bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of inductive frequency selective surfaces by the method of moments with entire‐domain basis functions
Authors: Don Nataliya , Bozzi Maurizio , Kirilenko Anatoly , Perregrini Luca 
Published: September 2007

AbstractThis study presents an efficient method for the analysis of thick metal screens perforated periodically with apertures (inductive frequency selective surfaces). The analysis is based on the Method of Moments with entire‐domain basis functions. The peculiarity of the proposed approach is the particular calculation of the basis functions in the case of arbitrarily shaped apertures. The method is validated through the comparison with published data and is applied to the design of a new dual‐band filter. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2929–2932, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22923
A microstrip antenna using patch array resonator
Authors: Kim D. , Kim M. , Tanaka M. , Matsugatani K. 
Published: September 2007

AbstractA new planar antenna using two‐dimensional patch array resonator for an improved‐bandwidth performance is presented. The antenna, designed to work at 6.8 GHz on a 1.27‐mm‐thick substrate with a dielectric constant of 9.8, has a total size of 314 mm2. The measurements showed a 6‐dB frequency bandwidth of 12.9%, which is a significant improvement over the 3.3% bandwidth measured from a 40 mm2 single‐patch reference antenna. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2926–2928, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22924
A wideband 8‐element omnidirectional array for wireless system
Authors: Wu Dakui , Zhao Minghua , Fan Yong , Zhang Yonghong 
Published: September 2007

AbstractA smart broad‐band planar antenna for wireless system is presented. The simple modeling of this antenna and design method based on equivalent circuits has been developed. An eight‐element planar array has been designed, fabricated and measured. Measured results exhibit good performance of the return loss and horizontal plane radiation pattern. The measured 10‐dB return loss bandwidth of the broad‐band planar array is demonstrated to be 62.5% and the un‐roundness of its horizontal plane pattern is less than 4.5 dB. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2944–2946, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22925
Optimal design of ultra wideband antennas using a mixed model of 2‐D genetic algorithm and finite‐difference time‐domain
Authors: Ding Min , Jin Ronghong , Geng Junping 
Published: September 2007

AbstractA mixed model of two‐dimensional (2‐D) genetic algorithm and finite‐difference time‐domain is applied to the automatic design of ultra wideband (UWB) planar antennas in a finite size. The results illustrate that the method is valid and a new UWB antenna is designed successfully in the small size. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3177–3180, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22928
Printed compact S‐shaped monopole antenna with a perpendicular feed for penta‐band mobile phone application
Authors: Wu Chih‐Hsien , Wong Kin‐Lu 
Published: September 2007

AbstractA printed compact S‐shaped monopole antenna for penta‐band mobile phone application is presented. The S‐shaped monopole antenna has a uniplanar structure and can be printed on an FR4 substrate of small size 10 × 45 mm2 to achieve a compact configuration. By mounting the antenna above the top edge of the system ground plane of the mobile phone and feeding it using a perpendicular feed, the antenna occupies a small volume in the top portion of the mobile phone. This makes it especially suited for application in the thin mobile phone in which the embedded internal antenna is required to be small in occupied volume and narrow in width. In addition, the antenna can generate two wide operating bands at about 900 and 2000 MHz to cover the GSM850/900 and DCS/PCS/UMTS operation, respectively. Details of the proposed antenna are presented. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3172–3177, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22929
Design of dual‐band bandpass filter using stepped impedance resonator and defected ground structure
Authors: Chen Wu‐Nan , Chia Wei‐Kuo , Yang Cheng‐Fu , Shih Chih‐Liang 
Published: September 2007

AbstractThis article presents a novel microstrip dual‐band bandpass filter (BPF) comprising a symmetrically‐bent, open‐loop, square‐ring stepped impedance resonator (SIR) on the upper surface and a symmetrical U‐shaped defected ground structure (DGS) on the lower metallic ground plane. A center frequency of 2.45 GHz is obtained for the first passband of the BPF by adjusting the dimensions of the SIR, while a center frequency ranging from 5 to 7 GHz is obtained for the second passband by adjusting the dimensions of the DGS unit. The experimental and simulation results demonstrate that the insertion losses of the BPF are −1.4 dB at 2.45 GHz, −1.3 dB at 5.75 GHz, and −4.1 dB at 5.2 GHz. The characteristics of the proposed BPF with and without the DGS unit are compared, and the dependency of the second resonance frequency on the dimensions of the DGS unit is discussed. Finally, the effectiveness of etching an additional DGS unit beneath the feed lines to suppress the high out‐of‐band harmonic frequencies is also demonstrated. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3099–3103, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22933
A hybrid approach for modeling stochastic ray propagation in stratified random lattices
Authors: Martini Anna , Franceschetti Massimo , Massa Andrea 
Published: September 2007

AbstractThe present contribution deals with ray propagation in semi‐infinite percolation lattices consisting of a succession of uniform density layers. The problem of analytically evaluating the probability that a single ray penetrates up to a prescribed level before being reflected back into the above empty half‐plane is addressed. A hybrid approach, exploiting the complementarity of two mathematical models in dealing with uniform configurations, is presented and assessed through numerical ray‐tracing‐based experiments to show improvements upon previous predictions techniques. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3068–3073, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22934
An efficient technique to lower the error due to the truncation of the scanning region in a bipolar facility
Authors: D'Agostino F. , Ferrara F. , Gennarelli C. , Guerriero R. , Riccio G. , Savarese C. 
Published: September 2007

AbstractAn efficient technique is developed in this article to extrapolate the near‐field data falling outside the measurement region in the bipolar scanning. It is based on the nonredundant sampling representations of the electromagnetic field and on the optimal sampling interpolation expansions. The singular value decomposition method is properly employed for estimating the external data. This allows one to reduce in a significant way the truncation error occurring in the near‐field–far‐field transformation with bipolar scanning. Numerical examples assessing the effectiveness of the technique are shown. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3033–3037, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22936
2D EIT for biomedical imaging: Design, measurement, simulation, and image reconstruction
Authors: Lim Kim Hwa , Shi Guining , McCarter Kyle , George Rhett , Ybarra Gary , Joines William T. , Wartenberg Scott , Liu Qing Huo 
Published: September 2007

AbstractA 2D electrical impedance tomography (EIT) system has been developed at Duke University as an experimental system to test the forward and inverse algorithms for EIT application. The forward model is based on the 2nd‐order finite element method (FEM), while the image reconstruction is based on the distorted Born iterative method (DBIM). The major contributions of this work are the application of the higher‐order FEM as a forward solver, and the DBIM as an inverse solver to the integrated EIT system. The forward model has been validated with the measured data to within 0.5% accuracy. Excellent images have been reconstructed with these collected EIT data sets. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2989–2998, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22938
V‐band corrugated metal antenna for Giga‐bit wireless applications
Authors: Fusco V. , Romanek D. , Nair B. 
Published: September 2007

AbstractIn this article we describe the design and performance of a waveguide‐fed corrugated surface wave antenna for use in the 57–62 GHz V‐band wireless communication band for HD video hook‐up. The antenna dimensions are calculated using standard closed form leaky‐wave formulae for infinitely wide corrugations. The actual structure which has finite corrugations is simulated using HFSS with good agreement to measurement. The final structure has a mid‐band return loss of −8 dB and the antenna, exhibits ∼4.2‐dB gain at 60° above the horizontal plane. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2953–2956, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22940
A miniaturized millimeter‐wave branch‐line coupler using nonsymmetrical T‐shape structure with quasi‐stepped impedance resonator
Authors: Shiau Miin‐Shyue , Yuan Shih‐Yi , Liao Shry‐Sann , Sun Pou‐Tou , Liu Don‐Gey 
Published: September 2007

AbstractIn this study, a novel ka‐band compact‐size branch‐line coupler was proposed. The coupler was designed and fabricated with WIN Semiconductors 0.15‐μm pseudomorphic high electron‐mobility transistor process. The design method, simulation data, and measurement results of the proposed coupler were also discussed. The coupler occupied less than 45% of the circuit area compared with conventional design at 30 GHz, and did not implement any lumped elements via‐hole grounding, and bonds wire, making it simpler to design, easier to fabricate, and lower cost. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2950–2953, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22941
Patch fed 2D planar Luneburg lens
Authors: Xue L. , Fusco V. F. 
Published: September 2007

AbstractA simple means using rectangular patch antennas to feed a 2D planar Luneburg lens is presented. The lens together with the patch launching system is modelled using commercial 3D electromagnetic software. The −23 dB return loss, better than −20 dB port to port isolation of the patches, as well as 15 dB antenna gain and 5.3° −3 dB H‐plane (lens plane) beamwidth indicate excellent lens performance potential at 23.3 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2922–2924, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22942
Electrothermally‐actuated RF‐MEMS suspended parallel switch
Authors: Girbau David , Pradell Lluís , Lázaro Antonio , Nebot Àlvar 
Published: September 2007

AbstractThis article presents an electrothermally‐actuated lateral resistive‐contact RF‐MEMS parallel switch for application to low GHz wireless communication bands. The device is driven by a metal electrothermal actuator, which achieves large displacements and contact forces at much lower temperatures than conventional polysilicon electrothermal actuators. It was manufactured on a standard low‐resistivity substrate and its RF performance was improved by suspending the structures 25 μm from the substrate. Measured (at 1 GHz) insertion loss is −0.11 dB, return loss −41 dB, and isolation −22 dB. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2894–2896, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22943
Design and optimization of microstrip passive circuits by field‐based equivalent circuit model with aggressive space mapping
Authors: Tang Wanchun , Zhou Puke , Chen Xuemei , Chow Y. Leonard 
Published: September 2007

AbstractThe field‐based equivalent circuit model is applied to the design and optimization of microstrip passive circuits with aggressive space mapping (ASM) technique. The field‐based equivalent circuit model is taken as coarse model, whereas the commercial software IE3D is used as the fine model. Three practical passive components, i.e., two low‐pass filters and a power divider are designed by the field‐based equivalent circuit model with ASM. Good convergence performance is achieved for the designs of all examples. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2889–2893, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22944
A real‐time monitoring photopolarimeter based on a multichannel signal process system
Authors: Twu Ruey‐Ching 
Published: September 2007

AbstractThis study developed and evaluated a photopolarimeter based on a polarization interferometer with four photo detectors. By using the proposed multichannel signal process system, the time varying polarization states of an incident light beam, modulated by an electrically driving liquid crystal cell, can be measured instantly and monitored continually. Research findings contribute to the study of dynamic behaviors of the liquid crystal cell. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3093–3096, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22947
Microstrip leaky‐wave antenna with beam‐patterns switchable capability
Authors: Li Yuanxin , Xue Quan , Yung Edward Kai‐Ning , Long Yunliang 
Published: September 2007

AbstractA beam‐patterns switchable microstrip leaky‐wave antenna (MLWA) is presented in this letter. A new feeding configuration of MLWA has been shown. MLWA fed with two feeding terminals on different sides radiates out single‐beam radiation patterns. Through controlling SPDT switch, the beam‐patterns change from single‐beam mode to dual‐beam mode. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3060–3063, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22949
Spectrum conversion phase‐locked loops used for 43 Gbit/s 3R optical receivers
Authors: Wang Xinyue , Wang Ziyu 
Published: September 2007

AbstractOn the basis of a novel spectrum conversion phase‐locked loop, this article presents a method to recover a 10.709‐GHz synchronized clock from an optical signal of 42.84 Gbit/s (NRZ 27–31–1) and demonstrates a 43 Gbit/s 3R optical receiver based on the spectrum conversion PLL. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3017–3020, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22951
Impedance improvement of miniature UWB antenna
Authors: Cheng Jui‐Nan , Deng Sheng‐Ming , Tsai Ching‐Long , Bor Sheau‐Shong 
Published: September 2007

AbstractThis article presents the performance of impedance improvement of miniature ultra‐wideband (UWB) antenna on a printed circuit board (PCB). The proposed antenna has a reflection coefficient below −10 dB in the frequency range of 3.2–10.6 GHz. Most important of all, it simultaneously also has a very good impedance matching below −14 dB for the frequency range from 4.0 GHz to 10.6 GHz. Because of the performance of extra good impedance matching, it can be suitable to be utilized in different environments for the actual UWB applications to overcome the impedance variation. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2982–2983, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22952
Analysis of crosstalk degradation in polarization division multiplexing system due to polarization dependence loss and gain
Authors: Perlicki K. 
Published: September 2007

AbstractA simple method of the calculation of the crosstalk between two polarization multiplexed channel in an optical fiber link including polarization dependence loss and polarization dependence gain is presented. This method allows a significant simplification of the calculation of crosstalk in polarization multiplexed transmission systems. The analytical results are compared with numerical results. This comparison gives good agreement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2915–2918, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22956
Neural network approach to determine nonsmooth one‐dimensional profiles in inverse scattering theory
Authors: Yaman Fatih , Simçsek Serkan 
Published: September 2007

AbstractIn this article, we present a new hybrid method to reconstruct one‐dimensional lossy profile in order to get effective and stable solutions that can be used for both acoustic and electromagnetic cases. Unlike classical integral equation methods for the solution of the inverse medium problems, the neural network approach is applied to avoid the nonlinear and ill‐posed nature of the integral equation of the first kind. The applicability and the effectiveness of the method is tested by selecting an inverse problem, namely, to determine nonsmooth one‐dimensional profile of an inhomogeneous layer located over an inhomogeneous impedance ground. To reveal the advantage and the accuracy of the method, noisy data and rectangular/triangular types of non‐smooth profiles are used. Good agreement with exact profiles has been observed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3158–3162, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22958
Coaxially fed monopoles in shorted waveguides
Authors: Park Mi Y. , Eom Hyo J. 
Published: September 2007

AbstractAn efficient series solution for coaxially fed monopoles in a shorted parallel‐plate waveguide is presented. The analysis is based on mode‐matching and image method. A coaxially fed monopole in a shorted rectangular waveguide is considered as a special case. Computations are performed to verify the validity of solution. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3145–3148, 2007; Published online in Wiley Inter‐Science (www.interscience.wiley.com). DOI 10.1002/mop.22959
A 3.1 to 5 GHZ CMOS RF transmitter for direct‐sequence code division multiple access applications
Authors: Ku Bon‐Hyun , Park Bonghyuk , Hong Songcheol 
Published: September 2007

AbstractAn ultra‐wideband RF transmitter with local oscillator (LO) leakage reduction method for direct‐sequence code division multiple access (DS‐CDMA) is presented. To achieve ultra‐wideband gain flatness, the method of combining two shunt‐peaking loads with different resonant frequencies is used. A double balanced mixer with a linear transconductance stage is used to increase the linearity of the mixer. To reduce the LO leakage at the output port, an additional DC feedback loop is applied to the linear transconductor. Measurement results show 9.5 dB gain with ±0.8 dB variation over 3.1–5 GHz range. The output P1dB is approximately −3 dBm and the output IP3 is more than 9.8 dBm for a frequency greater than 3–5 GHz. By the LO leakage reduction method, the LO leakage output power is 5 dB lower than without it. The transmitter consumes 54 mW with a 1.8 V supply and is realized with a 0.18 μm RF CMOS technology. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3140–3145, 2007; Published online in Wiley Inter‐Science (www.interscience.wiley.com). DOI 10.1002/mop.22960
An accurate analysis of numerical dispersion for 3‐D ADI‐FDTD with artificial anisotropy
Authors: Srivastava Kumar Vaibhav , Mishra Vishwa V. , Biswas Animesh 
Published: September 2007

AbstractIn this article, an accurate numerical dispersion relationship is developed for 3‐D alternating direction implicit finite difference time domain (ADI FDTD) with artificial anisotropy. The numerical dispersion relation with accurate mathematical model helps to calculate the anisotropic parameters, which are used to control the error of the numerical phase velocity. Numerical example shows that the proposed method helps to reduce the numerical dispersion significantly. The effects of anisotropic parameters on the numerical dispersion with different mesh resolution, courant number, and cell dimension ratio, are shown for three‐dimensional anisotropic ADI‐FDTD. A comparison has been made for anisotropic ADI FTDD and conventional ADI FDTD in terms of accuracy and CPU time for the calculation of resonant frequencies of rectangular cavity. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3109–3112, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22961
High performance all‐optical wavelength conversion based on nonlinear polarization rotation assisted with red‐shifted filtering
Authors: Feng Chuanfen , Wu Jian , Zhang Junyi , Xu Kun , Lin Jintong 
Published: September 2007

AbstractA wavelength conversion scheme based on nonlinear polarization rotation (NPR) assisted with red‐shifted filtering is presented at the rate of 20 Gbit/s by simulation and experiment. Simulated analyses and experimental results show that high performance wavelength conversion based on NPR can be achieved using a red‐shifted filtering scheme. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3078–3082, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22963
Improvement of microstrip low pass filters' characteristics using an optimized number of new multi‐ring defected ground structures
Authors: Boutejdar A. , Elsherbini A. , Haiwen Liu , Omar A. 
Published: September 2007

AbstractA novel two square split ring resonators defected ground structure (DGS) is investigated for use in low pass filters (LPF) design. An equivalent circuit and parametric study for the DGS are presented. The DGS is employed in a LPF to obtain very wide reject band. The measured results illustrated the excellent performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3074–3078, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22964
Research and fabrication of a UV curable polymeric 41 × 41 array‐waveguide grating multiplexer
Authors: Chen C. M. , Zhang X. Z. , Zhang H. M. , Zhang D. , Mu S. K. , Hou A. L. , Zhang X. L. , Li L. , Zhang D. M. 
Published: September 2007

AbstractIn this article, a polymeric 41‐channel array‐waveguide grating (AWG) multiplexer was fabricated by simple direct Ultraviolet photolithography process. We try to use a cross‐linkable negative photoresist as core material and an optically clear UV curable epoxy as cladding material. Once exposed to Ultraviolet light through a photomask, the polymeric waveguide stripes were obtained upon development. Because of the superiority of UV resist in microelectro mechanical systems, the characteristic of the optical waveguide is better than that fabricated by steam‐redissolution technique of polymeric waveguide. The propagation loss is low as 2.03 dB/cm at 1550‐nm wavelength. The AWG multiplexer has channel spacing of 0.789 nm and the center wavelength is close to 1550 nm. The new technique will be well suited for fabricating optical integrated circuits. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3040–3044, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22965