Passive Millimetre-wave Imaging with a Planar Diffraction Antenna

Harmer, Stuart W., Shylob, Sergiy, Sydorenkob, Yuriy, Dundonaldc, Douglas and Wheelerc, Dana (2014) Passive Millimetre-wave Imaging with a Planar Diffraction Antenna. IEEE Transactions on Computers. pp. 1095-1099. ISSN 0018-9340

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Abstract

A dispersive antenna, formed by locating a
dielectric sheet waveguide in the near-field zone of a millimetric
scale diffraction grating, is described for the application of
passive millimeter-wave imaging in the W-band. Two
dimensional radiometric contrast images are formed by
frequency scanning in the radial direction of the image and
mechanically scanning in the azimuthal direction. Mechanical
scanning is by means of rotation of the antenna at a uniform
angular speed, while frequency scanning is achieved by careful
selection of antenna parameters to provide a near linear
dependence of beam angular position with frequency of ~ 1
degree per GHz. The imaging system operates over the frequency
range 84-100 GHz and utilizes a single millimeter-wave LNA
(Low Noise Amplifier) and mixer to produce a microwave
frequency intermediate frequency; further down conversion
stages result in 64 baseband channels. In this way, the 16 GHz
operational bandwidth is divided into 64 equal width frequency
channels, giving the system a field of view of ~ 16 degrees.

Item Type: Article
Additional Information: Department of Engineering and Applied Design 2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Conference took place 23-25 July 2014 in Manchester, United Kingdom ISBN: 9781479925810
Uncontrolled Keywords: Antennas, Electromagnetic waveguides, Diffraction, Imaging, Dielectrics, Diffraction gratings, Surface waves, antenna, concealed weapon detection, millimeterwave, passive imaging system
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Event Title: 2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)
Event Location: Manchester
Event Dates: 23-25 July 2014
Related URLs:
Depositing User: Stuart Harmer
Date Deposited: 11 Oct 2019 15:04
Last Modified: 11 Oct 2019 15:04
URI: http://eprints.chi.ac.uk/id/eprint/4877

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