bluuebunny/crossref_metadata_2025_split huggingface dataset:
Power reflectance measurements of metal meshes and grids using a quasi‐optical resonator
Authors: Kapilevich B. , Gover A. , Eliran A. 
Published: March 2005

AbstractThis paper presents a novel approach developed for the measurement of the power reflectance of metal meshes and wire grids using a quasi‐optical resonator. It is based on the reconstruction of a grid's reflectance from the resonance curve of a quasi‐optical resonator. The model of the resonator loaded by a mesh has been developed to provide direct reconstruction of its reflectance. A comparison of the measured results with data obtained in free‐space measurements has shown good agreement. Examples of reflectance measurements of both conventional and twin‐shaped meshes are presented to illustrate the technique suggested. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 185–188, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20765
Band‐notched ultra‐wideband circular‐disk monopole antenna with an arc‐shaped slot
Authors: Wong Kin‐Lu , Chi Yun‐Wen , Su Chih‐Ming , Chang Fa‐Shian 
Published: March 2005

AbstractBy embedding a simple arc‐shaped slot in a circular‐disk monopole antenna, an ultra‐wideband (UWB, 3.1–10.6 GHz) operation with a controlled notched frequency band can be obtained. The arc‐shaped slot is placed close to the boundary of the circular‐disk monopole and has a length of about one‐half wavelength of the desired notched frequency. The proposed slotted circular‐disk monopole antenna showing UWB operation with a notched frequency band for rejecting the 5.8‐GHz WLAN band is demonstrated. The effects of the dimensions of the arc‐shaped slot on the notched frequency band are also analyzed. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 188–191, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20766
On the estimation of scattering from convex conducting cylinders
Authors: Chumachenko Vitaliy P. 
Published: March 2005

AbstractA novel approach for estimating the high‐frequency field scattered by a convex conducting cylinder is proposed. The theory is based on the locality property of short‐wave scattering and considers the curvature of the target and the shadow‐side currents. The approach is more accurate than the physical optics (PO) approximation and requires PO‐comparable computational costs. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 191–194, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20767
Design and signal‐integrity analysis of a backplane for high‐speed digital systems
Authors: Zhang Hua , Hong Wei , Wang Yuanqing , Wang Wei , Hu Jinsong , Wang Haiming , Yang Guangqi , Zhang Nianzu , Cui Tiejun 
Published: March 2005

AbstractThe design of a backplane in high‐speed digital systems is presented, with an emphasis on systematic analysis of the signal integrity using full‐wave electromagnetic methods when the system carries high‐speed digital signals. The simulation and measurement results in both the frequency and time domains are presented for a high‐speed digital‐circuit demo system at the data rate of 500 M/bs, and are in good agreement. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 194–199, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20768
A new look at FDTD excitation sources
Authors: Su Tao , Yu Wenhua , Mittra Raj 
Published: March 2005

AbstractIn FDTD simulations, the excitation sources can be divided into two categories: (i) the displacement‐current source, which is generated by a time‐varying electric field; (ii) the induced‐current source, which exists in the lossy material. Currently, the latter source is the popular choice in most FDTD simulations. However, there are two problems with the use of this source: the time signal shape at the observation points is different from that of the input pulse, and an artificial DC component is introduced into the solution that prevents the solution from converging to zero. The objective of this paper is to investigate these excitation sources and to clarify some concepts in FDTD simulations. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 203–207, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20770
Nonradiative dielectric waveguide embedded in metamaterial with negative permittivity or permeability
Authors: Yang Ping , Li Duochuan , Wu Ke 
Published: March 2005

AbstractA nonradiative dielectric waveguide (NRD) embedded in a metamaterial with negative permittivity or permeability is proposed and theoretically characterized in this work. This dielectric waveguide structure is inherently nonradiating at bends and discontinuities, since metamaterials with negative permittivity or permeability cannot support any propagating modes. The waveguide supports hybrid longitudinal section magnetic (LSM) and longitudinal section electric (LSE) modes. It is demonstrated that the LSM11 mode is the lowest‐order mode when the waveguide dimensions are properly designed. The theoretical results indicate that this guided‐wave structure is able to narrowly confine electromagnetic fields within the core dielectric strip, thus exhibiting nonradiating properties. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 207–210, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20771
CPW feed to rectangular DRA
Authors: Ghosh Bratin , Antar Yahia M. M. , Petosa Aldo , Ittipiboon Apisak 
Published: March 2005

AbstractCharacteristics of uniplanar feed topologies for the dielectric resonator antenna (DRA) based on the CPW are presented. The dual‐resonance characteristics of the capacitive feed are discussed. A comparison of the CPW capacitive, square‐loop, and inductive feeds shows that the real‐estate requirements and radiation patterns are strongly influenced by the feed type. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 210–216, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20772
Phase‐noise measurement of free‐running microwave voltage‐controlled oscillators
Authors: Ng Hoi‐Yee , Tsang Kim‐Fung , Yuen Chung‐Ming 
Published: March 2005

AbstractThis paper reports an efficient method to measure the phase noise of free‐running microwave voltage‐controlled oscillators using a general‐purpose spectrum analyzer. The system tracks the frequency drifting signal by using a charge pump phase‐locked loop. The measurements taken on a 1.9‐GHz oscillator demonstrates the system accuracy. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 216–217, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20773
3D scalar FDTD method for waveguides with circular symmetry
Authors: Lu Changgui , Cui Yiping 
Published: March 2005

AbstractA 3D scalar finite‐difference time‐domain (FDTD) method in cylindrical coordinates is formulated in order to analyze the wave propagation in circularly symmetric waveguides. The 2nd‐order Mur's absorbing boundary condition (ABC) is provided as well. This method can be used to simulate the propagation and coupling between the modes in a multimode waveguide structure. An isotropic point source propagating in either a symmetric medium or multimode step‐index fiber and a plane‐source propagation in multimode fiber are simulated in this paper. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 218–221, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20774
Miniaturization of hairpin bandpass filters using high‐permittivity substrate
Authors: Huang Cheng‐Liang , Hsu Cheng‐Hsing , Tsai Chih‐Ming 
Published: March 2005

AbstractThe miniaturization of hairpin bandpass filters by employing two high‐permittivity ceramic substrates (with respective dielectric constants of 9.7 and 20) are investigated. Microwave dielectric ceramics with high permittivity are commonly applied in several microwave communication components. With the advantages of compact size, high‐permittivity ceramics can be used as the substrate for bandpass filters. Moreover, the fundamental characteristics of newly developed compact stepped‐impedance hairpin resonators with parallel coupled lines have also been described and applied to the design of bandpass filters. In this paper, the designed mixed‐coupled structures are simulated using an IE3D simulator. The responses of the fabricated filters using Al2O3(εr= 9.7,Q×f= 350000 GHz) and MgNb2O6(εr= 20,Q×f= 110000 GHz) ceramic substrates are designed at a center frequency of 2 GHz. The compact size and performance of this class of filters are demonstrated. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 222–225, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20776
Wideband quarter‐wave patch antenna with a single‐layer capacitive feed on a finite ground plane
Authors: Joubert J. , Odendaal J. W. 
Published: March 2005

AbstractThe design and radiation characteristics of a wideband quarter‐wave patch with a single‐layer capacitive feed are presented. The E‐plane radiation pattern of the antenna is shown to be very dependent on the size of the ground plane, and the results for two extreme cases are obtained in order to illustrate this effect. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 225–227, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20777
L‐strip‐fed wideband rectangular dielectric resonator antenna
Authors: Menon Sreedevi K. , Lethakumary B. , Bijumon P. V. , Sebastian M. T. , Mohanan P. 
Published: March 2005

AbstractIn this paper, the advantages of using L‐shaped microstrip feed to excite a rectangular dielectric resonator antenna (DRA) by electromagnetic coupling are presented. This feeding technique enhances the bandwidth and gain of the antenna without affecting its size. The experimental results are validated using Fidelity software based on the finite‐difference time‐domain (FDTD) method. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 227–228, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20778
Application of active electromagnetic bandgaps to the design of tunable resonators in CPW technology
Authors: Gil I. , Bonache J. , García‐García J. , Martín F. 
Published: March 2005

AbstractCapacitively coupled resonators with wide tuning range have been proposed in coplanar waveguide (CPW) technology, based on the concept of electromagnetic bandgaps (EBGs). By loading the resonator with shunt‐connected varactor diodes, the phase velocity of the line and, hence, the resonant frequency of the structure can be electrically controlled. Due to the slow‐wave effect related to the presence of the varactors, a certain level of miniaturization is also achieved. Moreover, the frequency‐selective properties of EBGs are used to reject the first spurious frequency of the resonators. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 229–232, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20779
Mode‐converting vacuum windows in circular waveguides: Analysis and synthesis in the case of axially symmetric modes
Authors: Tkachenko V.I. , Yashina N.P. 
Published: March 2005

AbstractA rigorous mathematical model of electromagnetic‐wave scattering by a complicated axially symmetric resonator‐type junction in a circular waveguide is developed. The efficiency, accuracy, and stability of the solution and its numerical implementation provide a robust numerical tool for the synthesis of the waveguide unit with required characteristics. Extensive numerical experiments result in the design of a matching vacuum window possessing the features of an H02 ⇒ H01 mode converter. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 233–237, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20780
Analysis of parallel coupled‐line bandpass filters using a ground‐plane aperture
Authors: Zhang Zhenyu , Guo Yong‐Xin , Ong Ling Chuen , Chia M. Y. W. 
Published: March 2005

AbstractParallel coupled‐line bandpass filters using the ground‐aperture technique are analyzed in this paper. A design guide and design curves for this kind of coupled‐line bandpass filter on commonly used high‐ and low‐permittivity substrates are presented. Based on the proposed design curves, two sample bandpass‐filter configurations are designed. The design is simulated using Ansoft HFSS and validated by the measurements. Good agreement between the simulated and measured responses is obtained. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 237–240, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20781
Characteristic parameters for CPWs on a very thin dielectric layer
Authors: Zhao Ji‐Xiang 
Published: March 2005

AbstractIn this paper, approximate analytical expressions for characteristic parameters of CPWs on a very thin dielectric layer are given. The “crowding phenomenon” that occurs during the process of conformal mapping is overcome. Combining these expressions with the partial‐capacitance method, the characteristic parameters for CPWs on a multidielectric layered substrate are computed and are found to agree well with the test data. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 240–241, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20783
A K‐band inverted microstripline‐fed linear tapered slot antenna and its 16‐element E‐plane array
Authors: Wu Chen 
Published: March 2005

AbstractAn inverted microstripline‐fed linear tapered slot antenna element and a design of its 16‐element E‐plane array are presented in this paper. The element is designed using the finite‐difference time‐domain (FDTD) method. The calculated results show that it has a wide‐impedance bandwidth in the K‐band. To investigate the E‐plane array, the return loss at each element input port, the couplings among elements, and the array's radiation patterns are obtained using the FDTD method. Using a unique three‐piece assembled structure, the array is fabricated and tested experimentally. The measured results show that it has a wide bandwidth and antenna efficiency. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 241–246, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20784
Temperature dependence of light polarization in active erbium‐doped fiber
Authors: Quintela M. A. , Madruga F. J. , López‐Amo M. , López‐Higuera J. M. 
Published: March 2005

AbstractExperimental results on the temperature dependence of the polarization state of the amplified optical signal between 0°C and 50°C are reported in this paper for an erbium‐doped fiber amplifier. The instabilities of the polarization state decrease with increasing temperature when pumped at 1480 nm. The rates are reported. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 246–249, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20785
Diode large‐signal characteristics measurement for high‐power rectennas
Authors: Xu Junshu , Xu Changlong , Xu Deming , Yang Xuexia 
Published: March 2005

AbstractIn this paper, an Agilent 8722ES Network Analyzer with option 085 is configured to directly measure the diode large‐signal characteristics. A set of smart microstrip calibration standards corresponding to this measurement system is also designed. Using the measured nonlinear equivalent‐circuit parameters of the diode, a matching circuit is designed to improve the power conversion efficiency from RF to DC, at an input power level of 90 mw and 200Ω load, and a maximum conversion efficiency of 70% was achieved at frequency of 9.75 GHz. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 249–251, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20786
A class of novel compact filters with quasi‐hairpin structure using stepped‐impedance resonators
Authors: Liao Shry‐Sann , Chen Hsien‐Ku , Liao Hsien‐Yuan , Chang Yin‐Cheng 
Published: March 2005

AbstractA class of novel compact filters with quasi‐hairpin structure using stepped‐impedance resonators (SIRs) is presented. The SIR open stub is used as the loaded structure for the filter design with the merit of small size and sharp transition band (TB). Additionally, these filters achieve sharp TB for lowpass filters (LPFs) and improved selectivity for bandpass filters (BPFs) at 2.45 GHz. All of the filters retain the dimensions of the circuit by more than 60%, as compared to the conventional one. These filters are very useful for applications in wireless‐communication systems. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 251–255, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20787
Simulation, fabrication and testing of a left‐handed microstrip coupler
Authors: Tan Y. S. , Rao X. S. , Chen L. F. , Tan C. Y. , Ong C. K. 
Published: March 2005

AbstractA broadband left‐handed parallel‐line microstrip coupler is implemented by both electromagnetic simulation and actual fabrication. The circuit dimensions are smaller and more compact than those in previous studies and a thinner Duroid substrate of thickness h = 0.635 mm is used. Parametric studies were performed using IE3D, and fabrication was done via a Quick Circuit 7000 prototyping machine. The network‐analyser measurements indicate broad bandwidth coupling in the 6.5–7.7‐Ghz region. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 255–258, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20788
Applications of the Z‐Y T‐chart for nonreciprocal stub tuners
Authors: Torrungrueng D. , Thimaporn C. 
Published: March 2005

AbstractImpedance matching is a part of the design process for a microwave system to achieve the maximum power delivered to the load. In this paper, nonreciprocal single‐stub and double‐stub matching networks are studied graphically using a generalized Smith chart, called the T‐chart, developed for nonreciprocal transmission lines. The stubs can be connected in series or in parallel with the main feed line. Basic procedures and concepts for nonreciprocal stub tuners are similar to those of reciprocal ones. It is found out that the “forbidden region” for double‐stub shunt tuners, where the load cannot be matched, is independent of the phase angle ϕ of associated characteristic impedances of nonreciprocal transmission lines. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 259–262, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20789
Computer‐aided numerical characterization and experimental studies for high‐power operation of IMPATT oscillators
Authors: Kar Subar 
Published: March 2005

AbstractA computer‐aided numerical characterization is done for oscillator properties on the basis of large‐signal modeling of IMPATT diodes supported by experimental studies, in order to select suitable parameters for high‐power operation of IMPATT oscillators. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 262–265, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20790
An internal ultra‐wideband metal‐plate monopole antenna for UMTS/WLAN dual‐mode mobile phone
Authors: Hsiao Fu‐Ren , Wong Kin‐Lu 
Published: March 2005

AbstractA novel compact ultra‐wideband (UWB) metal‐plate monopole antenna for mobile‐phone applications is presented. The antenna is easily fabricated from a single metal plate and is suitable to be embedded within the casing of a mobile phone as an internal antenna. Further, the antenna shows a wide operating bandwidth of about 6 GHz (about 1.9–7.9 GHz), which makes it easily cover the UMTS band (1920–2170 MHz) for mobile communications and the 2.4‐GHz (2400–2484 MHz) and 5.2/5.8‐GHz (5150–5350/5725–5875 MHz) bands for WLAN communications. That is, the antenna is suitable for application in a UMTS/WLAN dual‐mode mobile phone. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 265–268, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20791
Research on highly Yb3+‐doped passive mode‐locked fiber ring laser
Authors: Xiu‐Jiang Huang , Zhan Sui , Yong‐Zhi Liu , Ming‐Zhong Li , Hong‐Huan Lin , Jian‐Jun Wang , Xin Li , De‐Shuang Zhao , Hai‐Yan Chen 
Published: March 2005

AbstractTheoretical and experimental results on the self‐starting passive mode‐locked Yb fiber‐ring laser generating short pulse are reported. The relations between the laser‐cavity parameters and mode‐locked pulse characteristics are discussed. 980‐nm LD‐pumped laser is used as the pump source and high‐concentration Yb3+‐doped fiber is adopted as the gain medium. Using the nonlinear polarization rotation (NPR) effect of the fiber, a self‐starting stable mode‐locked pulse is obtained, with a center wavelength of 1046 nm, a 3‐dB bandwidth of 6.01 nm, and a 20‐dB bandwidth of 16 nm. The mode‐locked threshold power is 150 mW and output power is 26 mW with a 20‐MHz repetition rate. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 269–270, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20792
Metastatic malignant melanoma presenting as pancytopenia in a three‐year‐old boy
Authors: Spiller Susan E. , Hawkins Douglas S. , Finn Laura S. , Sze Raymond W. , Sybert Virginia 
Published: March 2005

AbstractMalignant melanoma is rare in childhood and has never been reported to cause pancytopenia due to bone marrow metastases in a child. We report a 3‐year‐old boy with a large congenital melanocytic nevus who presented with bone pain and pancytopenia due to diffuse bone and bone marrow infiltration with metastatic melanoma without an identifiable primary site. Despite treatment with imatinib mesylate there was no response and the patient died with progressive disease. This case illustrates an unusual presentation of bone marrow failure secondary to malignant melanoma in a young child with symptomatic metastatic marrow infiltration, a rarely reported site of melanoma involvement in adults or children. Pediatr Blood Cancer 2005; 45:60–63. © 2005 Wiley‐Liss, Inc.
Main chain thermotropic liquid crystalline polyurethanes containing biphenyl mesogens based on novel AB‐type self‐polycondensation route: FT‐IR and XRD studies
Authors: Ranganathan T. , Bhoje Gowd E. , Ramesh C. , Kumar Anil 
Published: March 2005

AbstractThe detailed mesophasic characterization of main chain liquid crystalline polyurethanes containing biphenyl mesogen, which were synthesized by the novel AB‐type self‐polycondensation approach, was carried out by using Differential Scanning Calorimetry (DSC), Polarized Optical Microscopy (POM), variable temperature X‐ray Diffraction (XRD), and Fourier Transform Infrared (FT‐IR) spectroscopic studies. The type of mesophase present in these polymers was identified to be the smectic A phase by POM and XRD studies. The smectic layer thickness was found to increase as the length of the spacer increased. The effect of temperature on the hydrogen bonding was analyzed by FT‐IR studies. The curve‐fitting analysis of the NH stretching and CO stretching modes of vibrations indicated a gradual decrease in hydrogen bonding during the transition from the crystalline state to the mesophase. The mesophase to isotropic liquid transition was then accompanied by the complete disappearance of the hydrogen bonding. The biphenyl bands also showed changes during phase transitions due to the coupling of biphenyl vibration modes with the urethane linkage attached to it. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 1903–1912, 2005