bluuebunny/crossref_metadata_2025_split huggingface dataset:
Compensation of intermodulation distortion of laser diode by using optoelectronically predistorted signals
Authors: Choi In‐Hyuk , Lee Sang‐Hoon , Kwon Hyuk‐Choon , Choi Young‐Wan , Han Sang‐Kook 
Published: April 2006

AbstractWe have experimentally demonstrated the predistortion scheme for linearization of a laser diode which transmits 1.2‐ and 1.25‐GHz RF signal over single‐mode fiber. The suppression of intermodulation distortion was achieved by using an additional laser diode to realize the predistorted signals. We have shown a 22.5‐dB reduction of the 3rd‐order intermodulation distortion and an 11‐dB improvement in the spurious‐free dynamic range. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1144–1148, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21566
Nonhomogeneous current injection for the enhancement of semiconductor optical amplifier‐based wavelength converters
Authors: Gallep Cristiano M. , Cavalcanti André L. R. , Ribeiro Napoleão , Conforti E. 
Published: April 2006

AbstractExperimental data and calibrated simulations for an enhanced wavelength converter based on semiconductor optical amplifiers cross‐gain modulation are presented. Theoretical results for spectral components along the SOA cavity are discussed and a nonhomogeneous bias current injection profile is suggested with an improvement of 4 dB in the XGM wavelength converted eye‐opening. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1141–1144, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21567
Coherence‐time characterization in a suburban environment
Authors: Ribeiro Antonio Marcelo O. , Conforti Evandro 
Published: April 2006

AbstractAn experimental technique for the coherence‐time characterization of a mobile radio envelope employing the autocorrelation coefficient is presented. Field trials at 836 MHz in a suburban area are carried out using a spectrum analyzer as the acquisition apparatus. Autocorrelation coefficients are calculated from the acquired envelopes and the coherence time is calculated for a 0.5 correlation level. Due to the significant variation of the coherence time with the position of the mobile receiver, cumulative distribution functions of the coherence time are calculated in order to interpret the results. The coherence‐time parameter is estimated from these cumulative distribution functions by computing the value above which the coherence time stays for 90% of time. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1137–1141, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21568
A directivity‐diversity microstrip antenna array in millimeter wave
Authors: Caillet M. , Lafond O. , Himdi M. , Le Garrec L. 
Published: April 2006

AbstractThe purpose of this paper is to report on a microstrip reconfigurable antenna in the millimeter‐wave range. This antenna has directivity diversity and is based on a four‐element array. An original method is outlined to guarantee matching for each configuration without changing circuit. Great results have been achieved with a passive prototype and an active antenna is under consideration. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1190–1194, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21569
Detection of dielectric contrast of breast tissues using confocal microwave technique
Authors: Bindu G. , Abraham Santhosh John , Lonappan Anil , Thomas Vinu , Aanandan C. K. , Mathew K. T. 
Published: April 2006

AbstractConfocal microwave technology is explored as a screening tool to detect regions of dielectric contrast in breast tissues. When exposed to microwaves, malignant breast tissues exhibit electrical properties that are significantly different from that of healthy breast tissues, due to the variations of bound water content. In vitro studies of normal breast tissues having cancerous inclusions in the presence of a matching coupling medium are reported here. Experimentally obtained time‐domain results are substantiated by finite‐difference time‐domain analysis. It is observed that the dielectric contrast of breast tissues is satisfactorily determined using the pulsed confocal microwave technique. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1187–1190, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21570
Iterative‐solvers for numerical analysis of photonic devices
Authors: Claudio Kleucio , Rodriguez‐Esquerre V. F. , da Silva J. P. , Hernández M. F. G. , Hernández‐Figueroa H. E. 
Published: April 2006

AbstractAn assessment of four linear‐system iterative solvers is carried out through the simulation of a key 2D photonic crystal structure. Among these solvers, the biconjugate gradient stabilized (BCGS) in conjunction with the incomplete LU (ILU) decomposition, shows the best performance and can be regarded as a promising candidate for large‐scale computation. In addition, the iterative solver with the best performance is applied to analysis of the directional optical coupler and transverse anisotropic waveguide. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1182–1186, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21571
Selective re‐meshing: A new approach to include mode stirring effects in the steady state FDTD simulation of microwave heating cavities
Authors: George Jacob , Bergman Richard 
Published: April 2006

AbstractA new selective remeshing approach to efficiently utilize the finite‐difference time‐domain (FDTD) method for simulating 3D microwave heating cavities with rotating mode stirrers is presented here. The proposed scheme is implemented in a ∼300L multimode applicator and the result compares favorably with a validation experiment. The proposed implementation of the selective remeshing scheme is efficient, in that the remeshing is done “on the fly” and the previous FDTD solution is used to continue the simulation as a single run of the FDTD solver. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1179–1182, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21572
Doppler‐invariant property of hyperbolic frequency modulated waveforms
Authors: Yang J. , Sarkar T. K. 
Published: April 2006

AbstractWhen a target has a large velocity, the Doppler effect is not negligible. In that case, pulse compression by means of a linear frequency modulation suffers from significant signal loss in performance due to the mismatch between the reflected signal and the matched filter caused by the Doppler distortion. This problem can be avoided by using a hyperbolic frequency‐modulated waveform, which has the inherent Doppler‐invariant property. In this paper, we demonstrate that the hyperbolic frequency‐modulated waveform is Doppler‐invariant under the assumption that the target velocity is constant, while for a linear frequency‐modulated waveform it is not. Two numerical examples with rectangular and Gaussian pulse envelopes are presented to compare the performance of these two different modulation schemes under several different levels of Doppler distortions. We also compare the performance of this method with another Doppler‐invariant pulse compressor based on the bipolar waveform and multiple integrator pair. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1174–1179, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21573
Small dual‐frequency shorted patch antenna
Authors: Kan H. K. , Pavlickovski D. , Waterhouse R. B. , Rowe W. S. T. 
Published: April 2006

AbstractIn this paper we present a small dual‐frequency printed antenna based on a square shorted‐patch configuration with an embedded slot to generate the second resonant frequency. The antenna resonance is at 1.58 and 2.6 GHz with 10‐dB return‐loss bandwidths of 1.3% and 3.3% for the lower and higher resonances, respectively. The overall dimensions of the antenna are 0.105λ0 × 0.105λ0 × 0.05λ0 and it is simple to construct. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1225–1227, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21574
A multilevel gain all‐optical gain‐controlled EDFA with suppressed relaxation oscillations
Authors: de Oliveira Júlio C. R. F , Rosolem João B. , Bordonall Aldário C. 
Published: April 2006

AbstractThe characterization of an all‐optical gain‐controlled erbium‐doped fiber amplifier using an embedded variable optical attenuator in the feedback loop is presented. The gain is controlled by the attenuation level with high equalization. The amplifier presents low noise figure and strongly suppressed relaxation oscillations during channel add and drop. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1222–1225, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21575
Design and performance evaluation of a 156‐Mb/s point‐to‐multipoint millimeter‐wave fiber‐radio access link
Authors: Choi Sung Tae , Yang Ki Seok , Nishi Seiji , Shimizu Satoru , Tokuda Kiyohito , Kim Yong Hoon 
Published: April 2006

AbstractA 60‐GHz point‐to‐multipoint (P‐MP) fiber‐radio access link with data rate of 156 Mb/s is presented. For a compact system configuration, a small‐size 60‐GHz transceiver module with planar antennas is developed. A point‐to‐point (P‐P) full‐duplex fiber‐optic configuration is extended to the scheme with multiple access points (APs) by using a tree coupler and a dense wavelength‐division multiplexing (DWDM) multiplexer (MUX). The bit error rate (BER) performances of the 60‐GHz fiber‐radio access link are measured and compared. Furthermore, the effect of the extension to the scheme with multiple APs is evaluated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1219–1222, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21576
GTD model‐based target identification for ultra‐wideband radar using matching pursuits and a likelihood‐ratio test in the frequency domain
Authors: Wang Dang‐Wei , Ma Xin‐Yi , Su Yi 
Published: April 2006

AbstractThe E‐pulse technique has been applied in the past to the early‐time component of an ultra‐wideband radar response. Though its availability has been validated by several scale‐model targets, as pointed out by Poter's research results, the Prony model used in the E‐pulse technique is mismatched with the true target‐scattering behavior. In this paper, according to Poter's GTD model, the type and location parameters of scattering centers are used as templates to identify targets. With parameter templates, a GTD model‐based approach to target identification for ultra‐wideband radar using matching pursuits and likelihood‐ratio test (for short MPLRT‐GTD) is developed. The simulation results using measured scattering signatures of two targets in an ultra‐wideband chamber are provided to contrast the performance of the MPLRT‐GTD to the LRT and Li's E‐pulse technique. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1215–1218, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21577
An experimental investigation of buried‐object imaging in a homogeneous medium using synthetic‐aperture radar concepts
Authors: Ozdemir Caner , Ling Hao 
Published: April 2006

AbstractAn experimental investigation is conducted to image buried objects. A Fourier‐based imaging algorithm based on synthetic‐aperture radar (SAR) concepts is applied to the scattered data from buried dielectric targets in a homogeneous medium. An experimental setup is constructed to apply the algorithm. Three‐dimensional images of water bottles and plastic targets buried in sand are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1209–1214, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21578
Novel microstrip backward coupler with metamaterial cells for fully planar fabrication techniques
Authors: Jarauta E. , Laso M. A. G. , Lopetegi T. , Falcone F. , Beruete M. , Baena J. D. , Marcotegui A. , Bonache J. , García J. , Marqués R. , Martín F. 
Published: April 2006

AbstractBy using a recently proposed approach to synthesize 1D metamaterials in planar circuit technology, compatible with fully planar fabrication techniques, a novel backward coupler has been designed and fabricated. It has been implemented in microstrip technology by means of complementary split‐ring resonators (CSRRs), etched in the ground plane, and series capacitive gaps. This way, we obtain the necessary left‐handed properties for reversing the forward coupling (typical of co‐directional coupled‐line couplers) into backward coupling. The simulation as well as measurement results confirm the enhanced properties of the proposed couplers. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1205–1209, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21579
New wide‐aperture‐dimension formula obtained by using a particle swarm optimization for optimum gain pyramidal horns
Authors: Akdagli Ali , Guney Kerim 
Published: April 2006

AbstractA new formula for the wide aperture dimension of a pyramidal horn is presented. It is obtained by using a particle‐swarm optimization (PSO) algorithm, and is used in successfully designing optimum‐gain pyramidal horns. The computed gains of the designed pyramidal horns are in very good agreement with the desired gains. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1201–1205, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21580
Frequency variable dual bands microstrip antenna design
Authors: Prakash Thakur Jay , Park Jun‐Seok 
Published: April 2006

AbstractA new approach is proposed to design a frequency‐variable dual‐band microstrip antenna. Two unbalanced microstrip lines are used to feed microstrip patch vertically with a branch‐line coupler. The entire structure is designed on a single‐layer substrate. The resonant frequencies of the microstrip patch can be changed by varying the dimensions of the unbalance feed lines. A prototype of the proposed antenna is fabricated and measured. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 11991–1201, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21581
Radio over fibre systems using perfluorinated graded index polymer optical fibre
Authors: Lethien Christophe , Goffin André , Vilcot Jean‐Pierre , Loyez Christophe 
Published: April 2006

AbstractThe paper compares, in terms of the error vector magnitude (EVM), the transmission of two radiocellular standards (GSM and UMTS) on two different kinds of multimode fibre (glass optical fibre and polymer optical fibre). It has been so established that the perfluorinated graded index polymer optical fibre is able to carry on wireless signals through 300‐m length using standard COTS components specifically designed for glass fibre. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1197–1199, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21582
New method to design a low‐phase‐noise millimeter‐wave PLL frequency synthesizer
Authors: Ma Haihong , Tang Xiaohong , Wu Tao , Cao Zhou 
Published: April 2006

AbstractBased on the theory of phase‐noise analysis and estimation, a new method to obtain low‐phase‐noise millimeter‐wave phase‐locked loop (PLL) frequency synthesizer is presented. In order to verify its feasibility, a W‐band PLL frequency synthesizer working at 95 GHz is designed. A low phase noise of −90.44 dBc/Hz at 10‐kHz offset is achieved, which is well coincident with the estimated value. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1194–1197, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21583
Design of a multiband VCO using a cascode FET mixer
Authors: Kim Jeongpyo , Yoo Hwasu , Choi Jaehoon 
Published: April 2006

AbstractThis paper presents the voltage‐controlled oscillator (VCO) with a cascade FET structure and self‐oscillatory property. The self‐oscillation (SO) frequency of the designed VCO is 1.45 GHz and the frequency is tuned from 1.06 to 1.42 GHz by using an added varactor diode. Mixing SO signals with the external signal of 500 MHz having a 0‐dBm power level, the VCO can generate various LO signals from 560 to 1920 MHz. The tuning range of the VCO is expanded from 29% to 109.7%. The implemented VCO operates at 3 V with 30‐mA current consumption. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1005–1007, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21584
Effect of shape of patterns on the performance of microstrip photonic band‐gap filters
Authors: Karbassian M. M. , Ghafouri‐Shiraz H. 
Published: April 2006

AbstractIn this paper, two different uniform photonic band‐gap (PBG) structures used as stopband filters for microstrip lines at 5.4 GHz are proposed and compared in terms of the pattern shapes' effect on the S‐parameters. This suggests the use of a 1D pattern to reduce the transversal size of the filters. The devices consist of 50Ω microstrip transmission line and periodical patterns including circles and squares etched on the ground plane of microstrip line. No drilling through the substrate is needed. The filters exhibit well‐defined stopband and are simulated by 3D full‐wave electromagnetic analysis using HFSS™. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1007–1011, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21585
A tunable photonic RF notch filter based on opto‐VLSI technology
Authors: Zheng Rong , Alameh Kamal E. , Wang Zhenglin 
Published: April 2006

AbstractIn this paper, we propose a novel tunable transversal photonic RF notch filter based on opto‐VLSI technology. By using an array of fiber Bragg gratings (FBGs) in conjunction with an opto‐VLSI processor, the broadband light source can be spectrally sliced and attenuated, hence realizing a two‐tap RF notch filter with stepwise true‐time delays and variable weights. In addition, the free spectral frequency and notch depth of the RF notch filter can be tuned by driving the opto‐VLSI processor with optimized phase‐only holograms. We experimentally demonstrate the proposed tunable RF notch filter structure and the results show that a notch depth greater than 40 dB can be attained. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1011–1015, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21586
Digitally controlled programmable high‐speed variable optical attenuator
Authors: Li Sailu , Jin Xiaofeng , Zhang Xianmin , Zou Yingyin Kevin 
Published: April 2006

AbstractA digital closed‐loop controlled variable optical attenuator (VOA) module using an FPGA (Field Programmable Gate Array) chip for optical‐power‐fluctuation suppression is demonstrated in this paper. A VOA based on transparent electro‐optical ceramic, OptoCeramic® PLZT, is used to provide high‐speed optical power control. With logarithm amplifiers and A‐D‐A feedback circuitry, this VOA module could be designed to operate as either an attenuator or a power controller. The module can be used to filter out the optical power fluctuation up to 300 kHz. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1019–1021, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21588
Frequency‐selective surface composed of aperture‐coupled high‐impedance surfaces
Authors: Davies R. W. , Morrow I. L. , Cooper J. F. , Youngs I. 
Published: April 2006

AbstractA compact new FSS structure which provides a narrow band‐pass response is reported. The structure is composed of two high‐impedance surfaces of tightly coupled dipole‐strip conductor arrays placed back‐to‐back with a common ground plane. Each element on one surface is coupled to its neighbour on the opposite surface, via a slot aperture etched in the ground plane. A design procedure is described for optimisation of the dipole and coupling‐slots dimensions in order to excite and mode match the appropriate transmission frequency. The computed results demonstrate the coupling mechanism and transmission performance. Free‐space measurements of the FSS confirm the narrowband transmission characteristics which are potentially useful for antenna and radome‐type applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1022–1025, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21589
Gain‐flattened distributed Raman amplifier with 38‐nm bandwidth using dual‐pump wavelength
Authors: Mahdi Mohd Adzir , Sheih Shou‐Jong 
Published: April 2006

AbstractIn this paper, a 38‐nm wideband gain‐flattened distributed Raman amplifier utilising two pump wavelengths is experimentally demonstrated. The pump combination of 1430 and 1456 nm with 26‐nm spacing has enabled a gain flatness of less than 1.1 dB at a Raman on‐off gain of 10 dB. The flat gain is obtained through a careful pump‐power adjustment between these two pump wavelengths without any gain‐flattening filters. The 38‐nm bandwidth covers signal wavelengths from 1530.33 to 1568.78 nm. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1025–1028, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21590
ADI‐WEPML: Unconditionally stable PML algorithm for truncating WE‐FDTD domains
Authors: Ramadan Omar 
Published: April 2006

AbstractEfficient and unconditionally stable perfectly matched layer (PML) formulations are presented for truncating the scalar wave‐equation finite‐difference time‐domain (WE‐FDTD) grids. The proposed formulations are based on incorporating the alternating‐direction‐implicit FDTD (ADI‐FDTD) scheme into the scalar wave‐equation derived in the PML region at the domain boundaries. A numerical example carried out in the 2D domain is included and it is observed that the time step of the proposed formulations is not bounded by the CFL stability limit of the conventional WE‐FDTD algorithm, but by the required accuracy level. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1029–1032, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21591
CPW‐fed triangular antenna with a frequency‐band notch function for ultra‐wideband application
Authors: Liu Wen‐Chung , Kao Ping‐Chi 
Published: April 2006

AbstractA novel ultra‐wideband (UWB) design of a single‐layer coplanar waveguide (CPW)‐fed planar monopole antenna with a frequency‐band notch function is presented. By inserting an opened rectangular loop slot to the ground‐notched triangular patch and adjusting the dimensions of the slot, the proposed antenna, which includes two notched ground planes only 24 mm in width and 31 mm in height, can reach a frequency bandwidth, defined by VSWR < 2, of 9 GHz (from 3.1 to 12.1 GHz), covering the entire UWB band (3.1–10.6 GHz), and have a frequency notch of 780 MHz (from 5.06 to 5.84 GHz) for band rejection of the IEEE 802.11a frequency band (5.15–5.825 GHz). Good monopolelike radiation patterns and antenna gains, except in the notched frequency band, have also been obtained. Details of the proposed antenna design and the measured results are presented and discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1032–1035, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21592