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1461 documents found for International Journal
SIW resonator fed horn mounted compact DRA with enhanced gain for multiband applications
Pramod Kumar, Jitendra Kumar, Shailendra Singh, Utkarsh, Santanu Dwari
Published online : 01-10-2019
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A novel design of compact and light-weight horn mounted cylindrical dielectric resonator antenna (CDRA) fed by substrate integrated waveguide (SIW) resonator has been investigated for high gain and multiband applications. SIW resonator contains two closely spaced longitudinal slots of equal length and unequal width to excite the CDRA. These slots are responsible for introducing triple resonating b
Wideband out-of-phase power dividers with improved isolation performance
Kaijun Song, Fei Xia, Yuxuan Chen, Yu Zhu, Jiawei Li, Yong Fan
Published online : 01-10-2019
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A compact wideband out-of-phase power divider (PD) with improved isolation performance is proposed. This divider is formed by connecting an additional stub for isolation to output ports of a traditional Marchand balun with a defected ground structure (DGS) been used. To verify the design, a prototype divider is fabricated and tested. The measured results validate the 53.86% band-width centered at
A new method for path-loss modeling
Qiang Li, Hongxin Zhang, Yang Lu, Tianyi Zheng, Yinghua Lv
Published online : 01-10-2019
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In this paper, a new path-loss model for electromagnetic wave in an indoor multipath environment is proposed based on matching coefficient, polarization matching factor, and normalized field intensity direction function. This model is called the Friis-extension (Friis-EXT) model, because it operates as the Friis model under certain conditions. In addition, in the modeling process of the path-loss
Compact bandpass-filtering response power divider with high-frequency selectivity and high isolation
Jiawei Li, Kaijun Song, Fei Xia, Shema Richard Patience, Song Guo, Maoyu Fan
Published online : 01-10-2019
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A compact high-isolation power divider with bandpass response and high-frequency selectivity is presented in this letter. Two dual-mode resonators are used to realize filtering response. The circuit size of the proposed power divider can be reduced by using dual-mode capacitance loaded square meander loop resonators. Due to capacitive load, the resonator can exhibit slow-wave characteristics, whic
Recent challenges and advances in microwave and radar techniques ? MIKON 2018 special issue
Konrad Jedrzejewski, Frank Weinmann
Published online : 01-09-2019
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MRF volume 11 issue 7 Cover and Back matter
Krzysztof Kulpa, Frank Weinmann, Vicente E. Boria, Teresa Martín, Mateo Burgos
Published online : 01-09-2019
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MRF volume 11 issue 7 Cover and Front matter
Krzysztof Kulpa, Frank Weinmann, Vicente E. Boria, Teresa Martín, Mateo Burgos
Published online : 01-09-2019
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Modifications of active phased antenna arrays near-field diagnosis method based on compressive sensing
Grigory Kuznetsov, Vladimir Temchenko, Maxim Miloserdov, Dmitry Voskresenskiy
Published online : 01-09-2019
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This paper presents two modifications of compressive sensing (CS)-based approach applied to the near-field diagnosis of active phased arrays. CS-based antenna array diagnosis allows a significant reduction of measurement time, which is crucial for the characterization of electrically large active antenna arrays, e.g. used in synthetic aperture radar. However, practical implementation of this metho
Evaluation of a robust correlation-based true-speed-over-ground measurement system employing a FMCW radar
Torsten Reissland, Bjoern Lenhart, Johann Lichtblau, Michael Sporer, Robert Weigel, Alexander Koelpin
Published online : 01-09-2019
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This paper presents a novel approach for the determination of True-Speed-Over-Ground for trains. Speed determination is accomplished by correlating the received signals of two side-looking radar sensors. The theoretically achievable precision is derived. Test measurements are done in two different scenarios to give a proof of concept. Thereafter a series of field measurements is performed to rate
A SiGe transceiver chipset for automotive radar applications using wideband modulation sequences
Jan Schoepfel, Simon Kueppers, Klaus Aufinger, Nils Pohl
Published online : 01-09-2019
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This paper presents a W-band MIMO radar transceiver chipset for automotive applications, based on a Silicon Germanium technology. It consists of a reference VCO, operating at a center frequency of 38 GHz and a companion IC that comprises a complete millimeter-wave transceiver at 76 GHz. This chipset enables building multipurpose MIMO radar systems that can be scaled in terms of transmitter and rec
Toward 3D passive radar exploiting DVB-T2 transmitters of opportunity
Aleksey Barkhatov, Evgenii Vorobev, Vladimir Veremyev, Vladimir Kutuzov
Published online : 01-09-2019
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This article presents the configuration and technical specification of the passive radar exploiting third-party transmitters of second-generation digital video broadcasting standard DVB-T2 as illuminators of opportunity. The performance of the two-dimensional (2D) passive radar estimated based on theoretical and experimental study is described. The possible configuration of the 2D non-equidistant
Large-signal vector characterization of LDMOS devices for analysis and design of broadband Doherty high-power amplifiers
Alessandro Cidronali, Giovanni Collodi
Published online : 01-09-2019
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We present a novel broadband large-signal vector characterization technique, suitable for high-power broadband Doherty amplifiers (DPAs). It consists of characterizing the DPA three-port sub-circuit composed of the main and peak power devices that are inter-connected by the input network. We discuss a suitable way to extract the three-port -parameters of a DPA sub-circuit, which is based on a pair
Impact evaluation of DC operating condition on DPD linearizability and power efficiency in GaN-based power amplifiers
Konrad Jedrzejewski, Dawid W. Roso?owski, Wojciech Wojtasiak
Published online : 01-09-2019
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The paper presents the results of studies on the effect of transistor DC operating conditions on GaN power amplifiers? (PAs) power efficiency and linearity improved by digital predistortion (DPD). The single-ended 10 W (ISM2.45 GHz) and 150 W (3.4/3.6 GHz) GaN HEMT PAs excited by wideband LTE20 E-TM1.1 signal were tested. To check the applicability of the small-signal approach for designing of LTE
Low loss, fully-printed, ferroelectric varactors for high-power impedance matching at low ISM band frequency
Daniel Kienemund, Nicole Bohn, Thomas Fink, Mike Abrecht, Walter Bigler, Joachim R. Binder, Rolf Jakoby, Holger Maune
Published online : 01-09-2019
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Low loss, ferroelectric, fully-printed varactors for high-power matching applications are presented. Piezoelectric-induced acoustic resonances reduce the power handling capabilities of these varactors by lowering the -factor at the operational frequency of 13.56 MHz. Here, a quality factor of maximum 142 is achieved with an interference-based acoustic suppression approach utilizing double metal?in
ISM 2.45 GHz band high-efficient 15 W GaN HEMT power amplifier: design validation
Marcin Góralczyk, Wojciech Wojtasiak
Published online : 01-09-2019
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This paper describes the development of a power amplifier operating over a 2.4?2.5 GHz frequency range with the output power level more than 15 W and 60% PAE. The transistor applied was the 10 W (13 W ) power GaN HEMT (CGH40010F from Wolfspeed) recommended up to 6 GHz. A harmonic tuning method was used to achieve even 30% more output power than the CGH40010 transistor was specified to deliver whil
Push?pull configuration of high-power MOSFETs for generation of nanosecond pulses for electropermeabilization of cells
I. W. Davies, C. Merla, A. Casciati, M. Tanori, A. Zambotti, M. Mancuso, J. Bishop, M. White, C. Palego, C. P. Hancock
Published online : 01-09-2019
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A power MOSFET-based push?pull configuration nanosecond-pulse generator has been designed, constructed, and characterized to permeabilize cells for biological and medical applications. The generator can deliver pulses with durations ranging from 80 ns up to 1 s and pulse amplitudes up to 1.4 kV. The unit has been tested for experiments on a medulloblastoma cell line. Following the exposure of cel
Verifying a concept of adaptive communication with LEO satellites using SDR-based simulations
S. Koz?owski, K. Kurek, J. Skarzy?ski, K. Szczygielska, M. Darmetko
Published online : 01-09-2019
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The paper is related to an adaptive satellite communication system for data transmission from small, low cost, low Earth orbit satellites. Tests run in a set-up consisting of a number of software-defined radio (SDR) modules operating as a satellite, a ground station, and a satellite channel simulator, have shown that by changing modulation scheme and code rate one can obtain increase of amount of
Design and modeling of an ultra-wideband low-noise distributed amplifier in InP DHBT technology
T. Shivan, E. Kaule, M. Hossain, R. Doerner, T. Johansen, D. Stoppel, S. Boppel, W. Heinrich, V. Krozer, M. Rudolph
Published online : 01-09-2019
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This paper reports on an ultra-wideband low-noise distributed amplifier (LNDA) in a transferred-substrate InP double heterojunction bipolar transistor (DHBT) technology which exhibits a uniform low-noise characteristic over a large frequency range. To obtain very high bandwidth, a distributed architecture has been chosen with cascode unit gain cells. Each unit cell consists of two cascode-connecte
Design and characterization of a 6?18 GHz GaN on SiC high-power amplifier MMIC for electronic warfare
Eduardo Oreja Gigorro, Emilio Delgado Pascual, Juan José Sánchez Martínez, María Luz Gil Heras, Virginia Bueno Fernández, Antonio Bódalo Márquez, Jesús Grajal
Published online : 01-09-2019
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A 6?18 GHz high-power amplifier (HPA) design in GaN on SiC technology is presented. This power amplifier consists of a two-stage corporate amplifier with two and four transistors, respectively. It has been fabricated on UMS using their 0.25 µm gate length process, GH25. A study of the suitable attachment method and measurement on wafer and on jig are detailed. This HPA exhibits an averaged output
Novel DC-biasing circuits with arbitrary harmonics-control capability for compact high-efficiency power amplifiers
Shinichi Tanaka, Tomoya Oda, Kento Saiki
Published online : 01-09-2019
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The next generation mobile communication systems impose challenging performance, size, and cost requirements on the power amplifiers (PAs). This paper presents novel DC-biasing circuits, which are compact and yet can control the harmonics almost arbitrarily. The proposed circuit consists of a composite right-/left-handed (CRLH) transmission line (TL) stub, of which the size and harmonics-control f
Highly compact GaN-based all-digital transmitter chain including SPDT T/Rx switch for massive MIMO applications
Florian Hühn, Andreas Wentzel, Wolfgang Heinrich
Published online : 01-09-2019
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This paper presents a fully digital transmitter chain from baseband to antenna, including a modulator, two truly digital (i.e. fully switched) microwave power amplifiers and a transmit/receive switch. Both, amplifier and switch monolithic microwave integrated circuits were implemented in a GaN HEMT process. The novel amplifier design provides greatly reduced complexity, needing only three voltage
TDOA estimation using a pair of synchronized anchor nodes
Vitomir Djaja-Josko, Jerzy Kolakowski, Jozef Modelski
Published online : 01-09-2019
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Nowadays, as indoor localization is getting more popular, there is a growing need for reliable and accurate techniques of position determination. Recently, ultrawideband (UWB)-based systems are gaining popularity, since they make achieving positioning errors in the range of dozens of centimeters or even single centimeters, possible. The Time Difference of Arrival (TDOA)-based systems are especiall
Circular polarization realization in array antennas by a modified sequential phase feeding mechanism of linearly polarized elements
A. Haghshenas, CH. Ghobadi, J. Nourinia, M. Majidzadeh, S. Mohammadi-Asl
Published online : 01-09-2019
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Novel designs of a circularly polarized 2 × 2 and 4 × 4 slot array antennas (CPSAAs) are proposed. Sequential phase feed network composed of a section of 270° and four strips is utilized to feed the array structures. Array elements are simple linearly polarized wide slot antennas (WSAs) composed of simple radiating patches with truncation on four corners and slotted ground plane on substrate backs
Low-profile, extremely wideband, dual-band-notched MIMO antenna for UWB applications
Ankan Bhattacharya, Bappadittya Roy, Rafael F. S. Caldeirinha, Anup K. Bhattacharjee
Published online : 01-09-2019
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In this article, an extremely wideband, isolation-enhanced, low-profile ?Multiple-Input-Multiple-Output? (MIMO) antenna along with dual-band-notched features has been investigated. The antenna proposed herein, possesses two mutually orthogonal staircase-etched radiators for achieving a wide bandwidth. The radiating elements are placed mutually perpendicular in order to achieve polarization diversi
Compact planar ultra-wideband antenna with dual notched band for WiMAX and WLAN
A. K. M. Ariful H. Siddique, Rezaul Azim, Mohammad T. Islam
Published online : 01-09-2019
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A compact planar ultra-wideband (UWB) antenna with WiMAX and WLAN notched band is presented in this paper. The presented antenna consists of a rectangular patch and slotted partial ground plane and fed by a microstrip feed line. The volumetric size of the antenna is 30 mm × 22 mm × 1.6 mm. Method of moment-based simulation technology is used to simulate and analyze the characteristics of the anten
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