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Dussopt L.,CEA Grenoble | Kaouach H.,CEA Grenoble | Lanteri J.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Sauleau R.,CNRS Institute of Electronics and Telecommunications, Rennes
Radioengineering | Year: 2011

This paper presents the design and demonstration of two circularly-polarized transmit-arrays operating in the 60-GHz band and generating a broadside beam and a 30°-tilted beam respectively. These arrays have a fairly simple structure with only three metal layers and are fabricated with a standard printed-circuit board technology. The simulated results show the performances of the unitcells as well as the whole arrays, and detail their power budget. The experimental results in V-band are in very good agreement with the simulations and demonstrate very satisfactory characteristics. Power efficiencies up to 53.7% are reached with a 1-dB gain-bandwidth up to 9.1%, and low cross-polarization level.


Jacquemod G.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Nowak M.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Nowak M.,CEA Grenoble | Colinet E.,CEA Grenoble | And 2 more authors.
Sensors and Actuators, A: Physical | Year: 2010

This paper presents an inductive telemetry platform system for the continuous, real-time and simultaneous remote measurement in harsh environment. First, a SOL (self-oscillating loop) topology for the remote interrogation of wireless battery-less passive sensors is described. This system uses a capacitive sensor configured as an LC-tank whose resonant frequency shifts with the physical measurement. Such a system is generally based on an impedance analyzer in order to measure this frequency shift. In fact, if you increase the distance between the sensor and the reader, the sensibility is not sufficient to use the SOL technique. To overcome this issue, an anti-resonance cancellation, realized with a simple RC cell, is implemented. However, this architecture is dedicated only for a single capacitive sensor. Second, based on an efficient algorithm used for system identification purpose, a readout unit for multiple sensors is proposed. The overall performances of these architectures are analyzed with respect to coupling factor and sensor parameters. Using these two approaches, tests show promising results at mutual coil distances up to 5 cm. © 2010 Elsevier B.V. All rights reserved.


d'Elia U.,MBDA Italia S.p.A. | Pelosi G.,University of Florence | Pichot C.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Selleri S.,University of Florence | And 2 more authors.
Progress in Electromagnetics Research | Year: 2013

State-of-the-art radomes exploit frequency selective media so as to be transparent for the frequencies of the antenna protected by them and opaque to other frequencies. This feature helps in reducing the radar cross section of the antenna and in protecting it from interference. The study of a frequency selective radome is a daunting task, since the radome is usually large in terms of wavelengths, hence full wave analyses are prohibitive. In this paper an approximate technique, based on the physical optics concept, is proposed to attain an estimation of the behavior of a radome shielded antenna in a short time with a commonly available computer. Results are validated against a full wave technique over a relatively small radome.


Villeneuve R.,Princess Grace Hospital Center | Cueille M.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Arnaud-Cormos D.,CNRS XLIM Research Institute, Limoges | David J.-F.,Thales Alenia | And 2 more authors.
IEEE Transactions on Terahertz Science and Technology | Year: 2015

The output power of backward wave oscillators and carcinotrons decrease considerably at high frequencies. This drop in power can be due to the increase in losses and manufacturing defects in their delay lines. In this study, we present measurement methods and setups developed for the characterization of delay-line performance. The developed methods were validated on two scaled-down models of a TH4229 carcinotron operating in frequency bandwidths around 10 and 100 GHz. Measurements of losses and dispersion diagrams were made using two different wave couplings with propagating waveguides and radiating horn antennas. Electromagnetic simulations were performed using finite-difference time-domain (FDTD) code. For both delay lines, the results obtained from measurements with different couplings presented a very good level of consistency with simulations. The measured losses, normalized per delay line elementary cell, were 0.04 and 0.12 dB/cell at 9.5 and 95 GHz, respectively. Accordingly, the normalized ohmic losses were extrapolated at THz frequencies and at 0.95 THz, 0.38 dB/cell was obtained. As a first approximation, only the skin-effect ohmic losses were considered. The ability to characterize delay lines using radiating coupling was demonstrated. © 2011-2012 IEEE.


Mazouni K.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Lanteri J.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Yonemoto N.,Japanese Electronic Navigation Research Institute | Dauvignac J.-Y.,CNRS Laboratory of Electronics, Antennas and Telecommunications | And 2 more authors.
IEEE Transactions on Antennas and Propagation | Year: 2010

The increasing use of millimeter waves for civil radar application, e.g., for automotive or helicopter obstacle detection- requires the development of high gain and low cost antennas in compact form. With this aim, a Fresnel reflector with circular polarization over 5 GHz bandwidth (76-81 GHz) has been designed, fabricated and measured. The gain remains higher than 32 dBi with a peak value of 35 dBi at 79 GHz. For obtaining this performance, specific patches have been designed. They are based on circular rings, rectangular and offset patches. Each of them converts an incident linear electric field into a circular polarized one. © 2006 IEEE.


Mazouni K.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Kohmura A.,Japanese Electronic Navigation Research Institute | Futatsumori S.,Japanese Electronic Navigation Research Institute | Yonemoto N.,Japanese Electronic Navigation Research Institute | And 3 more authors.
European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Radar Conference, EuRAD 2010 | Year: 2010

Foreign objects and debris (FODs) may cause accidents or disasters. The crash of a Concorde jet in France that killed 113 people in 2000 is an example of the danger created by a thin metal strip that fell from another airplane. Recently, FOD detection systems have been developed and tested on airports. Most of them are based on the association of a mm-Wave radar and an optical sensor. This paper describes the investigation, conducted together with the ENRI and LEAT on a wide band mm-Wave radar module. It is composed a 76-81 GHz front-end and a quasi-optical antenna that is a printed Fresnel reflector operating with circular polarization. The purpose of this paper is to compare the measured responses of selected. This work is conducted within a Sakura project funded by the French and Japanese Ministries of Foreign Affairs. © 2010 EuMA.


Dioum I.,Cheikh Anta Diop University | Diallo A.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Luxey C.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Farsi S.M.,Cheikh Anta Diop University
2010 Loughborough Antennas and Propagation Conference, LAPC 2010 | Year: 2010

In this paper, we present a dual-band antenna for Long Term Evolution (LTE) handsets. The proposed antenna is composed of a meandered monopole operating in the 700 MHz band and a parasitic element which radiates in the 2.5-2.7 GHz band. Two identical antennas are then closely positioned on the same 120x50 mm 2 ground plane (Printed Circuit Board) which represents a modern-size PDA-mobile phone. To enhance the port-to-port isolation of the antennas, a neutralization technique is implemented between them. Scattering parameters, radiations patterns and total efficiencies are presented to illustrate the performance of the antenna-system. ©2010 IEEE.


Addaci R.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Diallo A.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Diallo A.,Orange S.A. | Luxey C.,Orange S.A. | And 6 more authors.
IEEE Antennas and Wireless Propagation Letters | Year: 2012

In this letter, an innovative technique is proposed to enhance the port-to-port isolation of two closely spaced dual-band radiating elements in the WLAN 2.4-2.5-GHz and 5.15-5.825-GHz frequency bands. This broadband technique consists in inserting an optimized parasitic element between the two antennas of a multiple-input-multiple-output (MIMO) set-top box. High port-to-port isolation is obtained, and the computation of the diversity performance shows suitability for enhanced diversity and MIMO applications. © 2006 IEEE.


Feil P.,University of Ulm | Zeitler A.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Nguyen T.P.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Pichot Ch.,CNRS Laboratory of Electronics, Antennas and Telecommunications | And 2 more authors.
European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Radar Conference, EuRAD 2010 | Year: 2010

This paper presents the results of FOD measurements conducted using a broadband 78 GHz radar sensor. Previous studies with a short-range setup up to 30 m showed promising results. However, to meet the requirements of the intended application, the range has to be increased significantly. As for all radar systems, the range can be extended by increasing the transmitted power and/or the antenna gain. In this work two different folded reflectarray antennas with a cosec-shaped pattern have been used to improve the system performance and range. Together with a CFAR (constant false alarm rate) algorithm and a moving target indication advances could be achieved compared to the previous setup. © 2010 EuMA.


Leca J.-P.,STMicroelectronics | Froidevaux N.,STMicroelectronics | Braquet H.,CNRS Laboratory of Electronics, Antennas and Telecommunications | Jacquemod G.,CNRS Laboratory of Electronics, Antennas and Telecommunications
Proceedings of the 8th International Workshop on Electromagnetic Compatibility of Integrated Circuits 2011, EMC COMPO 2011 | Year: 2011

This paper presents a predictive SPICE model for the radiated ElectroMagnetic Interferences (EMI) of a 32-bit microcontroller. The aim of this work is to be able to predict, during the design stage, the level of electromagnetic emissions in order to establish pinout, design or layout rules. This model is intended to represent the EMI behavior of a microcontroller when it is running in a noisy mode (reading accesses to the eNVM Flash memory and CPU running). The simulated results have then been correlated with radiated emission measurements. The model has been simulated with the Eldo simulator while the measurements have been done on a 32-bit STMicroelectronics® microcontroller, following the IEC 61967-2 standard. © 2011 Univ of Zagreb.

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