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1110 documents found for International Journal
MRF volume 10 issue 7 Cover and Back matter
Krzysztof Kulpa
Published online : 01-10-2018
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MRF volume 10 issue 7 Cover and Front matter
Krzysztof Kulpa
Published online : 01-10-2018
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Editorial
Krzysztof Kulpa
Published online : 01-10-2018
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Parylene coated waterproof washable inkjet-printed dual-band antenna on paper substrate
Sangkil Kim, Manos M. Tentzeris
Published online : 01-09-2018
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In this paper, the first reported waterproof inkjet-printed dual-band monopole antenna on the flexible organic paper substrate is presented. The antenna, which operates at 900 MHz and 2.4 GHz, is inkjet-printed on commercially available photopaper using conductive silver nano-particle ink. To protect it from ambient humidity, a 1 µm thick Parylene-C layer was deposited on top of the antenna. To ve
Closed-form model to determine the co-axial probe reactance of an equilateral triangular patch antenna
Manotosh Biswas, Mihir Dam
Published online : 01-09-2018
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A simple closed-form analytical formula is proposed to compute the probe reactance of an equilateral triangular patch antenna. The variation of the probe reactance with the variation of antenna dimension, substrate electrical parameters, and probe location is examined thoroughly. The computed values employing the present model show excellent agreement with experimental and simulation results.
Radio bearing of sources with directional antennas in urban environment
Cezary Zió?kowski, Jan M. Kelner
Published online : 01-09-2018
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This paper focuses on assessing the limitations in the direction-finding process of radio sources with directional antennas in an urbanized environment, demonstrating how signal source antenna parameters, such as beamwidth and maximum radiation direction affect bearing accuracy in non-line-of-sight conditions. These evaluations are based on simulation studies, which use measurement-tested signal p
A dual notched band UWB-BPF based on microstrip-to-short circuited CPW transition
Abu Nasar Ghazali, Mohd Sazid, Srikanta Pal
Published online : 01-09-2018
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This paper proposes a dual notched band ultra-wideband (UWB) bandpass filter (BPF) based on hybrid transition of microstrip and coplanar waveguide (CPW). The CPW in ground plane houses a stepped impedance resonator shorted at ends, and is designed to place its resonant modes within the UWB passband. The microstrips on the top plane are placed some distance apart in a back-to-back manner. The trans
Wideband low-profile aperture-coupled circularly polarized antenna based on metasurface
Qi Zheng, Chenjiang Guo, Jun Ding
Published online : 01-09-2018
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In this paper, a metasurface-based aperture-coupled circularly polarized (CP) antenna with wideband and high radiation gain is proposed and analyzed. The proposed antenna is comprised of coplanar waveguide coupling with 4 × 4 corner truncated square patches, which show compact size and low profile. The mechanism of the CP antenna is analyzed theoretically based on the mode analysis and equivalent
Analysis of HTS circular patch antennas including radome effects
Sami Bedra, Randa Bedra, Siham Benkouda, Tarek Fortaki
Published online : 01-09-2018
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In this paper, the resonant frequencies, quality factors and bandwidths of high superconducting circular microstrip patches in the presence of a dielectric superstrate loading have been studied using Galerkin testing procedure in the Hankel transform domain. The exact Green's function of the grounded dielectric slab is used to derive an electric field integral equation for the unknown current dis
Gain enhancement of UWB antenna using partially reflective surface
Pravin R. Prajapati, Shailesh B. Khant
Published online : 01-09-2018
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This paper proposes, a high gain, Fabry Perot cavity antenna with coplanar waveguide (CPW) fed ultra wide band (UWB) radiating element. The proposed antenna has flat edge arrow shape-based radiating element, which act as a main radiating element and responsible for UWB radiation. This UWB microstrip antenna is parasitically coupled with an array of square parasitic patches (PPs), which act as part
A fractal quad-band antenna loaded with -shaped slot and metamaterial for wireless applications
Tanweer Ali, Mohammad Saadh Aw, Rajashekhar C. Biradar
Published online : 01-09-2018
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A novel concept of using fractal antenna with metamaterial and slot to achieve multiband operation is investigated. The antenna consists of an -shaped slot in the radiating monopole perturbs the surface current distribution; thereby increasing the total current path length which tends the antenna to further operate at 5.5 (upper WiMAX), 7.3 (satellite TV) and 9.9 GHz (X-band), respectively. The ex
An explicit single-layer frequency selective surface design with wide stop band frequency response
M. Bashiri, Ch. Ghobadi, J. Nourinia, M. Majidzadeh
Published online : 01-09-2018
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This manuscript deals with the development of a novel configuration of a wide-band single-layer frequency selective surface (FSS) for wide-band rejection applications. The established unit cell is composed of a simple circular ring on the top side of the substrate and a combined conductive element on the backside. Such an inclusion of conductive elements and accurate tuning of their dimensions end
EMC microwave absorber for outdoor applications
Roman Kubacki, Wojciech G?uszewski, Dariusz Laskowski, Karol Rudyk, Marek Kuchta
Published online : 01-09-2018
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In some circumstances, electromagnetic compatibility testing must be performed not in a specialized anechoic chamber, but in an open space. However, typical absorbers used in anechoic chambers to absorb incident radiation and to reduce the amount of rays reflected from the walls and the floor, such as ferrite tiles and graphite cones, are not suitable in an open space. In this work, we present the
Optimization of wireless sensor network deployment for electromagnetic situation monitoring
Krzysztof Malon, Pawe? Skokowski, Jerzy Lopatka
Published online : 01-09-2018
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Wireless sensor networks are an increasingly popular tool for monitoring various environmental parameters. They can also be used for monitoring the electromagnetic spectrum. Wireless sensors, due to their small size, typically have simplified radio receivers with reduced sensitivity and use small antennas. As a result, their effective performance area is similarly limited. This is especially impor
A 52-to-67 GHz dual-core push?push VCO in 40-nm CMOS
Vadim Issakov, Johannes Rimmelspacher, Saverio Trotta, Marc Tiebout, Amelie Hagelauer, Robert Weigel
Published online : 01-09-2018
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We present a continuously tunable 52-to-67 GHz push?push dual-core voltage-controlled oscillator (VCO) in a 40 nm bulk complementary metal?oxide?semiconductor (CMOS) technology. The circuit is suitable for 60 GHz frequency-modulated-continuous-wave radar applications requiring a continuously tunable ultra-wide modulation bandwidth. The LC-tank inductor is used to couple the two VCO cores. The fund
Plastic and metal additive manufacturing technologies for microwave passive components up to band
Johann Sence, William Feuray, Aurélien Périgaud, Olivier Tantot, Nicolas Delhote, Stéphane Bila, Serge Verdeyme, Jean-Baptiste Pejoine, René-Philippe Gramond
Published online : 01-09-2018
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This paper illustrates the different possibilities given by additive manufacturing technologies for the creation of passive microwave hardware. The paper more specifically highlights a prototyping scheme where the 3D-printed plastic parts can be used as initial proofs of concept before considering more advanced 3D-printed parts (metal parts, for instance). First, a characterization campaign has be
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
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