bluuebunny/crossref_metadata_2025_split huggingface dataset:
Compact Q‐band three‐conductors balun
Authors: Palombini Diego , Cavanna Tommaso , Arena Sergio , Limiti Ernesto 
Published: March 2016

ABSTRACTAn extremely compact Q‐band three‐conductors balun is presented. The proposed structure exploits the increased line‐to‐line coupling to improve bandwidth and impedance transformation. Furthermore the insertion of open‐ended stubs makes the circuit suitable for EHF mixer application. The balun operates in the 38–50 GHz range with a typical 1‐dB amplitude error and 10° phase unbalance. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1022–1025, 2016
Photoelectrical characteristics of TiO2‐N‐SI heterostructures
Authors: Kalygina V. M. , Egorova I. S. , Prudaev I. A. , Tolbanov O. P. , Atuchin V. V. 
Published: March 2016

ABSTRACTThe TiO2 thin films have been deposited onto Si epi‐layer‐covered Si substrates by magnetron sputtering of a TiO2 target. The influence of thermal annealing conditions on the photoelectrical characteristics of TiO2–n‐Si structures has been studied. The photoresistive effect is observed for the films annealed in Ar at T = 500°C and 750ºC. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1113–1116, 2016
Planar microstrip‐fed broadband circularly polarized antenna for UWB applications
Authors: Pratap L Bhanu , Kundu Debidas , Mohan Akhilesh 
Published: March 2016

ABSTRACTA microstrip‐fed UWB slot antenna with wide axial ratio is presented in this letter. The proposed antenna design comprises of an asymmetrical slot excited by an asymmetrical feed. The introduced asymmetrical nature alters the magnitude and phase of orthogonal E‐field components of the resonant modes generated. The asymmetry across the slot arms improves the axial ratio bandwidth (ARBW). The mechanism of obtaining circular polarization is discussed in detail and the steps taken for the improvement of ARBW is presented. The measured results of the proposed antenna have a wide impedance bandwidth (S11 < −10 dB) from 2.5 GHz to 12 GHz with ARBW of 81.1% (3.2 GHZ to 7.6 GHz). The antenna possesses the features like compact size (40 mm × 40 mm × 1.58 mm), low cost (FR4 substrate, ɛr = 4.4, tan δ = 0.02) and have easy integrability. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1088–1093, 2016
Dual stopband frequency selective surface by using half rings and slots
Authors: Hussein M. , Zhou J. , Huang Y. , Kod M. , Sohrab A. P. 
Published: March 2016

ABSTRACTIn this letter, a novel technique is proposed to design a dual stopband frequency selective surface (FSS) by combining a bandpass filter with its complementary structure in series. It displays flexibility to control the stopband frequencies which is the most attractive feature of this design. The proposed FSS filter is also very easy to fabricate, consisting of a single metal layer on a dielectric layer. A theoretical equivalent circuit model is proposed to characterize the structure. Explanation of the proposed filter response based on analysis of the equivalent circuit is discussed in detail. It is shown that the frequency response of the proposed FSS is almost the same for different incident angles. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1136–1139, 2016
A wideband wide‐angle ultrathin low profile metamaterial microwave absorber
Authors: Sood Deepak , Tripathi C. C. 
Published: March 2016

ABSTRACTA simple design of wideband wide‐angle ultrathin low profile metamaterial microwave absorber has been presented. The unit cell of proposed design is composed of an inclined metallic hexagonal patch printed on a grounded dielectric substrate. The simulation result shows 10‐dB absorption bandwidth of 5.02 GHz from 8.81 to 13.83 GHz and the FWHM bandwidth is 7.56 GHz from 8.17 to 15.73 GHz under normal incidence. The performance of the absorber has been investigated under different oblique angles and polarization angles of the incident wave. The absorption mechanism of the proposed absorber is analyzed through optimization of its geometrical dimensions, surface current, and electromagnetic field distributions. The proposed absorber is fabricated and then experimentally verified for different oblique angles and polarization angles of the incident wave. The designed absorber is low profile (unit cell size 0.21 λ0 at the center frequency), ultrathin (only λ0/17 thick) and provide more than 70% absorptivity for a bandwidth of 4.15 GHz for incidence angle up to 60°. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1131–1135, 2016
Miniaturized rat‐race hybrid incorporating six lumped‐element components
Authors: Tang Bo , Hayashi Hitoshi , Ueda Ryo 
Published: March 2016

ABSTRACTThis letter presents the simulation and measurement results for a miniaturized rat‐race hybrid using six lumped‐element components. The hybrid was implemented on an FR4 substrate using chip inductors and chip capacitors. For the 530‐ to 620‐MHz frequency range, the rat‐race hybrid exhibited power splits of −3.4 ± 0.7 dB, return losses of >18 dB, an isolation between output ports of >24 dB, and errors in the desired relative phase difference between output ports of <5°. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1125–1128, 2016
Systematic measurements of high isolation DC – 20 GHz miniature MEMS SPDT switch
Authors: Dey Sukomal , Koul Shiban. K. 
Published: March 2016

ABSTRACTA systematic measurement procedure of high isolation single‐pole‐double‐throw (SPDT) switch utilizing six metal contact switches using micro electromechanical systems (MEMS) is presented in this paper. A complete measurement procedure of a MEMS DC‐contact is outlined here including profile analysis, mechanical, electrical, switching/release time, temperature stability, power handling, intermodulation, IIP3, S‐parameter and reliability. Measured return loss of better than 20 dB with worst case insertion loss of 1.67 dB and isolation greater than 42 dB have been experimentally obtained from the SPDT switch up to 20 GHz within 1.25 mm2 area. Switch demonstrates temperature stability up to 70°C temperature and 0.1–1 W of RF power handling. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1154–1159, 2016
Bandpass frequency selective surface using asymmetrical slot four arms star geometry
Authors: Gomes Neto Alfredo , Costa e Silva Jefferson , Nogueira de Carvalho Joabson , da Costa Andrécia P. , de Moura Leidiane Carolina M. 
Published: March 2016

ABSTRACTIn this article, the authors proposed a bandpass frequency selective surface using the slot four arms star geometry. An expression to calculate the resonance frequency is introduced, for which results with difference <6%, when compared to measured ones, were obtained. The polarization dependence was discussed and a model based on two independent equivalent structures was successfully presented. Three prototypes were designed, fabricated, and characterized. A good agreement between simulated and measured results is observed. With the asymmetrical geometry, two bandpass bandwidths, separated by a notch band‐rejection, were achieved, a suitable characteristic to avoid co‐channel interferences. Furthermore, if an orthogonal polarization is applied, this notch band‐rejection can be converted to a bandpass bandwidth, providing a polarization filter behavior. The geometry simplicity and observed frequency response make the proposed FSS potentially attractive for many telecommunication systems. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1105–1109, 2016
A compact short‐ended zor antenna with gain enhancement using EBG loading
Authors: Gupta Ashish , Kumar Chaudhary Raghvendra 
Published: March 2016

ABSTRACTA new compact CPW‐fed short ended antenna based on composite right/left handed (CRLH) resonant approach is presented in this article. The antenna is operated in series resonant mode and therefore zeroth order resonating (ZOR) frequency can be driven by series elements of the conventional CRLH‐TL. Proposed antenna is basically a symmetric ground plane CPW‐fed antenna, comprises of meandered line inductor, connected between patch and CPW ground planes. Series gaps are provided by means of an octagonal shaped interdigital capacitor. Proposed antenna shows ZOR property at 2.58–2.68 GHz with 2.74 dB gain at 2.64 GHz. It has been observed that high level of miniaturization leads to lowering the antenna gain, therefore EBG structures are employed on the signal patch to improve the antenna gain. Proposed antenna radiated omni‐directionally in xz‐ plane while bi‐directionally in yz‐ plane with cross polarization level is as low as −30 dB. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1194–1197, 2016
Design, fabrication, and characterization of scaled and stacked layers metamaterial absorber in microwave region
Authors: Soheilifar M. R. 
Published: March 2016

ABSTRACTIn this article, the design, fabrication, and characterization of a new shape of metamaterial absorber was investigated at X‐band. The primary structure has a thickness nearly of λ0/120 at their resonance frequency. The simulated results show that absorptivity occurs at 10.312 GHz with peak absorbance value of 99.90%. The absorber exhibits, a response with full width at half maxima bandwidth 5.200%. By the suitable arrangement, we achieve the absorption for multi peaks of incident electromagnetic wave. The scalability property of metamaterials was utilized. Moreover, the present study investigated another method for broadening the absorption bandwidth, that is, structures with different geometrical parameters are staked in multi‐layered metamaterial absorbers. In all cases, the experimental results are in excellent agreement with simulation. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1187–1193, 2016
Design and simulation of Na2Nb4O11 dielectric resonator antenna added with Bi2O3 for microwave applications
Authors: Oliveira R.G.M. , Freitas D.B. , Romeu M.C. , Silva M.A.S. , Sales A. J. M. , Ferreira A.C. , Filho J.M.S. , Sombra A.S.B. 
Published: March 2016

ABSTRACTIn this paper is reported an experimental and numerical investigation of the microwave dielectric properties of Na2Nb4O11 (NN), ceramic matrix added with (0, 2, 5, and 10 wt%) of Bi2O3, obtained through a new procedure based on the solid‐state method. The experimental and theoretical characteristics of the resonator like return loss, bandwidth, input impedance are in good agreement. The simulations of radiation patterns are presented. For NN reference sample, frequency response bandwidth is of 43MHz (simulated) and 35MHz (experimental) for frequency operation around 2.28 GHz. The NN reference sample showed a dielectric permittivity around 58.4, with loss around 7.3 × 10− 3. The adding of bismuth oxide (2 and 5 wt%) reduced the value of the dielectric permittivity, otherwise the adding of 10 wt% increases its value. The temperature coefficient of resonant frequency (τf) was also measured for all dielectric samples. The values obtained were in the range of −3378 to −250ppm/°C. The results obtained confirm the necessity of producing composites of this material with others positive τf materials for obtaining dielectric resonator antennas with τf = 0. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1211–1217, 2016
An effective technique based on off‐set fed patch to enhance the bandwidth of microstrip planar antenna
Authors: Azim R. , Aldhaheri R. W. , Sheikh M. M. , Islam M. T. 
Published: March 2016

ABSTRACTIn this article a microstrip planar antenna with new bandwidth enhancement technique is proposed for broadband wireless communication. The antenna consists of a rectangular radiating patch, a fed line, and a conducting ground plane. To increase the operating band of a conventional microstrip patch antenna, the radiating patch is shifted from the center of the substrate (asymmetric) while the feed line is made as off‐set. It is observed that this asymmetric patch and off‐set feed line improve the impedance matching resulting in a bandwidth enhancement of more than 115% without changing of the overall antenna size. It is observed from the measurement that the proposed planar design with this technique can achieve an operating band ranging from 2.96 to 19GHz (146%) which makes it very suitable for a number of wireless communication applications such as WiMAX, WLAN, UWB, C‐band, X‐band, Ku‐band etc. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1221–1226, 2016
A K‐band push–push oscillator employing differential transmission line loaded with SIW cavity operated in TM110 mode
Authors: Li Zhipeng , Liu Yongzhi , Bao Jingfu 
Published: March 2016

ABSTRACTIn this letter, a novel differential transmission‐line (TL) loaded with circular substrate integrated waveguide (SIW) cavity is presented for realizing K‐band push‐push oscillator. The SIW cavity is working at TM110 mode to enforce the 180° phase difference between two sub‐oscillators, and the tuning metal vias perturbation is introduced in the SIW resonator to maximize the distance between desired odd TM110 mode and adjacent even modes to stabilize the oscillation mode. Unlike the conventional SIW resonator structure, this differential TL possesses a reflective‐type property at the resonance frequency. A 19.76 GHz push–push oscillator based on this differential TL is designed and implemented. The measured suppression of fundamental frequency component is −25.62 dBc, and the phase noise is −118.1 dBc Hz−1 at 1 MHz offset frequency, which corresponds to a figure‐of‐merit (FOM) of −191 dBc Hz−1. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1217–1221, 2016
Derivation of the optimum distance between periodically spaced vias for leakage suppression at S‐band
Authors: Eu Guan Chai , Yoshitomi Kuniaki , Kanaya Haruichi 
Published: March 2016

ABSTRACTIn this letter, the optimum center‐to‐center separation between vias in the conductor‐backed coplanar waveguide (CBCPW) is presented for leakage suppression in the dielectric region. Leakage mechanism at high frequencies associated with surface wave or parallel‐plate mode were widely studied in the past. In this work, antenna arrays have been used to compare leakage in CPW and CBCPW feed network at S‐band. By using identical antenna elements, CPW‐fed slot dipole antenna array has been compared against CBCPW‐fed slot dipole antenna array with a ground via fence. Instead of using shorting pins with minimum nonzero gap, optimum center‐to‐center separation distance between vias has been derived from the bandgap phenomenon. Approximately 20% of total loss across the frequency range of interest in CPW feed network obtained from the comparison of the CPW‐fed antenna array against the CBCPW‐fed antenna array can be attributed to unwanted leakage in the dielectric substrate. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1257–1260, 2016
Switchable slot dipole to tapered slot antenna for wideband and multi‐band applications with directional beam patterns
Authors: Chagharvand Sahar , Hamid M. R. , Kamarudin M. R. , Ghanem F. 
Published: March 2016

ABSTRACTThis article presents a slot dipole antenna switchable to tapered slot antenna for multiband and wideband operations. The antenna is designed to provide four modes of operation: namely wideband, single‐band, dual‐band, and triple‐band modes. These are achieved by activating/deactivating parts of the antenna structure by means of PIN diode switches, in order to form either a slot dipole or a tapered slot antenna. To guarantee a directional radiation of the antenna in all modes, V‐shaped slot is introduced and used in all modes. Five PIN diode switches are used. For demonstration purpose the wideband mode is designed around from 1 to 3 GHz. The resonance frequency of single‐band mode is designed at 2.4 GHz, whilst the dual‐band modes are at 2.1 and 3.2 GHz. The low, mid, and high frequencies of the triple‐band modes are at 1.5, 2.5, and 3.3 GHz, respectively. Return loss, radiation pattern, and gain of the fabricated antenna are in good agreement with the simulation results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1241–1245, 2016
Assessing multiple dimensions of urgency sensation: The University of South Australia Urinary Sensation Assessment (USA2)
Authors: Das Rebekah , Buckley Jonathan , Williams Marie 
Published: March 2016

AimsTo develop and assess structure, test–retest reliability, and discriminative validity of a self‐report questionnaire (University of South Australia Urinary Sensation Assessment: USA2) to assess multiple dimensions of urgency sensation.MethodsThe USA2 was designed and tested over two prospective, observational studies (2013–2014). Participants were English speaking Australians aged 50 or more with and without overactive bladder (OAB; determined by OAB awareness tool), recruited via health and recreation centers. In Study 1, exploratory factor analysis determined USA2 structure and subscales. In Study 2, confirmatory factor analysis reassessed structure; Mann–Whitney U‐tests determined discriminative validity (OAB vs. non‐OAB for subscale and total scores) with Cohen's d effect sizes. Thirty‐three individuals completed the USA2 twice; intraclass correlation coefficients (ICCs) and Wilcoxon signed rank tests assessed test–retest reliability.ResultsQuestionnaires were returned by 189 eligible participants in Study 1 and 211 in Study 2. Exploratory factor analysis revealed three subscales: “urgency,” “affective,” “fullness.” Confirmatory factor analysis supported these subscales. Subscale and total scores were significantly different between groups with and without OAB (P < 0.001). Cohen's d effect sizes (95%CI) were total score 1.8 (0.5–3.1), “urgency” subscale 1.8 (1.3–2.3), “affective” 1.7 (0.95–2.4), and “fullness” 0.75 (0.42–1.09). Total and subscales scores demonstrated test–retest reliability; ICCs (95%CIs) of 0.95 (0.9–0.98), 0.96 (0.92–0.98), 0.94 (0.88–0.97), and 0.78 (0.56–0.89).ConclusionsThe USA2 assesses multiple dimensions of urgency sensation, is reliable over a 2‐week period, and discriminates between older adults with and without OAB. Further validation is required in conditions other than overactive bladder. Neurourol. Urodynam. 36:667–672, 2017. © 2016 Wiley Periodicals, Inc.
THE EFFECT OF RECENT TAX CHANGES ON TAXABLE INCOME: CORRECTION AND UPDATE
Authors: Heim Bradley T. , Mortenson Jacob A. 
Published: March 2016

AbstractThis article is a Commentary on Bradley T. Heim (), The effect of recent tax changes on taxable income: Evidence from a new panel of tax returns,” Journal of Policy Analysis and Management, 28, 147–163. doi:10.1002/pam.20406. This note provides corrected estimates of the elasticity of taxable income to the net of tax share using a panel of tax returns that follows a random sample of taxpayers from 1999 to 2005, spanning the EGTRRA 2001 and JGTRRA 2003 tax changes. Two errors were corrected: the specification of income splines, and the subtraction of capital gains income from the dependent variable. Though the original results are largely robust to the first change, they are not robust to the second. The corrected estimates suggest that the elasticity of taxable income to the current year's net of tax share is small and statistically insignificantly different from zero.
Unique Familial MLL(KMT2A)‐Rearranged Precursor B‐Cell Infant Acute Lymphoblastic Leukemia in Non‐twin Siblings
Authors: Urtishak Karen A. , Robinson Blaine W. , Rappaport Eric F. , Sarezky Margaret D. , Biegel Jaclyn A. , Nichols Kim E. , Wilmoth Donna M. , Wang Li‐San , Stern Julie W. , Felix Carolyn A. 
Published: March 2016

BackgroundInfant acute lymphoblastic leukemia (ALL) has never occurred in families except for the ∼100% concordant cases in monozygous twins attributed to twin‐to‐twin metastases. We report the first kindred with infant ALL in non‐twin siblings. The siblings were diagnosed with MLL‐rearranged (MLL‐R) ALL 26 months apart. The second affected sibling had an unaffected dichorionic monozygous co‐twin. Both had fatal outcomes.ProceduresTranslocations were characterized by karyotype, FISH, multiplex FISH, and MLL breakpoint cluster region (bcr) Southern blot analysis. Breakpoint junctions and fusion transcripts were cloned by PCR. TP53 mutation and NADPH quinone oxidorecuctase 1 (NQO1) C609T analyses were performed, and pedigree history and parental occupations were ascertained. The likelihood of chance occurrence of infant ALL in non‐twin siblings was computed based on a binomial distribution. Zygosity was determined by single nucleotide polymorphism (SNP) array.ResultsThe translocations were not related or vertically transmitted. The complex karyotype of the proband's ALL had chromosome 2, 3, 4, and 11 abnormalities causing a 5′‐MLL‐AFF1‐3′ fusion and a non‐productive rearrangement of 3′MLL with a chromosome 3q intergenic region. The affected twin's ALL exhibited a simple t(4;11). The complex karyotype of the proband's ALL suggested a genotoxic insult, but no exposure was identified. There was no germline TP53 mutation. The NQO1 C609T risk allele was absent. The likelihood of infant ALL occurring in non‐twin siblings by chance alone is one in 1.198 × 109 families.ConclusionsWhether because of a deleterious transplacental exposure, novel predisposition syndrome, or exceedingly rare chance occurrence, MLL‐R infant ALL can occur in non‐twin siblings. The discordant occurrence of infant ALL in the monozygous twins was likely because they were dichorionic.
Analysis of Risk Factors for Abnormal Pulmonary Function in Pediatric Cancer Survivors
Authors: Record Elizabeth , Williamson Rebecca , Wasilewski‐Masker Karen , Mertens Ann C. , Meacham Lillian R. , Popler Jonathan 
Published: March 2016

BackgroundChildhood cancer survivors are at increased risk for pulmonary‐related morbidity and mortality. The Children's Oncology Group Long‐Term Follow‐Up (COG‐LTFU) guidelines recommend pulmonary function testing after treatment with bleomycin, busulfan, carmustine, lomustine, thoracic radiation, bone marrow transplant, or pulmonary surgery. The aim of this analysis was to determine the prevalence of pulmonary function abnormalities in a pediatric survivor cohort.ProcedurePatients ≥5 years old seen in our survivor clinic with at least one exposure outlined by COG‐LFTU Guidelines were included. Original pulmonary function test (PFT) results were obtained and blindly reinterpreted by a single reviewer. Demographic, diagnosis, treatment factors, and clinical and/or patient‐reported symptoms of cough, wheeze, and/or dyspnea were abstracted from their medical record.ResultsOverall, 143 (63.3%) survivors had PFT results available; 55.2% were male, 49.7% were white, and the mean age was 14.1 ± 4.8 years. Abnormal PFTs were found in 65.0% (n = 93) with 21.0% having multiple abnormalities. Specifically, 41.3% had hyperinflation, 25.9% had obstructive, and 13.3% had restrictive disease. Patients diagnosed at <5 years were more likely to have a pulmonary abnormality (P = 0.04); a majority of those diagnosed <5 years underwent pulmonary surgery or thoracic radiation. Regardless of the presence of a PFT abnormality, more than 80% of survivors were asymptomatic (82.9% vs.81.5%; P‐value = 0.54).ConclusionsAlmost two‐thirds of survivors screened per the COG‐LTFU Guidelines had an abnormal PFT but a majority reported no clinical symptoms. Hyperinflation was the most prevalent abnormality.