Three-dimensional Microwave Imaging Research Articles

Three-dimensional inverse-scattering numerical solution within the Rayleigh approximation: Preliminary results

An approach to three-dimensional microwave imaging is proposed. Usually, because of the wide computational resource that is required by this kind of imaging that is based on the full-vector integral equations for the inverse scattering problem, linearizing approximations are employed. In this Letter, we exploit the use of the Rayleigh approximation in conjunction with a previously proposed numerical solution. We will show that the approach requires the same computational load as the one that makes use of the first-order Born approximation, but it provides an improvement in the reconstruction accuracy for a certain range of contrast values. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 15: 173–176, 1997.

High resolution three-dimensional microwave imaging of antennas

A procedure for imaging antenna currents that uses a relationship between the radiated far-field hemisphere and the Fourier transform domain of the source current density distribution is presented. The technique is applied to an array of two orthogonal waveguides, a slotted waveguide array and a reflector antenna. In each case the radiated far-field hemisphere is inverted to produce a high-resolution volumetric image of the antenna currents. Polarization discrimination is demonstrated as is the ability of the technique to 'see behind' blockages by defocusing the foreground. It is shown that accurate distribution is available from the reconstructed image. Selective editing of the Fourier domain of the current distribution is performed to suppress unwanted artifacts in the reconstruction. >