bluuebunny/crossref_metadata_2025_split huggingface dataset:
Time domain modeling of electromagnetic wave propagation in Tellegen media
Authors: Barba I. , Grande A. , Cabeceira A. C. L. , Represa J. 
Published: June 2003

AbstractA time‐domain solution of electromagnetic wave propagation in Tellegen materials is presented. The angle tilt between electric and magnetic fields, the phase speed of the wave, and the intrinsic impedance are computed when the medium is excited with a monochromatic source. The results are in good agreement with theoretical predictions. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 167–168, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11004
Particle swarm optimization for reconfigurable phase‐differentiated array design
Authors: Gies Dennis , Rahmat‐Samii Yahya 
Published: June 2003

AbstractMultiple‐beam antenna arrays have important applications in communications and radar. This paper describes a method of designing a reconfigurable dual‐beam antenna array using a new evolutionary algorithm called particle swarm optimization (PSO). The design problem is to find element excitations that will result in a sector pattern main beam with low side lobes with the additional requirement that the same excitation amplitudes applied to the array with zero phase should result in a high directivity, low side lobe, and pencil‐shaped main beam. Two approaches to the optimization are detailed. First, the PSO is used to optimize the coefficients of the Woodward–Lawson array synthesis method. Second, the element excitations will be optimized directly using PSO. The performance of the two methods is compared and the viability of the resulting designs are discussed in terms of sensitivity to errors in the excitation. Additionally, a parallel version of the particle swarm code developed for a multi‐node Beowulf cluster and the benefits that multi‐node computing bring to global optimization will be discussed. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 168–175, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11005
Thin absorbing structure for all incidence angles based on the use of a high‐impedance surface
Authors: Tretyakov S. A. , Maslovski S. I. 
Published: June 2003

AbstractIt is shown that thin mushroom layers (high‐impedance surfaces realized as regular arrays of small patches at a small distance from a metal surface) can be used as radar‐absorbing structures whose performance does not change with the incidence angle for TM‐polarized waves. The key role of the vias connectors between the patches and the ground plane is explained, and potential performance demonstrated in examples. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 175–178, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11006
LTCC broadband deep embedded interconnects (DEI) with application for embedded bandpass filter
Authors: Yu J. J. , Tan B. T. , Chew S. T. 
Published: June 2003

AbstractCareful design of via transitions intended for use in practical microwave applications is needed to realize the advantages of low‐temperature co‐fired ceramic (LTCC), such as highly integrated buried passive circuits. Grounded coplanar waveguide (GCPW) to asymmetrical stripline vertical interconnects is optimized for thick LTCC substrate. The focus is to develop a vertical transition through thick substrate supporting deep embedded interconnects (DEI). The measured results demonstrate vertical transitions with good performance up to 20 GHz. Embedded LTCC bandpass filter with such vertical transition has been demonstrated with an insertion loss of 2.2 dB and return loss better than −20 dB at 16.2 GHz. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 179–181, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11007
A comprehensive study and modeling of centre‐tap differentially driven single‐turn integrated inductors for 10‐GHz applications
Authors: Lim S. F. , Yeo K. S. , Ma J. G. , Do M. A. , Geng C. Q. , Chew K. W. , Chu S.‐F. 
Published: June 2003

AbstractThis paper presents a complete characterization of single‐turn differentially driven high‐quality (Q) factor inductors at 10 GHz. The separate characterization of individual physical dimension through a series of 3D electromagnetic (EM) simulations allows us to evaluate their effects on the inductor's Q and inductance L separately. The results show that single‐turn inductors can generate Q greater than 20 at 10 GHz with inductance L at the sub‐nano Henry range. Finally, a lumped‐element equivalent circuit of the inductor was developed for predicting associated Q, L, and frequency behavior. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 182–185, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11008
A compact bandpass filter using microstrip slow‐wave open‐loop resonators with high impedance lines
Authors: Oh Soonsoo , Kim Youngsik 
Published: June 2003

AbstractIn this paper, a bandpass filter using a microstrip slow‐wave open‐loop resonator with high impedance lines is presented. This resonator has the high impedance of a loaded microstrip line, which significantly increases not only the slow‐wave effect but also the dispersion effect. These effects result in the reduction of its size and the widening of an upper stop‐band region compared to that of a conventional microstrip slow‐wave open‐loop resonator with a low impedance line. The new proposed filter and conventional filters are simulated and tested. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 185–187, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11009
On the relationship for the monostatic modulated fundamental scattering technique
Authors: Azaro Renzo , Caorsi Salvatore , Pastorino Matteo 
Published: June 2003

AbstractIn the monostatic modulated scattering technique for the measurement of electromagnetic fields, the reflected voltage is found to be proportional to the square amplitude of the unperturbed field at the probe position. In this paper, this fundamental relationship is simply derived by using the Lorentz reciprocity theorem and the concept of minimum scattering antenna. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 187–190, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11010
New CPW low‐pass filter based on a slow wave structure
Authors: Martín F. , Falcone F. , Bonache J. , Lopetegi T. , Laso M. A. G. , Sorolla M. 
Published: June 2003

AbstractA new periodic loaded coplanar waveguide (CPW) low‐pass filter with very sharp cutoff has been designed and fabricated. The device consists of a CPW structure with T‐shaped periodic patterns on both the central strip and ground planes. With such a design, capacitive coupling is added between the signal strip and ground planes at periodic positions, resulting in a filtering action and slow‐wave effect. In addition to a sharp cutoff, the device exhibits very low insertion loss in the pass band, wide rejection bandwidth, and simple design and fabrication. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 190–193, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11011
On the field patterns of the dominant mode in unilateral finline by the finite‐element method
Authors: Lu Mai , Leonard Paul J. 
Published: June 2003

AbstractIn this paper, the field patterns of the dominant mode in unilateral finline are calculated by the hybrid finite‐element method. Dependence of the field patterns on thickness of metallic fins and dielectric constant of dielectric substrate are presented. The figures in this paper have important values in the design of finline millimeter wave integrated circuits. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 193–195, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11012
A novel single‐layer patch antenna for GSM/DCS dual‐band operation
Authors: Liu Ting Hua , Zhang Wen Xun 
Published: June 2003

AbstractA novel dual‐band single‐layer patch antenna that covers the bands of 890–960 MHz for GSM and 1710–1880 MHz for DCS, with VSWR ⩽ 2:1, is presented. This antenna consists of a ground plane, air spacing (without dielectric substrate), and a metal patch layer printed on a thin substrate with lower permittivity. The performances simulated by using Ansoft Ensemble 8.0 software are bandwidth for the GSM band (9.22%) and 730 MHz for DCS band (40.56%). The simulated and experimental results are compared. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 195–198, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11013
A sparse matrix iterative approach for modeling tree scattering
Authors: Ding Kung‐Hau , Tsang Leung 
Published: June 2003

AbstractIn this paper we present a computational electromagnetic model for tree scattering at VHF/UHF frequencies. A structure model with dielectric cylinders is being used to simulate trees with bare branches. The method of moments (MoM) solution of the volume integral equation is computed for the tree scattering signature. An efficient numerical algorithm based on the sparse matrix iterative approach (SMIA) is used to solve the matrix equation. The SMIA decomposes the impedance matrix into a sparse matrix for the near interactions, and a complementary matrix for the far interactions among the cylindrical sub‐cells of the tree structure. Using a direct sparse solver to estimate the strong interaction part, we iteratively include the weak interaction contribution in order to update the solution. The key feature of the SMIA approach is that very little iteration is required to obtain convergent solutions. We have applied the SMIA tree scattering model to calculate scattering from various simulated trees with up to several hundreds of branches. Solutions obtained from the SMIA method agree very well with the solutions obtained using exact matrix inversion and the conjugate gradient method (CGM). Compared to the CGM, the SMIA approach reduces the number of iterations by a factor of more than a hundred and provides a much faster numerical solution scheme for computing tree scattering. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 198–202, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11014
Effect of ESD injection locations on induced noise inside a shielded enclosure
Authors: Chan K. H. , Fung L. C. , Leung S. W. 
Published: June 2003

AbstractElectrostatic discharge (ESD) on the metallic enclosure of electronic products normally generates unwanted radiated electromagnetic interference (EMI). The radiated EMI penetrates through the apertures on the enclosure and then couples to the circuitries inside the enclosure. This may cause malfunction and signal errors to the circuitries. In this paper, an experimental investigation on the effects of induced noise level caused due to different injection locations of ESD on the metallic enclosure with different aperture sizes is carried out. Results show that the induced voltage is highly sensitive to injection location of ESD. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 203–206, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11015
Extended (FD)2TD formulations for lumped elements
Authors: Chen R. S. , Yung Edward K. N. , Chan C. H. 
Published: June 2003

AbstractCurrently extended finite‐difference time domain (FDTD) formulations require the permittivity and conductivity to be independent of frequency. However, for many real materials of interest, these parameters vary significantly with frequency. The extended frequency‐dependent finite‐difference time domain (FD)2TD method makes it possible to analyze hybrid integrated circuits with lumped element within dispersive medium by combining lumped parameters (R, C, or L) and frequency‐dependent dielectric substrate in the algorithm. This method allows the full‐wave analysis of virtually hybrid integrated circuits and gets parameters with a wide frequency range with one simulation. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 206–209, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11016
Simple analysis of the frequency modes for microstrip ring resonators of any general shape and correction of an error in the literature
Authors: Hsieh Lung‐Hwa , Chang Kai 
Published: June 2003

AbstractUnlike the conventional magnetic‐wall model, a simple transmission‐line model unaffected by boundary conditions is used to calculate the frequency modes of ring resonators of any general shape such as annular, square, or meander. Moreover, it corrects an error in the literature concerning the frequency modes of the one‐port ring resonator. Also, it can be used to describe the dual‐mode behavior of the ring resonator, which the magnetic‐wall model cannot address well, especially for a ring resonator with complicated boundary conditions. Experiments show good agreement with theory. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 209–213, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11017
Scattering by screw heads in reflecting surfaces and their effect on the sidelobes of reflector antennas
Authors: Yang Jian , Kildal Per‐Simon 
Published: June 2003

AbstractScrews are often used to fasten the main reflector of a reflector antenna to its support structure. The screw heads may then cause bumps in an otherwise smooth reflector surface. Thereby, they disturb the reflected fields and cause increased sidelobes. In this paper, a perturbation theory is introduced in order to calculate efficiently the increased sidelobes due to scattering from the screw heads. Screw heads are approximated as half spheres, whereby it becomes very efficient to calculate the scattering from them by using a spherical wave expansion algorithm, GIDMULT. This method has been verified by measurements in a low sidelobe antenna. We also describe some ways to reduce the scattering, such as dielectric coating of the screw heads and optimization of their locations. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 213–217, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11018
Compact internal quad‐band antenna for mobile phones
Authors: Ang Irene , Guo Yong‐Xin , Chia M. Y. W. 
Published: June 2003

AbstractA novel compact internal quad‐band handset antenna for covering GSM900, DCS1800, PCS1900, and ISM2450 bands is presented. Details of the antenna are discussed along with measured and simulated results. The simulation is based on the FDTD method. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 217–223, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11019
Diversity dual‐band planar inverted‐F antenna for WLAN operation
Authors: Wong Kin‐Lu , Chen Yen‐Yu , Su Saou‐Wen , Kuo Yen‐Liang 
Published: June 2003

AbstractA printed diversity dual‐band planar inverted‐F antenna (PIFA) mounted vertically at the edge of a PCMCIA network card (such that the protruded portion of the network card from the housing of the laptop has a minimum length) for WLAN operation in the 2.4‐GHz band (2400–2484 MHz) and 5.2‐GHz band (5150–5350 MHz) is presented. The diversity antenna studied comprises two back‐to‐back stacked PIFAs and has a low profile of 10 mm to the network card. Across the two operating bands, the measured reflection coefficient S11 and isolation S21 are all less than −14 dB (1.5:1 VSWR) and −24 dB, respectively. In addition, the measured radiation patterns of the two stacked PIFAs in general cover complementary space regions, thereby making it possible for providing spatial diversity for WLAN operation. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 223–225, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11020
Relationship between the propagation characteristics of via and microstrip connecting angle
Authors: Ji Wusheng , You Bin , Wang Xuedong , Li Ying 
Published: June 2003

AbstractThe microstrip‐via‐microstrip is a popular interconnect structure in multilayer circuits at microwave frequency. The microstrip connecting angle is an arbitrary angle due to layout and technical error. The relationship between the propagation characteristics of via and the microstrip connecting angle was analyzed by using the Ansoft simulator. The obtained results have important application value for the design of a similar multilayer circuit. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 225–228, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11021
Studies on crossover and broadside‐coupled microstrip bandstop filters
Authors: Yang Ning , Chen Zhi Ning , Wang Yun Yi , Chia M. Y. W. 
Published: June 2003

AbstractTwo kinds of two‐layer microstrip structures, including crossover and broadside‐coupled microstrip lines, and their equivalent circuits, are studied based on a quasi‐static analyzing method. The shorting vias from the bottom strips to the ground planes are introduced to achieve bandstop. Simulated and measured results show the validity of the proposed structures and their CAD models for the design of bandstop filters. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 228–231, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11022
Modeling and design of interdigital capacitor based on neural networks and genetic algorithm
Authors: Chen R. S. , Zhang X. , Tsang K. F. , Yung K. N. 
Published: June 2003

AbstractIn this paper, a novel approach is described to design an interdigital capacitor (IDC) using artificial neural networks (ANNs) and genetic algorithm (GA). The scattering parameters of the training samples are computed by the finite‐difference time‐domain (FDTD) and ANN is applied to describe the models of IDC. According to the engineering requirement, the dimensions of IDC can be designed with GA using the trained ANN models. This design procedure is proved to be time saving and of high accuracy. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 231–235, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11023
Antenna‐coupled VOx thin‐film microbolometer array
Authors: González F. J. , Abdel‐Rahman M. , Boreman G. D. 
Published: June 2003

AbstractTwo‐dimensional arrays of log‐periodic antenna‐coupled microbolometers were fabricated using VOx and Nb thin films as bolometric materials, which have different temperature coefficients of resistance. Noise, response, and angular characteristics of both types of microbolometer arrays were measured and compared. VOx‐based devices presented a 4.5× better response and 5.5× better signal‐to‐noise ratio than Nb‐based devices. Radiation patterns show that a further increase in response can be obtained by better matching the VOx bolometer to the antenna elements. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 235–237, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11024
A novel accurate PEEC‐based 3D modeling technique for RF devices of arbitrary conductor‐magnet structure
Authors: Long Haibo , Feng Zhenghe , Feng Haigang , Wang Albert 
Published: June 2003

AbstractThis paper presents magPEEC, a new 3D electro‐magnetic modeling technique that extends the existing PEEC approach to analyze arbitrary conductor‐magnet structures by accounting for fictitious magnetized currents on a magnetic material surface. Applications for magnetic‐cored/layered spiral inductors demonstrate validity and accuracy of magPEEC. Possible solutions to improve RF IC inductors using magnetic cores are discussed. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 237–240, 2003; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.11025
GSM base‐station antenna built using composite materials technology
Authors: Borowiec R. , Słobodzian P. 
Published: June 2003

AbstractThis paper presents some aspects concerning the use of composite materials for manufacturing microstrip antenna arrays, along with key problems related to the incorporation of such materials into antenna design. As an example, an integrated microstrip antenna array with electrically down‐tilted beam for the GSM900 system is described. The applicability of composite materials technology has been proven by mechanical strength test and electrical parameter measurement results, which are also briefly reported herein. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 240–244, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11026
A dual‐frequency triangular chip antenna for WLAN operation
Authors: Lee Gwo‐Yun , Chen Wen‐Shyang , Wong Kin‐Lu 
Published: June 2003

AbstractThis article presents a dual‐frequency triangular chip antenna suitable for WLAN operation in the 2.4‐GHz band (2400–2484 MHz) and 5.2/5.8‐GHz bands (5150–5350 MHz/5725–5875 MHz). The proposed triangular chip antenna in this study comprises a right‐angle, isosceles triangular FR4 base of thickness 1.6 mm and area 72 mm2 and, on the top surface of the FR4 base, a metal line pattern with two branch radiating strips is printed, which generates two separate wide resonant modes for the desired dual‐frequency WLAN operation. Experimental results of a constructed prototype mounted on one of the corners of a grounded substrate (about the size of a compact flash card) are presented and discussed. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 244–247, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11027
The effect of stimulated Raman scattering in WDM‐based IP backbone
Authors: Tang Junhua , Zhang Liren , Siew Chee‐Kheong 
Published: June 2003

AbstractThis paper focuses on the power depletion due to stimulated Raman scattering in a WDM link when bursty IP traffic is directly loaded. The actual power penalty due to stimulated Raman scattering is shown to be dependent on IP traffic load. The statistics of the power depletion due to stimulated Raman scattering under various traffic loading conditions are obtained and compared with the stimulated Raman scattering effect under the worst‐case assumption. This provides useful information for the network designers to adjust the power of input light accordingly so that significant improvement in the performance of IP over WDM can be achieved. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 247–249, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11028
Comments on “On the analysis of a weakly guiding doubly clad dielectric optical fiber with an annular core”
Authors: Marcou J. , Février S. 
Published: June 2003

AbstractA discussion of the dispersion relation of the modes guided by an annular core fiber is done in order to prove that the fundamental mode has a zero cutoff. It also gives the inequalities satisfied by the cutoff frequencies of the first lower modes. A relation is established between the propagation constants of two modes with the same radial order but different azimuthal orders. It allows us to precisely set the conditions for these constants to be almost similar. Numerical results are shown to confirm these assertions. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 249–254, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11029