bluuebunny/crossref_metadata_2025_split huggingface dataset:
A new domain decomposition finite‐difference time domain for solving large electromagnetic problems
Authors: Abd‐El‐Raouf Hany E. , Mittra Raj , Ma Ji‐Fu 
Published: September 2006

AbstractIn this paper, we present a novel domain decomposition finite‐difference time domain technique for solving large electromagnetic radiation and scattering problems. In this method the computational domain is divided into manageable, moderate‐sized subdomains with overlapping regions. PML layers are used for terminating the subdomains to absorb the outgoing waves. The tangential electric fields are stored on an interface plane to be used as a boundary condition to generate the field in the adjacent subdomain. These computations are applied in a serial manner to solve a problem that is too large to be solved in one step because of limitations in the available computational resources. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2399–2405, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21962
Analysis of inclined slot‐loaded patch for dual‐band operation
Authors: Vishvakarma Shivnarayan , Vishvakarma Babau R. 
Published: September 2006

AbstractThe theoretical analysis of a single feed inclined slot‐loaded rectangular microstrip patch antenna is presented using modal expansion cavity model and circuit theory concept. By cutting the inclined slot along the radiating edge of the patch, a dual‐frequency operation is obtained. The input impedance, VSWR, and return loss are calculated. It is found that the frequency ratio of two resonant frequencies can be varied from 1.92 to 2.44 by the inclination angle of the slot. The theoretical results are validated by experimental results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2436–2441, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21965
Experimental study on frequency selective surface with gangbuster array
Authors: Qing Anyong 
Published: September 2006

AbstractExperiment provides the most convincing justification of numerical studies. A frequency selective surface (FSS) with Type‐2 gangbuster array is fabricated and measured. The measurement results agree well with numerical results. An FSS with regular y‐directed dipole array is also fabricated and measured. The bandwidth of the former is observed much wider than that of the latter. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2421–2425, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21967
An all‐fiber multi‐wavelength Raman laser based on a PCF sagnac loop filter
Authors: Chen Daru , Qin Shan , Shen Lingfang , Chi Hao , He Sailing 
Published: September 2006

AbstractA Sagnac loop filter based on the birefringence of a photonic crystal fiber is used to demonstrate an all‐fiber multi‐wavelength Raman fiber laser. Stable lasing at multi‐wavelengths is achieved and the power distribution among different lasing wavelengths can be tuned by adjusting the pump powers. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2416–2418, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21968
A radiator element for active phased array antenna
Authors: Seong Nak‐Seon , Park Seong‐Ook 
Published: September 2006

AbstractThis paper is concerned with selection and design of an antenna element of a phased array antenna for 20 GHz communications satellite. For this purpose, a new type of dual‐mode horn with inner choke ring at the excitation region is proposed. Also, measured results compared with predicted data for the dual‐mode horn radiator with a circular polarizer are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2393–2395, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21971
Magnetic loading of EBG AMC ground planes and ultrathin absorbers for improved bandwidth performance and reduced size
Authors: Kern D. J. , Werner D. H. 
Published: September 2006

AbstractThis paper demonstrates the advantages of magnetic loading within the substrate of an electromagnetic bandgap (EBG) surface. A conventional EBG surface has been shown to act as an artificial magnetic conductor over a narrow bandwidth. This paper demonstrates that by magnetic loading of the substrate, increased operating bandwidth is achieved for each resonant frequency. In addition, previous research has revealed that an ultrathin electromagnetic absorber design can be obtained by introducing loss into the frequency selective surface of an EBG absorber. It is now shown that a further reduction in thickness is possible by including a small amount of magnetic permeability within the dielectric substrate material. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2468–2471, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21972
Wideband circular wire mesh and annular ring monopole antennas
Authors: Ray K. P. , Kumar G. , Anob P. 
Published: September 2006

AbstractTwo new configurations of circular wire mesh and annular ring monopole antennas have been investigated and the results are compared with the corresponding circular disc monopole antenna. For the wire mesh monopole antenna of diameter 26 cm with peripheral metal strip, the measured bandwidth for voltage standing wave ratio ≤ 2 has been obtained from 258 to 5240 MHz, which has a bandwidth ratio of 20.3:1. For annular ring monopole with outer diameter of 26 cm and inner diameter 14 cm, the measured band width for voltage standing wave ratio ≤ 2 has been obtained from 245 to 5275 MHz leading to 21.5:1 bandwidth ratio. These new configurations have less wind loading and weight as compared to circular disc monopole antenna. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2459–2461, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21977
Re‐configurable Kμ dual‐bands slot antenna using mems switches
Authors: Guo Xinglong , Cui Jianming , Cai Miao , Liu Lei , Lai Zongsheng , Xin Peisheng 
Published: September 2006

AbstractReconfigurability in an antenna system is a desired characteristic that has been the focus of much research in recent years. The paper demonstrates miniature re‐configurable antenna designed and fabricated on the high resistivity Si substrate. This antenna can integrate with a novel microelectromechanical systems actuator for reconfiguring the operating frequency and is used for SoC (System on the chip). The switching between the two different frequency bands is achieved through the use of RF‐MEMS switches. According to the open/closed experiment results, when switch is on and off, the antenna operating frequency is 12.3 GHz and 13.1 GHz with low return loss, respectively. The final model radiates at two widely separated frequencies with very similar radiation patterns. The proposed concept can be extended to reconfigurable linear antenna arrays or to more complex antenna structures with large improvements in antenna performance. It is important for the next generation wireless communications and integrated antenna system on the chip. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2413–2416, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21979
Dispersive effective material parameters
Authors: Sjöberg Daniel 
Published: September 2006

AbstractThe author studied how effective material parameters can be defined for Maxwell's equations when taking dispersion into account. The reasoning is based on the concept of dispersion relations, and is consequently primarily concerned with lossless media. The author essentially required that the effective material parameters should produce the same dispersion relations as the heterogeneous problem, which implies that the effective material is primarily connected to the phase velocity of the waves. Material parameters that exhibit only temporal dispersion can be defined if the propagation direction is fixed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2629–2632, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21983
S‐parameter measurements for oblique angles of incidence and Brewster angle studies for metamaterial samples
Authors: Varadan Vasundara V. , Puligalla Swetha , Ro Ruyen 
Published: September 2006

AbstractTo date, most numerical and experimental studies of metamaterials are limited to normally incident plane waves with the magnetic field parallel to the axis of the inductive structure. In this article, the reflected field response of three types of Split Ring Resonator (SRR) media are measured as a function of incident field polarization, angle of incidence and frequency, using an automated free space focused beam measurement system. The measured results are compared with simulated data generated using the experimentally retrieved complex permittivity and permeability tensors from normal incidence measurements. It is concluded that there is no classical Brewster angle (zero reflection for a given angle of incidence). However, we observe a reflection minimum for all angles of incidence in a small range of frequencies close to the plasmon frequency for all orientations of the SRRs for perpendicular polarization. This will indeed have important low observable applications. In parallel polarization, SRR media are transparent for small angles of incidence. For both polarizations, the effect of anisotropy becomes significant as the angle of incidence increases and a significant change in the reflected field is observed. Thus, considering the anisotropic nature of such metamaterials is important when designing applications. In this article, we also independently verify the assumed constitutive models and property retrieval using normal incidence measurements, using oblique incidence scans. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2619–2624, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21986
Excitation of an electrically small metamaterial‐coated cylinder by an arbitrarily located line source
Authors: Arslanagic Samel , Ziolkowski Richard W. , Breinbjerg Olav 
Published: September 2006

AbstractThe problem of an arbitrarily located electric line source radiating in the presence of a metamaterial‐coated cylinder is solved analytically and implemented numerically. Electrically small resonant metamaterial‐coated cylinders are designed that lead to significant enhancements of both the radiated and scattered powers, as compared with the power radiated by the source into free space, as well as the total scattering cross section, as compared with the results obtained for a corresponding cylinder coated with a conventional material. The effects of the dispersion and losses present in the metamaterials are taken into account to study the bandwidth properties of these resonant configurations. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2598–2606, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21990
New low profile cavity‐backed Hilbert slot antenna
Authors: Gentili Guido Biffi , Linari Mariano , Tesi Vasco , Vallecchi Andrea 
Published: September 2006

AbstractIn this paper, the use of a cavity‐backed Hilbert surface as an efficient slot‐like narrowband radiating aperture is suggested, to exploit its own unique electromagnetic characteristics in the context of radio frequency identification (RFID) applications. The proposed meta‐slot antenna (MSA) consists of a Hilbert surface window (HSW) made of a cascade of space‐filling slot inclusions of order three and backed by a very shallow cavity that contributes to its surface impedance and radiation characteristics. A straight longitudinal microstrip line printed on a thin, low permittivity substrate, whose ground plane includes the HSW, feeds the aperture through distributed electromagnetic coupling. As illustrated by simulation results and measurements, the antenna behaves as a magnetic current sheet over a ground plane, with a highly frequency‐selective impedance response and unidirectional radiation pattern. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2577–2581, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21995
Improved scattering matrix method for the analysis of two‐dimensional PBG devices
Authors: Crocco Lorenzo , Cuomo Fabrizio , Isernia Tommaso 
Published: September 2006

AbstractDevelopment of fast, flexible, and accurate methods for the analysis (and design) of photonic crystals devices is a relevant topic in order to optimize existing devices and/or developing new design solutions. Within this framework, in this article, we present an improved version of the scattering matrix method [1] for the evaluation of the electromagnetic behavior of two‐dimensional finite‐extent photonic crystals made of a finite set of parallel dielectric rods. In particular, by relying on features of the fields to be computed within the device and a suitable aggregation into “macrocells”, a considerable reduction of the number of unknowns of the linear system to be solved is achieved. A numerical analysis confirms the accuracy of the proposed method and the remarkable computational benefit. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2564–2570, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21998
Backward waves in a waveguide, filled with wire media
Authors: Nefedov I. S. , Dardenne X. , Craeye C. , Tretyakov S. A. 
Published: September 2006

AbstractThis paper depicts the properties of rectangular waveguides filled with a double wire medium, i.e. a double array of wires, perpendicular to the waveguide walls. Spectra of eigenmodes for structures with wires connected and nonconnected at their intersections are analyzed analytically and numerically. The applicability of the effective medium theory is discussed. Finally, propagation of backward and forward waves below TM and TE modes cutoff are studied. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2560–2564, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21999
Unimodal surface‐wave propagation in metamaterial nonradiative dielectric waveguides
Authors: Baccarelli Paolo , Burghignoli Paolo , Frezza Fabrizio , Galli Alessandro , Lampariello Paolo , Paulotto Simone 
Published: September 2006

AbstractNonradiative dielectric waveguides employing metamaterial media are studied with the aim of obtaining unimodal surface‐wave propagation for the operating low‐loss LSM01mode. Homogeneous isotropicε‐negative media are considered, with a plasma‐like frequency‐dependent relative permittivity. The use of such media allows for obtaining the desired unimodal propagation in suitable frequency ranges, provided that the metamaterial slab thickness and the metal‐plate spacing are sufficiently small. Parametric analyses are performed to determine the attainable frequency bandwidths. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2557–2560, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22000
Verification of impedance matching at the surface of left‐handed materials
Authors: Aydin Koray , Bulu Irfan , Ozbay Ekmel 
Published: September 2006

AbstractImpedance matching at the surface of left‐handed materials (LHM) is required for certain applications including a perfect lens. In this study, we present the experimental and theoretical verification of an impedance‐matched LHM to free space. Reflection characteristics of both one‐dimensional and two‐dimensional LHM were investigated. The reflection was observed to be very low at a narrow frequency range. FDTD simulations and retrieval procedures were used to theoretically verify impedance matching. By varying the number of layers along the propagation direction, the ultralow reflection at specific frequencies was shown to be independent of the sample thickness. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2548–2552, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22003
Waves in 2D anisotropic L‐C lattice metamaterials: Phenomenology and properties
Authors: Brennan E. P. , Schuchinsky A. G. , Fusco V. F. 
Published: September 2006

AbstractAnisotropic metamaterials composed of 2D periodic infinite and finite periodic lattices of lumped inductor (L) and capacitor (C) circuits have been explored. The unique features of wave channeling on such anisotropic lattices and scattering at their interfaces and edges are reviewed and illustrated by the examples of the specific arrangements. The lattice unit cells composed of inductors and capacitors (basic mesh) as well as of assemblies comprised of double series, double parallel, and mixed parallel‐series L‐C circuits are discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2538–2542, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22005
Circuit model and design of silicon‐integrated CRLH‐TLS analogically controlled by MEMS
Authors: Perruisseau‐Carrier Julien , Lisec Thomas , Skrivervik Anja K. 
Published: September 2006

AbstractWe present an integrated composite right/left handed transmission line (CRLH‐TL) phase shifter analogically controlled by means of a MEMS series capacitor. The device is based on coplanar waveguide (CPW) technology and operates at a central frequency of 18 GHz. An accurate and physical circuit model including parasitics inherent to this MEMS realization is presented. We describe the method used to design the presented structure, which consists in a mixed approach using the developed circuit model and full‐wave simulations. The MEMS‐controlled CRLH‐TL has been fabricated and characterized, showing good agreement with predicted performances. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2496–2499, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22014
Plasmonic structures with extraordinary transmission and highly directional beaming properties
Authors: Caglayan Humeyra , Bulu Irfan , Ekmel Ozbay 
Published: September 2006

AbstractWe studied the grating–coupling phenomena between surface plasmons and electromagnetic waves in the microwave spectrum. We first present the experimental and theoretical results of an enhanced microwave transmission though a subwavelength circular annular aperture with and without metallic gratings. We demonstrate that a 145‐fold enhancement factor could be obtained with a subwavelength circular annular aperture that was surrounded by periodic metallic gratings. This was assisted by the guided mode of the coaxial waveguide and by coupling to the surface plasmons. We present the angular transmission distributions from circular annular apertures, and circular annular apertures surrounded by concentric periodic grooves. At the surface mode resonance frequency, the transmitted electromagnetic waves from the subwavelength circular annular aperture surrounded by concentric periodic grooves have a strong angular confinement with an angular divergence of ±3°. We demonstrate that only the output surface is responsible for the beaming effect. Furthermore, we present the field distributions and showed that there is no beaming effect at the off‐resonance frequency. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2491–2496, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22015
Design of compact RFID reader antenna with high transmit/receive isolation
Authors: Son Hae‐Won , Lee Jung‐Nam , Choi Gil‐Young 
Published: September 2006

AbstractA radio frequency identification (RFID) reader antenna with high transmit/receive isolation, which consists of two circularly‐polarized radiating patches, is presented. The high isolation is achieved by the symmetric design of the antenna geometry and proper arrangement of four feed points on the patches, which are fed by branch‐line hybrid couplers. The experimental results show the transmit/receive isolation of more than 36 dB in the 860–960 MHz RFID frequency band. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2478–2481, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22017
Algorithm study of the space transformation factor in the transformed‐space nonuniform pseudo‐spectral time‐domain scheme
Authors: Liu Xiaoping , Chen Yinchao , Wu Xian , Tong Ming‐Sze , Huray Paul G. 
Published: September 2006

AbstractIn this paper, we explore algorithms for an evaluation of the space transformation factor (STF) in the application of the transformed‐space nonuniform pseudo‐spectral time‐domain (TSNU‐PSTD) scheme. We apply these algorithms to both typical propagation problems and scattering analyses. Before implementing the PSTD technique, we first transform nonuniform grids {xi}, {yj}, and {zk} sampled in a real, nonuniform space to uniform ones {ui}, {vj}, and {wk}. Next, we utilize a uniform‐sampled, standard FFT and inverse FFT to calculate spatial derivatives in the space domain of (u, v, w). We then convert the spatial derivatives back to the real space (x, y, z) by simply multiplying space transformation factors (STFs) du/dx, dv/dy and dw/dz. For comparison, we adopt both the Lagrange polynomial interpolation and the cubic spline interpolation to carry out the task. In the Lagrange's case, we evaluate those factors by solving for coefficients of the Lagrange polynomials from a Vandermonde linear system; in the cubic spline algorithm, we calculate the factors after solving for values of the second derivative of the interpolating function from a tridiagonal linear system. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2367–2372, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22018
Short‐circuited microstrip antennas for multiband wireless communications
Authors: Roy J. S. , Chattoraj N. , Swain N. 
Published: September 2006

AbstractThe investigations on short‐circuited microstrip patch antennas, which are able to generate multiple resonance frequencies in the wireless communication bands, are reported. In these antennas, by properly choosing the positions of shorted posts, good impedance matching can be obtained. The multifrequency nature of the shorted patch, theoretically obtained using IE3D software, is verified by measurement. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2372–2375, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22019
Non‐local damage modelling of concrete: a procedure for the determination of model parameters
Authors: Nguyen Giang D. , Houlsby Guy T. 
Published: September 2006

AbstractThis paper presents a procedure for the determination of parameters of non‐local damage models. This is to assure a consistent response of a non‐local damage model, as choice of the internal length and other parameters of the model are varied. Correlations between the internal length and other parameters governing the local constitutive behaviour of the model are addressed and exploited. Focus is put on the relationship between the internal length of the non‐local model and the width of the fracture process zone. Numerical examples are used to demonstrate the rigour of the proposed method. Copyright © 2006 John Wiley & Sons, Ltd.
Peripheral T‐cell lymphoma in a five year old
Authors: Beresford M.W. , Wilkins S. , Ashworth M. , Davidson J.E. , McDowell H. , Cleary A.G. 
Published: September 2006

AbstractWe report a case presenting with persistent pyrexia that led to the diagnosis of peripheral T‐cell lymphoma, a rare malignancy in childhood. The case illustrates diagnostic conundrums in a patient who is not responding as expected to treatment. Pediatr Blood Cancer 2008;50:145–147. © 2006 Wiley‐Liss, Inc.