bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and Characterization of a Telechelic Peptide as a Precursor for Supramolecular Networks
Authors: Federico Stefania , Lendlein Andreas , Neffe Axel T. 
Published: December 2011

AbstractA peptide showing propensity for the adoption of β‐sheet conformation was synthesized in order to develop a defined molecular building block as part of a toolbox for the development of polymer networks based on supramolecular interactions. The peptide was synthesized by microwave‐assisted solid phase peptide synthesis and the purification was performed by Reversed Phase‐High Performance Liquid Chromatography (RP‐HPLC), from which a purity higher than 95 mol‐% was obtained. The calculated mass was confirmed by Matrix Assisted Laser Desorption Ionization‐Time of Flight‐Mass Spectrometry (MALDI‐ToF‐MS). Further characterization of the peptide was performed by IR and 2D TOCSY, NOESY, and HSQC NMR spectroscopy, which confirmed the identity and the sequence of the peptide.
Age, CAG repeat length, and clinical progression in Huntington's disease
Authors: Rosenblatt Adam , Kumar Brahma V. , Mo Alisa , Welsh Claire S. , Margolis Russell L. , Ross Christopher A. 
Published: December 2011

AbstractThe objective of this study was to further explore the effect of CAG repeat length on the rate of clinical progression in patients with Huntington's disease. The dataset included records for 569 subjects followed prospectively at the Baltimore Huntington's Disease Center. Participants were seen for a mean of 7.1 visits, with a mean follow‐up of 8.2 years. Subjects were evaluated using the Quantified Neurologic Examination and its Motor Impairment subscale, the Mini‐Mental State Examination, and the Huntington's disease Activities of Daily Living Scale. By itself, CAG repeat length showed a statistically significant but small effect on the progression of all clinical measures. Contrary to our previous expectations, controlling for age of onset increased the correlation between CAG repeat length and progression of all variables by 69% to 159%. Graphical models further supported the idea that individuals with smaller triplet expansions experience a more gradual decline. CAG repeat length becomes an important determinant of clinical prognosis when accounting for age of onset. This suggests that the aging process itself influences clinical outcomes in Huntington's disease. Inconsistent results in prior studies examining CAG repeat length and progression may indeed reflect a lack of age adjustment. © 2011 Movement Disorder Society
Ultrawideband quadrature power divider employing double wireless via
Authors: Ibrahim Siti Zuraidah , Bialkowski Marek E. , Abbosh Amin M. 
Published: December 2011

AbstractThe article reports the design of an ultrawideband quadrature power divider in uniplanar microstrip technology. The proposed device uses the conventional Wilkinson power divider with one of its output arms equipped with a double wireless via acting as a phase adjusting circuit. The device is manufactured showing a wide bandwidth in terms of return loss, isolation, power division, and a differential phase shift of 90° across the frequency band of 3–8 GHz. Its compact size and good performance makes it suitable for use in wideband‐balanced amplifiers. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:300–305 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26519
A miniaturized dual band bow‐tie microstrip antenna for implantable and wearable telemedicine applications
Authors: Rucker Daniel G. , Al‐Rizzo Hussain M. , Wolverton Michael J. , Khaleel Haider R. 
Published: December 2011

AbstractIn this article, a miniaturized dual band, multislotted bow‐tie microstrip antenna for wearable telemedicine applications involving a bidirectional wireless link between implantable and wearable systems is proposed. The number, size, and position of the slots, center width, as well as the size of the ground plane, were selected to control the TM30 mode such that the antenna resonates at the desired frequencies and provides the radiation patterns for the intended application. The antenna operates with a dipole‐like radiation pattern in the 915 MHz band and a broadside radiation pattern in the 2.45 GHz band. The reflection coefficient and far‐field radiation patterns were measured and compared against the simulated results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:365–369, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26523
A 60‐GHz three‐stage low noise amplifier using 0.15‐μm gallium‐arsenic pseudomorphic high‐electron mobility transistor technology
Authors: Hu Chih‐Min , Hung Chung‐Yu , Chu Chun‐Hsueh , Chang Da‐Chiang , Juang Ying‐Zong , Gong Jeng , Huang Chih‐Fang , Chin Chih‐Min 
Published: December 2011

AbstractA 60 GHz monolithic low‐noise amplifier (LNA) fabricated with 0.15‐μm gallium‐arsenic pseudomorphic high‐electron mobility transistors is presented.Using a three‐stage cascaded topology and in‐stage transmission lines, the LNA is designed using 5 V power supply voltage. Measured results of the LNA show the peak gain of 13.5 dB and the lowest noise figure of 5.15 dB around 61 GHz, and the 1 dB compression point (P1dB) of the LNA is −10 dBm. The LNA also demonstrates a complete design flow for millimeter‐wave applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:329–332, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26525
Envelope tracking power amplifier with saturated driver amplifier optimized for overall efficiency
Authors: Jeong Jinseong 
Published: December 2011

AbstractThis letter presents a new technique to enhance the overall efficiency of a two‐stage envelope tracking (ET) power amplifier (PA). Because of heavy gain compression, ET amplifiers can suffer from inefficient driver stages. By reducing the supply voltage of the driver amplifier, its efficiency can be improved without degrading the linearity performance of the overall PA system because the final‐stage ET PA allows the decrested RF signal as an input. This technique is demonstrated for a single carrier WCDMA signal using a RF PA based on a GaAs HVHBT with a dynamic supply modulator and a driver stage based on a GaN heterojunction field‐effect transistor (HFET). The measurement shows that the drain efficiency of the driver amplifier is improved from 25.6 to 41.5% and the overall efficiency of the ET PA system is improved from 46.2 to 48.3% while the efficiency of the final‐stage ET PA is maintained at higher than 55%. The average output power is greater than 44.6 dBm, the overall gain is greater than 20 dB, and the adjacent channel leakage ratio is less than −46 and −53 dBc at 5‐ and 10‐MHz frequency offsets, respectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:505–507, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26527
ANFIS models for synthesis of micro‐coplanar stripline and asymmetric coplanar stripline with an infinitely wide strip
Authors: Kaya S. , Guney K. , Yildiz C. , Turkmen M. 
Published: December 2011

AbstractIn this letter, computer‐aided design models based on adaptive‐network‐based fuzzy inference system (ANFIS) for the synthesis of two coplanar stripline structures are presented.These coplanar stripline structures are micro‐coplanar stripline and asymmetric coplanar stripline with an infinitely wide strip. Four optimization algorithms, hybrid learning (HL), simulated annealing, least‐squares, and genetic, are used to determine optimally the design parameters of the ANFIS models. The results of ANFIS models are compared with the results of quasi‐static analysis, synthesis formulas available in the literature, a full‐wave electromagnetic simulator IE3D, and experimental works realized in this study. The results of ANFIS models agree with the results of other methods and experimental works. When the performances of ANFIS models are compared with each other, the best results for training and test are obtained from the models trained with HL algorithm. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:460–467, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26530
Design of a K‐band reflectarray antenna using double square ring elements
Authors: Ma Bing , Xia Mingyao , Yan Lubin 
Published: December 2011

AbstractDesign of a K‐band reflectarray antenna using 15 × 15 double square ring elements printed on a single substrate and backed by a ground plane separated by an air layer is proposed. The double square ring element supplies a 530° dynamic range of the reflection phase variation, and the phasing curves are nearly linear. A prototype is manufactured and tested, and good agreements between simulation and measurement are demonstrated. The measured gain is about 23 dBi at the center frequency 24 GHz, and the 1‐dB gain bandwidth is about 20%. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:394–398, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26535
An ultrawideband bandpass filter with steeply sloped rejection using stub‐loaded resonator
Authors: Xu Jin , Hua Changzhou , Li Bo , Wang Hui , Miao Chen , Wu Wen 
Published: December 2011

AbstractAn ultrawideband (UWB) bandpass filter with steeply sloped rejection is proposed in this article. The proposed filter has five transmission poles inside the passband and four transmission zeros on both side of passband. Using the even‐ and odd‐mode analysis method, closed‐form formulas for the position of poles and zeros are given. Finally, a UWB bandpass filter is fabricated and measured. The simulation and measurement agree well with each other. Furthermore, due to the two tunable transmission zeros very close to the filter passband, the fabricated filter has 136‐ and 72‐dB/GHz slopes in the lower and upper transition band. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:326–329, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26538
Experiments on through‐wall imaging using ultra wideband radar
Authors: Dionisio Carlos R. P. , Tavares Sérgio , Perotoni Marcelo , Kofuji Sergio 
Published: December 2011

AbstractThrough‐wall imaging (TWI) may provide vital information on interior environment in cases when physically entering such environment would pose danger to the person involved.The concept of ultra wideband radar (UWB radar) is an emerging technology, which offers high spatial resolution, as opposed to narrow band radars. Thus, TWI applications using UWB radar have become a growing field of research with several applications in the civil and defense areas such as rescue and surveillance. For this study, a prototype system of UWB radar to TWI has been built. Analyses and result to several kinds of experiments have been presented, that is, detection and visualization of metallic targets behind wooden board wall and concrete blocks wall. The results are encouraging and show the advantages of using UWB radar for TWI. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:339–344, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26543
A planar monopole UWB antennas with rounded patch and ground plane possessing improved impedance matching
Authors: Melo D. R. , Kawakatsu M. N. , Nascimento D. C. , Dmitriev Victor 
Published: December 2011

AbstractA planar monopole UWB antenna with rounded patch and rounded truncated ground plane for ultra‐wideband applications is investigated. The geometry of the antenna is optimized to obtain a minimum return loss. The antenna provides the return loss better than −15 dB in almost the entire (3.1–10.6) GHz frequency band and good radiation characteristics. The simulated and experimental results are in a good agreement. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:335–338, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26544
Resonant filtering characteristic of symmetrical complementary metamaterial at terahertz frequencies
Authors: Zhang Bao‐Yue , Li Jiu‐Sheng 
Published: December 2011

AbstractAn equivalent circuit model was used to analyze a symmetrical complementary metamaterial for resonant filtering characteristic at terahertz frequencies. Using terahertz time‐domain spectroscopy system, we examined the transmittance spectra for the metamaterial structure. The experimental results validate those of the theoretical predictions. The structure could lead to be a terahertz wave bandpass filter with a narrow transmission bandwidth centered at 2.01 THz and very sharp edges. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:351–354, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26548
A new approach to the design of a dual‐band IFA with a metamaterial unit cell
Authors: Kim Sangwon , Choi Hak Keun , Choi Jae Ick , Park Jae Hyun 
Published: December 2011

AbstractThis article proposes a new approach to obtaining a dual‐band inverted‐F antenna (IFA) with a novel metamaterial unit cell providing a negative index of refraction. The dual‐resonance characteristic of the proposed IFA can be achieved because of the stop‐band property of the metamaterial unit cell. The novel metamaterial unit cell of the proposed antenna has a positive refractive index (PRI), a negative refractive index (NRI), and the stop‐band property between PRI and NRI. In addition, to control the resonant frequency of the proposed antenna, a capacitor is loaded in the metamaterial unit cell. To prove the validity of the proposed antenna, the properties of a homogeneous frequency‐dependent (HFD) material, which can be represented in the HFSS software, are used. The metamaterial is replaced by the HFD material to confirm the effective constitutive parameters of the metamaterial unit cell. It is confirmed that the results using the metamaterial and the HFD material are similar. To prove the validity of the proposed design approach, a good agreement between experimental results and theoretical predictions is demonstrated, meaning that the approach is usable for practical applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:545–549, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26554
Photonic generation and radio transmission of ECMA 387 signal at 60 GHz using WDM demultiplexer
Authors: Shao Tong , Paresys Flora , Guennec Yannis Le , Maury Ghislaine , Corrao Nicolas , Cabon Beatrice 
Published: December 2011

AbstractWe propose to realize an experimental setup for millimeter wave (mmW) band Radio over Fiber system using wavelength division multiplexing technique.In this article, broadband mmW at 60‐GHz band, which is compliant with the ECMA 387 standard, is generated by photodetection and transmitted with horn antennas. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:275–277, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26556
Experimental and numerical study of highly sensitive displacement sensors based on photonic crystals at microwave band
Authors: Sha Shaoshu , Zhai Huiqing , Rowda Vinay R. , Chen Nan‐Wei , Zhou Weidong , Lu Mingyu 
Published: December 2011

AbstractStructures composed of two photonic crystal slabs are fabricated, measured, and simulated around 13.5 GHz.Experimental and simulated results are in good agreement. The transmission spectrum is highly sensitive to the distance between the two slabs, which demonstrates that the structures under investigation can be used to achieve displacement sensors. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:432–434, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26558
Planar microstrip monopole antenna for UPCS and UWB applications
Authors: Morsy Mohamed M. , Khan Muhammad R. , Harackiewicz Frances J. 
Published: December 2011

AbstractThis letter presents a microstrip‐fed antenna that is compact, low profile, and planar.The antenna is suitable for UPCS (1.85–1.99 GHz) and UWB applications. The antenna occupies an area of 20 × 40 mm2. The antenna exhibits dual frequency bands at 1.8–2 GHz and 3.825–8.177 GHz with good radiation pattern characteristics. The antenna radiation pattern is almost as the radiation pattern of a monopole antenna, and the gain remains nearly constant within UPCS and UWB bands. The antenna is suitable for application to wireless communication systems. Finally, there is good agreement between the measured and the simulated results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:496–500, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26564
Multiresonance printed monopole antenna for DCS/WLAN/WIMAX applications
Authors: Lavakhamseh H. , Ghobadi Ch. , Nourinia J. , Ojaroudi M. 
Published: December 2011

AbstractIn this article, a novel printed monopole antenna is presented for simultaneously satisfying DCS, wireless local area network (WLAN), and worldwide interoperability for microwave access (WiMAX) applications.The operating frequencies of the proposed antenna are 1.8 GHz, which covers DCS operations, 2.4/5.2/5.8 GHz for WLAN system and 2.5/3.5/5.5 GHz for WiMAX system. The desired resonant frequencies are obtained by adjusting the length of folded Γ‐shaped arms. Also by cutting an H‐shaped slot in the bottom of microstrip feedline on the ground plane, much wider impedance bandwidth can be produced. Prototypes of the proposed antenna have been constructed and studied experimentally. The measured results show good agreement with the numerical prediction and good multiband operation. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:297–300, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26572
Investigation of internal nonhomogenous volumes of perturbation as tuning and miniaturization elements for cavity resonators
Authors: Dancila D. , Rottenberg X. , Tilmans H. A. C. , De Raedt W. , Huynen I. 
Published: December 2011

AbstractIn this article, we investigate the tuning and miniaturization performance induced by a volume perturbation inserted in a cavity resonator. The volume perturbation is either a rectangular perturbation centrally located, called central postperturbation (CPP) or dually, a hole shaped in an annular extruded volume, called side annular perturbation (SAP). The tuning and miniaturization mechanism is fully described using the small perturbation theory. This serves the analytical evaluation of the frequency shift resulting from the insertion of the perturbation volume in the cavity resonator. The impact of these perturbations is assessed also by HFSS simulations and measurements of 72 different cavity resonators. An idle cavity resonator characterized by a resonance frequency of 4 GHz is tuned from 1 to 6 GHz. A maximal frequency shift of 3 GHz and 2 GHz is measured for respectively the resonator with CPP and SAP, resulting in a total tuning range of 125%. Additionally, the CPP serves miniaturization purposes, as cavity resonators with a resonance frequency as low as 1 GHz were measured, derived from an idle cavity resonator at 4 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:491–496, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26578
A triple band‐notched planar monopole antenna for ultrawide band applications
Authors: Natarajamani S. , Behera Santanu Kumar , Patra Sarat Kumar 
Published: December 2011

AbstractThis article presents the compact planar antenna with 3.5/5.5/8.2 GHz triple band‐notched characteristics. The antenna consists of an octagon shape patch with 50 Ω transmission line. By etching two C‐shaped slots in the patch and adding pair of L‐shaped resonator coupled to the radiating patch, band‐rejected filtering properties in the WiMAX/WLAN/ITU bands are achieved. The proposed ultrawide band (UWB) antenna is optimized to operate in the frequency band from 3 to 11 GHz for VSWR < 2. Measured results confirm that the antenna is suitable for UWB applications because of its compact size and high performance. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:539–543, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26581
Transmissive fiber optical displacement sensor using cutting plate
Authors: Hu Xiaogen , Li Yuhe , Chen Yanxiang 
Published: December 2011

AbstractIntensity modulated transmissive fiber optical displacement sensor is introduced and its performance is investigated.In the experiments, the relative error is 4% and the linearity is higher than 99.2% with source light intensity stable. The relative error is 0.2% with the source light intensity changed at a certainly frequency. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:446–448, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26586
37–38 GHz substrate integrated filtenna for wireless communication application
Authors: Yu Chen , Hong Wei 
Published: December 2011

AbstractThe seamless or incorporate design of RF filter and antenna is very important for size and loss reduction in the design of millimeter wave wireless communication systems.Such antenna is then called as filtenna. In this article, an integrated design of the filter and antenna or filtenna at 37–38 GHz for local‐multipoint‐distribution‐system (LMDS) based on substrate integrated waveguide (SIW) technology is presented. One slot and two‐slot SIW antennas and corresponding filtennas are simulated, fabricated and measured. By comparing the measured return loss and radiation patterns between the filtenna and the original antenna, it is concluded that the performance of the filtenna is kept nearly no change within the working frequency band while the out of band signal is effectively filtered. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:346–351, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26589
Single‐/multiband CMOS low‐noise amplifier using concentric switching inductors
Authors: Wang Ruey‐Lue , Chen Shih‐Chih , Huang Cheng‐Lin 
Published: December 2011

AbstractIn this article, a low‐noise amplifier (LNA) using concentric switching inductors were designed and measured. A voltage supply is fed through the switching inductors. The presented circuit is a modified cascoded amplifier configuration which input stage is a common‐gate structure. The switching inductors are implemented by three series‐wound concentric planar spiral inductors associated with two PMOSFET switches. According to on or off state of two PMOSFET switches, the circuit has theoretically four transfer characteristics, including one single‐band, two dual‐band, and one triple‐band frequency responses. For the LNA, using the concentric‐type switching inductors, the simulated and measured gains are nearly more than 12 and 10 dB at all operation frequency bands, respectively. The measured reflection coefficients are almost less than −10 dB at all operation frequency bands. The measured minimum noise figures are almost less than 4.5 dB at all operation frequency bands. The power consumption is 9 mW. The chip size is 1.03 × 1.04 mm2. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:309–315, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26591