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1094 documents found for International Journal
MRF volume 10 issue 5-6 Cover and Back matter
Ingmar Kallfass, Martin Vossiek, Matthias A. Hein
Published online : 01-08-2018
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MRF volume 10 issue 5-6 Cover and Front matter
Ingmar Kallfass, Martin Vossiek, Matthias A. Hein
Published online : 01-08-2018
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Octave bandwidth S- and C-band GaN-HEMT power amplifiers for future 5G communication
Felix Rautschke, Stefan May, Sebastian Drews, Daniel Maassen, Georg Boeck
Published online : 01-06-2018
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In this contribution, a design methodology for octave-bandwidth power amplifiers (PA) for 5G communication systems using surface mount dual-flat-no-lead packaged gallium-nitride high-electron-mobility transistor devices is presented. Systematic source- and load-pull simulations have been used to find the optimum impedances across 75% fractional bandwidth for S- (1.9?4.2 GHz) and C-band (3.8?8.4 GH
Guest Editorial ? EuMW Special Issue
Ingmar Kallfass, Martin Vossiek, Matthias A. Hein
Published online : 01-08-2018
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76?81 GHz LTCC antenna for an automotive miniature radar frontend
Frank Sickinger, Ernst Weissbrodt, Martin Vossiek
Published online : 01-06-2018
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For a fully 360° detection around a vehicle, novel automotive radar system concepts consist of up to eight radar sensors. The existing sensor-mounting areas, such as front grill or bumper corners would no longer be sufficient. Therefore, additional mounting positions such as B-pillars and side skirts have to be considered, where the radar can observe the side area of the vehicle. However, these ne
A 1 to 32 GHz broadband multi-octave receiver for monolithic integrated vector network analyzers in SiGe technology
Marco Dietz, Andreas Bauch, Klaus Aufinger, Robert Weigel, Amelie Hagelauer
Published online : 01-06-2018
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A multi-octave receiver chain is presented for the use in a monolithic integrated vector network analyzer. The receiver exhibits a very wide frequency range of 1?32 GHz, where the gain meets the 3 dB-criterion. The differential receiver consists of an ultra-wideband low noise amplifier, an active mixer and an output buffer and exhibits a maximum conversion gain (CG) of 16.6 dB. The main design goa
Industrial scale microwave applicator for high temperature alkaline hydrolysis of PET
Vasileios Ramopoulos, Guido Link, Sergey Soldatov, John Jelonnek
Published online : 01-06-2018
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A microwave design for an industrial scale applicator of a continuous microwave assisted depolymerization of polyethylene terephthalate (PET) has been developed. The cavity is designed for use in combination with an Archimedean screw pump to transport the reaction material, surrounded by a cylindrical pipe with a diameter of 250 mm and a length of 250 mm at the 2.45 GHz ISM band. The proposed desi
EM simulation assisted parameter extraction for transferred-substrate InP HBT modeling
Tom K. Johansen, Ralf Doerner, Nils Weimann, Maruf Hossain, Viktor Krozer, Wolfgang Heinrich
Published online : 01-06-2018
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In this paper, an electromagnetic (EM) simulation assisted parameter extraction procedure is demonstrated for accurate modeling of down-scaled transferred-substrate InP HBTs. The external parasitic network associated with via transitions and device electrodes is carefully extracted from calibrated three-dimensional EM simulations up to 325 GHz. Following an on-wafer multi-line Through-Reflect-Line
Reliability analysis of BiCMOS SiGe:C technology under aggressive conditions for emerging RF and mm-wave applications: proposal of reliability-aware circuit design methodology
Insaf Lahbib, Sidina Wane, Aziz Doukkali, Dominique Lesénéchal, Thanh Vinh Dinh, Laurent Leyssenne, Rosine Coq Germanicus, Françoise Bezerra, Guy Rolland, Cristian Andrei, Guy Imbert, Patrick Martin, Philippe Descamps, Guillaume Boguszewski, Damienne Bajon
Published online : 01-08-2018
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In this contribution, the impact of extreme environmental conditions in terms of energy-level radiation of protons on silicon?germanium (SiGe)-integrated circuits is experimentally studied. Canonical representative structures including linear (passive interconnects/antennas) and non-linear (low-noise amplifiers) are used as carriers for assessing the impact of aggressive stress conditions on their
A new class of nondiffracting pulses based on focusing leaky waves
Walter Fuscaldo, Davide Comite, Alessandro Boesso, Paolo Baccarelli, Paolo Burghignoli, Alessandro Galli
Published online : 01-06-2018
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In this work, we propose an azimuthally-invariant periodic leaky-wave (LW) radiator for the generation of Bessel beams and X-waves by means of backward cylindrical LWs at millimeter wavelengths. A rigorous framework is first outlined to understand the theoretical constraints of such a novel design. A specific attention is devoted to the impact of the attenuation constant on the focusing properties
Liquid-crystal-based amplitude tuner and tunable SIW filter fabricated in LTCC technology
Ananto E. Prasetiadi, Matthias Jost, Baerbel Schulz, Matthias Quibeldey, Torsten Rabe, Ruediger Follmann, Rolf Jakoby
Published online : 01-08-2018
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Tunable microwave devices will play an important role in future wireless systems, in which high-frequency bands, e.g. millimeter waves, will become promising, due to its huge spectrum availability. At such frequency bands, liquid crystals (LCs) exhibit low microwave loss, which is excellent compared with the other tuning elements. In this paper, LC-based microwave components are fabricated by usin
Transfer of AlGaN/GaN RF-devices onto diamond substrates via van der Waals bonding
Thomas Gerrer, Volker Cimalla, Patrick Waltereit, Stefan Müller, Fouad Benkhelifa, Thomas Maier, Heiko Czap, Oliver Ambacher, Rüdiger Quay
Published online : 01-06-2018
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We present a novel bonding process for gallium nitride-based electronic devices on diamond heat spreaders. In the proposed technology, GaN devices are transferred from silicon (Si) onto single (SCD) and polycrystalline diamond (PCD) substrates by van der Waals bonding. Load-pull measurements on Si and SCD heat spreaders at 3 GHz and 50 V drain bias show comparable power-added-efficiency and output
GaN-based single-chip frontend for next-generation X-band AESA systems
Patrick Schuh, Hardy Sledzik, Rolf Reber
Published online : 01-06-2018
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A next generation of active electronically scanned array (AESA) antennas will be challenged with the need for lower size, weight, power, and cost. This leads to enhanced demands especially with regard to the integration density of the radio frequency-part inside a / module. The semiconductor material GaN has proven its capacity for high-power amplifiers (HPA), robust receive components as well as
Micromachining integration platform for sub-terahertz and terahertz systems
Vladimir Ermolov, Antti Lamminen, Jaakko Saarilahti, Ben Wälchli, Mikko Kantanen, Pekka Pursula
Published online : 01-06-2018
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We demonstrate a sub-terahertz (THz) and THz integration platform based on micromachined waveguides on silicon. The demonstrated components in the frequency range 225?325 GHz include waveguides, filters, waveguide vias, and low-loss transitions between the waveguide and the monolithic integrated circuits. The developed process relies on microelectromechanical systems manufacturing methods and sili
Convolutional neural networks for parking space detection in downfire urban radar
Javier Martinez, Dominik Zoeke, Martin Vossiek
Published online : 01-06-2018
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We present a method for detecting parking spaces in radar images based on convolutional neural networks (CNN). A multiple-input multiple-output radar is used to render a slant-range image of the parking scenario and a background estimation technique is applied to reduce the impact of dynamic interference from the surroundings by separating the static background from moving objects in the scene. A
Tunable -enhanced LC dual-band filtering at microwave frequencies in 0.13 µm SiGe BiCMOS
Farooq Amin, Sanjay Raman, Kwang-Jin Koh
Published online : 01-06-2018
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This paper presents an active -enhanced LC dual-band band-pass filtering approach using parallel synthesis techniques at X- and Ku-bands in 0.13 m SiGe BiCMOS technology. By employing two independently tunable parallel LC-tanks with either in-phase and out-of-phase addition, independently tunable dual-band filtering is achieved. For higher out-of-band (OOB) attenuation, subtraction of the two 2-or
K/Ka-band dual-polarized SIW-fed lens antennas for Rx/Tx integration
Thomas Jaschke, Hans K. Mitto, Arne F. Jacob
Published online : 01-06-2018
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This contribution deals with array elements for K/Ka-band satellite communication terminals. It proposes an end-fire design realized in substrate integrated waveguide technology and featuring dual-band functionality, and dual circular polarization. The latter is achieved by means of a dual-band orthomode transducer. An extended hemispherical dielectric lens ensures good matching and radiation prop
Design and demonstration of acoustically optimized, fully-printed, BST MIM varactors for high power matching circuits
Daniel Kienemund, Nicole Bohn, Thomas Fink, Mike Abrecht, Walter Bigler, Joachim R. Binder, Rolf Jakoby, Holger Maune
Published online : 01-06-2018
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This work addresses the piezoelectric induced reduction of quality factor in fully-printed metal-insulator-metal (MIM) barium strontium titanate (BST) thick film varactors designed for high power operation. An acoustically optimized varactor design is presented and compared to a non-optimized high-power varactor. The design is utilized to present a narrowband acoustic suppression technique based o
Low-current cathode spatial harmonic magnetrons: analysis and realization based on metamaterial loaded slow wave structures
Nasrin Nasr Esfahani
Published online : 01-06-2018
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This paper provides an overview of theory, design, simulation, and fabrication of novel spatial harmonic magnetrons (SHMs). An approximate analysis which provides the guidelines for the design and predicts the important characteristics of these devices will be presented. This analysis shows that the metamaterial loaded SHMs can start generating power with very small cathode current densities which
A multiport vector network analyzer with high-precision and realtime capabilities for brain imaging and stroke detection
Sebastian Poltschak, Markus Freilinger, Reinhard Feger, Andreas Stelzer, Abouzar Hamidipour, Tommy Henriksson, Markus Hopfer, Ramon Planas, Serguei Semenov
Published online : 01-06-2018
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Medical imaging is of great importance for patients affected by stroke. Since an early examination of the patient is necessary for successful recovery, there is room to improve the existing capabilities of analysis. Common systems like magnetic resonance imaging or computed tomography are precise, but stationary, and therefore, not ideally suited for the early analysis of stroke. The presented mul
Multi-functional D-band / modulator/demodulator MMICs in SiGe BiCMOS technology
Sona Carpenter, Zhongxia Simon He, Herbert Zirath
Published online : 01-06-2018
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This paper presents the design and characterization of a D-band (110?170 GHz) monolithic microwave integrated direct carrier quadrature modulator and demodulator circuits with on-chip quadrature local oscillator (LO) phase shifter and radio frequency (RF) balun fabricated in a 130 nm SiGe BiCMOS process with / of 250 GHz/400 GHz. These circuits are suitable for low-power ultra-high-speed wireless
A 219?266 GHz LO-tunable direct-conversion IQ receiver module in a SiGe HBT technology
P. Rodriguez Vazquez, J. Grzyb, N. Sarmah, B. Heinemann, U.R. Pfeiffer
Published online : 01-06-2018
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This paper presents a fully-integrated direct-conversion fundamentally-operated mixer-first quadrature receiver module with a tunable LO in the 219?266 GHz band. It has been implemented in a 0.13-?m SiGe heterojunction bipolar transistor technology. It includes an on-chip LO path driven externally from the printed circuit board (PCB) connector level at 13.6?16.7 GHz. A hybrid coupler generates the
Automotive antenna diversity system for satellite radio with high phase accuracy in low SNR-scenarios
Simon Senega, Ali Nassar, Stefan Lindenmeier
Published online : 01-06-2018
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For a fast scan-phase satellite radio antenna diversity system a noise correction method is presented for a significant improvement of audio availability at low signal-to-noise ratio (SNR) conditions. An error analysis of the level and phase detection within the diversity system in the presence of noise leads to a correction method based on a priori knowledge of the system's noise floor. This meth
Analysis of multipath and DOA detection using a fully polarimetric automotive radar
Tristan Visentin, Jürgen Hasch, Thomas Zwick
Published online : 01-06-2018
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Multipath propagation occurs in many situations of radar measurements in complex environments. The unwanted effects range from interference over the radar channels, which causes amplitude fading and a corrupted direction of arrival (DOA) estimation, to the detection of ghost targets in an angle of arrival of the multipath direction. Due to the different number of reflections, polarimetric radars a
A 216?256 GHz fully differential frequency multiplier-by-8 chain with 0 dBm output power
M.H. Eissa, A. Malignaggi, M. Ko, K. Schmalz, J. Borngräber, A.C. Ulusoy, D. Kissinger
Published online : 01-06-2018
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This work presents a fully differential wideband and low power 240 GHz multiplier-by-8 chain, manufactured in IHP's 130 nm SiGe:C BiCMOS technology with / = 300/500 GHz. A single ended 30 GHz input signal is multiplied by 8 using Gilbert cell-based quadrupler and doubler, and then amplified with a wideband differential 3-stage cascode amplifier. To achieve wide bandwidth and optimize for power con
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