Home » International Journal

International Journal

Find a document written by the best international scientists in our secure database.

967 documents found for International Journal
MRF volume 9 issue 7 Cover and Back matter
Anja Skrivervik, Carlo Riva, Lars Foged
Published online : 01-11-2017
Article Access
View abstract
MRF volume 9 issue 7 Cover and Front matter
Anja Skrivervik, Carlo Riva, Lars Foged
Published online : 01-11-2017
Article Access
View abstract
EuCAP 2016 special issue
Anja Skrivervik, Carlo Riva, Lars Foged
Published online : 01-11-2017
Article Access
View abstract
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
Article Access
View abstract
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
Article Access
View abstract
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
Article Access
View abstract
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
Article Access
View abstract
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
Article Access
View abstract
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
Article Access
View abstract
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
Article Access
View abstract
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
Article Access
View abstract
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
Article Access
View abstract
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
Broadband coupled-line directional couplers with high impedance transformation ratio
Krzysztof Wincza, Slawomir Gruszczynski
Published online : 01-09-2017
Article Access
View abstract
A new class of 3-dB impedance transforming directional couplers has been proposed in which the recently published coupled-line couplers, consisting of coupled-line sections having different electrical lengths, have been utilized. The main advantage of the proposed directional couplers is the possibility of obtaining high impedance transformation ratio, thus the known limiting condition of realizab
Low-cost and compact 3D circularly polarized Microstrip antenna with high efficiency and wide beamwidth
Xi Chen, Zhen Wei, Dan Wu, Long Yang, Guang Fu
Published online : 01-09-2017
Article Access
View abstract
A compact three-dimensional (3D) circularly polarized (CP) microstrip antenna is presented in this paper. The antenna adopts three low-cost printed circuit boards to form an integrated and closed 3D structure, and the radiation patch and the feed patches are etched on the surface of that. A crossed slot is cut on the radiation patch to miniaturize the antenna, and triangular feed patches are intro
ISAR imaging of moving satellite based on GO?PO scattering model
Jiakun Wang, Min Zhang, Pengbo Wei, Panpan Jiang
Published online : 01-09-2017
Article Access
View abstract
An efficient algorithm is proposed for the radar cross-section (RCS) prediction of complex target with electronically large size, which is a combination of geometrical optics and physical optics (GO?PO) method. The method taking the multiple reflections into account is applied to the electromagnetic scattering analysis of a satellite model. Then RCS curves of entire satellite model and the model w
Miniaturized dual-band filter with return loss bandwidth and transmission zero control
Di Lu, N. Scott Barker, Xiao-Hong Tang
Published online : 01-09-2017
Article Access
View abstract
In this paper, a compact dual-band bandpass filter (DB-BPF) using new dual-mode resonator-loaded resonators (DM-RLRs) is presented and investigated to simultaneously achieve controllable return loss (RL), bandwidth (BW) and transmission zeros (TZs), and the simple strategy for this type of filter design is proposed. The DB-BPF consists of two high-flexibility DM-RLRs with separated electric and ma
Penta-band linear tapered feed planar spiral antenna for vehicular communications
Ramya, Thipparaju Rama Rao
Published online : 01-09-2017
Article Access
View abstract
Owing to dynamic nature of vehicular environments, it becomes essential to achieve effective communication via vehicle-to-vehicle and infrastructure-to-vehicle. This leads to the need for an antenna system that supports multiple frequency bands, high gain, broadside radiation pattern, and circular polarization. We propose single-arm penta-band-based spiral antenna with dimensions of 51 × 35 × 1.57
Compact tri-band bandpass filter using asymmetric stub-loaded stepped-impedance resonator with multiple transmission zeros
Hai-Wen Liu, Fan Liu, Bao-Ping Ren, Ai-Ping Yao, Xiang Xiao, Yun-Xiu Yang, Xue-Hui Guan
Published online : 01-09-2017
Article Access
View abstract
In this paper, a tri-band bandpass filter (BPF) using asymmetric stub-loaded stepped-impedance resonator (SL-SIR) is presented. The asymmetric characteristic of SL-SIR broadens degrees of freedom for three controllable modes design. Also, the coupling coefficients (M) and the external quality factors (Q) at each passband of the filter can be independently adjusted by the proposed mixed-type feedli
Design of a microstrip dual-frequency diplexer using microstrip cells analysis and coupled lines components
Leila Noori, Abbas Rezaei
Published online : 01-09-2017
Article Access
View abstract
In this paper, a microstrip diplexer composed of two similar resonators is designed. The proposed resonator is consisting of four microstrip cells, which are connected to a coupled lines structure. In order to select a suitable geometric structure, first, all cells are assumed as undefined structures where there is a lack of basic information about their geometry and dimensions. Then, an equivalen
Reconfigurable microstrip slot antenna with DGS for UWB applications
Mehri Borhani Kakhki, Pejman Rezaei
Published online : 01-09-2017
Article Access
View abstract
In this paper, a frequency reconfigurable microstrip slot antenna for ultra-wideband applications with switchable band-notch functions is designed and manufactured. To generate a wide usable fractional bandwidth of 3 to over 13.6 GHz, square patch transforms to a fork-shaped patch, also two triangular-shaped strips have been added at above sections of rectangular slot on the ground plane. Band rej
Circuit models of lossy coaxial shielded cables connected to non-linear loads to analyze radiated and conducted susceptibilities
Mohamed Saih, Hicham Rouijaa, Abdelilah Ghammaz
Published online : 01-09-2017
Article Access
View abstract
This paper studies the variation effects of incident plane wave on shielded coaxial cables, using Branin's method, which is called the method of characteristics. That model can be directly used for the time- and frequency-domain analyses. Moreover, it had the advantage of being used without the need of setting the preconditions of the charges applied to its ends. This makes it easy to insert in ci
Study of dual-band inline mixed coupled BPF design and two transmission zero pairs controlling mechanism
Di Lu, Teng-Fei Yan, Xiao-Hong Tang
Published online : 01-09-2017
Article Access
View abstract
In this letter, a passive high-selectivity dual-band filter with two controllable transmission zero (TZ) pairs is proposed, while synthesis method and control mechanism of the two TZ pairs are investigated. Specifically, by employing the magnetic/electric mixed coupling (MEMC), source?load coupling (S?L coupling) and stepped-impedance resonators, a dual-band bandpass filter with two pairs of contr
Miniaturized substrate-integrated coaxial line bandpass filter with improved upper stopband
Yunlong Lu, Yi Wang, Taijun Liu, Bo Yu, Kai Li
Published online : 01-09-2017
Article Access
View abstract
A miniaturized substrate-integrated coaxial line (SICL) bandpass filter with improved upper stopband using asymmetrical spiral stub-loaded resonators is presented in this paper. Owing to the space-filling feature of the spiral structure, the size of the proposed filter is significantly reduced. A theoretical analysis is carried out to examine the resonance property of the proposed resonator. It is
X-band compact dual circularly polarized isoflux antenna for nanosatellite applications
Eric Arnaud, Cyrille Menudier, Jamil Fouany, Thierry Monediere, Marc Thevenot
Published online : 01-09-2017
Article Access
View abstract
This paper presents an original solution to design a compact dual circularly polarized isoflux antenna for nanosatellite applications. This kind of antenna has been previously designed in our laboratory, for a single circular polarization. This antenna is composed of a dual circularly polarized feed and a choke horn antenna. This feed is a cross-shaped slot in the ground plane, which provides coup
Compact tag antenna for UHF active RFID applications
Jui-Han Lu, Zi-Hao Liou
Published online : 01-09-2017
Article Access
View abstract
By introducing an L-shaped metal plate connecting with the spiral monopole antenna, a planar compact ultra-high-frequency (UHF) tag antenna for radiofrequency identification system is proposed. With the overall antenna size of only 13 × 9 × 1.6 mm, the proposed tag antenna provides the measured impedance bandwidth of 12 MHz to comply with Taiwan UHF operating band (922?928 MHz). The measured peak
0 document found for International Journal

ArtWhere Création de site Internet