  We have developed a model for the polarization of curvature radiation by
taking into account the polar-cap-current induced perturbation on the dipolar
magnetic field. We present the effects of the polar cap current on the pulsar
radio emission in an artificial case when the rotation effects, such as
aberration and retardation, are absent. Our model indicates that the intensity
components and the polarization angle inflection point can be shifted to either
the leading or the trailing side depending upon the prevailing conditions in
the viewing geometry, the non-uniformity in source distribution (modulation),
and the polar cap-current-induced perturbation. Also, we find evidence for the
origin of symmetric-type circular polarization in addition to the antisymmetric
type. Our model predicts a stronger trailing component compared to that on the
leading side of a given cone under some specific conditions.
