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1030 documents found for International Journal
Microwave dielectrometry as a tool for the characterization of blood cell membrane activity for diagnostics
Kateryna Arkhypova, Pavlo Krasov, Anatolii Fisun, Andriy Nosatov, Volodymyr Lychko, Volodymyr Malakhov
Published online : 01-10-2017
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This paper deals with the concept of microliter sensing of human blood samples by waveguide dielectrometry at microwave frequency (39.5 GHz). The methods, research protocol, and basic results derived from the permittivity measurements are presented. Here we summarize the results of our 5-year research on developing a multidisciplinary approach to the characterization of erythrocytes dielectric res
A miniaturized dual-band ZOR antenna using epsilon negative transmission line loading
Ashish Gupta, Raghvendra Kumar Chaudhary
Published online : 01-10-2017
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A miniaturized dual-band CPW-fed metamaterial antenna is presented and developed in this paper. Zeroth-order mode is originated by realizing open-ended composite right/left-handed transmission line. A dual split ring resonator is introduced to obtain another mode. The antenna is operated in the frequency region 1.60?1.64 and 2.76?2.79 GHz. Shunt inductance is offered by means of thin stripline con
Planar high rejection dual band-notch UWB antenna with X & Ku-bands wireless applications
Manish Sharma, Yogendra Kumar Awasthi, Himanshu Singh
Published online : 01-10-2017
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In this paper, a vase-shaped monopole antenna is presented for dual band notch (WiMAX IEEE802.16 3.30?3.80 GHz with C-band 3.80?4.20 GHz and WLAN IEEE802.11a/h/j/n 5.15?5.35 GHz, 5.25?5.35 GHz, 5.47?5.725 GHz, 5.725?5.825 GHz) UWB and other wireless services (close range radar: 8?12 GHz in X-band & satellite communication: 12?18 GHz in Ku-band). Measured VSWR of proposed antenna shows a high band-
Miniaturized tri-band filtering-response power divider with short- and open-stub-loaded resonators
Zongrui He, Kaijun Song, Bo Zeng, Yu Zhu, Yong Fan
Published online : 01-10-2017
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A miniaturized tri-passband power divider integrating a power divider with two tri-band bandpass filters is presented. The short- and open-stub-loaded resonators are used in this presented power divider to implement the bandpass-filtering response. Then, the presented power divider has not only the power-dividing/combining function, but also the tri-passband filtering response. When the central fr
Perturbation theory-based field analysis of arbitrary-shaped microstrip patch antenna
Karishma Sharma, Dharmendra K. Upadhyay, Harish Parthasarathy
Published online : 01-10-2017
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In this paper, the concept of perturbation theory is applied to derive a general electric field (E-field) expression for any arbitrary-shaped microstrip patch antenna. The arbitrary shape is created by adding small perturbation in a regular patch shape, which is used to find perturbed and unperturbed electromagnetic wave solutions for resultant E-field of patch antenna. Ansoft HFSS simulator is us
A low phase noise and frequency agility synthesizer for millimeter-wave transceiver
Qianhua Fu
Published online : 01-10-2017
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With the increasing demand of millimeter-wave (MMW) communication, the performance of its frequency synthesizer has high requirements. In this paper, a multiple conversion mechanism, which used hybrid frequency synthesis technique is presented. Some key modules include linear frequency-modulated generator, agile, and low phase noise local oscillators (LOs), automatic gain control, receiver front-e
A dual-band crossover using cross-shaped microstrip line for small and large band ratios
Idury Satya Krishna, Rusan Kumar Barik, S. S. Karthikeyan
Published online : 01-10-2017
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A novel design of planar dual-band microstrip crossover operating at small and large frequency ratios is presented. These features of the proposed dual-band crossover are achieved by a cross-shaped transmission line. To obtain the dual-band characteristics, the required closed form design formulas are computed using the ABCD matrix method. Based on the design formulas, the realizable small and lar
Fractional Fourier transform-based chirp radars for countering self-protection frequency-shifting jammers
Samer Baher Safa Hanbali, Radwan Kastantin
Published online : 01-10-2017
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Self-protection deceptive jammers create at the radar receiver output multiple-false targets that are impossible to isolate in both time and frequency domains. In this paper, we introduce a novel technique based on fractional Fourier transform (FrFT) to discriminate between the true target echo and those false targets in the case of frequency-shifting jammers. In fact, we exploit the capability of
2D Extended envelope memory polynomial model for concurrent dual-band RF transmitters
Shoaib Amin, Per N. Landin, Peter Händel, Daniel Rönnow
Published online : 01-10-2017
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The paper presents a two-dimensional (2D) extended envelope memory polynomial model for concurrent dual-band radio frequency (RF) power amplifiers (PAs). The model is derived based on the physical knowledge of a dual-band RF PA. The derived model contains cross-modulation terms not included in previously published models; these terms are found to be of importance for both behavioral modeling and d
Dual-layered polarization and frequency reconfigurable microstrip antenna by rotating breach-truncated circular radiator
Haixiong Li, Yunlong Gong, Jiakai Zhang, Jun Ding, Chenjiang Guo
Published online : 01-10-2017
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In this study, a dual-layered polarization and frequency reconfigurable microstrip antenna is proposed based on sequential mechanical axial rotation of the circular metal radiator. The antenna can be reconfigured among three different polarized modes, including the linear polarization (LP), left-handed circular polarization and right-handed circular polarization in the band from 4.68 to 4.80 GHz (
A linearity improved quad-band amplifier based on E-CRLH transmission line
Rasool Keshavarz, Abbas Mohammadi, Abdolali Abdipour
Published online : 01-10-2017
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This paper outlines a new class of quad-band amplifier (QBA) realized using extended composite right- and left-handed coupled lines. The design procedure to reach the QB CLs with predefined frequency operations and characteristic impedance of their ports is clearly presented. Designed and fabricated QBA operation frequencies are and (output port B) and (output port C) and the proposed structur
Optically controlled UWB antenna using photonic crystal waveguides
Heba Zakaria, Moataza Hindy, Adel El-Henawi
Published online : 01-10-2017
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This paper presents a new optically controlled reconfigurable ultra-wideband antenna using reconfigurable optical router with photonic crystal substrate. The proposed antenna has three optical switches. The optical switches are made by placing silicon wafers over three slots etched on the resonator. The coplanar fed microstrip antenna can work at eight modes using optically controlled switches. Th
Flexible and moon-shaped slot UWB implantable antenna design for head implants
Roshanak Elyassi, Gholamreza Moradi
Published online : 01-10-2017
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In this paper, we present a novel flexible moon-shaped slot implantable antenna for neural recording systems and head implants. It covers both medical Industrial, Scientific and Medical band (2.45 GHz) and impulse ratio ultra-wideband (IR-UWB) frequency range (3.1?10.6 GHz) for forward and backward telemetry applications. It has a simple and miniaturized structure in comparison with the antennas r
MRF volume 9 issue 7 Cover and Back matter
Anja Skrivervik, Carlo Riva, Lars Foged
Published online : 01-11-2017
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MRF volume 9 issue 7 Cover and Front matter
Anja Skrivervik, Carlo Riva, Lars Foged
Published online : 01-11-2017
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EuCAP 2016 special issue
Anja Skrivervik, Carlo Riva, Lars Foged
Published online : 01-11-2017
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Measurement of BepiColombo mission medium gain antenna parameters under realistic thermal conditions
Victor Sanchez, Fernando Martin, Aingeru Barrio, Iñaki Pinto, Rafael Garcia, Manuel Sierra, Leandro de Haro, José Luis Besada, Belén Galocha
Published online : 01-09-2017
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This paper is focused on explaining the radiation test in temperature performed on the Engineering and Qualification Model of the Medium Gain Antenna Radiofrequency (MGA-RFA) Assembly of ESA's BepiColombo mission. The goal of this program is to observe and study Mercury and its surroundings in a very demanding environment in terms of temperature and radiation. The MGA is an X-band two-axis steerab
Analysis of time filtering techniques for echo reduction in antenna measurements
Pilar González-Blanco, Manuel Sierra-Castañer
Published online : 01-09-2017
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This paper presents a review of filtering methods to eliminate echo in antenna measurements. Two different methods, fast Fourier transform and Matrix Pencil, are explained, compared, and simulated in a planar near field where other effects, such as aliasing, can and will be present if the simulation is not appropriately made and the parameters are not carefully chosen. Finally both methods are app
Design of atomic clock cavity based on a loop-gap geometry and modified boundary conditions
Anton E. Ivanov, Christoph Affolderbach, Gaetano Mileti, Anja K. Skrivervik
Published online : 01-09-2017
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In this study, we investigate a concept that can be used to improve the magnetic field homogeneity in a microwave cavity applied in a novel, high-performance atomic frequency standard. We show that by modifying the boundary conditions in the case of a loop-gap geometry, a good improvement of the field homogeneity can be obtained. Such a design demonstrates high potential to improve the frequency s
Focal quality metrics for the objective evaluation of confocal microwave images
Declan O'loughlin, Finn Krewer, Martin Glavin, Edward Jones, Martin O'halloran
Published online : 01-09-2017
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Confocal microwave imaging for breast cancer detection relies on accurate knowledge of the average dielectric properties of the patient-specific breast. When accurately estimated, coherent addition will occur at the tumor site, producing a clear and sharp image thereof. Conversely, if the average dielectric properties are poorly estimated, a blurred, unfocused image will be reconstructed, potentia
Low-profile tunable radiator for small satellite application
Nevena ?aponji?, Tomislav Debogovi?, Frédéric Bongard, Pedro Robustillo-Bayon, Maria Carolina Vigano, Mikael Krummen, Jean-Daniel Landis, Marco Sabbadini
Published online : 01-09-2017
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A tunable radiator for space application has been developed to meet stringent requirements in terms of electrical and environmental specifications but also low mass, simple manufacturing and low cost. The element is based on the folded planar inverted F-antenna, with size of one quarter of wavelength. It is mechanically tunable to adjust input impedance for any various positions on the satellite b
MIMO radar pseudo-orthogonal waveform generation by a passive 1 × mode-mixing microwave cavity
Ettien L. Kpré, Cyril Decroze, Thomas Fromenteze
Published online : 01-09-2017
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Multiple Input Multiple Output (MIMO) Radar has many advantages compared with conventional Radars including improved target parameters estimation, improved angular resolution while keeping a small number of antennas. Nevertheless, these advantages can be obtained when probing simultaneously the scattering matrix with orthogonal transmit signals. Recently, a passive orthogonal waveform generation t
Passive intermodulation model and experimental verification of cascaded microwave devices
Tuanjie Li, Kai Zhang, Jie Jiang
Published online : 01-09-2017
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Passive intermodulation (PIM) is a complex problem in high-power microwave devices and satellite communications. In this paper, an effective calculation method is proposed for predicting PIM power levels of the cascaded microwave devices. First of all, the analytical formula of intermodulation voltage is derived based on the nonlinear I?V characteristics of microwave devices. Then, the mathematica
Design and development of a stacked complementary microstrip antenna with a ??-shaped DGS for UWB, UNII, WLAN, WiMAX, and Radio Astronomy wireless applications
Amanpreet Kaur, Rajesh Khanna
Published online : 01-09-2017
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The proposed research paper presents the design, development, and experimental testing of a broadband stacked complementary microstrip antenna for ultra-wideband (UWB) (5.28?5.85 GHz), Unlicensed National Information Infrastructure band (UNII) (5.25?5.825 GHz), wireless local area networks (WLAN, IEEE802.11a, 5.15?5.35 GHz), and IEEE 802.11b (5.75?5.85 GHz), Worldwide Interoperability for Microwav
A new compact and miniaturized multiband uniplanar CPW-fed Monopole antenna with T-slot inverted for multiple wireless applications
Rachid Dakir, Jamal Zbitou, Ahmed Mouhsen, Abdelwahed Tribak, Angel Mediavilla Sanchez, Mohamed Latrach
Published online : 01-09-2017
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In this paper, the design of a new compact uniplanar coplanar waveguide-fed antenna for multiband wireless application is presented and investigated. This antenna has a compact size of 25 × 25 mm and consists of a three parallel stub optimized added on rectangular slot to the radiator patch and T-shaped which inverted in the ground plane. The final prototype antenna designing resonantes at frequen
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