bluuebunny/crossref_metadata_2025_split huggingface dataset:
A broadband Fabry–Pérot cavity antenna designed using an improved resonance prediction method
Authors: Kim Dongho , Ju Jeongho , Choi Jaeick 
Published: March 2011

AbstractWe have proposed a wideband Fabry–Pérot cavity (FPC) base station antenna for wireless broadband Internet (WiBro) service in Korea. To widen the radiation bandwidth of our antenna, unit cells printed on a superstrate have been gradually tapered according to a proposed linear tapering equation. Also, all openings in the lateral directions have been enclosed using four metallic sidewalls to enhance the overall performance of the antenna by reducing unnecessary wave leakage. Furthermore, the radiation aperture has been designed in a rectangular shape to create sharp and sectoral beam shapes in the elevational and azimuthal directions, respectively. For a more accurate determination of the FPC resonance, an improved prediction formula has been used. We have demonstrated the basic principle of bandwidth widening using higher mode behavior, which appears at a higher frequency region by means of tapered cells on the superstrate. In addition, to show the effectiveness of simple tapering of unit cells, we have compared the performance of two antennas covered with the tapered and uniform (nontapered) superstrate. Tapering the unit cells has expanded the fractional radiation bandwidth about four times wider than that of the antenna using uniform unit cells. The measured behaviors of our antenna are in good agreement with the simulated data, which confirms the validity of our design and analysis approach. The measured behaviors of our antenna are in good agreement with the simulated data, which confirms the validity of our design and analysis approach. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1065–1069, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25898
Bandpass filter using short stubs and step impedances lines for ultra‐wideband applications
Authors: Ryu Keun‐Kwan 
Published: March 2011

AbstractA bandpass filter is designed for the applications of ultra‐wideband (UWB) wireless communication.The designed bandpass filter covers the whole UWB passband of 3.1–10.6 GHz, and its construction is achieved by using a distributed high‐pass filter with frequent short‐circuited stubs and a low‐pass filter with step impedance lines. Within the whole UWB passband, the insertion loss lower than 1.65 dB and the group delay variation less than 0.27 ns are measured. This bandpass filter for UWB applications has the miniature size of 9.5 × 5.0 mm2, and the measured electrical performances have good agreement with simulation results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1062–1065, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25899
Fluorescence spectroscopy characterization of cadmium sulfide quantum dots on metal, insulator, and semiconductor substrates
Authors: Daniels‐Race Theda , Thiruvengadam Sathish 
Published: March 2011

AbstractColliodal cadmium sulfide quantum dots (Q‐CdS), ranging in size from 1 to 5 nm and capped with dioctyl sulfosuccinate (AOT), were synthesized and deposited upon substrates of gold (Au), mica, and gallium arsenide (GaAs). Fluorescence spectroscopy is used to identify the range and maxima of excitation and emission spectra of each structure. A red shift in emission spectra from the Au to mica to GaAs substrate based samples is observed for the smallest‐sized quantum dots. The midrange and largest‐sized dots display the longest emission wavelengths when physisorbed to the Au substrates with a shift to shorter and then longer emission wavelengths for the mica and GaAs‐based samples, respectively. The display of emission spectra throughout the visible range for the Q‐CdS deposited on all three types of substrates bodes well for future optical device applications using hybrid (organic–inorganic) electronic materials. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1018–1021, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25904
Polymer‐coated fiber Bragg Grating Sensor for cryogenic temperature measurements
Authors: Parne Saidi , Sai Prasad R. L. N. , Dipankar Sen Gupta , Sai Shankar M. , Kamineni Srimannarayana 
Published: March 2011

AbstractCryogenic temperature sensing has been demonstrated using Polymer coated Fiber Bragg Grating Sensor, and the experimental results are presented in this article. Teflon coating thicknesses of 20 and 40 μ applied on Fiber Bragg Gratings, inscribed in silica fiber (TFBG) are used for these studies. It was observed that the sensitivity of Teflon‐coated FBG has been enhanced three times compared to uncoated regular FBGs. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1154–1157, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25914
Compact size planar folded pifa design for mobile handset
Authors: Sim Chow‐Yen‐Desmond , Cheng Po‐Chun , Lee Ching‐Her 
Published: March 2011

AbstractA printed compact size folded inverted‐F antenna with simple configuration for mobile handset operating within the global system for mobile communication/personal communication system/digital communication system bands is initially proposed.To additionally cover the wireless local‐area network frequency spectrum at 2.4 GHz, a narrow stub is protruded from the printed shorting wall. The excitation of these operating bands with desirable bandwidth is achieved by feeding a 50‐Ω microstrip line to the folded radiating element through a via hole. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1045–1050, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25919
Quadrature phase‐shifted white‐light interferometry for the measurement of short‐cavity extrinsic fabry–perot interferometric sensors
Authors: Wang Gao 
Published: March 2011

AbstractA quadrature phase‐shifted white‐light interferometry is demonstrated to interrogate short‐cavity extrinsic Fabry–Perot interferometric (EFPI) sensors. The absolute cavity length of an EFPI can be recovered by constructing two quadrature signals using the white‐light spectrum of the EFPI. Experimental results show that the measurement resolution can be improved, and a linear output is obtained when interrogating an EFPI temperature sensor. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1011–1015, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25920
A simple stepped‐impedance transmission line load network for inverse Class F power amplifiers
Authors: Grebennikov Andrei 
Published: March 2011

AbstractIn this article, a novel simple load network with harmonic tuning, which is based on a stepped‐impedance transmission line is presented.Based on effect of a spectrum narrowing when poles of the reactance function are approaching adjacent zeros with higher transmission line impedance ratio, an open circuit at the second harmonic and a short circuit at the third harmonic are achieved, thus satisfying inverse Class F conditions. Design example of the load network with second and third harmonic tuning and effect of the device output shunt capacitance Cout and series inductance Lout with design equations are described and analyzed. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1157–1160, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25923
Vivaldi with tunable narrow band rejection
Authors: Hamid M. R. , Gardner P. , Hall P. S. , Ghanem F. 
Published: March 2011

AbstractA novel Vivaldi antenna is presented with tunable narrow band rejection characteristics within the overall operating bandwidth. A microstrip line resonator is incorporated within the Vivaldi antenna to give a narrow stop band action. Three varactors are loaded into the resonator and are used for tuning. The stop band can be activated in the frequency range between 2 and 7 GHz to give a very wide tuning ratio of 3.5:1. Good agreements between simulated and measured results are observed, which verify the design concepts. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1125–1128, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25924
Design of high‐permittivity rectangular dielectric resonator antenna
Authors: Madhuri R. G. , Hadalgi P.M. , Hunagund P. V. 
Published: March 2011

AbstractIn this article, a high‐permittivity rectangular dielectric resonator antenna is proposed. In this configuration, wideband operation is achieved by loading a rectangular dielectric resonator on the center of the rectangular ring slot. Dielectric resonators of three different thicknesses have been studied. In this configuration, slot acts as an effective radiator and the feeding structure of the dielectric resonator. The dual‐band resonances of the two radiators, i.e., slot and dielectric resonator are combined to extend the antenna bandwidth. The measured impedance bandwidth obtained is about 81.7%. The return loss, radiation pattern, and half power beam widths are measured and presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1077–1079, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25927
Switchable dual‐wavelength passively Q‐switched erbium‐doped fiber ring laser using nonlinear polarization rotation technique
Authors: Liu Jia‐Rui , Luo Zhi‐Chao , Luo Ai‐Ping , Yin Hai‐Sen , Xu Wen‐Cheng 
Published: March 2011

AbstractWe experimentally demonstrate a switchable dual‐wavelength passively Q‐switched pulsed operation in an Erbium‐doped all‐fiber ring laser utilizing the nonlinear polarization rotation technique.At a low pump power of 25 mW, Q‐switched pulse train possessing a temporal repetition rate of 12.7 kHz as well as a pulse width of 8.4 μs is generated stably with dual wavelengths centered at 1569.92 nm and 1587.28 nm. In addition, the switching operation between the two wavelengths can be facilely implemented by carefully adjusting the polarization controllers. Self‐mode‐locking effect is also observed and discussed. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1000–1003, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25930
Quasi optical phase shifter using cascaded split slot ring frequency selective surfaces
Authors: Euler M. , Fusco V. F. 
Published: March 2011

AbstractIn this article, a prototype X band scale model of a quasi‐optical phase shifter is characterized to demonstrate the utility of the architecture proposed. The prototype arrangement utilizes three double layer split slot ring frequency selective surfaces. It is shown experimentally that the transmission phase of an incident linearly polarized signal can be varied from 0 to 2 π radians over the frequency range of 9.5–10.3 GHz in a linear manner. Over this frequency range, the insertion loss of the assembly varies between 2.5 dB, at 10 GHz, to 6 dB at 9.6 GHz, while axial ratio varies between 25 dB to a worst case value of 5 dB. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:972–974, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25931
A compact CPW‐FED circular patch antenna with pattern and polarization diversities
Authors: Wei Kunpeng , Zhang Zhijun , Chen Wenhua , Feng Zhenghe 
Published: March 2011

AbstractA compact coplanar waveguide (CPW)‐fed microstrip antenna with pattern and polarization diversities is proposed in this article.By making use of even and odd modes of a CPW feed network, a circular patch antenna operating at TM11 and TM01 modes can be excited, which results in broadside and conical monopole‐like radiation patterns being achieved at an overlapping frequency range for 2.4GHz WLAN applications. The impedance bandwidth (VSWR ≤ 2) are 520 MHz (2.18–2.70 GHz, 21%) and 480 MHz (2.26–2.74 GHz, 20%) for broadside TM11 mode and conical TM01 mode, respectively. The measured isolation is better than 22 dB across the working bandwidth. The measured radiation pattern and gain of the proposed antenna are compared with simulation results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:968–972, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25932
A planar aperture‐coupled patch antenna implemented on dashboard foams for intra‐vehicle communication
Authors: Boeykens Freek , Doolaege Quinten , Declercq Frederick , Rogier Hendrik 
Published: March 2011

AbstractA robust low‐profile aperture‐coupled quasi‐circularly polarized patch antenna was designed for intra‐vehicle communication in the unlicensed 2.45‐GHz ISM band (2.4–2.485 GHz). As dashboards offer a large platform for invisible integration, the antenna is implemented using materials compatible with the production process of dashboards. This also allows easy, invisible, and low‐cost integration inside a car's dashboard. A measured gain of 6.437 dBi and nearly circular polarization were obtained with the antenna covered by the different dashboard layers. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1186–1189, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25933
Clonal selection algorithm application to simple microwave matching network
Authors: Deniz Ezgi , Ülker Sadik 
Published: March 2011

AbstractArtificial immune systems are classified as computational systems inspired by theoretical immunology and are mechanisms that can solve complex problems. Clonal selection algorithm is a selection algorithm, which is derived as a special selection algorithm to this artificial intelligence concept. In this work, Clonal selection algorithm is applied to design a simple microwave matching network for a load with arbirtary impedance. The results obtained were tested in a microwave simulator and indicated that clonal selection algorithm can be very effectively applied for microwave design problems. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:991–993, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25935
Compact dual‐band bandpass filter using octagonal split‐ring resonators with side‐coupled stubs
Authors: Liu H. W. , Shen L. , Guan X.H. , Huang D. C. , Lim J. S. , Ahn D. 
Published: March 2011

AbstractA compact dual‐band bandpass filter using side‐coupled octagonal split‐ring resonators (SRR) is introduced in this letter. The proposed filter employs two sets of SRRs operating at different frequencies to generate two passbands. Besides, the side‐coupled stubs provide sufficient degrees of freedom to control the bandwidth of the two passbands. Four transmission zeros can be created close to passband edges which leads to high skirt selectivity. Measured results are in good agreement with the EM simulation results. The circuit size of the proposed filter occupies only 22.4 × 12.6 mm2 (≈0.25 × 0.14 λg). © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1169–1171, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25938
Measurement and modeling of multiuser multiantenna system in aircraft in the presence of electromagnetic noise and interference
Authors: R. Sai Ananthanarayanan P. , Richards Alyssa Magleby , Furse Cynthia 
Published: March 2011

AbstractThis article evaluates the accuracy with which the performance of a multiuser multiantenna system can be predicted with and without considering cochannel interference and noise (Gaussian, α‐stable, and Cauchy) using a site‐specific three‐dimensional (3D) ray tracing algorithm as well as with statistical models with Gaussian and Nakagami‐m channel models in small to medium sized aircraft. These models expand on previous statistical channel models such as the hyper‐Rayleigh model by including the simultaneous effects of cochannel and adjacent channel interference, antenna matching, efficiency, directivity and polarization as well as (for the 3D model) site‐specific multipath effects. Measurements and comparisons are made in a metallic‐bodied Beech Baron BE 58P and a composite structure Rockwell T‐39 Sabreliner. It was found that the 3D ray tracing model provides a mean capacity within 1% of those measured in the two aircraft in the presence of interference and noise. This was closely followed by the Nakagami‐m distribution (m = 1.4), which was within 1–3% of measured capacity in the presence of interference and within 6% for a combination of interference and noise and the Gaussian model which was within 6% of measured capacity in the presence of interference and within 11% for a combination of interference and noise. The Cauchy noise degraded the capacity more than the other types of noise in the aircraft, providing a lower bound for capacity in an aircraft system. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1137–1144, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25939
Interferometry technique for refractive index measurements at subcentimeter wavelengths
Authors: Andrushchak N. A. , Syrotynsky O. I. , Karbovnyk I. D. , Bobitskii Ya. V. , Andrushchak A. S. , Kityk A. V. 
Published: March 2011

AbstractWe demonstrate the interferometry technique for the refractive index measurements at subcentimeter wavelengths. The method is based on a path length sweeping being introduced into one of the interferometer arms, while the sample is tilted out of its normal position with respect to the incident electromagnetic radiation. The determination of the refractive index is realized through the recording of the interference patterns at several tilt angles. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1193–1196, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25944
Efficient characterization of multilayered microwave wireless circuits on gyrotropic dielectric media including magnetized ferrites
Authors: Tounsi Mohamed Lamine , Yagoub Mustapha C. E. 
Published: March 2011

AbstractThe ever‐growing use of anisotropic ferrite devices in modern wireless communication systems highlighted the need for robust design tools to reliably characterize the dispersion behavior of such devices in radio frequency (RF)/microwave bands, especially for multilayered configurations. Indeed, as ferrites present a biaxial anisotropy, spectral analysis of multilayered configurations with such substrates is not generalized, however, restricted to some particular cases of tensors. Therefore, this article deals with the characterization of anisotropy effects on the dispersion parameters of multilayered wireless circuits with ferrite substrates, particular case of gyrotropic medias. In the proposed approach, a rigorous analysis was carried out by taking into account, for the first time, the electrical aspect of anisotropy. The computed results are in good agreement with those available in the literature. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:978–982, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25951
Multiple Sclerosis: Where Will We Be in 2020?
Authors: Miller Aaron E. 
Published: March 2011

AbstractThe past decade has seen a surge of research interest in multiple sclerosis and an accelerated expansion of investigative efforts into multiple sclerosis therapeutics. Investigators have continued dissecting the complex immunological perturbations that may contribute to the disease and made major advances in understanding the genetics of multiple sclerosis. This article addresses current investigative issues and offers predictions about where the understanding and treatment of multiple sclerosis may stand at the end of the 21st century's second decade. Mt Sinai J Med 78:268–279, 2011. © 2011 Mount Sinai School of Medicine
Targeting Oligodendrocyte Protection and Remyelination in Multiple Sclerosis
Authors: Zhang Jingya , Kramer Elisabeth G. , Mahase Sean , Dutta Dipankar J. , Bonnamain Virginie , Argaw Azeb T. , John Gareth R. 
Published: March 2011

AbstractMultiple sclerosis is an inflammatory demyelinating disease of the brain and spinal cord with a presumed autoimmune etiology. Conduction block in demyelinated axons underlies early neurological symptoms, whereas axonal transection is believed responsible for more permanent later deficits. Approved treatments for the disease are immunoregulatory and reduce the rate of lesion formation and clinical exacerbation, but are only partially effective in preventing the onset of disability in multiple sclerosis patients. Approaches that directly protect myelin‐producing oligodendrocytes and enhance remyelination may improve long‐term outcomes and reduce the rate of axonal transection. Studies in genetically modified animals have improved our understanding of mechanisms underlying central nervous system pathology in multiple sclerosis models, and have identified pathways that regulate oligodendrocyte viability and myelin repair. However, although clinical trials are ongoing, many have been unsuccessful, and no treatments are yet approved that target these areas in multiple sclerosis. In this review, we examine avenues for oligodendrocyte protection and endogenous myelin repair in animal models of demyelination and remyelination, and their relevance as therapeutics in human patients. Mt Sinai J Med 78:244–257, 2011. © 2011 Mount Sinai School of Medicine
Immunologic Aspects of Multiple Sclerosis
Authors: Boppana Sridhar , Huang Hui , Ito Kouichi , Dhib‐Jalbut Suhayl 
Published: March 2011

AbstractMultiple sclerosis is an inflammatory and degenerative disease of the central nervous system characterized by demyelination and axonal loss. Genetic and environmental factors contribute to the risk of immune dysregulation in multiple sclerosis. The review focuses on the immunopathogenic role played by various lymphocyte subsets and their cytokine products in the onset and disease progression, and the role of regulatory immune cells in disease remission. The mechanism of action of approved and experimental therapies, and how these mechanisms support the immunopathogenesis paradigm, is also reviewed. Mt Sinai J Med 78:207–220, 2011. © 2011 Mount Sinai School of Medicine
Increased prevalence of chronic fatigue among survivors of childhood cancers: A population‐based study
Authors: Jóhannsdóttir Inga M.R. , Hjermstad Marianne J. , Moum Torbjørn , Wesenberg Finn , Hjorth Lars , Schrøder Henrik , Mört Susanna , Jónmundsson Gudmundur , Loge Jon H. 
Published: March 2011

AbstractBackgroundFatigue is prevalent in adult cancer survivors but less studied in childhood cancer survivors. Aims were to assess fatigue levels, prevalence of chronic fatigue (CF) and the association of CF with health‐related quality of life (HRQoL) in survivors of acute myeloid leukemia (AML), infratentorial astrocytoma (IA), and Wilms tumor (WT) in childhood.ProcedureSeventy percent (398/567) of Nordic patients treated for AML, IA, and WT between 1985 and 2001 at age >1 year responded to a postal survey, encompassing the Fatigue Questionnaire and the Short Form 36 (SF‐36). Participants were divided into two groups at time of study; younger (YG, 13–18 years) and older (OG, 19–34 years). Respondents (19–34 years, n = 763) from a Norwegian general population (GP) survey served as controls for the OG.ResultsThe OG [mean age was 24 years (SD 3.3)] had higher fatigue levels compared to the YG and the GP, especially the females (P < 0.05). There was also a higher prevalence of CF in the OG than in the GP (14 vs. 6%, P < 0.001). Regardless of diagnosis, the OG with CF had poorer physical health (P < 0.05) on the SF‐36 but better mental health (P < 0.05 and P = 0.001) relative to controls with CF.ConclusionsThe prevalence of CF is higher among Nordic survivors of AML, IA, and WT than GP controls of similar age. CF is associated with impaired HRQoL in survivors. However, they reported better mental health than CF GP controls. This might indicate different underlying mechanisms of CF in the two populations. Pediatr Blood Cancer 2012; 58: 415–420. © 2011 Wiley Periodicals, Inc.