Two-dimensional Quasi-monostatic Millimeter-wave Imaging of Metallic Object in the Near-field Region
Date Issued
2015
Date
2015
Author(s)
Yang, Ping-Hsueh
Abstract
This thesis is based-on the microwave holography to develop a millimeter-wave imaging system. In this study a metallic object is illuminated by a millimeter-wave at 65 GHz, the object scattered field including amplitude and phase is recorded in a quasi-monostatic two-dimensional near-field backscattering arrangement. The millimeter-wave image of scattering object is reconstructed through an image reconstruction algorithm. In the analysis, the scattering metallic object is illuminated by a spherical wave, under physical optics approximation, its scattered field over a quasi-monostatic two-dimensional near-field backscattering arrangement is derived. The object Fourier space data is then recorded using angular diversity method. In the measurement a horn antenna is used as the transmitting antenna and an open-ended waveguide as the receiving probe antenna. The transmitting antenna response closes to impulse shape in the Fourier space and receiving probe has a small receiving aperture. Experiment results of the millimeter image of different types of metallic objects with millimeter resolution are shown in good agreement with the simulation results.
Subjects
Millimeter-wave image
quasi-monostatic backscattering
resolution
Type
thesis
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