BROCHIER , Laurent

This paper presents measurement results to assessthe impact of the mechanical accuracy in a spherical scanner. Twodifferent test case including a 3D antenna characterization and ascattering measurement are proposed.

This paper presents the design of an offset reflectarray illuminated by a printed primary source. The proposed build-up is compatible with flip-chip technology, enabling a direct connection between the RFIC and the antenna source. Measurements are realized using a GSG RF probe and a good agreement is obtained with simulated data

This paper describes a linear combination of Spherical Vector Wave Expansion (SVWE) and Singularity expansion methods (SEM) to compress the radiation pattern of ultrawideband antennas and its application to Through-The-Wall (TTW) measurements. This process is applied and compared between simulated and experimental data in free space and in TTW...

This paper presents the effect of the polarization of antennas used in Ultra-Wideband systems for positioning applications. Measurements have been conducted using the DecaWave DWM1000 module and its antennas on both the transmitter (tag) and receiver (anchor) sides. The received power with the anchor-tag distance were measured with two...

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In this paper, we investigate the possibility to perform accurate measurements in W-band. For this, we are making use of a new measurement system we designed, but was installed by NSI. After correction processing, the SNR values for all frequencies, polarizations dielectric and metallic cylinders remain below 20 dB with a best value at 26 dB at...

In this paper we propose to investigate a mm- Wave radar solution that relies on CW measurements on a reduced scan area and to form radar images with backpropagation. This greatly simplifies the radar architecture and improves the SNR. The response of the antenna, critical in monostatic systems, is removed by normalization with respect to the...

Accurate measurement of high directive antenna has always been a very challenging topic, especially at millimeter waves (mmW) because of the very short wave-length. MmW radiating system are more efficient with a direct connection between the electronic circuits and the antenna. In order to characterize accurately the antenna, RF probe feeding...

The purpose of this work is to perform the joint design of a classification system including both a radar sensor and an image processing software. Experimental data were generated with a three-dimensional scanner. The criterion which rules the design is the false recognition rate, which should be as small as possible. The classifier involved is...

In this paper we present a complete process that goes from measurements to image extraction with the objective to help radar designers to set their system specifications. We focus on objects of interest for security scanners and therefore choose to perform the tests on a ceramic knife and a fake gun made of aluminum. We highlight polarization...

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Dans ce résumé, nous présentons les résultats de travaux exploratoires sur la détection des défauts dans les pommes par mesure de diffraction en gamme millimétrique. Nous montrons de premiers résultats obtenus sur pommes saines et abîmées à 92 GHz. Afin d'étudier séparément les effets de taille, composition moyenne de la pomme et altérations...

In this paper, a 5G MIMO mobile phone prototype including four antennas working in the 10-13.2 GHz band is designed. The objective of the study is to evaluate the negative impact due to the user's hand in frequencies higher than 10 GHz. A 3D spherical near-field scanner with fixed Antenna Under Test (AUT) is leveraged in order to measure a 3D...

This paper is a proof of concept proposing and describing a complete workflow to differentiate healthy from damaged apples, starting with mmWave measurements and ending with a classification based on Support Vector Machine. The method has proven to be successful with only 6% error when scan angle and frequency diversity are used. In a first...

A specific set-up for probe-fed antenna pattern measurements with an articulated arm has been developed with a 500mm AUT-probe distance. This pa per will give an example of far-field measurement and highlight its advantages and limitations. A near-field approach to filter the probe effect is investigated. First measurement results, including...

This paper deals with a detailed study of an original system dedicated to scattering measurements of millimeter waves in the W -band. The system's main innovations lie in its high-precision swivel arm, semianechoic environment, flexibility for positioning the object on the measurement tower, as well as the postprocessing developed to correct...

A W-band high gain lens antenna has been realised and measured. A hyperbolic lens made in ECCOSTOCK 0005 is associated to an optimised modified circular horn related to a circular-to-rectangular waveguide transition in order to fit the WR-10 standard waveguide. The antenna provides more than 30 dBi gain between 75 and 110 GHz. It is competitive...

Nowadays, mm-waves are targeted for numerous applications, among which security ones. With the increasing threats of attacks all over the world, concealed objects detection has become a major concern. Systems already exist but they need to be improved for the upcoming requirement of imaging a moving crowd. Having a real-time image is one of the...

Scattering properties of millimeter waves (MMW) remain relatively unknown compared to lower frequency bands, although their study is of interest considering the increasing number of civil applications, especially in the W-band. In this paper, we present an efficient measurement set-up that provides scattering measurements with spatial and...

A W-band high gain lens antenna has been realised and measured. A hyperbolic lens made in ECCOSTOCK 0005 is associated to an optimised modified circular horn related to a circular-to-rectangular waveguide transition in order to fit the WR-10 standard waveguide. The antenna provides more than 30 dBi gain between 75 and 110 GHz. It is competitive...

We present an innovative system dedicated to millimeter wave scattering measurements in W-band. The principal innovations are the high-precision swivel arm, use of a semi-anechoic environment, flexibility for positioning the object under study, and post-processing to correct measurement errors. Different test objects are used for evaluating the...

In order to map the migration and introduction of farming into Europe during the 7th and 6th millennia Before Common Era, archaeologists have made a connection between the study of pottery and farming migration. We are interested here in the classification of pottery into coiling and spiral types, based on their manufacturing techniques. To...

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Fast and efficient non-Destructive evaluation methods for food control is still an ongoing field of research. Wehave recently proposed to combine W-band imaging with nonlinear SVM classifier to sort out healthy from damaged fruits for a single variety of fruits. We have tested it on apples and peaches separately with a mean accuracy of 96%. We...