them as approximations to the currents on finite cylinders.