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1030 documents found for International Journal
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
Super wideband printed monopole antenna for ultra wideband applications
Sandeep Kumar Palaniswamy, Malathi Kanagasabai, Shrivastav Arun Kumar, M. Gulam Nabi Alsath, Sangeetha Velan, Jayaram Kizhekke Pakkathillam
Published online : 01-02-2017
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This paper presents the design, testing, and analysis of a clover structured monopole antenna for super wideband applications. The proposed antenna has a wide impedance bandwidth (?10 dB bandwidth) from 1.9 GHz to frequency over 30 GHz. The clover shaped antenna with a compact size of 50 mm × 45 mm is designed and fabricated on an FR4 substrate with a thickness of 1.6 mm. Parametric study has been
Reconfigurable antennas with frequency, polarization, and pattern diversities for multi-radio wireless applications
Chilukuri Sulakshana, Lokam Anjaneyulu
Published online : 01-02-2017
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This paper presents different reconfigurable antennas with frequency, polarization, and pattern diversities. All the antennas have a very simple, novel, and compact structures, which are used for different wireless communication applications. These antennas employ switching for obtaining different reconfigurations. At first, an E-shaped antenna is designed for multi-band frequency reconfigurabilit
Four element triangular dielectric resonator antenna for wireless application
Ravi Kumar Gangwar, Pinku Ranjan, Abhishek Aigal
Published online : 01-02-2017
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A wideband four element triangular dielectric resonator antenna (TDRA) has been designed and fabricated by using 50 ? coaxial probe feed. The input and radiation characteristics of the proposed antenna have been extracted through Ansoft HFSS and CST Microwave Studio simulation software and compared with the experimental results. The simulated results have been in good agreement with the experiment
Conformal antenna array for millimeter-wave communications: performance evaluation
V. Semkin, A. Bisognin, M. Kyrö, V-M. Kolmonen, C. Luxey, F. Ferrero, F. Devillers, A.V. Räisänen
Published online : 01-02-2017
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In this paper, we study the influence of the radius of a cylindrical supporting structure on radiation properties of a conformal millimeter-wave antenna array. Bent antenna array structures on cylindrical surfaces may have important applications in future mobile devices. Small radii may be needed if the antenna is printed on the edges of mobile devices and in items which human beings are wearing,
Minimum redundancy MIMO array synthesis with a hybrid method based on cyclic difference sets and ACO
Jian Dong, Ronghua Shi, Ying Guo
Published online : 01-02-2017
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As a recently proposed concept, multiple-input multiple-output (MIMO) radars exhibit much higher spatial resolution than traditional transmitter based radars because of the synthesized virtual array. In this paper, the problem of minimum redundancy (MR)-MIMO array synthesis is addressed, which seeks to maximize the virtual array aperture of MIMO radars for a given number of transmitting and receiv
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