bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ku‐band compact bandpass filter with wide upper stopband using multilayer liquid crystal polymer technology
Authors: Shen Mengkui , Shao Zhenhai , You Chang Jiang , Ban Fangsheng 
Published: March 2015

ABSTRACTAn improved compact bandpass filter (BPF) with ultrawide upper stopband on three‐layer liquid crystal polymer substrate is presented. In this work, a broadside‐coupled H‐shape resonator and open circuited with radial stub are used to realize compact BPF. The first BPF is designed with three broadside‐coupled H‐shape resonators, which are placed on the top layer and middle layer, respectively. To improve the selectivity and reduce the size while not widen the bandwidth, an improved filter based on the first filter is proposed, which adds two open circuited with radial stubs and removing two H‐shape resonators. The measured results show that the second filter has better selectivity and much more compact size of 6 mm × 6 mm (about 0.52λg × 0.52λg) while keeping wide upper stopband and high rejection, comparing with the first filter, which size is 7 mm × 8 mm (about 0.61λg × 0.7λg). © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1121–1125, 2015
Compact coplanar waveguide bandpass filter based on coupled S‐shaped split ring resonators
Authors: Horestani Ali K. , Durán‐Sindreu Miguel , Naqui Jordi , Fumeaux Christophe , Martín Ferran 
Published: March 2015

ABSTRACTThis letter is focused on the application of coupled single‐layer S‐shaped split ring resonators (S‐SRRs) to the design of highly compact bandpass filters in coplanar waveguide (CPW) technology. S‐SRRs have been previously demonstrated as miniaturized resonators, particularly suited for applications in conjunction with coplanar line geometries. However, size reduction of CPW filters based on impedance inverters and S‐SRRs is limited by the inverters. Therefore, this letter proposes an alternative geometry of CPW bandpass filters employing S‐SRRs in a configuration based on the theory of coupled resonators. A highly compact third‐order bandpass filter is designed using this principle, and the proposed approach is validated through experiment, demonstrating competitive filter performance achieved in an extremely small area. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1113–1116, 2015
A wideband high selectivity filtering balun
Authors: Hao Zhang‐Cheng , Ding Wen‐Qi , Huo Xin‐Ping 
Published: March 2015

ABSTRACTThis letter presents a wideband planar multiple‐functional balun which simultaneously has balun and filtering response. By utilizing the geometrical symmetry character of substrate integrated waveguide bandpass filter, a wideband balun is developed with high selectivity. Multiple slots are etched on the bottom and top layers to improve the isolation performance of the proposed balun. As demonstrations, an X‐band filtering balun is designed and verified by experiments. Good agreements are obtained between simulated and measured results, which show that the measured filtering balun has an operation bandwidth from 8.7 to 11.7 GHz, that is, around 30.27% fractional bandwidth, a maximum 5.6 degree output phase imbalance, and a small insertion loss of 4.1 dB at center frequency of 10.2 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1107–1110, 2015
High performance tunable bandpass filter with separately reconfigurable passband edges
Authors: Zhang Bo , Li Shao‐Sheng , Huang J.‐M. 
Published: March 2015

ABSTRACTA high performance tunable bandpass filter (BPF) with separately reconfigurable passband edges is presented based on a novel varactor‐tuned stepped‐impendence stub‐loaded resonator. The proposed resonator consists of three variable capacitors and a half wavelength resonator loaded with three stepped‐impendence stubs symmetrically. Theoretical expressions have been derived for the resonant frequencies. Each passband edge can be reconfigured by adjusting capacitance values of the capacitors loaded on the stubs. High performances of the measured BPF are demonstrated, including low insertion loss (<1.9 dB), good return loss (>20 dB), a 16–49% fractional bandwidth tuning range and a wide upper stopband with better than 35 dB rejection. The proposed ideas are verified by the measured results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1111–1113, 2015
Multilayer multipermittivity ring dielectric resonator antenna filter
Authors: Jyani Ashok K. , Awasthi Seema , Biswas Animesh 
Published: March 2015

ABSTRACTThis article presents a multilayer multipermittivity (MLMP) ring dielectric resonator (DR) which is simultaneously used as a filter and an antenna, hence called dielectric resonator antenna filter. Multiple stacked layer of different permittivity along with the ring feature of DR gives a wideband response for antenna part with improved spurious response. In the presented MLMP ring DR, HEE11 and TE01δ modes are used for antenna and filter element, respectively. As HEE11 and TE01δ are orthogonal in nature that gives an independent control over filter and antenna characteristics. Measurement result reports an impedance bandwidth of 38.06% for dielectric resonator antenna (DRA) covering frequency range from 5 to 7.35 GHz for DRA and 3‐dB bandwidth is 211 MHz covering frequency range from 5.82 to 6.03 GHz for dielectric resonator filter (DRF). The measured resonance frequency is 5.38 and 5.93 GHz of DRA and DRF, respectively. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1147–1152, 2015
A CMOSUWBOOK pulse generator with multiple pulses per bit
Authors: Bae Yoon Jae , Cho Choon Sik , Kim Young‐Jin 
Published: March 2015

ABSTRACTThis letter demonstrates a CMOS impulse radio ultrawideband (IR‐UWB) on–off keying (OOK) generator with multipulses per bit generation. The proposed IR‐UWB OOK generator is implemented in 0.11 μm CMOS process where 1.33 mm2 proto‐type accomplishes pulse train of 250 Mbps for one bit duration while consuming 10 mW from 1 V supply voltage. This pulse generator complies with the FCC spectral mask for indoor UWB systems. It consists of impulse generator, LC oscillator, delay cell, and pulse shaping filter with which pulses are repeated in every 4 ns irrespectively of input data rates. The output pulse centering at 3.8 GHz provides multiple pulses per bit with 210 mVpp and 40 pJ/pulse energy consumption. Bandwidth based on −10 dB attenuation from the main beam is measured to be 0.65 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1177–1180, 2015
Polymer MMI coupler for millimeter wave demultiplexing
Authors: Herschel Reinhold , Bierwirth Christoph , Schäffer Christian G. 
Published: March 2015

ABSTRACTA multimode interference (MMI) millimeter wave demultiplexer is presented. It is based on image ridge waveguides made from standard polymers. CNC milling and 3D printing are demonstrated to form the device. At 80 GHz, an extinction of almost 60 dB is obtained for a first‐order MMI‐based polystyrene device. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1184–1187, 2015
Millimeter‐wave wide beamwidth aperture–coupled antenna designed by mode synthesis
Authors: Lee Chang‐Hyun , Lee Jeong‐Hae 
Published: March 2015

ABSTRACTIn this letter, a wide beamwidth aperture–coupled antenna is designed by mode synthesis at the millimeter‐wave frequency. To obtain the wide beamwidth, a TM010 mode and a zeroth‐order resonance mode of a metamaterial antenna are combined. A theoretical equation of synthesized radiation pattern is derived to find the conditions to obtain the widest E‐plane half power beamwidth (HPBW). By utilizing the equation, the optimal phase difference and injected power ratio to two antennas are found. The results are verified by a derived equivalent circuit and a full wave simulator. In addition, an aperture‐coupled feed that has an advantage to minimize the interference between a feed and an antenna has been used. Finally, the antenna with wide beamwidth is designed and fabricated at 35 GHz. The radiation efficiency and E‐plane HPBW of the designed antenna are simulated as 86.7% and 138°, respectively, which roughly agree with the measured results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1255–1259, 2015
Leaky‐wave antenna design using quarter‐mode substrate‐integrated waveguide
Authors: Lee Dongju , Lim Sungjoon 
Published: March 2015

ABSTRACTA leaky‐wave antenna (LWA) is designed using quarter‐mode substrate‐integrated waveguide (QMSIW). The LWA unit cell is miniaturized because the QMSIW size is quarter of SIW cavity. A traveling wave leaks away from open edges of the QMSIW. Its performance is verified with full‐wave simulation and measurements. The main beam direction varies from 0 to 28° when frequency varies from 12.5 to 15.4 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1234–1236, 2015
Comparison of reconstruction accuracy of sparse recovery algorithms for gapped RCS data
Authors: Bae Ji‐Hoon , Park Sang‐Hong , Kang Byung‐Soo , Kim Kyung‐Tae , Yang Eunjung 
Published: March 2015

ABSTRACTThis study evaluates and compares the reconstruction accuracy of sparse recovery algorithms (SRAs) when we reconstruct a two‐dimensional (2D) inverse synthetic aperture radar (ISAR) image from a gapped radar‐cross‐section (RCS) dataset. To analyze the influence of the gap on the reconstruction accuracy, we adopted a relative error (RE) in a 2D image domain, and evaluated the reconstruction accuracy of each method by calculating each RE value against the rate of missing data in the gap. The accuracy of the basis pursuit denoising method was better than that of other methods considered in this study, especially when we reconstructed the ISAR image from the gapped RCS dataset when signal‐to‐noise ratio was low. Consequently, the relaxed constraint rather than the strictly equality constraint for the SRA is more adequate for SRA applied to radar imaging. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1249–1255, 2015
Analysis and design of a branch‐line balun with high‐isolation wideband characteristics
Authors: Kim Phirun , Chaudhary Girdhari , Jeong Yongchae 
Published: March 2015

ABSTRACTThis article presents a design of wideband balun with high isolation using a branch‐line structure. Theoretical analysis of the proposed balun shows that the reflection coefficient characteristics with two transmission poles can be obtained by controlling the characteristic impedances of transmission lines (Zt, Z1, and Z2). The high isolation can be obtained by adding a shunt coupled‐line short stub and resistor (R) between the output ports. The proposed balun was designed at the center frequency (f0) of 2.6 GHz for a current‐mode class‐S amplifier application. The measured results were in good agreement with the simulations, showing that power division ratios were 3.09 dB and 3.14 dB, whereas the return loss was 21.39 dB at the f0and higher than 20 dB over a bandwidth of 0.98 GHz (1.98–2.96 GHz). The isolation between output ports was higher than 18 dB for the bandwidth of 0.75 GHz (2.21–2.96 GHz). The measured phase difference between the output ports was 180° ± 9° over a frequency range of 2.2–2.98 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1228–1234, 2015
Combined‐type triple‐wideband LTE tablet computer antenna
Authors: Wong Kin‐Lu , Tsai Chih‐Yu 
Published: March 2015

ABSTRACTA combined‐type triple‐wideband tablet computer antenna covering the long term evolution (LTE) operation in the 698–960 MHz (low band), 1710–2690 MHz (middle band), and 3400–3800 MHz (high band) is presented. The antenna is formed by an inverted‐F antenna (IFA) covering the LTE low band and a coupled‐fed loop antenna covering the LTE middle and high bands. The IFA (low‐band antenna) and coupled‐fed loop antenna (middle/high‐band antenna) are easily combined into a compact structure to occupy a small ground clearance of 10 × 30 mm2 and a thin thickness of 3 mm. Details of the antenna structure are described in this study. Working principle of the antenna to achieve the LTE triple‐wideband operation through combining the low‐band antenna and the middle/high‐band antenna is addressed. Experimental results of the fabricated antenna are also presented and discussed. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1262–1267, 2015
Triband filter with high design flexibility and wide stopband using DGS and shorted stub‐loaded resonator
Authors: Peng Biao , Li Shufang , Zhang Bo , Wang Shuai 
Published: March 2015

ABSTRACTIn this article, a novel triband bandpass filter with high design flexibility and wide stopband is designed by combining a shorted stub‐loaded resonator and two cross‐coupled DGS (defected ground structure) resonators [two RF (radio frequency) passages] with the same feeding structure. The three passbands can be flexibly designed not only because there is no cross‐coupling between the two passages but also because the harmonic passband can be easily eliminated just by embedding the feeding structure with open‐circuited stubs, while the performance of the three passbands remains the same. What's more, there are two transmission zeros beside each passband. A prototype filter with three passbands centered at 1.57, 3.45, and 5.28 GHz is designed and fabricated, and it behaves a wide upper stopband to about 9.6 GHz with rejection better than 20 dB. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1226–1228, 2015
On modeling of discrete propagation of localized damage in cohesive‐frictional materials
Authors: Haghighat E. , Pietruszczak S. 
Published: March 2015

SummaryIn this paper, the problem of propagation of localized deformation associated with formation of macrocracks/shear bands is studied in both tensile and compressive regimes. The main focus here is on enhancement of the constitutive law with embedded discontinuity to provide a discrete representation of the localization phenomenon. This has been accomplished by revising the formulation and coupling it with the level‐set method for tracing the propagation path. Extensive numerical studies are conducted involving various fracture modes, ranging from brittle to frictional, and the results are compared with the experimental data as well as those obtained using XFEM methodology. Copyright © 2015 John Wiley & Sons, Ltd.
Sorcery and the Moral Economy of Agency: An Ethnographic Account
Authors: Taylor John P. 
Published: March 2015

AbstractAn ethnographic account of sorcery accusation, violence, and subsequent community discussion provides a basis to explore the ‘moral economy of agency’ that shapes expressions and interpretations of personhood in Vanuatu. Mediated historically by transforming social, political, and economic circumstances, agency is demonstrated to be patterned according to culturally specific ontological and moral schemes. Key local categories of embodied personhood – including man ples (man place), man wan (man one), and jelus (jealousy) – are examined to elucidate two relationally entwined analytic categories, referred to as ‘distributive’ and ‘possessive’ agency. Such categories, it is argued, fundamentally shape expressions and interpretations of moral being and doing, including by providing a basis for identifying morally abject expressions of personhood. Taking seriously the important role of spiritual agency within such moral economies, this paper provides new ethnographically grounded insights into the ways in which communities and individuals negotiate moral being within transforming contexts of economic and sacred power.
‘I am Still a Young Girl if I Want’: Relational Personhood and Individual Autonomy in the Trobriand Islands
Authors: Lepani Katherine 
Published: March 2015

AbstractIn the Trobriand Islands of Papua New Guinea, sexuality is valued as a positive expression of relational personhood, registering the efficacy of consensual and pleasurable practice in producing and maintaining social relations. The power of sexuality to demonstrate individual and collective capacity and potential holds particular salience for unmarried young people. This paper draws on my ethnographic research on culture and HIV in the Trobriands to address perduring questions about the locus of individual autonomy in Melanesian sociality, where relational personhood shapes identity and modes of exchange in the moral economy. I focus on the gendered agency of youth sexuality, including the use of kwaiwaga, or love magic, in exercising and controlling desire. The narrative identities of two young women provide the lens through which questions of agency are explored, revealing how the autonomous mind, nanola, is central to understanding the embodiment of social relations, how the power of love magic transfers agency from one individual to another, and how individual assertions and acts are ultimately expressions of situated relationality.
Gender in a Land‐Based Theology
Authors: Tomlinson Matt 
Published: March 2015

AbstractInFijian Methodist discourse, thevanua(land and people) is often characterised as the foundation of the traditional order and all it entails. Indigenous theologians attend to thevanuain novel ways, especially as it is paired in a half‐complementary, half‐oppositional way toChristianity. The question of whether thevanuamight be understood in gendered terms highlights a gap between theoretically universal values and practically patriarchal norms. In this article,Idiscuss several innovative thinkers on this subject: (1) women in the ‘Weavers’ theological collective; (2) the Methodist theologian and former churchPresidentIlaitiaSevatiTuwere; and (3) a femaleMethodist minister,Tima, whomIinterviewed in 2009.Ifocus especially onTuwere's description of the ‘feminine face’ of thevanuaandTima's continual and wrenching conflict with the church's male‐dominated hierarchy. WhereasTuwere uses a quasi‐feministChristian theology to reconcileChristianity and thevanuain terms of gender,Tima implies that her experiences of conflict with older men demonstrate howChristianity and thevanuamight not be fully reconcilable.
‘Break Down These Walls’: Space, Relations, and Hierarchy inFijian EvangelicalChristianity
Authors: Morgain Rachel 
Published: March 2015

AbstractPatterns of sociality inFijian evangelicalChristianity differ from the mainlineFijianMethodist church in being notably less integrated with relations ofvanuaand chiefly hierarchy, leading scholars to speculate as to whether such traditions are more individualised. Analysing teachings, hymns, worship styles and spatial arrangements within a prominentFijianPentecostal ministry, I explore how sociality is produced through the interaction of spatial, conceptual, and embodied processes. Competing dynamics of hierarchy and equality, connections and boundaries, are mobilised within an overall framework that emphasises individual moral authority and personal relationship withGod. Through this analysis, in conversation with previous studies, this paper argues for a critical examination of schemes of ‘egalitarian individualism’ and ‘hierarchical holism’, which, through the influence ofLouisDumont in particular, have been prominent in studies ofChristianity and sociality inOceania.
Second malignant neoplasms among children, adolescents and young adults with Wilms tumor
Authors: Lee Jean S. , Padilla Benjamin , DuBois Steven G. , Oates Aris , Boscardin John , Goldsby Robert E. 
Published: March 2015

BackgroundThe goal of this study was to describe the incidence, characteristics, and outcomes of secondary malignant neoplasms (SMN) in survivors of Wilms tumor.ProceduresPatients who were 0–20 years of age at time of primary diagnosis with Wilms tumor and reported to the Surveillance, Epidemiology, and End Results [SEER] program between 1973 and 2011 were eligible for inclusion in the cohort. We used competing risks methods to estimate the cumulative incidence of SMNs and assess contributing factors for developing SMN. We estimated standardized incidence ratios (SIR), absolute excess risk and overall survival after SMN using standard methods.ResultsWithin the SEER database, 2,851 patients were diagnosed with Wilms tumor as their first malignancy. Of these, 34 patients were reported to have a SMN. Cumulative incidence of for a secondary malignancy was 0.6% (95% confidence interval [95% CI] 0.3–1.0%) at 10 years, 1.6% (95% CI 1.0–2.3%) at 20 years, and 3.8% (95% CI 2.4–5.9%) at 30 years. Median time from primary diagnosis to SMN diagnosis was 12.5 years. SIR for SMN for survivors of Wilms tumor was 3.4 (95% CI 2.2–4.9) with an absolute excess risk of 7.6 per 10,000 persons per year. Exposure to radiation did not significantly increase risk for development of second malignancy. Overall survival for patients with SMN was 64.5% at 5 years.ConclusionSurvivors of Wilms tumor are at an increased risk of SMN compared to the general population, but the added risk is relatively small compared to other pediatric cancers. Pediatr Blood Cancer 2015;62:1259–1264. © 2015 Wiley Periodicals, Inc.
Health related quality of life and perception of stigmatisation in adolescents living with sickle cell disease in Nigeria: A cross sectional study
Authors: Adeyemo Titilope A. , Ojewunmi Oyesola O. , Diaku‐Akinwumi Ijeoma N. , Ayinde Oluwaseyi C. , Akanmu Alani S. 
Published: March 2015

BackgroundSickle cell disease impacts the physical, emotional and psychological aspects of life of the affected persons, often times exposing them to disease associated stigma from the society and alters the health related quality of life (HRQoL). This study compared the HRQoL of adolescents with sickle cell disease with their healthy peers, identified socio‐demographic and clinical factors impacting HRQoL, and determined the extent and effects of SCD related stigma on quality of life.ProcedureWe conducted a cross‐sectional survey among 160 adolescents, 80 with SCD and 80 adolescents without SCD. Socio‐demographic and clinical data were collected using a pre‐tested questionnaire. HRQoL was investigated using the Short Form (SF‐36v2) Health Survey. SCD perceived stigma was measured using an adaptation of a perceived stigma questionnaire.ResultsAdolescents with SCD have significantly worse HRQoL than their peers in all of the most important dimensions of HRQoL (physical functioning, physical roles limitation, emotional roles limitation, social functioning, bodily pain, vitality and general health perception) except mental health. Recent hospital admission and SCD related complication further lowered HRQoL scores. Over seventy percent of adolescents with SCD have moderate to high level of perception of stigmatisation. Hospitalisation, SCD complication, SCD stigma were inversely, and significantly associated with HRQoL.ConclusionsAdolescents living with SCD in Nigeria have lower health related quality of life compared to their healthy peers. They also experience stigma that impacts their HRQoL. Complications of SCD and hospital admissions contribute significantly to this impairment. Pediatr Blood Cancer 2015;62:1245–1251. © 2015 Wiley Periodicals, Inc.
Donor–acceptor semiconducting polymers based on pyromellitic diimide
Authors: Kularatne Ruvini S. , Sista Prakash , Magurudeniya Harsha D. , Hao Jing , Nguyen Hien Q. , Biewer Michael C. , Stefan Mihaela C. 
Published: March 2015

ABSTRACTThree donor–acceptor copolymers P1, P2, and P3 with N,N′‐dodecylpyromellitic diimide as the electron‐acceptor unit with three diethynyl‐substituted donor monomers: 1,4‐diethynyl‐2,5‐bis(octyloxy)benzene, 2,7‐diethynyl‐9,9‐dioctyl‐9H‐fluorene, and 3,3′‐didodecyl‐5,5′‐diethynyl‐2,2′‐bithiophene have been synthesized by Sonogashira crosscoupling polymerization. The synthesized polymers showed deep highest occupied molecular orbital energy levels and larger band gaps (>2.5 eV). Polymers P1, P2, and P3 underwent fluorescence quenching with [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM), indicating the intermolecular photo‐induced charge transfer between the donor polymers and the PCBM acceptor. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1617–1622