bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimized phase noise of LC VCO using an asymmetric‐inductance tank in InGaP/GaAs HBT technology
Authors: Yoon Jae‐Ho , Lee Sang‐Hun , Koh Ah‐Rah , Kennedy Gary P. , Kim Nam‐Young 
Published: April 2006

AbstractThis paper describes fully integrated low‐phase‐noise MMIC voltage‐controlled oscillators (VCOs) for an adaptive‐feedback interference‐cancellation system (AF‐ICS). The asymmetric‐ and symmetric‐inductance tank structures were combined with VCOs to obtain VCOs with low‐phase‐noise performance. The asymmetric‐inductance tank VCO (AIT‐VCO) has a tuning range of 261 MHz with an output power of −11.53 dBm at 1.715 GHz. Furthermore, the phase noise of this VCO is −117.3 dBc/Hz and −129.3 dBc/Hz at 100‐kHz and 1‐MHz offset frequencies, respectively. The symmetric‐inductance tank VCO (SIT‐VCO) has a tuning range of 160 MHz with an output power of −15 dBm at 1.664 GHz. Furthermore, the phase noise of this VCO is −102.4 dBc/Hz and −121.9 dBc/Hz at 100‐kHz and 1‐MHz offset frequencies, respectively. Each of these VCOs occupies a total chip area of 0.9 × 0.9 mm2. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1035–1040, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21593
Impedance matching of a loaded microstrip transmission line using parasitic elements
Authors: Matzner H. , Ouzan S. , Moalem H. , Arie I. 
Published: April 2006

AbstractImpedance matching of a loaded microstrip transmission line is performed by using only parasitic elements. By the term “parasitic” matching element we mean that there is no physical connection between the conductors of the matching subsystem and the conductors of the main circuit. We construct a so‐called λ/4 parasitic transformer by adding a dielectric brick above the microstrip line, and another conducting strip above the brick. It is shown that a very good matching performance is achieved with the λ/4 parasitic transformer. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1040–1042, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21594
Compact broadband rectangular microstrip antennas
Authors: Deshmukh Amit A. , Kumar Girish 
Published: April 2006

AbstractCompact and broadband gap‐coupled microstrip antennas using modified variations of the rectangular microstrip antenna (MSA), namely, C‐shaped, shorted L‐shaped, W‐shaped, and square‐ring MSAs, are proposed. These antennas have large bandwidth with a reduced total patch size. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1043–1046, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21595
Modeling the I‐V characteristics of the power microwave FETs with the Angelov model using pulse measurements
Authors: Loo‐Yau J. R. , Reynoso‐Hernández J. A. , Zuñiga J. E. , Hirata‐Flores F. I. , Ascencio‐Ramírez Hugo 
Published: April 2006

AbstractIn this paper, a simple and effective method of extracting the values of the parameters of the Angelov nonlinear I(V) model of GaAs HJ‐FETs is presented. In the proposed method, the coefficients of the function ψ are determined from I(V) pulse measurements, using the least‐squares optimization method. The utility of the proposed method is demonstrated by modeling the I(V) characteristic of the different families of packaged medium‐power GaAs HJ‐FETs designed for mobile communications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1046–1050, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21596
Effective complex permittivity and permeability of composite planar left‐handed transmission‐line metamaterials on CPW
Authors: Gao Jing , Zhu Lei 
Published: April 2006

AbstractWe report the effective complex permittivity and permeability of 1D planar left‐handed transmission‐line metamaterials. These metamaterials are formed on coplanar waveguide (CPW) with simultaneous load of series‐capacitive and shunt‐inductive elements in periodic intervals. By employing our self‐calibrated method of moments (MoM), the effective permittivity and permeability of these 1D metamaterials are numerically derived to illustrate the propagating and evanescent guided‐wave behaviors over a microwave frequency range. We demonstrate that, in a certain frequency band, the permittivity and permeability simultaneously become negative with zero imaginary parts, and the transmission phase of a finite‐extent CPW metamaterial becomes negative, as exhibited by both simulation and measurement. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1050–1052, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21597
Dual‐frequency planar‐fed microstrip patch antenna
Authors: Elsdon M. , Qin Y. 
Published: April 2006

AbstractA dual‐frequency patch antenna with an inset feed in presented and discussed. It is demonstrated that by cutting two slots into one of the radiating edges of a microstrip patch antenna, a dual‐frequency response with a frequency ratio from 1.03 to 2.0 can be achieved. It is also shown that this design is less sensitive to feed position, which allows the use of an inset planar feed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1053–1054, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21598
Analysis of scattering by composite conducting and dielectric bodies using the single integral equation method and multilevel fast multipole algorithm
Authors: Wang P. , Xia M. Y. , Zhou L. Z. 
Published: April 2006

AbstractA single integral equation (SIE) method is developed to analyze the electromagnetic scattering from 3D composite conducting and dielectric bodies. Compared with the conventional coupled integral equation (CIE) method, the SIE method reduces the number of unknowns by a factor of two for dielectric surfaces and has faster convergence for an iterative solution. The multilevel fast multipole algorithm (MLFMA) is incorporated to reduce the computing complexity and memory requirement. The numerical results show that the proposed SIE‐MLFMA method is accurate and efficient. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1055–1059, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21599
Miniaturized elliptic bandpass filter using the novel coplanar double stepped impedance resonators
Authors: Jang Suk‐Hyung , Lee Jong‐Chul 
Published: April 2006

AbstractThis paper presents the design and experimental results of the new miniaturized elliptic coplanar bandpass filter (EC BPF) using two types of double stepped impedance resonators (DSIRs) operating at a center frequency of 1.38 GHz. Miniaturization in the proposed BPF is achieved by connecting the transmission line between the middle of two SIRs contained in a single DSIR and both grounded planes. In addition, bond‐wire bridges connected between both grounded planes (which are needed in various coplanar waveguide structures) are not required. The new four‐pole EC‐DSIR BPF shows good agreement with the simulation data obtained by full‐wave EM simulations using Zeland IE3D ver. 10.06. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1059–1063, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21600
Quasi‐constant‐sensitivity VCO with offset‐tuning PN junction varactor array
Authors: Lee Sung‐Huang , Chiang Yueh‐Ta , Chiou Hwann‐Kaeo 
Published: April 2006

AbstractA quasi‐constant‐sensitivity voltage‐controlled oscillator (VCO) using an offset‐tuning junction varactor array is demonstrated with low standard deviation of 4.5 MHz/V and average sensitivity of 41 MHz/V. The varactor array utilizing PN‐junction varactors provides high‐linear capacitor‐voltage response and low sensitivity variation. The VCO has a figure‐of‐merit (FOM) value, FOMKvco, of 0.11 and phase noise of −120 dBc/Hz at 1‐MHz offset. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1063–1066, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21601
Multiwavelength correlator for optical header recognition based on arrays of fibre Bragg gratings
Authors: Aljada Muhsen , Zheng Rong , Alameh Kamal , Al‐Begain Khalid 
Published: April 2006

AbstractWe demonstrate a novel optical correlator for multiwavelength header recognition employing arrays of fibre Bragg gratings (FBGs). One FBG array is used to appropriately delay the entire different header wavelengths, and the others are used as a header bank, in which each one is designed with a different wavelength profile. The proof of principle of the optical correlator is experimentally demonstrated and verified for 4‐bit header patterns at 2.27 Gb/s. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1066–1069, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21602
Multiband diamond shaped Sierpinski gasket monopole antenna
Authors: Mirkamali Ali , Hall Peter S. , Soleimani Mohammad 
Published: April 2006

AbstractA multiband diamond‐shaped Sierpinski gasket monopole antenna is described. The radiation pattern of wideband monopole antennas like the circular‐disk and diamond monopole antennas degrades as frequency increases. In this paper, several cutouts based on the Sierpinski gasket geometry are made in the diamond monopole antenna in order to improve the radiation pattern of the antenna. It is experimentally shown that a multiband diamond‐shaped Sierpinski gasket monopole antenna with a significant improved radiation pattern can be achieved by making cutouts in the diamond monopole antenna. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1069–1073, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21603
Simple derivation of dyadic Green functions of a simply moving, isotropic, dielectric–magnetic medium
Authors: Lakhtakia Akhlesh , Mackay Tom G. 
Published: April 2006

AbstractDyadic Green functions for time‐harmonic fields in a homogeneous, isotropic, dielectric–magnetic medium, moving with constant velocity, are derived by first implementing a simple transformation and then using the dyadic Green functions available for uniaxial dielectric–magnetic mediums. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1073–1074, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21604
Optimization of arbitrarily shaped dielectric axisymmetric horns through finite elements and the annealing algorithm
Authors: Monge Javier , Cid Juan M. , Gil José M. , Zapata Juan 
Published: April 2006

AbstractThis work addresses the design of dielectric axisymmetric horns with arbitrarily shape profile. The optimization is carried out by an adaptive version of the simulated annealing (SA) algorithm. In this way we avoid local minimum. No information about initial shape is introduced. The analysis is performed by a hybrid method based on the segmentation technique, the finite‐element method and a matrix Lanczos–Padè algorithm (SFELP), adapted to problems with axial symmetry. A set of example designs are presented to verify the technique. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1074–1079, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21605
New accurate analytical analyses of shielded planar transmission lines
Authors: Duyar Mehmet , Akan Volkan , Yazgan Erdem , Bayrak Mehmet 
Published: April 2006

AbstractIn order to calculate the quasi‐static TEM parameters of shielded coupled coplanar waveguides (SC CPWs) and shielded broadside‐coupled coplanar waveguides (SBC CPWs), closed‐form analytical formulas are obtained and presented using conformal‐mapping techniques. The variation of electrical parameters with respect to different physical dimensions is observed for each type of transmission lines under investigation. The obtained results are also confirmed by comparison with the results in the literature. Further verification has been realized via Sonnet electromagnetic‐circuit solver software. The proposed method in this study is thus well proved by these compared results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1079–1085, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21606
Scattering and radiation characteristics of step discontinuity in a double‐negative (DNG) slab waveguide operating in the evanescent surface mode
Authors: Huang Meng , Xu Shanjia 
Published: April 2006

AbstractThe scattering and radiation characteristics of a step discontinuity in a double‐negative (DNG) slab waveguide operating in the evanescent surface mode are analyzed by a method which combines the rigorous mode‐matching method with multimode network theory. In the analysis, the radiation problem is transformed into a propagation problem so as to tremendously simplify the calculation procedure. The dispersion properties of the grounded planar DNG slab waveguide for ordinary and evanescent surface modes are examined, from which the left‐hand property of the operating mode is verified. The relative scattered power and radiation pattern of the step discontinuity are given for the first time, from which the backward radiation of the stepped DNG guide is clearly demonstrated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1085–1088, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21607
Use of extended ground plane to improve the performance of a slot‐loop antenna with narrow outer conductor
Authors: Song Yuming , Modro Joseph C. , O'Riordan Pauline , Wu Zhipeng 
Published: April 2006

AbstractThe performance of a slot‐loop antenna with a very narrow outer conductor can be significantly improved by connecting to an extended ground plane whose length is a quarter wavelength. The antenna has a reduced size and wider impedance bandwidth. Simulations have been carried out in the one‐wavelength and two‐wavelength modes and confirmed by experiments. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1088–1092, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21608
A wideband printed planar monopole for mobile handsets
Authors: Lin Shun‐Yun 
Published: April 2006

AbstractThis paper presents the design of a wideband printed monopole antenna with inductance loading. This design introduces a loading inductor aimed at decreasing the lowest frequency of the impedance bandwidth, while adjusting the ratio of the patch's length to width in order to increase the highest frequency. The experimental results all demonstrate that the two techniques play a key role in widening the antenna's bandwidth so that it can cover various wireless communication systems. The design's bandwidth covers the GSM (880–960 MHz), DCS (1710–1880 MHz), PCS (1850–1990 MHz), UMTS (1920–2170 MHz), and ISM (2400–2485 MHz) bands. The experimental results also indicate that the radiation patterns for all operating bands are omnidirectional on the azimuthal plane. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1092–1095, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21609
A new approach to the modeling of Si‐RFIC inductor
Authors: Das N. R. , Mitra Alakananda 
Published: April 2006

AbstractIn this paper, a new and simplified approach is proposed to model a radio frequency integrated circuit (RFIC) inductor in Si technology using Fuzzy Logic. An inductor structure made of a single‐layer metal ring fabricated on a silicon substrate is considered in the present analysis. The resistivity of the substrate layer, the thickness of SiO2 layer, and the frequency are considered as variable input parameters for the proposed model in order to calculate the effective inductance as output. The model results are then compared with the results obtained analytically using an equivalent circuit and reasonably good agreement is found within the scope of the model. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1095–1101, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21610
Ultra‐wideband low noise amplifier using a cascode feedback topology
Authors: Jung Jihak , Yun Taeyeoul , Choi Jaehoon 
Published: April 2006

AbstractAn ultra‐wideband (UWB) low‐noise amplifier (LNA) that consists of two cascode and shunt feedback stages is presented. The measurement results show the maximum gain (S21) of 11.9 dB with the 3‐dB band from 2 to 6.5 GHz and return losses (S11, S22) of less than −7.8 dB from 2 to 11 GHz. In addition, the fabricated LNA achieves the average noise figure (NF) of 4.5 dB from 2 to 10 GHz, which value is much lower than previously reported state‐of‐the‐art UWB amplifiers. The input‐referred 3rd‐order intercept point (IIP3) and the input‐referred 1‐dB compression point (P1dB) of the LNA are achieved as 4 and −5 dBm, respectively, while consuming 27 mW in the 0.18‐μm RF CMOS process. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1102–1104, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21611
Coupling and power dissipation in a coaxially excited TM01l mode cylindrical applicator with a spherical load
Authors: Komarov Vyacheslav V. , Yakovlev Vadim V. 
Published: April 2006

AbstractThis paper presents the results of 3D FDTD modeling of a 915‐MHz cylindrical structure with the TM01l mode excited by a coaxial line and intended for thermal processing of a spherical load (a fruit). Energy coupling is shown to be insensitive to the fruit's type and temperature, but dependent on its size and location and the loop's radius. The patterns of dissipated power are analyzed from the viewpoint of heating uniformity. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1104–1108, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21612
Route discovery with constant memory in oriented planar geometric networks
Authors: Chávez E. , Dobrev S. , Kranakis E. , Opatrny J. , Stacho L. , Urrutia J. 
Published: April 2006

AbstractWe address the problem of discovering routes in strongly connected planar geometric networks with directed links. Motivated by the necessity for establishing communication in wireless ad hoc networks in which the only information available to a vertex is its immediate neighborhood, we are considering routing algorithms that use the neighborhood information of a vertex for routing with constant memory only. We solve the problem for three types of directed planar geometric networks: Eulerian (in which every vertex has the same number of incoming and outgoing edges), Outerplanar in which a single face contains all vertices of the network, and Strongly Face Connected, a new class of geometric networks that we define in the article, consisting of several faces, each face being a strongly connected outerplanar graph. © 2006 Wiley Periodicals, Inc. NETWORKS, Vol. 48(1), 7–15 2006
A linear time algorithm for the reverse 1‐median problem on a cycle
Authors: Burkard Rainer E. , Gassner Elisabeth , Hatzl Johannes 
Published: April 2006

AbstractThis article deals with the reverse 1‐median problem on graphs with positive vertex weights. The problem is proved to be strongly NP‐hard even in the case of bipartite graphs and not approximable within a constant factor (unless P = NP). Furthermore, a linear time algorithm for the reverse 1‐median problem on a cycle with linear cost functions (RMC) is developed. It is also shown that there exists an integral optimal solution of RMC if the input data are integral. © 2006 Wiley Periodicals, Inc. NETWORKS, Vol. 48(1), 16‐23 2006
Numerical simulation of underfill encapsulation process based on characteritsic split method
Authors: Kulkarni Venkatesh M. , Seetharamu K. N. , Azid Ishak Abdul , Aswatha Narayana P. A. , Quadir Ghulam Abdul 
Published: April 2006

AbstractElectronic packaging protects the integrated circuit chip from environmental and mechanical damages. Underfilling encapsulation is an electronic packaging technology used to reinforce the solder joints between chip and the substrate. For better mould design and optimization of the process, flow analysis during the encapsulation process is the first necessary step. This paper focuses on the study of fluid flow in underfilling encapsulation process as used in electronics industry. A two‐dimensional numerical model was developed to simulate the mould filling behaviour in underfilling encapsulation process. The analysis was carried out by writing down the conservation equations for mass, momentum and energy for a two‐dimensional flow in an underfilling area. The governing equations are solved using characteristic based split (CBS) method in conjunction with finite element method to get the velocity and pressure fields. The velocity field was used in pseudo‐concentration approach to track the flow front. Pseudo‐concentration is based on the volume of fluid (VOF) technique and was used to track fluid front for each time step.A particular value of the pseudo‐concentration variable was chosen to represent the free fluid surface which demarcates mould compound region and air region. Simulation has been carried out for a particular geometry of a flip‐chip package. The results obtained are in good agreement with the available numerical and experimental values and thus demonstrate the application of the present numerical model for practical underfilling encapsulation simulations. Copyright © 2006 John Wiley & Sons, Ltd.
Bionics and fractal configurations in structural engineering
Authors: Tesar Alexander 
Published: April 2006

AbstractBionics and fractal configurations mapping the schemes from the nature and adopted in present structural engineering are dealt with in present paper. Theoretical and numerical assessments of such configurations are based on the wave approaches running in neural network models corresponding with the genetic algorithms also appearing in nature. Generalized ultimate behaviour of such configurations and structures is analysed. Some structural applications based on such principles are presented. Copyright © 2006 John Wiley & Sons, Ltd.
Phenylene vinylene‐based electroluminescent polymers with electron transport block in the main chain
Authors: Sun Honghao , Mei Chongyu , Zhou Quanguo , Liu Ze , Ma Dongge , Wang Lixiang , Jing Xiabin , Wang Fosong 
Published: April 2006

AbstractWe report a new route for the design of soluble phenylene vinylene (PV) based electroluminescent polymers bearing electron‐deficient oxadizole (OXD) and triazole (TZ) moieties in the main chains with the aryloxy linkage. Both series of the PV‐based polymers were prepared by Wittig reaction. By properly adjusting the OXD and/or TZ content through copolymerization, we can achieve an enhanced balance of hole‐ and electron injections, such that the device efficiency is significantly improved. Light‐emitting diodes fabricated from P1, P2, P3, P4, P5, P6, and P7 with the configuration of Indium–Tin Oxide (ITO)/Poly (styrene sulfonic acid) doped poly (ethylenedioxythiophene) (PEDOT)/polymer/Ca/Al, emit bright green light with the maximum peak around 500 nm. For the device using the optimal polymer (P4) as emitting layer, a maximum brightness of 1300 cd/m2 at 20 V and a maximum luminance efficiency of 0.325 cd/A can be obtained. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3469–3478, 2006