bluuebunny/crossref_metadata_2025_split huggingface dataset:
A multidimensional framework for financial–economic decisions
Authors: Hallerbach Winfried , Spronk Jaap 
Published: July 2003

AbstractMost financial–economic decisions are made consciously, with a clear and constant drive to ‘good’, ‘better’ or even ‘optimal’ decisions. Nevertheless, many decisions in practice do not earn these qualifications, despite the availability of financial economic theory, decision sciences and ample resources. We plea for the development of a multidimensional framework to support financial economic decision processes. Our aim is to achieve a better integration of available theory and decision technologies. We sketch (a) what the framework should look like, (b) what elements of the framework already exist and which not, and (c) how the MCDA community can co‐operate in its development. Copyright © 2003 John Wiley & Sons, Ltd.
The effect of offset patch on the broadband characteristics of an electromagnetically coupled patch antenna
Authors: Chung Kwok L. , Mohan Ananda S. 
Published: July 2003

AbstractIn this paper, we investigate the effect of the offset patch and layer misalignments on the broadband characteristics of a two‐layer, electromagnetically coupled, stacked patch antenna with airgap at the X‐band. Linear and angular displacements of the parasitic patch on the dielectric layer are considered for the experimental study. The measured results show very robust impedance characteristics of the proposed antenna element against layer misalignment. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 345–348, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11056
An improved analysis of one‐dimensional PBG structure using the ADI‐FDTD method
Authors: Tang Wei , Jiao Pei‐Nan , Li Le‐Wei , Li Qing‐Liang , Wu Zhen‐Sen 
Published: July 2003

AbstractIn this paper, an improved finite‐difference time‐domain (FDTD) algorithm is proposed in order to eliminate the restraint by the Courant–Friedrich–Levy condition. The new algorithm is developed based on an alternating‐direction implicit (ADI) approach. In this method, the conventional time step is divided into two time sub‐steps and each of their difference errors can be remedied. It thus has a high efficiency in the case when a long time is spent to reach a stable status, and this situation usually appears in periodical structures such as PBG structures. A numerical example of one‐dimensional (1D) PBG materials is considered to demonstrate the availability and efficiency of this scheme. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 348–352, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11057
Genetic algorithm optimization of a multisectional corrugated conical horn antenna
Authors: Yang Dooyeong , Chung You Chung , Haupt Randy 
Published: July 2003

AbstractThis paper presents the design of a wideband corrugated multisectional conical horn using a genetic algorithm (GA). The GA optimizes the length, flare angle, and first slot depth of each section of the horn in order to match the admittance, reduce the voltage standing wave ratio (VSWR) of the horn, and generate the desired pattern. A VSWR of less than 1.6 is obtained over the frequency range 11–18 GHz. The optimized multisectional conical horn antenna has four sections, is less than 7λ long, and has very low sidelobe levels. The ratio between ratio between the co‐polarization and the cross‐polarization patterns is greater than 60 dB. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 352–356, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11058
Novel phase shift line in feedforward circuit using photonic bandgap
Authors: Seo Chulhun 
Published: July 2003

AbstractIn this paper, a phase shifter with a shifting photonic bandgap (PBG) cell is designed and fabricated in the main loop of a linear feedforward circuit. A portion of the PBG cell is designed for phase shift in the tuning phase. The shifting PBG cell has been applied in the feedforward main loop in order to cancel the main two‐tone signals. The complete cancellation of the main signal is obtained in the main signal loop of a linear power amplifier. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 357–359, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11059
Transmitting and receiving wide‐band signals using reciprocity
Authors: Ji Zhong , Sarkar Tapan K. , Jung Baek Ho 
Published: July 2003

AbstractIn this paper, we present a method based on reciprocity which can transmit and receive a baseband wide‐bandwidth signal without distortion. The time‐domain combined field integral equation (TD‐CFIE) is used to get the simulation results. Numerical results are presented, which show the validity of the presented methodology. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 359–362, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11060
Cost‐effective fabrication of a phase mask by direct etching of the laser‐interference grating on fused silica substrate
Authors: Lu Ying‐Tsung , Chen Yung‐Hsin , Chi Sien 
Published: July 2003

AbstractA simple and cost‐effective method to manufacture a phase mask with high diffraction efficiency for deep UV application is proposed. The deep rectangular grating fabricated by using laser interference is etched directly into a fused silica substrate, instead of the dielectric coating on a substrate (done in a previous method). Using the metal layer on a dielectric layer for masking in the deep, dry etching process is also unnecessary in our technique. A fabricated rectangular grating with high diffraction efficiency is presented in this paper. We also demonstrate the fabrication processes and show the optimum parameters for our proposed technology. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 362–365, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11061
Non‐reciprocal couplers using distributed amplifier topology
Authors: Parkinson Graham , Paul Dipak K. 
Published: July 2003

AbstractA distributed amplifier circuit can be adapted to form a non‐reciprocal four‐port coupler, which can be integrated in an MMIC such as an MMIC feedforward linearizer. This paper illustrates, by simulation, the potential for these couplers. Control of the coupling factor is discussed and the boundary of realisable circuit components is studied. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 366–368, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11062
Advanced modeling of semiconductor lasers based on quantum Boltzmann equations
Authors: Wartak M. S. , Weetman P. 
Published: July 2003

AbstractIn this paper, we briefly describe the development of an advanced model of semiconductor lasers. Wigner functions and quantum Boltzmann equations were used to formulate the model. Our aim is to improve upon the presently used drift‐diffusion‐based models. Basic laser characteristics, such as power spectrum and current across the structure of a single quantum well, have been determined. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 369–371, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11063
Parasitic resistance and polarization‐dependent polynomial‐based non‐linear analytical charge‐control model for AlGaN/GaN MODFET for microwave frequency applications
Authors: Korwal Manju , Haldar S. , Gupta Mridula , Gupta R. S. 
Published: July 2003

AbstractA simple and compact non‐linear analytical charge control model for the AlmGa1−mN/GaN MODFET is developed. This model incorporates the effect of parasitic resistances Rs and Rd, fermi potential (EF)‐variation with sheet‐carrier concentration ns, and the charge induced in 2D electron gases (2‐DEG) due to the highly dominant effects of spontaneous and piezoelectric polarization at the heterojunction of the MODFET. Extrinsic current‐voltage characteristics show good agreement with experimental data and closed‐form expressions for transconductance, drain conductance, and unit current‐gain cutoff frequency are obtained. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 371–378, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11064
A C‐band injection‐locked balanced oscillator for direct‐conversion QPSK modulation applications
Authors: Wen Guangjun , Xie Fuzhen , Shen Zhongxiang , Law Choilook , Li Jiayin , Ge Peng 
Published: July 2003

AbstractA novel quadrature phase shift keying (QPSK) modulation method for RF signal is proposed in this paper. An injection‐locked balanced oscillator (ILBO) operating in the 5.8‐GHz ISM band is developed to demonstrate the approach using a hybrid integrated microwave‐circuit technique. The developed ILBO shows a free‐running performance with anti‐phase outputs of −0.33 dBm at 5.8 GHz under dc bias of 1.183 V and 7.2 mA, total DC‐to‐RF efficiency of 21.8%, and phase noise of −114.85 dBc/Hz at 100‐kHz offset. In the locked state by a 5.8‐GHz injection signal of −23.0 dBm, the device achieved a locking bandwidth of 39 MHz from 5.7806–5.8196 GHz with a 22.5‐dB locking gain, and acquired an output signal phase variation of up to 178° by altering the bias. Four different phase‐state RF signals were obtained from the ILBO by combining the injection‐locking phase‐modulation scheme with a balanced oscillator topology of anti‐phase outputs. As a consequence, the ILBO with a single‐polar double‐throw switch can function as a direct‐conversion QPSK modulator by modulating both the oscillator and switch bias. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 378–381, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11065
Performance of planar four‐element array of single‐fed circularly polarized dielectric resonator antenna
Authors: Kishk Ahmed A. 
Published: July 2003

AbstractA single‐fed circularly polarized dielectric resonator antenna is analyzed numerically. The element is a perturbed rectangular dielectric resonator excited by a coaxial probe and is used in a four‐element planar array. Different arrangements and excitations for the elements are used to study their effect on the circular polarization bandwidth. The circular polarization (cp) bandwidth for the sequential rotation feeding is found to be the best method and the broadside radiation cp is frequency independent. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 381–384, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11066
Parameter extraction of a base‐collector equivalent circuit model for SiGe heterojunction bipolar transistors
Authors: Lee Seonghearn 
Published: July 2003

AbstractBy deriving new Z‐parameter equations, accurate extraction is performed to determine all base‐collector model parameters in a SiGe heterojunction bipolar transistor (HBT) equivalent circuit directly from measured S parameters, without any test structure and geometric calculation. The calculated power and current gains are in good agreement with the measured gains, thus verifying the accuracy of the extraction. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 384–387, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11067
A novel ion concentration measurement method using a PBG cell
Authors: Lin Huang‐Cuang , Liu Chin‐Hsiang , Tsao Shyh‐Lin 
Published: July 2003

AbstractA novel ion concentration in liquid detection measurement method is proposed. This new technique uses an improved low pass filter (LPF) photonic band gap (PBG) cell structure, which is laid out on board a printed circuit (PCB). This paper demonstrates how the method can be applied to measure the concentration of CuSO4with the advantage of low cost. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 387–389, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11068
PAE improvement and compensation of small‐signal gain drift due to temperature on power amplifiers through active biasing
Authors: Torregrosa‐Penalva Germán , Asensio‐López Alberto , Ortega‐González F. Javier , Blanco‐del‐Campo Álvaro 
Published: July 2003

AbstractPower millimetre‐wave band transmitters are commonly formed by a chain of MESFET or HEMT GaAs MMIC power amplifiers. Under large‐signal conditions the reverse gate output current, which appears at the gate port of those devices due to drain‐gate breakdown mechanisms, causes a drop in the power amplifier's power added efficiency (PAE) figure, thus affecting the entire transmitter reliability. Additionally, it is desirable to obtain a stable performance from the transmitters for different ambient temperatures. In particular, millimetre‐wave wireless systems, such as the local multipoint distribution system (LMDS), require constant small signal gain for a wide range of temperatures. In this paper, an active bias network is used to compensate for both effects. The performance of the active bias network is shown to be superior, in terms of the power amplifier's PAE and the compensation of the power amplifier's small signal gain drifts due to temperature, to a conventional resistive divider when used for biasing the power amplifier. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 389–392, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11069
Surface‐wave propagation along a metamaterial slab
Authors: Cory H. , Barger A. 
Published: July 2003

AbstractSurface‐wave propagation along a metamaterial slab with negative permittivity and permeability is analyzed. The dispersion relations are determined for the TM and TE (odd and even) modes. The Brillouin diagrams are drawn and show that, for odd modes after cutoff, there is an initial frequency range for which there are two possible propagation coefficients. All the even modes exhibit the same behaviour except the first one. In this case a band‐pass region appears, suggesting that the device could be used as a filter. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 392–395, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11070
Contention resolution by shared wavelength converters and fiber delay lines in an optical packet switch
Authors: Yi Li , Ghafouri‐Shiraz H. 
Published: July 2003

AbstractContention resolution techniques greatly affect the architecture and performance of an optical packet switch (OPS). Fiber delay lines (FDLs) and wavelength converters which can resolve the contention problem and provide acceptable performance, have been demonstrated in many OPS designs. However, the large hardware volume of the optical components limits the integration and scalability of the OPS system. In this paper, we propose a design that can efficiently utilize the wavelength converters and use a very limited number of FDLs. The performance of the proposed design has been evaluated by simulation. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 395–398, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11071
Narrow flat metal‐plate antenna for dual‐band WLAN operation
Authors: Fang Chi‐Yin , Tung Hao‐Chun , Su Saou‐Wen , Wong Kin‐Lu 
Published: July 2003

AbstractA novel dual‐band antenna made of a narrow, rectangular, flat metal plate for wireless local area network (WLAN) operation in the 2.4‐ and 5.2‐GHz bands is presented. The antenna comprises a larger radiating arm, a smaller radiating arm, and a shorting portion. The larger and smaller radiating arms control a lower resonant mode at about 2.4 GHz and an upper resonant mode at about 5.2 GHz, respectively, and are connected to each other through the shorting portion. The antenna is easily excited by using a 50Ω mini coaxial line and shows good antenna performance. The proposed antenna design is described and experimentally studied. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 398–400, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11072
Genetically engineered multiband high‐impedance frequency selective surfaces
Authors: Kern Douglas J. , Werner Douglas H. , Wilhelm Michael J. , Church Kenneth H. 
Published: July 2003

AbstractA methodology is presented for the design synthesis of metamaterials that act as thin multifrequency artificial magnetic conductors. These structures are realized by placing a frequency‐selective surface above a conventional prefect electric conductor, separated by a thin dielectric layer. The frequency‐selective surface design is optimized using a micro‐genetic algorithm to operate at multiple, narrow frequency bands. Two examples of genetically engineered multiband high‐impedance frequency‐selective surfaces (that is, artificial magnetic conductors) are presented and discussed. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 400–403, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11073
Near fields evaluated with the wave concept iterative procedure method for an E‐polarisation plane wave scattered by cylindrical strips
Authors: Raveu N. , Vuong T. P. , Terrasse I. , Piau G.‐P. , Baudrand H. 
Published: July 2003

AbstractThe wave concept iterative procedure (WCIP), already improved for planar circuits, is developed in this paper for cylindrical structures. The WCIP method has been applied with success to the scattering of an E‐polarisation plane wave on cylindrical strips. The results are in good agreement with previous works in the literature, and the calculation time involved is quite reasonable. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 403–406, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11074
Flexible polymer light‐emitting devices based on ruthenium complexes
Authors: Wang Tzyy‐Jiann , Chen Chiu‐Hui , Chang Shu‐Mei , Tzeng Yih‐Jing , Chao Yu‐Chou 
Published: July 2003

AbstractPolymer light‐emitting devices (PLED) using ruthenium complexes doped in the polymer blend of PVK and PBD on the flexible substrate are presented. The effects of dye‐doping concentration and polymer blend thickness on the device performance are discussed. By using ruthenium complexes, the flexible PLED exhibits improved color purity and device stability. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 406–409, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11075
Determination of conductor loss of multilayer‐coupled microstrip lines for CAD application
Authors: Verma A. K. , Nasimuddin  
Published: July 2003

AbstractBy modifying and adopting the incremental inductance rule, in association with the variational method in the Fourier domain, and using the single layer (SLR) formulation, we present a fast and accurate method to compute the conductor loss of a multilayer‐coupled microstrip line with and without shield. The accuracy of the method has been tested against several full‐wave methods. The conductor loss of many useful structures is compared. The method is valid for conductor thickness t > 1.11 skin depth. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 409–415, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11076
Compact combined antenna with dual dipolar‐type radiation
Authors: Delaveaud C. , Brocheton C. 
Published: July 2003

AbstractTwo dipolar radiating sources have been combined in a compact structure to provide a dual orthogonal omnidirectional coverage. A dual‐port antenna configuration using this concept has been designed to operate at I.S.M. 2.4‐GHz frequency band. Experimental results concerning S parameters and radiation characteristics are compared to simulation results. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 415–418, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11077
A semivectorial method for the modeling of photonic crystal fibers
Authors: De Francisco C. A. , Borges B. V. , Romero M. A. 
Published: July 2003

AbstractThis paper presents a versatile finite‐difference‐based method, formulated in terms of the simultaneous over‐relaxation (SOR) technique, for the modeling of photonic crystal fibers. The dispersion characteristics of such fibers are obtained and the results are compared with previously published data with excellent agreement. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 418–421, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11078
A new aperture‐coupled patch antenna
Authors: Cheng C. H. , Li K. , Tang K. F. , Matsui T. 
Published: July 2003

AbstractA new aperture‐coupled patch antenna is presented, in which the patch is surrounded by a conductor ground and the sides of the dielectric substrate are covered with conductor walls. The antenna was investigated numerically and experimentally. Result shows that the antenna has a bandwidth of about 28% (for |S11| ≤ −10 dB) centered at 10 GHz and an average gain of about 7.4 dBi over the operating frequency range, which are better than that of a conventional aperture‐coupled patch with the same parameters. At the same time, the antenna maintains a good radiation pattern. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 422–423, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11079
Simulated annealing algorithm applied in optimum design of optical thin‐film filters
Authors: Huang H. C. , Hsu M. H. , Chen K. L. , Huang J. F. 
Published: July 2003

AbstractThis method shows the superiority of designing DWDM filters by using the idea of simulated annealing algorithm. By applying this method, the spectral transmittance and reflectance curves of these filters all effectively achieve their desired optical performances. Although the design procedure is concentrated on 1550‐nm band, in general, this method can be applied to arbitrary frequency bands. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 423–428, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11080
3D near‐field model for uniform slanted fiber gratings
Authors: Jáuregui C. , Cobo A. , López‐Higuera J. M. 
Published: July 2003

AbstractA 3D near‐field model for a uniform slanted fiber Bragg grating (FBG) is presented. This model, based on antenna theory, allows for the calculation of the radiated near field in the space surrounding a fiber that contains a tilted uniform fiber Bragg grating. Radiation patterns can also be obtained. The model has been successfully checked via experiments. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 428–432, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11081
Novel radical‐responsive MRI contrast agent based on paramagnetic liposomes
Authors: Gløgård Christian , Stensrud Gry , Aime Silvio 
Published: July 2003

AbstractA novel, radical responsive MRI contrast agent based on a gadolinium chelate conjugated to a liposome through a disulfide linker was synthesized, with the aim of pursuing the in vivo mapping of radicals. The liposome was prepared by incorporating a thiol‐activated phospholipid, which was subsequently reacted with a gadolinium chelate containing a free thiol group. The long reorientational motion of the supramolecular adduct endows the paramagnetic agent with a relaxivity significantly higher than that of the free complex. The disulfide bond represents a radical‐sensitive moiety and a large decrease in contrast efficacy (T1 relaxivity) is shown upon its cleavage. A preliminary assessment of the system was made by means of in vitro gamma‐irradiation and thiol–disulfide bond exchange with dithiothreitol. Both methods showed a clear dose‐dependent decrease in T1‐relaxivity. Copyright © 2003 John Wiley & Sons, Ltd.