  This paper discusses different approaches used for millimeter wave imaging of
two-dimensional objects. Imaging of a two dimensional object requires reflected
wave data to be collected across two distinct dimensions. In this paper, we
propose a reconstruction method that uses narrowband waveforms along with two
dimensional beam steering. The beam is steered in azimuthal and elevation
direction, which forms the two distinct dimensions required for the
reconstruction. The Reconstruction technique uses inverse Fourier transform
along with amplitude and phase correction factors. In addition, this
reconstruction technique does not require interpolation of the data in either
wavenumber or spatial domain. Use of the two dimensional beam steering offers
better performance in the presence of noise compared with the existing methods,
such as switched array imaging system. Effects of RF impairments such as
quantization of the phase of beam steering weights and timing jitter which add
to phase noise, are analyzed.
