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940 documents found for International Journal
A high-power solid state amplifier for Galileo satellite system exploiting European GaN technology
Rocco Giofré, Paolo Colantonio, Elisa Cipriani, Franco Giannini, Laura Gonzalez, Francisco De Arriba, Lorena Cabria
Published online : 01-06-2016
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This paper describes the development of an L-Band (f = 1.575 GHz) high power and efficient solid state power amplifier (SSPA) designed for the European satellite navigation system (i.e. Galileo). The amplifier, developed in the framework of the European Project named SLOGAN, exploits the GH50-10 GaN technology available at United Monolithic Semiconductor foundry. The aim of the project is to offer
Array of patch-antennas with meandering-gaps on optical modulator for wireless millimeter-wave beam-steering
Yusuf Nur Wijayanto, Atsushi Kanno, Hiroshi Murata, Tetsuya Kawanishi, Naokatsu Yamamoto, Yasuyuki Okamura
Published online : 01-06-2016
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An array of patch-antennas with meandering-gaps on an optical modulator is proposed for wireless millimeter-wave beam-steering through high-speed radio-over-fiber systems. Wireless millimeter-wave can be received by the array of patch-antennas and directly modulated to lightwave by the optical modulator. The wireless millimeter-wave can be steered using the meandering-gaps at the patch-antennas by
A comprehensive comparison between GaN MMIC Doherty and combined class-AB power amplifiers for microwave radio links
Rocco Giofrè, Paolo Colantonio, Franco Giannini, Chiara Ramella, Vittorio Camarchia, Mustazar Iqbal, Marco Pirola, Roberto Quaglia
Published online : 01-06-2016
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A combined class-AB and a Doherty power amplifier conceived for microwave backhaul in the 7 GHz frequency band are here presented and compared. They are fabricated in the same GaN monolithic process and have identical total active device periphery. For the given application, the linearity-efficiency trade-off for the two architectures is discussed. The two modules have been thoroughly characterize
In-chirp FSK communication between cooperative 77-GHz radar stations integrating variable power distribution between ranging and communication system
Werner Scheiblhofer, Reinhard Feger, Andreas Haderer, Stefan Scheiblhofer, Andreas Stelzer
Published online : 01-06-2016
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We present the realization of a cooperative radar system for ranging applications with integrated data-transmission capability. The simultaneous transmission is performed by the radar-hardware without the necessity of additional components or an auxiliary data-link. Therefore, the data are directly embedded in the transmitted chirp of a frequency-modulated continuous-wave radar sensor. A second st
IJMWT special issue on the 2015 French Microwave Days
Thierry Taris, Anthony Ghiotto
Published online : 01-05-2016
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MRF volume 8 issue 3 Cover and Back matter
Thierry Taris, Anthony Ghiotto
Published online : 01-05-2016
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MRF volume 8 issue 3 Cover and Front matter
Thierry Taris, Anthony Ghiotto
Published online : 01-05-2016
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A 60 GHz passive repeater array with quasi-endfire radiation based on metal groove unit-cells
Duo Wang, Raphaël Gillard, Renaud Loison
Published online : 01-05-2016
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This paper describes a linear-polarized reflector that reflects incident wave almost parallel to its surface at 60 GHz, when illuminated by an impinging plane wave with normal incidence. This structure is designed as a simple and low-cost passive repeater with both a quasi-endfire radiation and a flat profile. Working as a transmission relay, it is a quite potential and possible solution to improv
Modeling up to 45 GHz of coupling between microvias and PCB cavities considering several boundary conditions
Thierry Le Gouguec, Najib Mahdi, Stéphane Cadiou, Cédric Quendo, Erich Schlaffer, Walter Pessl, Alain Lefevre
Published online : 01-05-2016
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The recent developments in electronic cards such as the network equipment are characterized by the miniaturization of the board size and the increasing complexity of the layout. Because of these requirements, multi-layered printed circuit boards are commonly used and vias connecting signal lines on different layers, or integrated circuit devices to power and ground planes, are frequently used and
A concurrent 915/2440 MHz RF energy harvester
Ludvine Fadel, Laurent Oyhenart, Romain Bergès, Valérie Vigneras, Thierry Taris
Published online : 01-05-2016
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This paper presents the development of two dual-band radio-frequency (RF) harvesters optimized to convert far-field RF energy to DC voltage at very low received power. The first one is based on a patch antenna and the second on a dipole antenna. They are both implemented on a standard FR4 substrate with commercially off-the-shelf devices. The two RF harvesters provide a rectified voltage of 1 V fo
A 60 GHz reconfigurable active phase shifter based on a vector modulator in 65 nm CMOS technology
Boris Moret, Nathalie Deltimple, Eric Kerhervé, Baudouin Martineau, Didier Belot
Published online : 01-05-2016
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This paper presents a 60 GHz reconfigurable active phase shifter based on a vector modulator implemented in 65 nm complementary metal?oxide?semiconductor technology. This circuit is based on the recombination of two differential paths in quadrature. The proposed vector modulator allows us to generate a phase shift between 0° and 360°. The voltage gain varies between ?13 and ?9 dB in function of th
Design and experimental characterization of a reconfigurable transmitarray with reduced focal distance
Luca Di Palma, Antonio Clemente, Laurent Dussopt, Ronan Sauleau, Patrick Potier, Philippe Pouliguen
Published online : 01-05-2016
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In this contribution, we study the design and experimental characterization of a reconfigurable transmitarray in X-band with reduced focal distance. To this end, we consider an illumination with four feed horn antennas in two different configurations. The focal distance and the horn configuration in the focal plane have been optimized with an in-house simulation tool. The effects of source placeme
High sensitivity SOA-PIN/TIA photoreceiver for 40 Gb/s applications and beyond
Philippe Angelini, Fabrice Blache, Christophe Caillaud, Michel Goix, Filipe Jorge, Karim Mekhazni, Jean-Yves Dupuy, Mohand Achouche
Published online : 01-05-2016
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This paper reports a differential photoreceiver module designed for short reach applications such as access network and data center interconnect. It consists of a monolithically integrated semi-conductor optical amplifier with a PIN photodiode and a linear transimpedance amplifier (TIA) mounted on the same carrier. A matching circuit is placed between the PIN and the TIA in order to increase the c
Pseudo-elliptic dual-band filters based on TM dual-mode cavities
Valeria Nocella, Luca Pelliccia, Hamza El Ghannudi, Cristiano Tomassoni, Roberto Sorrentino
Published online : 01-05-2016
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This paper presents possible configurations of dual band filters based on transverse magnetic (TM) Dual mode cavities. The concept is to use TM dual-mode cavities in order to design compact dual band filters. High flexibility is obtained in terms of transmission zero (TZ) positioning. By using this approach a number of TZs up to the number of poles is attainable. Zeros can be placed in both the lo
A geometry-based stochastic approach to emulate V2V communications? main propagation channel metrics
Jessen Narrainen, Philippe Besnier, Martine Gatsinzi Ibambe
Published online : 01-05-2016
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In order to evaluate a communication system, we need to model the propagation channel of the relevant environments pertaining to that communication. In this paper, we propose a Geometry-Based Stochastic Channel Modeling approach to build up propagation channel simulations to assess the performance of vehicle-to-vehicle wireless communications. Our methodology allows the simulation of dynamic scena
Noise conversion of Schottky diodes in mm-wave detectors under different nonlinear regimes: modeling and simulation versus measurement
Jéssica Gutiérrez, Kaoutar Zeljami, Enrique Villa, Beatriz Aja, Maria Luisa de la Fuente, Sergio Sancho, Juan Pablo Pascual
Published online : 01-05-2016
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This paper presents and discusses several methods for predicting the low-frequency (LF) noise at the output of a mm-wave detector. These methods are based on the extraction of LF noise source parameters from the single diode under a specific set of bias conditions and the transfer or conversion of these noise sources, under different operating conditions including cyclostationary regime, to the qu
Design methodology for a switching-mode RF CMOS power amplifier with an output transformer
Changhyun Lee, Changkun Park
Published online : 01-05-2016
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In this study, we propose a design methodology for a switching-mode RF CMOS power amplifier with an output transformer. For a given supply voltage, output power, and target efficiency, the initial values of the transistor size, output inductance, and capacitance can be sequentially determined during the design of the power amplifier. The breakdown voltage of the power transistor is considered in t
An improved stopband and sharp roll off microstrip low pass filter with defected ground structures
Agâh Oktay Ertay, Mehmet Abbak, Serkan ?im?ek
Published online : 01-05-2016
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In this paper a novel low pass filter (LPF) design procedure is proposed for electromagnetic bandgap based microstrip filters without using classical filter design approach. LPF is designed for ultra-wide stopband and sharp roll-off rate via proposed design procedure. It has been shown that finite periodic fan-shaped defected ground structures (FSDGSs) and double radial stubs (DRSs) yield broad st
Design and evaluation of a wireless CMOS energy harvester for biomedical sensor networks
Cihun-Siyong Alex Gong
Published online : 01-05-2016
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An efficient platform of wireless power delivery through a pair of coupling coils with a fully integrated complementary metal-oxide-semiconductor (CMOS) rectifier is designed and evaluated in this paper. The research is intended for inductively powered energy harvesting application of biomedical sensor network. By making use of high-performance active diodes fulfilling almost ideal switching (zero
Application of Gbest-guided artificial bee colony algorithm to passive UHF RFID tag design
Sotirios K. Goudos, Katherine Siakavara, Argiris Theopoulos, Elias E. Vafiadis, John N. Sahalos
Published online : 01-05-2016
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In this paper, new planar spiral antennas with meander lines and loads for passive Radiofrequency identification tag application at ultra-high-frequency band are designed and optimized using the global best (gbest)-guided Artificial Bee Colony (GABC) algorithm. The GABC is an improved Artificial Bee Colony algorithm, which includes gbest solution information into the search equation to improve the
Design of high efficient 3-level LINC transmitter using a 9-point finite difference method
Jonggyun Lim, Hyunchul Ku
Published online : 01-05-2016
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An efficiency of linear amplification with nonlinear components (LINC) system is degraded due to the low efficiency of a power combiner for high peak-to-average power ratio signals such as long-term evolution signal. A multi-level LINC system can be used to improve the performance of the conventional LINC system. In this paper, a novel 9-point finite difference method to determine the optimal thre
A novel wide band-gap structure for improved signal integrity
B. Appasani, N. Gupta
Published online : 01-05-2016
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In this paper, a simple and novel electromagnetic band gap (EBG) structure is proposed which offers a wide band gap and improved signal integrity. The unit cell of the structure consists of three square patches arranged in a particular fashion and connected by L-shaped bridges. Two of the square patches are shorted to the ground plane using vias. The unit-cell dimensions were taken to be less than
Digital I/Q imbalance correction for full-duplex dual-band OFDM radio transceivers
Zhaowu Zhan, Guillaume Villemaud, Florin Hutu, Jean-Marie Gorce
Published online : 01-05-2016
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This paper presents a full-duplex dual-band orthogonal frequency division duplexing (OFDM) radio architecture that enables the radio transceiver to be more flexible and provides a viable radio link capacity gain. A simple but practical I/Q imbalance estimation and compensation method, based on the frequency-flat-fading behavior of the self-interference channel, is proposed. The performance of the
X-band compact choke horn antenna with circular polarization and isoflux pattern for nanosatellite applications
Eric Arnaud, Luc Duchesne, Kevin Elis, Jamil Fouany, Thierry Monediere, Marc Thevenot
Published online : 01-05-2016
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This paper presents a tradeoff between isoflux pattern quality and X-band antenna compactness for nanosatellite applications. Having an isoflux radiation and a circular polarization (CP) generally causes a large antenna size which is incompatible for these applications. A new design of an antenna is done with the following maximum antenna dimensions: a diameter of 90 mm and a height of 20 mm above
A wideband power divider with bandpass response
Cong Tang, Xianqi Lin, Yong Fan, Kaijun Song
Published online : 01-05-2016
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In this paper, a new configuration embedded with two filters and one resistor is proposed, which has the dual function of power splitting and filtering. The filter is based on stepped impedance ring resonator. All the even- and odd-mode resonant frequencies and transmission zeroes of the stepped impedance ring resonator are derived based on the even- and odd-mode analysis. Three interdigital-coupl
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