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Proceedings Paper

Reconfigurable metasurface aperture for security screening and microwave imaging
Author(s): Timothy Sleasman; Mohammadreza F. Imani; Michael Boyarsky; Laura Pulido-Mancera; Matthew S. Reynolds; David R. Smith
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Paper Abstract

Microwave imaging systems have seen growing interest in recent decades for applications ranging from security screening to space/earth observation. However, hardware architectures commonly used for this purpose have not seen drastic changes. With the advent of metamaterials a wealth of opportunities have emerged for honing metasurface apertures for microwave imaging systems. Recent thrusts have introduced dynamic reconfigurability directly into the aperture layer, providing powerful capabilities from a physical layer with considerable simplicity. The waveforms generated from such dynamic metasurfaces make them suitable for application in synthetic aperture radar (SAR) and, more generally, computational imaging. In this paper, we investigate a dynamic metasurface aperture capable of performing microwave imaging in the K-band (17.5–26.5 GHz). The proposed aperture is planar and promises an inexpensive fabrication process via printed circuit board techniques. These traits are further augmented by the tunability of dynamic metasurfaces, which provides the dexterity necessary to generate field patterns ranging from a sequence of steered beams to a series of uncorrelated radiation patterns. Imaging is experimentally demonstrated with a voltage-tunable metasurface aperture. We also demonstrate the aperture’s utility in real-time measurements and perform volumetric SAR imaging. The capabilities of a prototype are detailed and the future prospects of general dynamic metasurface apertures are discussed.

Paper Details

Date Published: 11 May 2017
PDF: 10 pages
Proc. SPIE 10189, Passive and Active Millimeter-Wave Imaging XX, 101890G (11 May 2017); doi: 10.1117/12.2262848
Show Author Affiliations
Timothy Sleasman, Duke Univ. (United States)
Mohammadreza F. Imani, Duke Univ. (United States)
Michael Boyarsky, Duke Univ. (United States)
Laura Pulido-Mancera, Duke Univ. (United States)
Matthew S. Reynolds, Univ. of Washington (United States)
David R. Smith, Duke Univ. (United States)


Published in SPIE Proceedings Vol. 10189:
Passive and Active Millimeter-Wave Imaging XX
David A. Wikner; Duncan A. Robertson, Editor(s)

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