Optimization of a fast scanning millimetre-wave short range SAR imaging system

Gumbmann, Frank; Tran, Hue; Weinzierl, J.; Schmidt, Lorenz-Peter

doi:10.1109/eurad.2007.4404927

Cited by 13 publications

(12 citation statements)

References 8 publications

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“…The monolithic microwave integrated circuit (MMIC) of the 94 GHz radar (shown in Fig. 4 and 5) module includes a varactor tuned VCO with injection port, very compact transmit and receive amplifiers and a single-ended resistive mixer [1][2][3][4]. The VCO approach in comparison with an upconverter approach has the advantage of much lower spurious frequencies.…”

Section: A Rf Frontendmentioning

confidence: 99%

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Security assistant system combining millimetre wave radar sensors and chemical sensors

Hantscher

Hagelen

Lang

et al. 2011

2011 IEEE International Symposium on Antennas and Propagation (APSURSI)

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This contribution describes a security assistant system comprising distributed millimeter wave radar sensors and chemical sensors. The system is deployable for a wide range of security applications, e. g. passenger security checks on airports, surveillance of people crowds in mass transportation systems or in other security-sensitive areas. The system looks for body-worn hazardous chemical substances in two steps: At first, distributed chemical sensors detect traces of chemicals in a tight tunnel in which multiple persons move freely. These measurements are repeated at different locations whereby the person carrying the chemical can be determined. Afterwards, the radar module scans the person to be screened and yields as the result the exact location of the detected explosive on the body. This facilitates a time-saving manual follow-up check by security staff. In this paper, the main focus is on the system set-up and millimeter wave radars for object imaging

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Section: A Rf Frontendmentioning

confidence: 99%

“…That is why, in the past, a lot of security systems have been developed [1][2], especially for security gates on airports. This includes, among other devices, mainly systems for the detection of explosive substances in the hand luggage as well as metallic and non-metallic objects hidden underneath the cloths of the passenger to be checked.…”

Section: Introductionmentioning

confidence: 99%

Security assistant system combining millimetre wave radar sensors and chemical sensors

Hantscher

Hagelen

Lang

et al. 2011

2011 IEEE International Symposium on Antennas and Propagation (APSURSI)

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“…Compared with the unlicensed band around 60 GHz, -band frequencies, especially around 94 GHz, provide much lower atmospheric attenuation and, therefore, better signal-to-noise ratios (SNRs) [1]. In addition, these frequencies can be used for imaging, enjoying some of the penetration capabilities of RF radiation with shorter wavelength that provides better spatial resolution [2], [3]. The performance of such systems depends, among other factors, on the existence of a controllable, stable, and clean local oscillator (LO) at -band.…”

Section: Introductionmentioning

confidence: 98%

Analysis and design of an X-band-to-W-band CMOS active multiplier with improved harmonic rejection

Mazor

Socher

2013

IEEE Trans. Microwave Theory Techn.

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Third-harmonic current generation in a CMOS transistor is modeled and analyzed including the effects of large-signal clipping and high-frequency roll-off for the application of millimeter-wave (mm-wave) frequency multipliers. Using the model and introducing harmonic rejection techniques, a wideband 8.5-dBm output-power x9 frequency multiplier from -band to -band implemented using a 65-nm CMOS process is designed and characterized. Six transformer coupled differential stages are used, two tripler stages, a -band amplifier, and a three-stage -band power amplifier (PA). The circuit reaches a saturated output power of 8.5 dBm at 91.8 GHz with a 12.2% bandwidth from 88 to 99.5 GHz. Excellent suppression of unwanted harmonics is achieved with better than 31 dBc across all bandwidth. The core design occupies only 390 m 675 m and consumes 438 mW from a 1.2-/2.4-V supply.Index Terms-Amplifiers, CMOS millimeter-wave (mm-wave) frequency multiplier, conduction angle, -band, local oscillator (LO), power amplifier (PA), transformers, -band, -band.

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“…An MMWs antenna with beam scanning function can be realized based on different methods, such as phased arrays [6], [7] or multi-reflector quasi-optics with one or several rotating sub-reflectors [8][9][10][11][12]. In this Letter, a MMWs antenna with fan-scanning beam is designed for the imaging scheme shown in Fig.…”

mentioning

confidence: 99%

“…In such a system, the beams of the transmitting and receiving antennas can scan without moving or rotating the whole antenna or the systems, which guarantees the quick enough imaging speed. Among various kinds of beam scanning schemes proposed for MMWs imaging in recent decade [6][7][8][9][10][11][12], the fan-beam scanning is an effective and interesting way. As illustrated in Fig.…”

mentioning

confidence: 99%

Design, Analysis and Measurement of a Millimeter Wave Antenna Suitable for Stand off Imaging at Checkpoints

Gao

et al. 2011

J Infrared Milli Terahz Waves

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A systematic method is proposed to design a novel beam-scanning antenna with fan-beam, which is suitable for stand off imaging at millimeter wave band. The antenna has not only an elliptical main-reflector to generate thin fan beam, but also a rotating subreflector to realize beam scanning function. All these structures are embedded between two parallel metal plates. A Reversed Ray Tracing Algorithm (RRTA) was introduced to optimize the positions and dimensions of the subreflector and the feed horn. A modified Physical Optics method based on Discrete Real Mirror Image theory (DRMI-PO) was developed to efficiently analyze and optimize the field patterns of the antenna with specific structures. Based on above methods, an antenna working at 200 GHz is designed and fabricated. The measured patterns are in well agreement with the calculated results. It's found that, the total beam scanning range is about 60 cm with its minimum half -power beam widths about 1.7 cm in the scanning direction. All the results validate the design method and potential applications of the antenna in the stand off imaging systems.

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Optimization of a fast scanning millimetre-wave short range SAR imaging system

Cited by 13 publications

References 8 publications

Security assistant system combining millimetre wave radar sensors and chemical sensors

Security assistant system combining millimetre wave radar sensors and chemical sensors

Analysis and design of an X-band-to-W-band CMOS active multiplier with improved harmonic rejection

Design, Analysis and Measurement of a Millimeter Wave Antenna Suitable for Stand off Imaging at Checkpoints

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