bluuebunny/crossref_metadata_2025_split huggingface dataset:
Eccentricity fault diagnosis in three‐phase‐wound‐rotor induction machine using numerical discrete modeling method
Authors: Naderi Peyman , Fallahi Farzad 
Published: March 2016

SummaryIn recent years, several papers have dealt with eccentricity fault diagnosis considering the cage‐induction machine while wound machine type has not been studied as a case. In this paper, eccentricity fault is studied based on the current/torque signature considering modified winding function approach (MWFA). A novel discrete model is introduced, and eccentricity fault is evaluated in both static and dynamic cases. To reach this aim, a numerical model is presented for slot openings, distributed windings and air‐gap, thereby computing the machine's inductances using MWFA. Power spectral density (PSD) of stator's current and machine's vibration are analyzed for static and dynamic eccentricity diagnosis and the finite element method (FEM) is utilized to precisely verify the proposed method. Mathematical‐based model with consideration of both slot openings and non‐sinusoidal winding function effects are the advantages of the proposed method over the previous researches in this field. Moreover, proposed method, which is based on mathematical modeling, could be easily applied to other types of electrical machines, and this feature is regarded as another key point of this paper. Copyright © 2016 John Wiley & Sons, Ltd.
Rapid Access to 2,2′‐Bithiazole‐Based Copolymers via Sequential Palladium‐Catalyzed C–H/C–X and C–H/C–H Coupling Reactions
Authors: Guo Qiang , Jiang Ruyong , Wu Di , You Jingsong 
Published: March 2016

A rapid access to 2,2′‐bithiazole‐based copolymers has been developed on the basis of the sequential palladium‐catalyzed CH/CX and CH/CH coupling reactions. To assemble a “copolymer” through homopolymerization, a type of symmetric A‐B‐A‐type building block is designed as the monomer and prepared via the regioselective C5H arylation of thiazole. A PdCl2/CuCl‐cocatalyzed oxidative CH/CH homopolymerization has been established to afford the 2,2′‐bithiazole‐based copolymers with high Mn (up to 69400). The current protocol features atom‐ and step‐economy and exhibits a potential in the highly efficient construction of conjugated copolymers.
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Compact bandpass filters based on linked hexagonal‐omega resonators
Authors: Sassi Imene , Talbi Larbi , Hettak Khelifa 
Published: March 2016

ABSTRACTA novel compact bandpass filter based on linked hexagonal‐omega resonators (LHORs) is presented. The proposed filter is realized by loading the LHORs to the microstrip line on the top of the substrate. The LHORs provides the possibility of designing bandpass filters with small size and simple structure. Two prototypes of filters were designed based on this structure. To validate the proposed prototypes, two‐cascaded and three‐cascaded bandpass filters using LHORs are simulated and fabricated. The proposed filters show a good pass‐band performance and a high out‐band suppression. The good agreement between the measured and the simulated results proves the excellent performance of the proposed filters. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1049–1052, 2016
Modified ground plane of patch antenna for broadband applications in C‐band
Authors: Jyoti Gogoi Pragyan , Jyoti Gogoi Dhruba , Bhattacharyya Nidhi S. 
Published: March 2016

ABSTRACTSlots are incorporated in ground plane of a simple rectangular patch antenna designed in C‐band on FR‐4 substrate with dielectric constant εr = 4.3 and height, h = 1.5 mm. The presence of slots shows multi frequency characteristics with enhanced bandwidth and directivity as compared to simple patch antenna without modified ground plane. The S11 parameter, impedance bandwidth, and radiation characteristics are studied for the antenna with and without modified ground plane. Two slots geometry shows three resonant frequencies with S11< −17 dB and enhancement in −10 dB bandwidth of 11.74% at 5.96 GHz. In three slots geometry, two resonant frequencies are observed with S11< −20 dB and enhancement in −10 dB bandwidth of 13.05% at 5.44 GHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1074–1078, 2016
Active resonator for low‐phase‐noise tunable oscillators
Authors: Stornelli Vincenzo , Pantoli Leonardo , Leuzzi Giorgio 
Published: March 2016

ABSTRACTIn this article an active tunable resonator with high Q factor is described, for the design of a tunable low‐phase‐noise oscillator. The resonator is based on an active inductor with simple topology and high performance. In spite of the intrinsic noise inherent in the active inductor, the phase noise of the oscillator is limited by the high Q of the resonator. Frequency tuning range in the order of 5% is obtained without any optimization. Guidelines for the design of the active inductor and resonator are given, together with a practical example of voltage‐controlled oscillator. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1032–1035, 2016
Introducing a radial absorbing boundary condition for the calculation of quality factor of whispering gallery resonators
Authors: Bagheri‐Korani E. , Mohammad‐Taheri M. 
Published: March 2016

ABSTRACTA one dimensional radial absorbing boundary condition (ABC) is introduced for the analysis of low order Whispering Gallery Mode (WGM) microresonators. Because the radiation of WGM is mostly in the form of radially outgoing waves, the employed ABC assumes that the absorbing material is anisotropic only in the radial direction. This formulation enables us to precisely calculate both the resonance frequency and quality factor of the WGMs. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1065–1068, 2016
Design of a side‐shielded wireless power transfer coil to achieve insensitivity against the human body effect
Authors: Lee Juneseok , Song Keum‐Su , Choi Jaehoon 
Published: March 2016

ABSTRACTWe propose a novel side‐shielded wireless power transfer coil for implantable medical devices. The side‐shielded coil consists of a resonator and a side‐shield structure, which is partially wrapped around the resonator. The side‐shield structure isolates the proposed coil from the human body effect and efficiently transfers power to the receiving coil. In addition, the proposed coil has a specific absorption rate approximately four times lower than that of a conventional spiral wireless power transfer coil. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1169–1173, 2016
Planar triple‐band balance‐shaped slot antenna
Authors: Ren Wang , Jiang Chen 
Published: March 2016

ABSTRACTA novel design of planar balance‐shaped slot antenna suitable for triple‐band WLAN/WiMAX applications is proposed in this article. It consists of a slotted ground plane, an FR4 substrate, and an L‐shaped microstrip feedline. The radiating element of the proposed antenna is composed of a horizontal H‐shaped slot and an M‐shaped slot, like a balance. The horizontal H‐shaped slot mainly contributes to the 2.4‐ and 3.4‐GHz resonant modes while the resonant modes at 5.4 and 5.8 GHz are generated by the M‐shaped slot. The overall size of the proposed antenna is only 30 × 28 mm2, very compact, making it easy to be integrated with other RF front‐end circuits. The measured results agree well with the simulated ones and demonstrate that the antenna has a triple‐band characteristic entirely covering the 2.4/5.2/5.8‐GHz WLAN and 2.5/3.5/5.5‐GHz WiMAX operating bands. Furthermore, monopole‐like radiation patterns with acceptable gains make it a good candidate as an internal antenna for WLAN/WiMAX applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1078–1082, 2016
Broadband circularly polarized fabry‐perot antenna integrated with wideband phase shifter for satellite communication
Authors: Qin Fan , Gao Steven , Wei Gao , Xu Jiadong 
Published: March 2016

ABSTRACTThis letter presents a broadband circularly polarized Fabry‐Perot (FP) antenna with high gain. A double‐layer partially reflective surface (PRS) with patch arrays with different sizes is employed. This proposed PRS can provide positive reflective phase gradient in a wideband frequency range, resulting in a significant improvement of 3‐dB gain bandwidth. To obtain the property of wideband circular polarization, a wideband microstrip patch antenna fed by a feeding network integrated with a broadband 90° phase shifter is applied as the primary source. A prototype operating at X‐band is fabricated and tested; whose 3‐dB gain bandwidth achieves 28.3% with the peak gain of 14.7 dBi. Moreover, its 3‐dB bandwidth of axial ratio (AR) can achieve 30% from 8.5 to 11.5 GHz. This antenna is a promising candidate for X‐band satellite communication due to its high gain, wideband AR, and fabrication simplicity. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1109–1113, 2016
Wideband coupler of folded half mode substrate integrated waveguide design with combined microstrip and stripline feed
Authors: Hong Wanchu , Ho Min‐Hua , Feng Jun‐Jia 
Published: March 2016

ABSTRACTThis article presents the 90° hybrid directional 3‐dB coupler design with a wideband performance. The main part of the proposed coupler is built on a folded half‐mode substrate integrated waveguide (FHMSIW) structure and the feed is composed of microstrip line and stripline. The FHMSIW is implemented by PCB technology which possesses the merits of compact size, low cost, light weight, low profile, high power handling capability, easy integration with planar transmission line, and possibly low insertion losses. In designing the circuit's feed, a quarter‐wavelength stripline is placed between the coupler's main part and each microstrip I/O port. The stripline works as an impedance transformer, which increases circuit's bandwidth (BW) and reduces the reflection. The acquired fractional bandwidth (FBW) is 47.2% with the coupler's central frequency set to 4.5 GHz. The averaged transmission and coupling losses are around 1 dB and the isolation is better than 20 dB. Experiment is conducted to validate the circuit performance. The measured data are in good agreements with the simulated ones. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1139–1141, 2016
A compact planar power combiner with complex impedance matching
Authors: Chen Te‐Chuan , Yu Xiaoju , Xin Hao 
Published: March 2016

ABSTRACTThis article presents a compact power combiner/divider for solid‐state amplifier applications inspired by spatial combiner. The proposed “one‐stage” combining structure is realized by a single port tapered to an oversized microstrip connecting to parallel multiport microstrip sections. By adjusting the geometries of the structure, uniform amplitude/phase, and complex impedance matching at the multiport outputs can be achieved. A prototype 1‐to‐4 divider/combiner is designed and characterized at 5 GHz. Measured and simulated results showed similar trend and decent agreement. The measured combining efficiency of the circuit is 82.44% at 5 GHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1121–1125, 2016
A novel sharp roll‐off microstrip lowpass filter with improved stopband and compact size using dual‐plane structure
Authors: Zhang Pingjuan , Li Minquan 
Published: March 2016

ABSTRACTA novel microstrip lowpass filter (LPF) with compact size is proposed to achieve sharp skirt characteristic and wideband suppression. The sharp transition and good passband performance of the proposed LPF is obtained by employing the defected microstrip structure, while the wide stopband is implemented by properly locating the open stubs, spurline, and dumbbell‐shaped defected ground structure. Both the simulation and measurement are conducted to verify the behavior of the proposed filter, and a good agreement between the measured and simulated results is observed. The experimental result of the fabricated filter shows that the attenuation rate reaches 159 dB GHz−1 and the stopband with good rejection level is obtained from 4.07 GHz to more than 15 GHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1085–1088, 2016
A wide band and high isolation microstrip line crossover using microstrip to ridge waveguide transitions
Authors: Sun Dongquan , Xu Jinping 
Published: March 2016

ABSTRACTIn this article, a wideband and high‐isolation microstrip line crossover using transition from microstrip line to ridge waveguide is proposed. The substrate is soldered to the ridge waveguide. One path of microwave signal propagates along the microstrip line on the substrate, while the other path is first coupled from the microstrip line to the ridge waveguide through a circular slot resonator and then coupled back to the microstrip line. The two paths of signals do not intersect with each other, which results in a high isolation. A prototype of the proposed microstrip line crossover working at center frequency of 11.6 GHz is designed, manufactured and measured successfully. The measured insertion loss of the path with transitions is better than 1.2 dB from 8 to 11.5 GHz and better than 2.2 dB from 11.5 to 15.3 GHz. The insertion loss of the microstrip path is better than 1 dB over the whole band from 8 to 15.3 GHz. The return losses of both paths are greater than 10 dB and the measured isolation of them is better than 37 dB. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1148–1150, 2016
Nonlinearity mitigation of multiband OFDM‐RoF optical transmitter using feed‐forward technique
Authors: Park Hyoung‐Joon , Jung Sun‐Young , Cho Seung‐Hyun , Lee Jong‐Hyun , Han Sang‐Kook 
Published: March 2016

ABSTRACTWe mathematically and experimentally demonstrate the nonlinearity suppression of optical transmitter in multiband orthogonal frequency division multiplexing based radio over fiber system (multiband OFDM‐RoF) by feed‐forward technique. The proposed method is a simple technique that can decrease static and dynamic nonlinear transfer characteristics. Nonlinearity of multiband OFDM‐RoF has been experimentally evaluated by transmitting nine optical OFDM channels. Experimental results show that nonlinear components from optical transmitter are suppressed and EVM is improved by 7.3% in multiband OFDM signal by using the proposed technique. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1236–1240, 2016
A novel textile antenna using composite multifilament conductive threads for smart clothing applications
Authors: Huang Jian‐Syuan , Jiang Tong‐Yang , Wang Zhi‐Xiang , Wu Sheng‐Wei , Chen Yen‐Sheng 
Published: March 2016

ABSTRACTThis letter proposes a wearable antenna fabricated by multifilament threads. The radiator is conductive threads filled with a copper wire, directly sewn onto a piece of cloth. Its advantages include better impedance matching, enhanced radiation efficiency, and additional value to smart clothing because the radiator is shaped into a logotype. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1232–1236, 2016
GPS/WLAN open‐slot antenna with a sticker‐like feed substrate for the metal‐casing smartphone
Authors: Wong Kin‐Lu , Wu Yu‐Ching , Wan Che‐Chi , Li Wei‐Yu 
Published: March 2016

ABSTRACTA multiband open‐slot antenna formed by placing a sticker‐like feed substrate (can also be a flexible printed‐circuit board) with the microstrip feedline and circuit elements disposed thereon onto a simple linear open slot embedded in the metal casing of the modern smartphone is presented. The proposed design provides a simple and convenient method in feeding an open‐slot antenna with multiband operation for the smartphone with a metal casing thereof having either a planar or smoothly curved surface. The linear slot has a short length of 23.5 mm and a narrow width of 1.5 mm and can be located 8 mm to the top or bottom edge of the metal casing. The linear slot is hence close to the short edge of the metal casing and will not be covered by the display panel therein. Such an open‐slot antenna is simple in structure and small in size, yet it can cover the GPS operation at 1.575 GHz and the 2.4/5.2/5.8‐GHz WLAN operation. The microstrip feedline printed on the feed substrate excites the open slot embedded in the metal casing, and the multiband (1.575/2.4/5.2/5.8 GHz) operation is obtained by the circuit elements disposed on the feed substrate. The circuit elements include a shunt capacitor loaded across the open slot and a parallel capacitor added to the microstrip feedline. Working principle of the applied circuit elements in obtaining the multiband operation is addressed. The antenna is also fabricated, and the experimental results are presented and discussed. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1226–1232, 2016
MIMO PCB‐integrated slot antenna for IEEE 802.11n WLAN access‐point applications
Authors: Lin Chun‐Cheng , Huang Chih‐Yu 
Published: March 2016

ABSTRACTA multiple‐input multiple‐output (MIMO) slot antenna integrated with a printed circuit board (PCB) is proposed for access‐point (AP) applications. The antenna comprises two square slot radiators fed by mutually orthogonal 50‐Ω microstrip lines. Through an appropriate adjustment of the antenna geometry parameters, a sufficient −10 dB return loss impedance bandwidth (∼21% at 2.43 GHz), a good radiating performance (i.e., high antenna peak gain values and stable radiation patterns), and a high isolation between the radiators can be achieved. The antenna is thus ideally suited for IEEE 802.11n (2.4 GHz) wireless local area network (WLAN) AP applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1254–1256, 2016
Buried metal detection within the wooden block by X‐band measurements
Authors: Helhel Selcuk , Kurnaz Osman 
Published: March 2016

ABSTRACTIn this article, Electromagnetic(EM) measurements campaign in controlled environment (antenna measurement laboratory) carried out to test, theories on EM bistatic scattering from buried metal detection has been presented. Both background signal subtraction algorithms and image processing techniques were applied. For each measurement, the brilliant area (BA), the ratio of pattern area(containing only non‐zero points) to the total scan area, has been calculated and formula relating BA with the width of the block, which is the distance from the front face of the block to the location where the metal is embedded, has been established. An average absolute error between calculated BA and measured BA is varying between 2.38% and 4.3%. We generated and proposed a mathematical model for estimating embedded depth, and measurement results are in good track with real one. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1245–1253, 2016
ESR study of molecular orientation and dynamics of TEMPO derivatives in CLPOT 1D nanochannels
Authors: Kobayashi Hirokazu , Furuhashi Yuta , Nakagawa Haruka , Asaji Tetsuo 
Published: March 2016

AbstractThe molecular orientations and dynamics of 2,2,6,6‐tetramethyl‐1‐piperidinyloxyl (TEMPO) radical derivatives with large substituent groups at the 4‐position (4‐X‐TEMPO) in the organic one‐dimensional nanochannels within the nanosized molecular template 2,4,6‐tris(4‐chlorophenoxy)‐1,3,5‐triazine (CLPOT) were examined using ESR. The concentrations of guest radicals, including 4‐methoxy‐TEMPO (MeO‐TEMPO) or 4‐oxo‐TEMPO (TEMPONE), in the CLPOT nanochannels in each inclusion compound (IC) were reduced by co‐including 4‐substituted‐2,2,6,6‐tetramethylpiperidine (4‐R‐TEMP) compounds at a ratio of 1 : 30–1 : 600. At higher temperatures, the guest radicals in each IC underwent anisotropic rotational diffusion in the CLPOT nanochannels. The rotational diffusion activation energy, Ea, associated with MeO‐TEMPO or TEMPONE in the CLPOT nanochannels (6–7 kJ mol−1), was independent of the size and type of substituent group and was similar to the Ea values obtained for TEMPO and 4‐ hydroxy‐TEMPO (TEMPOL) in our previous study. However, in the case in which TEMP was used as a guest compound for dilution (spacer), the tilt of the rotational axis to the principal axis system of the g‐tensor, and the rotational diffusion correlation time, τR, of each guest radical in the CLPOT nanochannels were different from the case with other 4‐R‐TEMP. These results indicate the possibility of controlling molecular orientation and dynamics of guest radicals in CLPOT ICs through the appropriate choice of spacer. Copyright © 2016 John Wiley & Sons, Ltd.
Implication of Rho‐kinase and soluble guanylyl cyclase enzymes in prostate smooth muscle dysfunction in middle‐aged rats
Authors: Calmasini Fabiano B. , Silva Fabio H. , Alexandre Eduardo C. , Rodrigues Renata L. , Barbosa Ana Paula L. , Ferrucci Danilo L. , Carvalho Hernandes F. , Anhê Gabriel F. , Pupo Andre S. , Antunes Edson 
Published: March 2016

AimsAging is highly associated with benign prostate hyperplasia (BPH). We investigated here the alterations of the contractile and relaxant machinery in prostates of middle‐aged rats, focusing on the Rho‐kinase, nitric oxide (NO)‐soluble guanylyl cyclase (sGC), α1‐ and β‐adrenoceptor pathways.MethodsMale Wistar young (3.5‐month old) and middle‐aged rats (10‐month old) were used. Quantitative image analysis of prostates and functional assays evaluating the prostate contractions and relaxations were employed. Measurement of [3H]‐noradrenaline efflux, western blotting for α1 and β1 sGC subunits, and cyclic nucleotide levels were carried out.ResultsProstates of middle‐aged rats showed significant increases in lumen and smooth muscle cells, but no alterations in the relative prostate weight were observed. In vivo, noradrenaline (10−7–10−4 g/kg) produced greater prostatic contractions in middle‐aged compared with control rats. Likewise, the in vitro contractions to phenylephrine (1 nM–100 μM) and α,β‐methylene ATP (1–10 μM) were greater in middle‐aged rats. Electrical‐field stimulation (EFS, 1–32 Hz) promoted higher [3H]‐noradrenaline efflux and prostate contractions in middle‐aged rats. Reduced expressions of α1 and β1 sGC subunits and diminished NO‐mediated prostate relaxations in middle‐age were observed. Isoproterenol‐induced relaxations and cAMP levels were reduced in prostates of middle‐aged rats. The Rho‐kinase inhibitor fasudil (50 mg/kg, 2 weeks) normalized the prostate hypercontractility in middle‐age rats.ConclusionsProstate hypercontractility in middle‐aging is associated with increased release of noradrenaline and Rho‐kinase pathway, as well as with impairments of NO‐sGC and β‐adrenoceptor pathways. Middle‐aged rats are suitable to explore the enhanced prostatic tone in the absence of prostate overgrowth. Neurourol. Urodynam. 36:589–596, 2017. © 2016 Wiley Periodicals, Inc.
Information‐based ranking of 10 compartment models of diffusion‐weighted signal attenuation in fixed prostate tissue
Authors: Liang Sisi , Panagiotaki Eleftheria , Bongers Andre , Shi Peng , Sved Paul , Watson Geoffrey , Bourne Roger 
Published: March 2016

AbstractThis study compares the theoretical information content of single‐ and multi‐compartment models of diffusion‐weighted signal attenuation in prostate tissue. Diffusion‐weighted imaging (DWI) was performed at 9.4 T with multiple diffusion times and an extended range of b values in four whole formalin‐fixed prostates. Ten models, including different combinations of isotropic, anisotropic and restricted components, were tested. Models were ranked using the Akaike information criterion. In all four prostates, two‐component models, comprising an anisotropic Gaussian component and an isotropic restricted component, ranked highest in the majority of voxels. Single‐component models, whether isotropic (apparent diffusion coefficient, ADC) or anisotropic (diffusion tensor imaging, DTI), consistently ranked lower than multi‐component models. Model ranking trends were independent of voxel size and maximum b value in the range tested (1.6–16 mm3 and 3000–10 000 s/mm2). This study characterizes the two major water components previously identified by biexponential models and shows that models incorporating both anisotropic and restricted components provide more information‐rich descriptions of DWI signals in prostate tissue than single‐ or multi‐component anisotropic models and models that do not account for restricted diffusion. Copyright © 2016 John Wiley & Sons, Ltd.