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940 documents found for International Journal
The organization of Microwave Engineering by professional institutions in Europe, in the second half of the 20th century
André Vander Vorst
Published online : 01-09-2016
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The purpose of this paper is twofold. It first describes how Microwaves were progressively organized by Professional Engineering Institutions in Europe in the years 1960?2000, essentially through individual efforts over many years. The first formal Microwave event organized in Europe was the European Microwave Conference in London, 1969, opening a series that continues as the European Microwave We
Gain enhancement of microstrip patch antenna using Sierpinski fractal-shaped EBG
Neeraj Rao, Dinesh Kumar Vishwakarma
Published online : 01-09-2016
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This is the first report on novel mushroom-type electromagnetic band gap (EBG) structures, consisting of fractal periodic elements, used for enhancing the gain of microstrip patch antennas. Using CST Microwave studio the performance of rectangular patch antenna has been examined on proposed fractal EBG substrates. It is found that fractal EBGs are more effective in suppressing surface wave thus re
Variation effect of plane-wave incidence on multiconductor transmission lines
Youssef Mejdoub, Hicham Rouijaa, Abdelilah Ghammaz
Published online : 01-09-2016
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This paper addresses the study of the variation effects of incident plane wave on a multiconductor transmission line (MTL), using a coupling circuit model of MTL line with plane wave based on the method of characteristics (Branin method). This model is valid in the time and frequency domains. It has also an advantage of not presupposing the conditions of the charges applied to its ends, which allo
Design of angular and polarization stable modified circular ring frequency selective surface for satellite communication system
Garima Bharti, Kumud Ranjan Jha, Ghanshyam Singh, Rajeev Jyoti
Published online : 01-09-2016
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In this paper, a simple synthesis technique to obtain the geometrical parameters of the modified circular ring for angular and polarizations (perpendicular and parallel) stable frequency selective surface (FSS) has been discussed. The geometrical parameters of the modified circular ring FSS structure have been achieved using the proposed synthesis technique, which is based on the equivalent circui
Circularly polarized beam-steering antenna array with enhanced characteristics using UCEBG structure
Tohid Aribi, Mohammad Naser-Moghadasi, R. A. Sadeghzadeh
Published online : 01-09-2016
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A broadband circularly polarized (CP) beam-steering antenna array is presented. CP antenna is composed of four identical CP slot elements with 2 × 2 configuration and a 4 × 4 feeding network. CP slot element is utilized in array form to improve impedance bandwidth and sequentially rotation method is used to increase axial-ratio bandwidth. Moreover, uni-planer compact electromagnetic band-gap struc
Triple band circularly polarized compact microstrip antenna with defected ground structure for wireless applications
Mukesh Kumar Khandelwal, Binod Kumar Kanaujia, Santanu Dwari, Sachin Kumar, Anil Kumar Gautam
Published online : 01-09-2016
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Asymmetric slits loaded irregular shaped microstrip patch antenna with three different ground structures is proposed. All three antennas show triple band characteristics. First antenna with regular ground plane resonates at 1.95, 2.4, and 4.90 GHz with good radiation characteristics and shows right-hand circular polarization at 1.95 GHz. 18.75% of compactness is achieved with triple band character
Semi Spiral G-shaped dual wideband Microstrip Antenna with Aperture feeding for WLAN/WiMAX/U-NII band applications
Amanpreet Kaur
Published online : 01-09-2016
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In this paper, a dual wideband microstrip antenna (MSA) has been presented for wireless local area networks (WLAN), worldwide interoperability for microwave access (Wi MaX) and U-NII band applications. The antenna is designed and simulated using CSTMWS V'10. The main goal of this paper is to get multi-frequency behavior by cutting resonant slots into the patch of the antenna and a wideband antenna
Design and parametric analysis of a planar array antenna for circular polarization
Muhammad Asad Rahman, Quazi Delwar Hossain, Md. Azad Hossain, Eisuke Nishiyama, Ichihiko Toyoda
Published online : 01-09-2016
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A new circularly polarized planar array antenna using linearly polarized microstrip patches is designed and optimized for X-band wireless communication applications. Four square patch elements with feed network are used to design the circularly polarized array antenna. The feed network consists of microstrip lines on the obverse side of the dielectric substrate and slot line on the reverse side of
MRF volume 8 issue 4-5 Cover and Back matter
Denis Barataud, Éric Tournier, Michèle Lalande
Published online : 01-07-2016
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MRF volume 8 issue 4-5 Cover and Front matter
Denis Barataud, Éric Tournier, Michèle Lalande
Published online : 01-07-2016
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EuMW 2015 Special Issue
Denis Barataud, Éric Tournier, Michèle Lalande
Published online : 01-07-2016
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UWB impulse radiation source with integrated optoelectronic generator
Romain Négrier, Michèle Lalande, Valérie Bertrand, Joël Andrieu, Vincent Couderc, Badr M. Shalaby, Laurent Pecastaing, Antoine De Ferron, Laurent Desrumaux
Published online : 01-06-2016
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This paper presents an innovative design of an Ultra Wide-Band (UWB) impulse radiation source. The transmitting system is composed of an UWB antenna with an integrated optoelectronic generator, which is able to feed the system with appropriate waveforms, a pulsed high voltage source, and an optical command system. The radiation source is the elementary part of a forthcoming short-range UWB Radar w
Automated design of balanced wideband bandpass filters based on mirrored stepped impedance resonators (SIRs) and interdigital capacitors
Marc Sans, Jordi Selga, Paris Vélez, Ana Rodríguez, Jordi Bonache, Vicente E. Boria, Ferran Martín
Published online : 01-06-2016
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This paper presents small balanced bandpass filters exhibiting wide differential-mode pass bands and high common-mode suppression. The filters are implemented in microstrip technology and their topology consists of multisection mirrored stepped impedance resonators (SIRs) alternating with mirrored interdigital capacitors. The mirrored SIRs provide the required common-mode transmission zeros to ach
On the development of a novel high VSWR programmable impedance tuner
Arnaud Curutchet, Anthony Ghiotto, Manuel Potéreau, Magali De Matos, Sébastien Fregonese, Eric Kerhervé, Thomas Zimmer
Published online : 01-06-2016
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Impedance tuners are key instruments used for load- and source?pull measurements. They are crucial for any active microwave components, circuits, and systems characterization and optimization. This paper reports theoretical, simulated, and experimental results related to the development of a novel programmable impedance tuner offering high-voltage standing wave ratio (VSWR). After presenting the p
Robust and fast near-field antenna measurement technique
Po-Jui Chiu, Wei-Chung Cheng, Dong-Chen Tsai, Zuo-Min Tsai
Published online : 01-06-2016
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Traditional near-field antenna measurements use the sampling theorem to reconstruct the antenna pattern perfectly. However, a large number of measurement points are required for this approach. To address this problem, in this study, we propose a technique to accelerate the near-field antenna measurement, which is achieved by sparse E-field sampling in the region where the E-field changes smoothly
Wire-medium loaded planar structures: modal analysis, near fields, and radiation features
Davide Comite, Paolo Baccarelli, Paolo Burghignoli, Alessandro Galli
Published online : 01-06-2016
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A novel transmission-line model is used for the analysis of planar structures, including wire-medium (WM) slabs with vertically aligned wires. The network formalism allows for an effective determination of the relevant spectral Green's functions, of the modal dispersion equation via transverse resonance, as well as of the far-field radiation pattern produced by simple sources via reciprocity, as o
Substrate-integrated waveguide filters based on mushroom-shaped resonators
Cristiano Tomassoni, Lorenzo Silvestri, Maurizio Bozzi, Luca Perregrini
Published online : 01-06-2016
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This paper presents a new class of quasi-elliptic pass-band filters in substrate-integrated waveguide technology, which exhibits compact size and modular geometry. These filters are based on mushroom-shaped metallic resonators, and they can be easily implemented using a standard dual-layer printed circuit board manufacturing process. The presented filters exploit non-resonating modes to obtain cou
K-band MEMS-based frequency adjustable waveguide filters for mobile back-hauling
Luca Pelliccia, Paola Farinelli, Roberto Sorrentino, Giandomenico Cannone, Giulio Favre, Piero Coassini
Published online : 01-06-2016
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This paper presents the first experimental results of a novel MEMS-based waveguide filter for mobile back-hauling at K-band with adjustable center frequency. The tuning concept employs commercial packaged RF MEMS switches, wire-bonded within a rectangular cavity. The switches are used to perturb the current distribution of the TE101 mode so as to tune the resonant frequency of the cavity. A tuning
An envelope tracking RF power amplifier with capacitive charge pump modulator
Gavin Tomas Watkins, Konstantinos Mimis
Published online : 01-06-2016
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An envelope tracking (ET) radio frequency (RF) power amplifier (PA) is described intended for handsets and applications where a large number of PAs are needed. Instead of the usual split frequency architecture, a linear tracking charge pump structure is proposed. This allows the supply voltage of an RF PA to increase during the peaks of a high peak-to-average power ratio signal. When combined with
Drain current transient and low-frequency dispersion characterizations in AlGaN/GaN HEMTs
Agostino Benvegnù, Davide Bisi, Sylvain Laurent, Matteo Meneghini, Gaudenzio Meneghesso, Denis Barataud, Enrico Zanoni, Raymond Quere
Published online : 01-06-2016
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This paper presents a detailed trap investigation based on combined pulsed I/V measurements, drain current transient (DCT) measurements and low-frequency dispersion measurements of transconductance (LF Y) and output conductance (LF Y). DCT characterization is carried out over a 7-decade time scale. LF Y and Y measurements are carried out over the frequency range from 100 Hz to 1 GHz. These combine
High-performance MIMO imaging radar with hybrid transmit and receive arrays
M. Nhat Pham, Arne F. Jacob
Published online : 01-06-2016
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In this study, a sparse multiple-input multiple-output radar system with difference co-array processing is presented. It consists of two non-uniform transmitter arrays in split configuration and a symmetrical hybrid receiver array. A combination of a periodically thinned array and two non-uniform sub-arrays is used to construct the receiver structure. A low-cost three-step optimization procedure i
The influence of street furniture, tree trunks, and traffic in urban scenarios on ray tracing simulations in the millimeter wave band
Bari? Göktepe, Michael Peter, Richard J. Weiler, Wilhelm Keusgen
Published online : 01-06-2016
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In this paper, the influence of tree trunks, cylindrical street furniture such as lamp posts, and traffic on ray tracing simulations in an urban scenario is analyzed. Tree trunks and lamp posts are modeled by cylinders and propagation characteristics computed according to the Uniform Theory of Diffraction. The influence of traffic is analyzed by simulations with moving vehicles. In order to get an
80-GHz-band low-power sub-harmonic mixer IC with a bottom-LO-configuration in 130-nm SiGe BiCMOS
Xin Yang, Xiao Xu, Takayuki Shibata, Toshihiko Yoshimasu
Published online : 01-06-2016
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In this paper, a W-band (80 GHz) sub-harmonic mixer (SHM) IC is designed, fabricated and measured in 130-nm SiGe BiCMOS technology. The presented SHM IC makes use of a common emitter common collector transistor pair structure with a bottom-LO-configuration to decrease the LO power requirement and a tail current source to flatten the conversion gain. On-chip Marchand balun is designed for W-band on
SIW antennas as hybrid energy harvesting and power management platforms for the internet of things
Olivier Caytan, Sam Lemey, Sam Agneessens, Hendrik Rogier
Published online : 01-06-2016
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A novel antenna-harvester co-design paradigm is presented for wireless nodes operating in an Internet of Things context. The strategy leads to compact and highly-integrated units, which are able to set up a reliable and energy-efficient wireless communication link, and to simultaneously harvest energy from up to three different sources, including thermal body energy, solar, and artificial light. T
Passive compression technique applied to UWB beamforming and imaging architectures
Thomas Fromenteze, Ettien L. Kpré, Cyril Decroze, David Carsenat
Published online : 01-06-2016
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Recent works have demonstrated the feasibility of microwave imaging using compressive techniques, exempting the use of active delay lines, phase shifters, or moving parts to achieve beamforming. With this method, waves are coded in a passive way by a compressive device to reduce the complexity of the transmitter and/or receiver chains of the telecommunication and radar systems requiring beamsteeri
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