bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polyethylene Nanocomposite Heat‐Sealants with a Versatile Peelable Character
Authors: Manias Evangelos , Zhang Jinguo , Huh Jin Young , Manokruang Kiattikhun , Songtipya Ponusa , Jimenez‐Gasco Maria Mar 
Published: November 2008

AbstractA novel heat‐sealing performance is achieved by polyethylene (PE) nanocomposites reinforced by ethylene vinyl acetate (EVA) and montmorillonite (MMT). Appropriate nanocomposite design leads to hermetic seals with a general peelable/easy‐open character across the broadest possible sealing temperature range. Observations of the fracture seal surfaces by infrared spectroscopy and electron microscopy reveal that this behavior originates from a synergistic effect of the EVA copolymer and the montmorillonite clay nanofiller. Namely, the combination of EVA‐copolymers and MMT nanofillers provides sufficiently favorable interactions for nanocomposite formation and mechanical robustness, but weak enough interfacial adhesion to promote a general cohesive failure of the sealant at the EVA/MMT interfaces.magnified image
Genotype–phenotype correlates in Taiwanese patients with early‐onset recessive parkinsonism
Authors: Lee Ming‐Jen , Mata Ignacio F. , Lin Chin‐Hsien , Tzen Kai‐Yuan , Lincoln Sarah J. , Bounds Rebecca , Lockhart Paul J. , Hulihan Mary M. , Farrer Matthew J. , Wu Ruey‐Meei 
Published: November 2008

AbstractWe screened for mutations in the PARKIN, DJ‐1, and PINK1 genes in a Taiwanese cohort (68 probands; 58 sporadic and 10 familial) with early‐onset parkinsonism (EOP, onset <50 years of age). We identified 9 patients harboring mutations in PARKIN (three compound heterozygous and six single heterozygous carriers), 3 patients with heterozygous PINK1 mutations (including two novel substitutions M341I and P209A), and no DJ‐1 mutations. Our frequencies of PARKIN (two allele mutation, 4.4%; single allele, 8.8%) and PINK1 (single heterozygous, 4.4%) mutations in Taiwanese–Chinese are similar to those in Caucasian and other Asian EOP patients. Although the role of heterozygosity of recessive genes in EOP remains to be resolved, molecular analysis and functional imaging will play a decisive role in differential diagnosis and determined therapeutic strategy. © 2008 Movement Disorder Society
Gait and balance in essential tremor: Variable effects of bilateral thalamic stimulation
Authors: Earhart Gammon M. , Clark B. Ruth , Tabbal Samer D. , Perlmutter Joel S. 
Published: November 2008

AbstractEssential tremor (ET) is a multi‐faceted condition best known for postural and action tremor but also may include disordered gait and postural instability. Deep brain stimulation (DBS) of the ventral intermediate nucleus (VIM) of the thalamus provides substantial tremor reduction yet some patients with bilateral VIM DBS have gait and balance impairment. This study examines gait and balance performance in 13 participants with ET who have bilateral VIM DBS compared with a matched control group. Participants with ET were tested with their stimulators off (DBS OFF) and on (DBS ON). For both standard and tandem walking, participants with ET walked significantly more slowly than controls, with significantly lower cadence, spending a lower percentage of the gait cycle in single limb support and a higher percentage in double support compared with controls. Participants with ET also had significantly lower tandem and one leg stance times, Berg balance scores, balance confidence, and required significantly greater time to perform the Timed Up‐and‐Go relative to controls. There were no significant differences in any gait or balance measures in the DBS OFF versus DBS ON conditions, but the effects of DBS on gait and balance were highly variable among individuals. Future studies are needed to determine why some individuals experience gait and balance difficulties after bilateral thalamic DBS and others do not. A better understanding of the mechanisms underlying gait and balance impairments in those with bilateral DBS is critical to reduce falls and fractures in this group. © 2008 Movement Disorder Society
A novel wideband diversity antenna for mobile handsets
Authors: Cai Yaxing , Du Zhengwei , Gong Ke 
Published: November 2008

AbstractA novel wideband printed diversity antenna for mobile handsets is proposed and studied. The antenna consists of two monopoles with symmetric configuration. The effects of some parameters of the proposed antenna are studied. The measured relative bandwidth reaches to 29.0% (1860–2490 MHz) with acceptable isolation over the bandwidth. The measured radiation patterns of the two monopoles cover complementary space regions. The diversity performance is approximately calculated, and the results show that the proposed antenna can provide spatial and pattern diversity. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 218–222, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23948
Self‐equalization technique for distributed quasi‐circulator
Authors: Mung Steve W. Y. , Chan Wing Shing 
Published: November 2008

AbstractA self‐equalization technique for an active quasi‐circulator is proposed. It is formed using distributed amplifiers, which show how it achieves wideband frequency operation without the use of additional phase shifters. Experimental results show that it can operate over the frequency range 0.8–2.2 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 182–184, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23949
Shape reconstruction of an inhomogeneous impedance cylinder via potential and neural network approach
Authors: Yaman Fatih , Şimşek Serkan 
Published: November 2008

AbstractIn this article, a hybrid method is presented to reconstruct two‐dimensional shape of an inhomogeneous impedance cylinder from the noisy far field data in the case of single electromagnetic plane wave illumination. The proposed reconstruction method can also be applied for complex‐shaped smooth objects having different type of boundary conditions. For the solution of the direct problem, a potential (layer) approach is chosen that leads to a boundary integral equation. Applying Nyström method to the equation, an exponential convergence is obtained. The inverse scattering problem is solved via neural network approach, which is a stable technique under considerable level of noise. The applicability and the effectiveness of the proposed method are supported by numerical examples, and the proposed approach provides reconstructions which are in good agreement with the actual shapes. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 119–124, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23953
Quasi‐elliptic function filters with a dual‐passband response with high‐permittivity ceramics substrate
Authors: Huang Cheng‐Liang , Chen Yuan‐Bin , Lee Meng‐Lin 
Published: November 2008

AbstractThe miniaturization of dual‐passband filters by employing two high‐permittivity ceramic substrates (with respective dielectric constants of 4.5 and 20.8) are investigated. Microwave dielectric ceramics with high permittivity are commonly applied in several microwave communication components. With the advantages of compact size, high‐permittivity ceramics can be used as the substrate for dual‐passband filters. Moreover, the fundamental characteristics of newly developed compact stepped impedance resonator (SIR) have also been described and applied to the design of band‐pass filters. In this article, the designed ring resonators structures are simulated using an IE3D simulator. The responses of the fabricated dual‐passband filters using FR4 (εr= 4.5, Q × f = 350,000 GHz) and 0.96 Mg0.95CoTiO3–0.04SrTiO3with 1 wt% ZnO addition (εr= 20.8, Q × f = 74,000 GHz) ceramic substrates are designed at the center frequency of 2.4/5.2 GHz. This compact size, low loss dual‐passband filter should be useful in many wireless communication systems. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 245–248, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23962
An octagonal UWB monopole antenna with 5 GHz band‐notch function
Authors: Sim Chow‐Yen‐Desmond , Chung Wen‐Tsan , Lee Ching‐Her 
Published: November 2008

AbstractIn this article, an octagonal monopole antenna embedded with three slits in the ground plane is proposed. Its ultra‐wideband (UWB) operation within the required frequency (3.1–10.6 GHz) is fine tuned by embedding a small rectangular slit at the top center of the ground plane, whereas the band‐notch function is achieved by embedding two symmetrical L‐shaped slits located at both sides of the ground plane. The gain and time‐domain characteristics of this antenna show that it is applicable to any wireless communication system that requires a stable signal transmission in the 5‐GHz notch‐band‐excluded UWB. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 74–78, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23971
A novel microstrip UWB bandpass filter with CPW resonators
Authors: Chen H. , Zhang Y.‐X. 
Published: November 2008

AbstractA new and compact ultra‐wideband (UWB) bandpass filter (BPF) using hybrid microstrip/coplanar waveguide (CPW) structure is proposed. The presented filter has been designed, fabricated, and measured for UWB system. Measured results demonstrated the UWB properties from 3.1 to 8.9 GHz (−3 dB bandwidth), which is fractional bandwidth of 96% at the center frequency 6.0 GHz. The filter also exhibits a sharper slop response at the lower passband edge than that reported in the article (Thomson and Hong, IEEE Microwave Wireless Compon Lett 17 (2007) 184–186), and deeper and wider stop‐band rejection than that reported in the article (Thomson and Hong, IEEE Microwave Wireless Compon Lett 17 (2007) 184–186; Li et al., IEEE MTT‐S Int Dig 2005, 675‐678) at the higher passband edge. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 24–26, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23977
Wideband cylindrical monopole antenna for multiband wireless applications
Authors: Chun Joong‐Chang 
Published: November 2008

AbstractA wideband cylindrical monopole antenna is presented for multiple band applications. Wideband property of the proposed antenna is achieved by the additional resonance from a stepped base part and a convex ground plane. The measured −10 dB impedance bandwidths are 1.74–3.06 and 5.59–10.62 GHz, which can cover various kinds of wireless services such as PCS (1.75–1.87 GHz), IMT‐2000 (1.92–2.17 GHz), WiBro (2.3–2.39 GHz), WLAN (2.412–2.483 GHz, 5.725–5.825 GHz), DMB (2.63–2.655 GHz), and high‐band UWB in Korea (7.2–10.2 GHz). © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 15–17, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23981
A novel microstrip‐fed ultrawideband triangular monopole antenna with wide stubs
Authors: Choi Sung Tae , Hamaguchi Kiyoshi , Kohno Ryuji 
Published: November 2008

AbstractA novel small size microstrip‐fed monopole antenna with wide bandwidth and small group delay variation is proposed for ultrawideband (UWB) applications. It consists of a triangular patch with a pair of wide stubs on the lower sides thereof and linearly tapered partial ground plane on the backside. The measured return loss of the fabricated antenna is better than −9 dB from 2.9 to 12 GHz. The radiation pattern is nearly omnidirectional, and the variation of the measured group delay between two proposed antennas is less than 1.6 ns over the entire UWB band. A good agreement is observed between measured and simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 263–266, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23989
Design of a compact branch‐line coupler using capacitance loading
Authors: Jing Tao , Shi Xiao‐Wei , Guo Yu‐Chun , Chen Lei , Chen Xiao‐Qun 
Published: November 2008

AbstractThis article presents a compact branch‐line coupler (BLC) for balanced‐type circuit application. It was designed by utilizing cascading multisection and capacitance‐loading technique for bandwidth increase and size reduction individually. The proposed BLC was simulated and fabricated. Its physical length reduces by 28.7%, while it performs as good as the conventional one. The simulated and the measured results have a good agreement. The method is valid for compact and good performance BLC design. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 198–200, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23992
Double‐layered coplanar patch antenna on CaLa4Ti5O17high‐permittivity substrate with coplanar waveguide feed line
Authors: Chen Yih‐Chien , Zeng Yu‐Wei 
Published: November 2008

AbstractIn this article, the measurement results for the double‐layered compact coplanar patch antenna with coplanar waveguide feed line at 2.5 GHz has been presented. With this technique, a 3.6% bandwidth (return loss < −10 dB) of center frequency at about 2.5 GHz has successfully been achieved. The copolarization radiation is strongest at θ ≅ 0° and 20° from the broadside in the xz‐ and yz‐planes, respectively. The antenna has a 3 dB beam angle of about 90°. Peak antenna gain is about 4.4 dBi, with gain variations less than 1.0 dBi for frequencies within in the −10‐dB S11bandwidth. From the measured return loss, it was demonstrated that the bandwidth of coplanar patch antenna printed on CaLa4Ti5O17high‐permittivity substrate with coplanar waveguide feed line on FR4 substrate can be improved compared with conventional patch antenna. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 98–100, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23998
Theory of the spherical generalized Smith chart
Authors: Wu Yongle , Zhang Yaxing , Liu Yuanan , Huang Haiyu 
Published: November 2008

AbstractAs a complement for the spherical representation of the Smith chart, this letter extends the previous work by giving the exact mathematical expressions of the spherical Smith chart and the spherical generalized Smith chart. Rigorous derivations and typical illustrations are also provided to support the theory. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 95–97, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23999
Characterization of photoconductive semiconductor switches under nonlinear mode condition
Authors: Ruan Chi , Zhao Wei , Zhu Shao‐Lan , Liu Hong‐Jun , Yang Hong‐Chun , Ruan Cheng‐Li 
Published: November 2008

AbstractA photoconductive semiconductor switch (PCSS) would work in a nonlinear mode under high biased electrical field. The experimental results of nonlinear critical state have shown that both the biased voltage and the laser energy may have working thresholds to turn on the nonlinear modes. The relation between the biased voltage and the laser energy is inverse ratio, i.e., higher biased field need lower laser energy for nonlinear mode, and vise versa. At the nonlinear critical point, the output of PCSS is unstable, as both the linear and nonlinear pulse may occur. As the laser energy and biased field increase, the PCSS would work in the nonlinear mode steadily. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 56–59, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24001
Band‐notched UWB printed antenna with an inverted‐L‐slotted ground
Authors: Jiang Jun‐Bo , Song Yue , Yan Ze‐Hong , Zhang Xin , Wu Wei 
Published: November 2008

AbstractA novel printed antenna having a frequency band‐notched function for UWB applications is proposed and studied. With a pair of inverted‐L‐shaped slots introduced around the microstrip line on the ground, a frequency‐notched response at 5.2 GHz is obtained. The designed antenna satisfies the VSWR requirement of less than 2.0 in the frequency band between 2.8 and 10.7 GHz while showing the band rejection performance in the frequency band from 4.8 to 5.7 GHz. Good monopole‐like radiation patterns and antenna gains have also been obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 260–263, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24003
A new ultra wideband aperture coupled microstrip antenna
Authors: Ghassemi N. , Rashed‐Mohassel J. , Neshati M. H. 
Published: November 2008

AbstractThis letter presents a new aperture coupled microstrip antenna with a nonsymmetric U‐shaped feed line and two rectangular slots on the ground plane. Simulation results show that the antenna has VSWR <2 from 10.5 to 22 GHz and the simulated gain bandwidth (above 7 dB) of the antenna is 6.6 GHz (47%). Good agreement is obtained between simulation and experimental results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 259–260, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24004
The three symmetric power divider ports, compact, fixed, and tunable based on micro‐strip technology
Authors: Jrad A. , Safarjalani T. , Duchamp J.‐M. , Ferrari P. , El‐Helwani A. 
Published: November 2008

AbstractWe produced three symmetric power divider ports, compact, fixed, and tunable based, with hybrid technology by using capacitors CMS or commercial diode varactors, at low costs. These dividers consist of an impedance transformer in the shape of T in entry and by two transmission lines with an impedance of 50 Ω on the two output ports. The impedance transformer contains a transmission line with electrical length θ1, a fixed capacitor C or variable (diode), and another transmission line with electrical length θ2. We designed these power dividers at working central frequencies 900 and 1800 MHz for GSM applications by using two substrates: Epoxy and RO4003. The band pass should be higher than 20% around central frequency for a good adaptation (S11< −20 dB) and also for losses lower than 0.3 dB. The size of our dividers is more than two times shorter than a classical Wilkinson power divider. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 229–232, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24005
Systematic design and realization of the optical feedforward transmitter based on microwave circuit modeling
Authors: Moon Yon‐Tae , Jang Jun Woo , Lee Tae‐Kyeong , Kim Do‐Gyun , Park Ho‐Hyun , Kang Tae‐Gu , Han Sang‐Kook , Choi Young‐Wan 
Published: November 2008

AbstractWe have systematically designed and realized the optical feedforward transmitter using microwave circuit model of distributed‐feedback laser diode (DFB LD) based on rate equations. Through the system‐level simulation for the optical feedforward method, the nonlinearity of DFB‐LD is analyzed, and the optimized characteristics of the RF components in the system are confirmed by using a microwave simulator. The experimental and simulated results show the reduced distortion products and enhanced spurious‐free dynamic ranges are in good agreement at 2.4 GHz. These results are analyzed as the evaluation parameters for the miniaturization and optimization of the feedforward compensation method in radio‐over‐fiber systems. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 192–195, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24007
Extended reciprocity‐based computation of mutual admittance between CPW‐fed slots on conductor‐backed two‐layer substrates
Authors: Jacobs Jan P. , Joubert Johan , Odendaal Johann W. 
Published: November 2008

AbstractAn extended reciprocity‐based formulation for finding mutual admittance between coplanar waveguide fed slots on conductor‐backed two‐layer substrates was presented. The formulation updates the field distribution in both slots iteratively to account for coupling interaction between slots. This is especially relevant for cases of high mutual coupling. The results agree well with moment method‐based calculations. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 91–94, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24012
Design of CPW‐fed monopole UWB antenna with a novel notched ground
Authors: Zhang Xin , Wu Wei , Yan Ze‐Hong , Jiang Jun‐Bo , Song Yue 
Published: November 2008

AbstractA novel CPW‐fed monopole UWB antenna is presented in this article. To increase the impedance bandwidth, a notched ground is introduced. The parameters and the characteristics of the antenna are given. The optimized antenna presents 3.8:1 ratio bandwidth and 116.7% impedance bandwidth for VSWR less than 2. Simulations and measurements are presented for the proposed antenna. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 88–91, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24013
Novel compact ultra‐wideband filter with wide stop‐band
Authors: Hu Hong‐Hong , Xiao Zhong‐Yin , He Wen‐Qing , Gao Shan 
Published: November 2008

AbstractOne novel compact ultra‐wideband filter having high‐frequency selectivity and wide stopband is developed by using microstrip stub‐loaded dual‐mode resonator couples. Open stub‐loaded and short stub‐loaded are used to widen the passband of filter without aperture‐enhanced coupled line structure. Five transmission poles in the passband are shown. Two sharp attenuation poles can be located close to either side of the desired pass band. And the other two attenuation poles can be located in the stopband of upper frequencies, so as to reject the third resonant modes of stub‐loaded resonators. The passband of filter and the locations of attenuation poles can be controlled by the sizes of the open stub and short stub. The measured results demonstrate that the insertion loss is lower than 1.0 dB in the passband (3.9–11.6 GHz), higher than 15.0 dB in the upper‐stopband (12.0–19.5 GHz), whereas the group delay variation in the passband is less than 0.5 ns. The measured result agrees well with the EM simulation. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 53–55, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24014
Efficient electrically small loop antenna using SRR structure on the ground plane
Authors: Kim Joong‐Kwan , Kim Yong‐Jin , Kim Ho‐Yong , Lee Hong‐Min 
Published: November 2008

AbstractIn this article, an electrically small loop antenna using capacitive loading is proposed. The loop antenna acts as an inductive element and the gap between two lines of SRR in the ground plane acts as a capacitive element; hence the combined system with these two elements is operated as a LC resonator. The equivalent circuit model of the antenna structure is applied to analyze and qualify the design correctness. Although the proposed antenna has a very small size, it shows a good performance. The measured maximum gain and radiation efficiency of the fabricated antenna at the frequency of 2.04 GHz are 3.6 dBi and 81.02%, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 201–204, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24016