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1110 documents found for International Journal
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
Broadband coupled-line directional couplers with high impedance transformation ratio
Krzysztof Wincza, Slawomir Gruszczynski
Published online : 01-09-2017
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
Quad notched-band UWB BPF based on quintuple-mode resonator
Seyyed Jamal Borhani, Mohammad Amin Honarvar, Bal S. Virdee
Published online : 01-09-2017
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The design of a novel microstrip ultra-wideband (UWB) bandpass filter with quad narrow notched-band functionality is presented. The filter consists of a multi-mode resonator (MMR) constituted from two modified stepped-impedance stubs that generate six resonate modes, five of which are within the UWB passband where the sixth mode is used to extend the upper stopband of the filter. Two transmission
A single-sided meandered-dual-antenna structure for UHF RFID tags
Pouria Kamalvand, Gaurav Kumar Pandey, Manoj Kumar Meshram
Published online : 01-09-2017
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A meandered-dual-antenna structure is proposed for UHF radiofrequency identification (RFID) tag. It is composed of two independent antennas printed on the one side of the substrate board. One of the antennas is exclusively used for receiving and harvesting sufficient energy to the tag chip having the complex conjugate impedance of the receiving antenna. The other is for backscatter to enhance maxi
Directivity improvement and optimal far field pattern of time modulated concentric circular antenna array using hybrid evolutionary algorithms
Gopi Ram, Durbadal Mandal, Rajib Kar, Sakti Prasad Ghoshal
Published online : 01-02-2017
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In this paper time modulated nine-ring concentric circular antenna array (TMCCAA) using fitness based novel hybrid adaptive differential evolution with particle swarm optimization (ADEPSO) has been studied. ADEPSO is hybrid of fitness based adaptive differential evolution and particle swarm optimization (PSO). Differential evolution is a simple and robust evolutionary algorithm but sometimes cause
Broad band circularly polarized square slot array antenna with improved sequentially rotated feed network for C-band application
Puria Bairami, Mahdi Zavvari
Published online : 01-02-2017
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In this paper, an array antenna with asymmetric antenna fed network is presented. Total size of the proposed array antenna (with 2 × 2 elements) is 90 × 90 mm and distance between elements (fed by fed) is ?/2 (? = wavelength in free space). The proposed antenna is fed by coaxial cable that isolated input impedance from impedance of the array antenna feed network. The measured impedance bandwidth o
Compact dual-band truncated patch antenna with fractal defected ground structure for wireless applications
B. Rama Sanjeeva Reddy, D. Vakula
Published online : 01-02-2017
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In this paper, a compact, dual-band patch antenna is proposed over Minkowski fractal defected ground structure (DGS) for bandwidth enhancement of global positioning system (GPS) applications. The proposed design combines the truncated dual L-shaped slits cut on diagonal corners of radiating patch and fractal defect on the metallic ground plane. This concept shifts the frequencies to lower bands wi
A CPW-fed stepped slot UWB antenna for MIMO/diversity applications
Raj Kumar, Neha Pazare
Published online : 01-02-2017
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An ultra-wideband (UWB) slot antenna for diversity applications is introduced. The overall structure of the antenna consists of two similar coplanar waveguide (CPW)-fed stepped rectangular slots placed in an orthogonal position. The slots are asymmetric with respect to their placement in the ground plane. The CPW feeds are double stepped and terminated on hexagonal patches for better impedance mat
Super wideband antenna with single band suppression
Murli Manohar, Rakhesh Singh Kshetrimayum, Anup Kumar Gogoi
Published online : 01-02-2017
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In this paper, a band-notched compact printed monopole super wideband (SWB) antenna has been designed and fabricated. The SWB antenna composed of a radiating patch with a 50 ? triangular tapered feed line which is connected through a feed region, and a chamfered ground plane (CGP), that covers the frequency band from 0.9?100 GHz (ratio bandwidth of 111.1:1) with a reflection coefficient |S| < ?10
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