Penetrating 3-D Imaging at 4- and 25-m Range Using a Submillimeter-Wave Radar

Cooper, Ken B.; Dengler, Robert J.; Llombart, Nuria; Bryllert, Tomas; Chattopadhyay, Goutam; Schlecht, Erich; Gill, John; Lee, C.; Skalare, A.; Mehdi, Imran; Siegel, Peter H.

doi:10.1109/tmtt.2008.2007081

Cited by 314 publications

(140 citation statements)

References 8 publications

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“…The THz imager described in [1] uses a silicon etalon beam splitter to duplex the transmit and receive signals. In the antenna geometry of Fig.…”

Section: Reflector Antenna Geometrymentioning

confidence: 99%

“…One promising approach to THz imaging utilizes the frequency-modulated continuouswave (FMCW) radar technique, where at submillimeter wavelengths, ultra-high resolution range measurements are used to detect objects concealed under clothing. In the FMCW radar imager described in [1], a 570-600 GHz radar beam is focused onto targets at 4 m standoff range using a folded-path antenna system with a 40 cm diameter ellipsoidal main reflector. To obtain imagery with a single transceiver located at the reflector's close focus, the entire radar platform was mechanically rotated about two axes at rates of a few degrees per second.…”

mentioning

confidence: 99%

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Confocal Ellipsoidal Reflector System for a Mechanically Scanned Active Terahertz Imager

Llombart

Cooper

Dengler

et al. 2010

IEEE Trans. Antennas Propagat.

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Abstract-We present the design of a reflector system that can rapidly scan and refocus a terahertz beam for high-resolution standoff imaging applications. The proposed optical system utilizes a confocal Gregorian geometry with a small mechanical rotating mirror and an axial displacement of the feed. For operation at submillimeter wavelengths and standoff ranges of many meters, the imaging targets are electrically very close to the antenna aperture. Therefore the main reflector surface must be an ellipse, instead of a parabola, in order to achieve the best imaging performance. Here we demonstrate how a simple design equivalence can be used to generalize the design of a Gregorian reflector system based on a paraboloidal main reflector to one with an ellipsoidal main reflector. The system parameters are determined by minimizing the optical path length error, and the results are validated with numerical simulations from the commercial antenna software package GRASP. The system is able to scan the beam over 0.5 m in cross-range at a 25 m standoff range with less than 1% increase of the half-power beam-width.

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“…The THz imager described in [1] uses a silicon etalon beam splitter to duplex the transmit and receive signals. In the antenna geometry of Fig.…”

Section: Reflector Antenna Geometrymentioning

confidence: 99%

mentioning

confidence: 99%

Confocal Ellipsoidal Reflector System for a Mechanically Scanned Active Terahertz Imager

Llombart

Cooper

Dengler

et al. 2010

IEEE Trans. Antennas Propagat.

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“…X-radiation have a wavelength in the range of 10-0.01 nm (3·10 16 -3·10 19 Hz) and enough energy to pass through cloth and human tissues. In addition to cloth penetration, XR imaging provides high image resolution.…”

Section: X-ray Imagingmentioning

confidence: 99%

“…Specifically, MMW band spreads from 30 to 300 GHz (10-1 mm) while the SMW band lies in the range of 0.3-3 THz (1-0.1 mm) [4]. The use of MMW/SMW of radiation within imaging systems is currently an active field of research due to some of its interesting properties [15][16][17][18][19][20]. The penetration through clothing and other nonpolar dielectric materials even at stand off ranges is one of the most important MMWs and SMWs abilities.…”

Section: Millimeter and Submillimeter Wave Imagingmentioning

confidence: 99%

Biometrics beyond the Visible Spectrum: Imaging Technologies and Applications

Moreno-Moreno

Fiérrez

Ortega‐Garcia

2009

Biometric ID Management and Multimodal Communication

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Esta es la versión de autor de la comunicación de congreso publicada en: This is an author produced version of a paper published in: Abstract. Human body images acquired at visible spectrum have inherent restrictions that hinder the performance of person recognition systems built using that kind of information (e.g. scene artefacts under varying illumination conditions). One promising approach for dealing with those limitations is using images acquired beyond the visible spectrum. This paper reviews some of the existing human body imaging technologies working beyond the visible spectrum (X-ray, Infrared, Millimeter and Submillimeter Wave imaging technologies). The benefits and drawbacks of each technology and their biometric applications are presented.

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“…Millimeter and sub-millimeter wave bands not only offer a convenient solution for the spectrum congestion problem but also give a very high data transmission rate [1][2][3] and increased security systems [4,5] which make it vital for many military and civilian applications [6,7]. There are lots of improvements going on nowadays in using these bands, and they are expected to deprecate most of the currently used systems in the near future.…”

Section: Introductionmentioning

confidence: 99%

Linear and Nonlinear Properties of Graphene at Millimeter-Wave for Multiplier and Mixer Applications

Samir¹,

El‐Sherif²,

Kishk³

et al. 2018

PIER C

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Abstract-In this paper linear and nonlinear properties of graphene at millimeter wave frequency band are investigated. The nonlinear properties of the graphene are utilized to design frequency multiplier and mixer for millimeter wave applications. A patch of graphene is deposited on the dielectric image guide that will generate higher order harmonics. The amplitude of harmonics is optimized based on the dimensions of the graphene patch on top of the dielectric image guide. A frequency multiplier and mixer are designed, which utilize the second harmonics generated through graphene. The nonlinear behavior of the proposed designs has been simulated in the 50-75 GHz input signal frequency range. A conversion efficiency of −23 dB is obtained for the second harmonic for the frequency doubler. The frequency mixer is designed to mix two frequencies in V-band using dielectric image guide as the waveguide. A −28 dB conversion efficiency is simulated on a dielectric image-guide platform.

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Penetrating 3-D Imaging at 4- and 25-m Range Using a Submillimeter-Wave Radar

Cited by 314 publications

References 8 publications

Confocal Ellipsoidal Reflector System for a Mechanically Scanned Active Terahertz Imager

Confocal Ellipsoidal Reflector System for a Mechanically Scanned Active Terahertz Imager

Biometrics beyond the Visible Spectrum: Imaging Technologies and Applications

Linear and Nonlinear Properties of Graphene at Millimeter-Wave for Multiplier and Mixer Applications

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