Christian PersonIMT Atlantique, Institut Mines Telecom, Brest, France · Direction Recherche et Innovation
Christian Person
PhD
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Publications (303)
Date de dépôt : 19/03/2021N° de dépôt : FR2102785
This paper focuses on quantifying the uncertainty in the specific absorption rate valuesof the brain induced by the uncertain positions of the electroencephalography electrodes placed onthe patient’s scalp. To avoid running a large number of simulations, an artificial neural networkarchitecture for uncertainty quantification involving high-dimensio...
Les antennes spirales sont généralement utilisées en raison de leur importante bande passante pouvant atteindre la décade. Leur diamètre est cependant un inconvénient lorsqu'elle est employée en basse fréquence. Le but de cette étude est d'augmenter la bande passante de l'antenne vers les basses fréquences sans accroitre son encombrement, par l'uti...
A U-shaped antenna is printed on polytetrafluoroethylene film, deposited on a copper base having air cavity inside, using thin film micro-strip technology. This antenna is as compact as the rectangular patch and covers the 51.5–62 GHz band. Unlike the silicon substrate, its metallic support yields better radiation patterns.
Cet article présente les premiers résultats de la conception et du développement d'un capteur microonde basé sur un résonateur à stub quart d'onde. L'idée de ce travail est d'utiliser des tubes à essai standards tels que ceux utilisés au CHRU de Brest remplis d'une solution aqueuse de glucose pour en déterminer sa concentration. L'interaction entre...
Dans ce travail, un substrat papier E4D ultra fin a été caractérisé en utilisant une méthode de ligne de transmission micro-ruban pour déterminer ses propriétés diélectriques. Ensuite, une antenne monopôle Wifi bi-bande a été conçue par impression sérigraphie sur ce substrat cellulosique flexible. Les résultats de mesure sont en bon accord avec la...
One of the growing trend in antennas is to address multifunctional systems, providing direct space saving and cost reduction. A consideration for future generation antennas is to replace the classical planar geometry with new functionalities. Three-dimensional (3-D) / conformal antennas offer significant advantages for such system. However, traditi...
A dual-mode, dual-port pattern diversity antenna is presented for 2.45 GHz wireless body area networks (WBAN). This antenna provides multiple radiation patterns as desired for both on- and off-body applications namely, an omni-azimuthal radiation pattern directed along the body and a broadside radiation directed away from the body respectively. Thi...
Existing missile radar seekers use a mechanical rotating antenna to steer the radiating beam in the direction of the target. Recent research is investigating the possibility to replace the mechanical RF seeker with a novel 3D conformal antenna, embedded below the radome, that can steer the beam electronically. 3D conformal antenna arrays may offer...
This article is the first thorough study of average population exposure to third generation network (3G)-induced electromagnetic fields (EMFs), from both uplink and downlink radio emissions in different countries, geographical areas, and for different wireless device usages. Indeed, previous publications in the framework of exposure to EMFs general...
In this work, an electromagnetic characterization method using microstrip transmission lines to determine the dielectric properties of flexible substrates, such as papers or PET (Polyethylene Terephthalate), is proposed. Various metallization technologies (adhesive copper tape, screen printing, etched aluminum layer) have been tested to fabricate m...
In this paper, an uniplanar log-periodic antenna with a perpendicular plane reflector dedicated to a radio wave camera system is presented. The performance of this antenna are investigated over a wide frequency range, comparing between measured and simulated results. The measured return loss of the
antenna exhibits a wideband performance between 1....
Dans cet article, une rectenna large bande de 1.8 à 2.6 GHz a été conçue pour récupérer l’énergie RF
présente dans l’environnement de capteurs sans fil. Il est montré grâce à des simulations confirmées par des mesures, qu’en présence de trois sources radiofréquences, chacune émettant à 10 dBm,
l’efficacité de conversion RF-dc est supérieure de 10...
The present invention relates to an underwater radio frequency antenna able to radiate in an underwater or equivalent propagation medium. It comprises -a hollow conducting tube (1) forming a resonant cavity, said conducting tube having an open end and a closed end,-means of excitation (2) of said resonant cavity which are able to be fed with signal...
The aim of this paper is to show the possibility to harvest RF energy to supply wireless sensor networks in an outdoor environment. In those conditions, the number of existing RF bands is unpredictable. The RF circuit has to harvest all the potential RF energy present and cannot be designed for a single RF tone. In this paper, the designed RF harve...
Nowadays wireless communications are used almost everywhere and play a significant role in people's daily life. Paradoxically, as the use of all kinds of wireless communications expanded, the public concern about the exposure induced by radiofrequency (RF) electromagnetic fields (EMF) increased.
Co-designed Low Noise Amplifier (LNA) and dipole antenna in a RadioFrequency (RF) dedicated silicon technology, BÌCMOS9MW, are presented in this paper. The LNA is a two-stages cascode based on a SiGE:C 130 nm HBT optimized for maximum gain. The antenna is a dipole designed to match the LNA input impedance and maximize radiation diagram. Both are co...
Distribution fitting for real-time off-body channel measurements is presented for narrowband ISM 2.45 GHz applications. The measured data statistics are compared with standard distribution functions such as normal, lognormal, etc. However, for real-time multipath channel measurements, the diversity of empirical data depending on the studied configu...
In this paper, a 1.8 GHz to 2.6 GHz wideband rectenna is designed for Radio Frequency (RF) energy harvesting in the context of Wireless Sensor Nodes (WSN). To assess the feasibility of ambient RF energy harvesting, the power density from RF base stations is analysed through statistical measurements. Power density measurements are also performed clo...
In this paper, off-body channel measurements are proposed using miniaturized chip antennas (dimension: 7 × 2 × 1.20 mm3) under pattern diversity configuration at 2.2-2.3 GHz. The measurements were carried out in a multipath indoor laboratory environment using two sensors as transmitter and receiver deployed on-body and free-space, respectively wher...
Energy-efficient cell breathing is a mechanism that consists of adapting cell sizes and number of active Base Stations (BS) to the distribution and current levels of traffic. In this article, our goal is to analyse the effect of such a technique on the electromagnetic (EM) radiation levels for mobile phone devices. Although there exist large detail...
A general design of the coplanar waveguide excited IIFA, traditionally excited by a Microstrip or coaxial excitation is presented. This coplanar excitation permits the bandwidth improvement (from around 10% to 50%) by the creation of a new resonance on the ground plane. It makes also the antenna more suitable to body area network (BAN) context by f...
In this paper, an improved technique is presented to enhance Terahertz (THz) and Millimeter Wave (MMW) On-Chip antenna performance on low-resistive silicon substrates using High-Impedance Surfaces (HIS). These surfaces are directly printed onto the metal layers of ST Microelectronics' BiCMOS 55 nm technology Back End Of Line (BEOL) and do not requi...
A wide-band 900 MHz to 2.45 GHz rectenna has been developed for Radio Frequency (RF) energy harvesting in the context of outdoors Wireless Sensor Nodes (WSN). Based on simulations of different rectifying circuits, the most appropriate one for low incident power levels has been manufactured and tested with a wide-band antenna. The theoretical analys...
In this paper, we propose the design of low-cost highly integrated microwave filters for future wireless homenetworks. In this work, microwave filters for dual concurrent WiFi communications have been designed using low-cost planar technologies. These designs have been further improved in terms of performances, more particularly in term of selectiv...
An advanced feed for a mm-wave short-range exposure system is reported. The feed configuration is optimized to provide a highly-uniform illumination of biological samples positioned close to the antenna aperture. The prototype of the antenna is fabricated in metallized foam and measured. Its near-field characteristics are studied using the infrared...
The purpose of this paper is to study the effects on electromagnetic field levels of the green cell breathing technique in mobile networks. Although a great number of papers dedicated to QoS, radio issues and energy savings of the cell breathing algorithms have already been proposed, to the best of our knowledge, none has analyzed the effect on ele...
An innovative LDS 4G antenna solution operating in the 698-960 MHz band is presented. It is composed of two radiating elements recombined in a single feed broadband antenna system using a diplexer. This circuit is realized thanks to lumped components, assembled directly on the plastic piece which supports the antenna. Corresponding measurements sho...
Résumé La théorie des modes caractéristiques est appliquée à la conception d'antennes à résonateur diélectrique (DRA). Elle permet d'aboutir à un dimensionnement optimal du résonateur par l'identification et l'analyse des modes résonants sans la partie excitation. Ainsi, il est possible d'optimiser le type rayonnement (radial, axial,…) et la bande...
Dans cette étude, une comparaison entre deux sources d’énergie envisageables pour la récupération
d’énergie ambiante pour des applications Body Sensor Area Networks (BSAN) est proposée. L’énergie des ondes électromagnétiques est comparée à l’énergie photovoltaïque à l’aide de mesures. Bien que la récupération d’énergie photovoltaïque ait un facteu...
A multi-sensor test-bench for determining the SAR (specific absorption rate) due to wireless devices emitting in equivalent human tissues is presented. Real-time SAR assessment is proposed considering a spatially distributed multiprobe test-bench. In comparison with a multi-axial robot SAR system, the proposed one does not require any displacement,...
A Dielectric Resonator Antenna (DRA) for a System in Package (SiP) millimeter wave transmitter is proposed. A commercially available Quad-Flat No-leads (QFN) package is chosen and the DRA is designed taking into account the package environment. The final design shows a 14% impedance bandwidth (56.5 GHz - 65 GHz @VSWR=2) with a maximum realized gain...
An innovative LDS 4G antenna solution operating in the 698-960 MHz band is presented. It is composed of two radiating elements recombined in a broadband single feed antenna system using a multiband matching circuit design. Matching interfaces are synthesized thanks to lumped components placed on the FR4 PCB supporting the LDS antenna. Measurement s...
Performance of a System in-Package (SiP) module is evaluated in this paper. The solution consists of a Dielectric Resonator Antenna (DRA) excited by a Power Amplifier (PA). The impact of the bond wire and the closed proximity of the PA element have been considered in the simulation for the co-design of this highly integrated sub-system. Experimenta...
This brief presents the codesign of a W-band power amplifier (PA) with a dipole antenna using a 0.13-μm SiGe bipolar complementary metal oxide semiconductor (BiCMOS) process. The codesign allows the direct interconnection between the PA and the transmitter (Tx) antenna, suppressing the matching network between the two blocks and contributing to los...
In order to counteract the antenna impedance mismatch due to its interaction with the environment, one solution is to add an antenna tuner between the front-end module and the antenna. In this paper, we present the large signal measurement of a 4G integrated antenna tuner, previously presented in [1]. The tuner has been realized in STMicroelectroni...
This paper presents the design and the entire experimental characterization of a superdirective antenna array. The antenna system is composed of two closely spaced bow-tie monopoles fed by a power divider associated to a Matching Network (MN) and a Decoupling Network (DN). Given the high accuracy required for achieving superdirectivity in terms of...
A new rectangular spiral Bi-band coplanar antenna for off-body communications is presented. This antenna covers two ISM bands, SRD/868 (868-870 MHz) and ISM/2450 (2.4-2.5 GHz). It is considered as electrically small at the lower band, thanks to the specific shape selected. The weak influence of the body on antenna characteristics is described over...
A lens-corrected smooth-walled axis-symmetrical
dielectric-loaded horn antenna is designed and characterized
in Ka-band using the bodies of revolution finite-difference time
domain (BoR-FDTD) technique and genetic algorithm. The joint
optimization of the horn and dielectric loading profiles enables
us to develop a horn with a very good gain perform...
In this paper, an innovative 4G antenna solution operating in the 698-960 MHz band, is presented. It is composed of two radiating elements recombined in a single feed antenna-system using an integrated power divider/combiner, synthesized thanks to five lumped components. Simulations using realistic SMD (Surface Mount Devices) components allow reach...
This paper describes a new broadband microstrip to coplanar strip (CPS) line transition, where supporting substrates are joined perpendicularly, one containing the CPS line and the other one the microstrip line. The CPS line is coupled to the microstrip line through a symmetric slot radial stub placed in the ground plane of the microstrip line subs...
In this paper, a completely packaged solution is presented for high data rate radio front end operating around 60 GHz. A cylindrical dielectric resonator antenna is micromachined as a part of the package surrounding other active elements. This resonator is magnetically coupled to a nearby integrated coplanar-fed slotted dipole. Simulation results s...
This paper describes a tunable matching network, fully integrated in STMicroelectronics 130 nm CMOS SOI technology. It is able to correct, on the 2500-2690 MHz band, the antenna mismatch of a cellular phone due to the user interaction (for example the hand impact):any VSWR of 5:1 can be reduced to a value lower than 2:1.
Full Paper — This paper presents a novel method for co-designing filters and antennas. Commonly, the filter and the antenna are separately designed, which usually induces reduced performances in terms of energy efficiency (due to losses) and dimensions. We propose first to model the antenna as the last low to medium Q-factor filter resonator. Then,...
Two bi-access stacked patch antennas for opportunistic applications are presented. The first antenna has the same band 1.785-2.2 GHz (PCS, UMTS) on the two ports with polarization diversity. The second antenna has two bands. In this case the first port covers 1.84-2.2 GHz band (PCS, UMTS). The second port covers 2.23-2.72 GHz band (WLAN). The innov...
A novel, broadband (15 GHz) and high gain (6 dBi) antenna incorporated in package for the 60 GHz band is presented. This solution avoids separated process for antenna and the package. By the use of laser micromachining possibilities, the antenna-package element has been fabricated with alumina. The antenna is based on a dielectric resonator (DR) th...
An antenna structure is presented for the front end of the 60Ghz transmitter. The solution takes into account the presence of the silicon chip that comprises the silicon-based transceiver and the interconnections between the transceiver, the antenna and the printed Circuit Board (PCB) for assembling and mounting operations. A 4.7-GHz bandwidth (@VS...
A new tri-access tri-band reconfigurable stacked patch wire plate antenna is presented. This antenna has three excitation ports and two operation states. In a first state, the antenna works as a bi-access wide band stacked patch. In this case the first port covers 1.84-2.2 GHz band (PCS, UMTS). The second port covers 2.23-2.72 GHz band (WLAN). In a...
This paper presents an original method for the analytical computation of a non-rectangular patch antenna input impedance, with more or less regular shapes (polygon, trapezoid...). The method is based on a modal analysis of the equivalent cavity. Based upon classical patch impedance equations deduced from the transmission line model (circuit model),...
A multi-sensors test-bench for SAR assessment is presented in this paper. The innovation lies on the possibility of immediate SAR measurement without any displacement and mechanical movement, in comparison with standard SAR test-bench with multi-axial robot. Calibration procedure then appears a quite critical due to the huge number of sensors consi...
Silicon technologies are now competitive with III-V components for applications in the millimeter wave frequencies range, as already demonstrated through fully integrated on-chip systems [1]-[6]. We discuss in this paper of the different thinkable alternative solutions to fully implement efficient antennas within Silicon environment, exploiting eit...
Several smooth-walled axis-symmetrical dielectric-loaded horn antennas with large flare angles have been designed and characterized in Ka-band. They have been optimized using an in-house CAD tool based on the BoR-FDTD technique and genetic algorithms. Two antenna configurations have been compared: in the first case, only the metallic profile of the...
A new design method for multi-access antennas is presented. This method is based on a modal analysis assuming the microstrip antennas as a resonant cavity. Using this cavity approach, the eigenmodes perturbation induced by the cavity deformation (adding slots or short circuits) is studied. As an application, a solution of multi-access antenna with...
In order to counteract antenna impedance mismatch due to interaction with environment, one solution is to use a tuner between the front end module and the antenna. In this paper, a 4G antenna tuner integrated in STMicroelectronics 130 nm CMOS SOI technology and operating between 2500 MHz and 2690 MHz is described. Thanks to high power CMOS SOI Digi...
A new dielectric resonator antenna (DRA) solution for the complete integration of radio front end at 60GHz is presented. The solution is a SoC configuration consisting of an integrated PA and a CPW fed slot on 65nm CMOS SOI (Silicon on Insulator) technology from ST Microelectronics. A co-design strategy is taken into consideration to reduce the siz...
This paper presents the design of a packaged antenna including glass substrate. A square patch antenna is implemented on glass substrate exploiting IPD™ technology, and excited by a coupling slot implemented on BiCMOS B9MW technology (Low Resistivity (LR) Si - ρ = 12 Ω.cm). The described solution solves the interconnection problem between Silicon I...