  Beam steering enables manipulation of the electromagnetic radiation patterns
in antenna array systems. A methodology for steering beams in the near field of
a planar antenna array with known phase wavefront functions towards arbitrary
azimuth and elevation angles is described in this paper. Rotation of the phase
wavefront function is used while preserving the shape. The phase shifts for
antenna element excitation currents are determined based on the distances from
antenna elements to the nearest point on the rotated wavefront. Beam steering
utilizing a Gaussian and a Bessel beam is studied. Phase distribution examples
for various steering directions are considered. For Bessel beam steering, a
discussion on the resulting beam shapes and the steering impact on the
polarization mismatch is provided. The results show a non-negligible magnitude
of the cross-polarization with values depending on the steering direction.
