bluuebunny/crossref_metadata_2025_split huggingface dataset:
Widely tunable double‐ring resonator add/drop reflection filter based on polymer PLC
Authors: Lee Ho , Lee Youngsik , Kim Gunwoo , Kim Suhyun , Chung Youngchul 
Published: February 2010

AbstractWe demonstrate a widely tunable polymer add/drop reflection filter using double‐ring resonators with slightly different radii. The reflector proposed as an alternative to grating‐based wavelength‐selective reflectors shows a wide tuning range of 42.3 nm using a small amount of current as small as 30 mA. If the proposed reflection filter is hybrid‐integrated with a reflective semiconductor optical amplifier or a superluminescent laser diode, a low‐cost widely tunable laser could be realized. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:852–855, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25048
Low‐voltage/low‐power 7‐GHZtransformer‐coupled current‐reused CMOS QVCO with wide tuning range
Authors: Tseng Yan‐Ru , Huang Tzuen‐Hsi , Wu Shang‐Hsun 
Published: February 2010

AbstractIn this article, we report the design of a transformer‐coupled current‐reused quadrature voltage‐controlled oscillator (QVCO) having low‐voltage operation, low‐power consumption, and a wide tuning range.An improved trifilar transformer that is fabricated by symmetrically interlacing two half circle secondary coils between the turns of the primary coil is proposed to provide a higher magnetic coupling factor. A QVCO integrated with such a trifilar transformer is implemented using 0.18‐μm RF CMOS technology. When the QVCO is operated at a supply voltage of 1V at 7.263 GHz, the measured phase noise is −111.4 dBc/Hz at a 1‐MHz offset. Further, the QVCO core draws only 1.58 mW. The total tuning range is ∼510 MHz over the whole tuning range (from 0 to 1.8 V). The calculated figure of merit is 186.6 dB and the power‐frequency‐tuning‐normalized factor is −9.4 dB. As compared to the reported data in a previous study, a 28.2% reduction in power consumption and a 54.5% increase in tuning range can be achieved. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:797–801, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25058
Complementary predistorter in CMOS differential power amplifier
Authors: Oh Inn‐Yeah , Ra Keuk‐Hwan , Park Chul‐Soon 
Published: February 2010

AbstractFor adaptive improvement of linearity above a 12 dB PAPR for 64QAM WiMAX, a complementary feedback loop in a differential amplifier is adopted as a pre‐distorter that is realized using an NMOS cell operating in the triode region in order to compensate the gm3, the third order transconductance, of the differential amplifier. The power amplifier has been implemented in 0.18 μm CMOS technology, and the chip size is 870 μm × 1050 μm. The proposed PA obtains the 42% efficiency at P1dB while improving the IMD by more than 10 dB above 15 dBm output power levels. It shows a gain of as much as 14.5 dB, and a return loss below −12 dB for 2.3–2.4 GHz operation. Finally, the fabricated PA complies with the spurious emission of WiMAX standards up to 22 dBm. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:833–836, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25062
Design of tri‐band microstrip bandpass filter using folded tri‐section stepped‐impedance resonator
Authors: Liu Haiwen 
Published: February 2010

AbstractA tri‐band microstrip bandpass filter using folded tri‐section stepped‐impedance resonators is designed, analyzed, and fabricated in this article.Furthermore, the filter's coupling structure analysis and equivalent circuit model are discussed theoretically, and the design methodology of tri‐band filter is explained. Simulated and measured results verify that the central frequencies of the three passbands are located at about 1.6, 2.3, and 4.3 GHz, respectively. Besides, the circuit size of the proposed filter occupies only 26 × 26 mm2 (≈ 0.22λg × 0.22λg). © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:895–898, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25063
CPW‐fed trapezoidal antenna with dual band‐notched characteristic for UWB application
Authors: Xi Juan‐Mei , Liang Chang‐Hong 
Published: February 2010

AbstractA novel ultra‐wideband (UWB) design of a single‐layer coplanar waveguide‐fed planar monopole antenna with dual band‐notched characteristic is presented. By inserting two opened rectangular loop slots to the ground‐notched trapezoidal patch and adjusting the dimensions of the slots, the proposed antenna, which includes two notched ground planes only 24 mm in width and 31 mm in height, can reach a frequency band‐width, defined by voltage standing wave ratio <2, of 9.4 GHz (from 3 to 12.4 GHz), covering the entire UWB band (3.1–10.6 GHz), and have two frequency notch from 3.55–4.57 GHz and 5.55–6.87 GHz. Good monopole‐like radiation patterns except in the notched frequency band have also been obtained. Details of the proposed antenna design and the simulation results are presented and discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:898–900, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25064
Diffractive optical elements with square concentric rings of equal width
Authors: Alda Javier , Sanchez‐Brea Luis Miguel , Salgado‐Remacha Francisco Javier , Rico‐García José María 
Published: February 2010

AbstractA diffractive optical element having equal‐width concentric square rings is analyzed in this article. This constant width makes possible its realization using spatial light modulators or square pixels phase screens. It allows a simple analytical treatment, and the element is also simulated using the Rayleigh‐Sommerfeld approach. An experimental verification of its performance has been compared with the simulated results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:930–934, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25065
Effect of the substrate permittivity on the features of a UWB planar slot antenna
Authors: Barbarino Sebastiano , Consoli Fabrizio 
Published: February 2010

AbstractThe effect of the substrate permittivity on the features of a planar slot antenna for Ultrawideband communications has been investigated here. On this purpose, the same antenna structure has been studied and realized on different substrates. The study involves both simulations and measurements on different realized prototypes. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:935–940, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25066
Dual‐band 3D magnetic EZ antenna
Authors: Lin Chia‐Ching , Ziolkowski Richard W. 
Published: February 2010

AbstractSeveral dual‐band three‐dimensional magnetic EZ antenna designs and their simulated performance characteristics are presented. The proposed antennas are formed by integrating multiple capacitively loaded loop elements with a coaxially fed electrically small semicircular loop antenna. They can be designed for a broad range of frequencies by tuning the near field resonant parasitic elements separately. The design details, radiation efficiencies, and fractional bandwidths of these antenna systems for their different dual‐band frequency ranges are reported. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:971–975, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25067
Retracted: Design, simulation, and measurement of metamaterial absorber
Authors: Cheng Yongzhi , Yang Helin 
Published: February 2010

AbstractThe following article from Microwave and Optical Technology Letters, Volume 52, Issue 4, "Design, simulation, and measurement of metamaterial absorber" by Yongzhi Cheng and Helin Yang, published online on February 11, 2010 in Wiley InterScience (www.interscience.wiley.com), has been retracted by the journal Editor‐in‐Chief, Kai Chang, and Wiley Periodicals, Inc. as the Publisher did not have permission from the authors to publish it. The Publisher apologizes for this error.
Broadband low‐profile microstrip antenna design using GPSO based on MOM
Authors: Lin Chen , Zhang Fu‐Sun , Zhao Gang , Zhang Fan , Jiao Yong‐Chang 
Published: February 2010

AbstractA new evolutionary approach for broadband low‐profile microstrip antenna design is presented. The modified particle swarm optimization algorithm inspired by the wild geese group (Geese‐PSO) and the method of moments (MOM) are combined to optimize the antenna satisfying a certain design criterion. The antenna geometric parameters are extracted to be optimized by Geese‐PSO, and a fitness value is evaluated by MOM simulator to represent the performance of each candidate design. The optimized microstrip antenna with a U‐shaped parasitic element, printed on a thin substrate (thickness of 0.008 λ0), achieves the measured bandwidth of 63 MHz (2.56%), corresponding to the simulated bandwidth of 65 MHz. The agreement between the simulated and measured bandwidths testifies the validity of the GPSO/MOM method. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:975–979, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25069
Small‐size quasi‐fractal patch antenna using the Minkowski curve
Authors: Oliveira E. E. C. , Silva P. H. da F. , Campos A. L. P. S. , d'Assunção A.G. 
Published: February 2010

AbstractThis article shows a new quasi‐fractal microstrip patch antenna using the Minkowski curve at the radiant and nonradiant margin of this device. The structures analyzed were initially designed using the Ansoft Designer™ software that implements the method of moments. Some antenna prototypes were built and measured. The use of the inset‐fed technique enables a good impedance matching, as can be confirmed by the low return loss obtained (<−25 dB) at the resonance frequencies. Antennas designed using the Minkowski curve presented a reduction of up to 42% when compared with a conventional inset‐fed rectangular patch. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:805–809, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25071
Dual‐band and enhanced band FSS characterization using WCIP method
Authors: Titaouine M. , Raveu N. , Gomes Neto A. , Baudrand H. 
Published: February 2010

AbstractWave concept iterative procedure (WCIP) is used to analyze dual‐band and enhanced band frequency selective surfaces (FSS). In the metallic U‐shaped simple FSS, a fine‐tune of the two rejected bands is insured by varying independently the length of the two parallel U‐shaped FSS strips. The dual band response can also be obtained from the two‐level rectangular conducting patches FSS. An enhanced rejecting bandwidth is observed for FSS with two square ring printed on each substrate side. The WCIP results are successfully compared with measurements and HFSS results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:836–839, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25073
Dual‐mode trapezium‐loop microstrip bandpass filter
Authors: Zhang You‐Jun 
Published: February 2010

AbstractA novel compact and simple microstrip trapezium loop bandpass filter structure using only one resonator is developed in this letter, the inequilaterally structure perturbs the fields of the resonator and excite degenerate modes.Without coupling gaps, the new filter can reduce uncertainty in fabrication. Simulated results agree well with measured results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:840–841, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25074
Composite right/left‐handed metamaterial transmission lines with unconventional dispersion and applications
Authors: Sisó Gerard , Bonache Jordi , Martín Ferran 
Published: February 2010

AbstractIn this article, novel metamaterial transmission lines exhibiting right‐handed wave propagation at low frequencies and left‐handed wave transmission at high frequencies are presented. The unconventional dispersion characteristics of these composite right/left‐handed transmission lines is obtained by parallel connecting left‐handed and right‐handed unit cells, both implemented by using complementary split‐ring resonators. Thanks to the diplexer action of the structure, either the right‐handed (tuned at the lower frequency band) or the left‐handed (tuned at the upper frequency band) unit cell transmits the injected power, thus achieving the unconventional dispersion of the structure. It is also shown in this article that these artificial lines are of interest for the design of certain microwave components exhibiting dual‐band characteristics. Examples are provided including design and characterization. The measurements are indicative of good device performance at the two operating bands and wide bandwidths. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:904–909, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25077
Tunable terahertz plasmonic lenses based on semiconductor microslits
Authors: Chen Meng‐Ku , Chang Yun‐Ching , Yang Chia‐En , Guo Yaohui , Mazurowski John , Yin Stuart , Ruffin Paul , Brantley Christina , Edwards Eugene , Luo Claire 
Published: February 2010

AbstractA theoretical investigation of tunable terahertz (THz) plasmonic lenses on the basis of InSb microslits is presented.First, it is demonstrated that the surface plasmon polaritons propagating in an InSb microslit array with variant slit widths would face different phase retardations, which, by design, can produce a focusing wavefront. The extraordinary transmission of THz radiation through the InSb subwavelength slit array is also observed. Second, a method for tuning the focal lengths of InSb plasmonic lenses is proposed. The results in this article provide a potential way to realize a tunable terahertz plasmonic lens with high transmission, which can be applied to the application of rapid 3D z‐scanning based THz imaging and sensing. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:979–981, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25079
Analyzing impedance characteristics of monopole antennas with different chassis widths for dual resonance‐based broadband operation
Authors: Jung Jinwoo , Lee Hyeonjin , Lim Yeongseog 
Published: February 2010

AbstractVariation of the impedance characteristics between two monopole antennas, according to the width of chassis is analyzed. Dual resonance‐based broadband antennas are proposed on the basis of the analyzed results. The experimental antennas are an inverted L‐shaped monopole antenna and a printed meander line monopole antenna. The dimensions of the derived antennas with a chassis are appropriate for a USB dongle application. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:981–984, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25082
Suspended stripline coupled lines with grounded strips for equalization of inductive and capacitive coupling coefficients
Authors: Gruszczynski Slawomir 
Published: February 2010

AbstractA suspended stripline coupled‐line structure has been proposed, which allows for achieving equalization of inductive and capacitive coupling coefficients in a wide range of directional couplers' coupling C. Three different variants of the proposed structure have been considered, and the results of numerical calculations using FD technique have been presented, which show the possibility of equalization of inductive and capacitive coupling coefficients. Moreover, graphs showing structural parameters are presented in a wide range of coupling coefficient k. The results of investigations have been confirmed by the measurements of the designed 15‐dB directional coupler. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:874–877, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25085
A rectangular ring backed CPW UWB filter with notched band
Authors: Goyal Shally , Abegaonkar Mahesh P. , Basu Ananjan , Koul Shiban K. 
Published: February 2010

AbstractA band notched CPW UWB filter backed by rectangular rings is proposed.Initially, cascading of aperture‐backed second‐order microstrip filters is done to achieve the UWB passband. Later, to take advantage of the CPW geometry, the filter is converted to CPW configuration with rings at the back to achieve sharp cutoff characteristics and a notch at 5.1 GHz. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:950–954, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25088
Design of dual‐band quadrifilar spiral antennas for satellite‐mobile handsets
Authors: Abd‐Alhameed R. A. , Zhou D. , See C. H. , Excell P. S. , Abusitta M. M. , Alkhambashi M. S. , McEwan N. J. 
Published: February 2010

AbstractA novel quadrifilar spiral antenna is proposed for use in personal communications mobile terminals exploiting the “big low earth orbit” (big‐LEO) satellite system (uplink 1.61–1.63 GHz; downlink 2.48–2.5 GHz). Feeding of the antenna from the outer periphery is proposed, to avoid the complexity and space requirements of a centre feed; an externally fed antenna can also be fed either by coaxial cables or stripline. Moreover, the hybrid phasing network and the matching network (if required) can be located outside and possibly printed in the same plane as the antenna structure. Versions of the design were investigated using the method of moments and in hardware realizations. These had a finite ground plane with air dielectric between the spirals and the ground plane. Performance suitable for satellite mobile system applications was demonstrated, including dual‐band matching. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:987–990, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25090
The inhibitory effect of a chewing task on a human jaw reflex
Authors: Maillou Pauline , Cadden Samuel W. , Lobbezoo Frank 
Published: February 2010

AbstractThis study was undertaken to investigate whether an inhibitory jaw reflex could be modulated by experimentally controlled conditions that mimicked symptoms of temporomandibular disorders. Reflecting on previous work, we anticipated that these conditions might suppress the reflex. Electromyographic recordings were made from a masseter muscle in 18 subjects, while electrical stimuli were applied to the upper lip. An inhibitory reflex wave (mean latency 47 ms) was identified and quantified. Immediately following an accelerated chewing task, which in most cases produced muscle fatigue and/or pain, the size of the reflex wave decreased significantly by about 30%. The suppression of inhibitory jaw reflexes by fatigue and pain may result in positive feedback, which may contribute to the symptoms of temporomandibular disorders. Future studies of temporomandibular disorder sufferers will help to determine whether such reflex changes reflect the underlying etiology and/or are a result of the temporomandibular disorder itself. Muscle Nerve, 2010
The β3‐adrenoceptor mediates the inhibitory effects of β‐adrenoceptor agonists via the urothelium in pig bladder dome
Authors: Masunaga Koichi , Chapple Christopher R. , McKay Neil G. , Yoshida Masaki , Sellers Donna J. 
Published: February 2010

AbstractAimsRelaxation of detrusor muscle via β‐adrenoceptors may contribute to urine storage during bladder filling. Thus there is increasing interest in β‐adrenoceptor agonists as a potential treatment for detrusor overactivity. The role of the urothelium in bladder responses to β‐adrenoceptor agonists is not yet clear, although we have shown that these agonists have a greater inhibitory effect on detrusor contraction when the urothelium is intact. The aim was to determine which β‐adrenoceptor subtype is involved in this effect.MethodsPaired strips of pig bladder dome mucosa‐intact and mucosa‐denuded, were mounted in tissue baths. Relaxation responses were obtained to β‐adrenoceptor agonists (isoprenaline, dobutamine, salbutamol or BRL37344) in carbachol pre‐contracted tissues. Inhibitory effects were studied by obtaining concentration‐response curves (CRCs) to carbachol in the presence and absence of β‐adrenoceptor agonists. The inhibitory effects of isoprenaline were also studied following incubation with β‐adrenoceptor antagonists (propranolol, CGP20712, ICI‐118, 551 or SR 59230A; non selected, β1, β2 and β3 selective respectively).Resultsisoprenaline, dobutamine, salbutamol and BRL37344 all relaxed carbachol pre‐contracted tissues and responses were similar in intact and denuded strips. In inhibition experiments, β‐adrenoceptor agonists caused rightward shifts of carbachol CRCs. In intact strips the shift was greater with isoprenaline and BRL37344, but not with dobutamine or salbutamol. This increased shift was still observed in tissues pre‐incubated with propranolo, CGP20712 and ICI‐118, 551, but not with SR 59230A.Conclusionsβ3‐adrenoceptors are involved in mediating inhibitory effects of β‐adrenoceptor agonists on detrusor contractions via the urothelium in pig bladder dome. Neurourol. Urodynam. 29:1320–1325, 2010. © 2010 Wiley‐Liss, Inc.
Synthesis of waterborne nanopolyanilne latexes and application of nanopolyaniline particles in epoxy paint formulation for smart corrosion resistivity of carbon steel
Authors: Jadhav Rajendra S. , Patil Kesharsing J. , Hundiwale Dilip G. , Mahulikar Pramod P. 
Published: February 2010

AbstractPolyaniline (PANI) latexes were synthesized by emulsion polymerization using dodecyl benzene sulfonic acid (DBSA) and sodium dodecyl sulfate (SDS) as a surfactant. Synthesized PANI–DBSA and PANI–SDS latexes were characterized by IR and UV‐visible spectroscopies, and surface morphology was analyzed by transmission electron microscopy. The PANI–DBSA were found to be nanograin shaped whereas PANI–SDS were as nanofibers. In the second stage rheological properties of waterborne PANI latexes were characterized by viscosity measurement and their dispersion stability in water. The surface morphology of the coating was examined by scanning electron microscope (SEM). The anti‐corrosion performance of uncoated carbon steel, PANI–DBSA and PANI–SDS coated carbon steel was evaluated by tafel slope analysis and immersion test studies of 0.5, 1, and 1.5% PANI/Epoxy coatings were done in 5% NaCl aqueous solution. The results indicated that the nanoPANI in epoxy coating might work as an adhesion promoter and corrosion inhibitor. The waterborne latexes, thus, were found to be highly suitable and avoid the use of organic solvents or strong acids under environmentally benign conditions. Copyright © 2010 John Wiley & Sons, Ltd.