bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and analysis of on‐package dual‐mode band pass filters for highly integrated wireless transceivers
Authors: Tong Ming‐Sze , Chen Yinchao , Cao Qunsheng , Yang Mingwu , Sauleau Ronan 
Published: February 2006

AbstractIn this paper, various planar printed microwave bandpass filters (BPFs) are designed and analyzed by applying a nonuniform finite‐difference time‐domain (NU‐FDTD) method. These filters, referred to as integrated‐circuit package filters (ICPFs), are designed in such a way that they operate in dual mode (DM), that is, at TM and TM, to ensure a good electric performance at the center frequency. They operate at 2.4 and 5.25 GHz, which are the frequencies allocated to wireless local area networks (WLANs). The frequency characteristics in terms of the scattering parameters are taken for analysis, and the results are compared to the measurements as well as the computed results using High‐Frequency Structure Simulator (HFSS) software. The results show excellent agreement between the numerical and experimental data, and the proposed DM‐ICPF structures can be applied to on‐package highly integrated wireless transceiver systems. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 756–760, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21466
Nonsingular boundary integral equation for two‐dimensional electromagnetic scattering problems
Authors: Young D. L. , Chiu C. L. , Fan C. M. 
Published: February 2006

AbstractThis paper is concerned with the application of the nonsingular boundary integral equation (NSBIE) for 2D electromagnetic scattering problems in the frequency domain. In the proposed NSBIE, the conventional treatment of the singular integral for the boundary integral equation is circumvented by employing the Gauss flux theorem and the concept of equipotential. Then the NSBIE for the Helmholtz equation is used to predict the scattering of plane wave by a perfectly electric conducting circular cylinder of infinite length at normal incidence. Based on the good results, as compared with solutions of the analytical and boundary‐element methods, it is verified that the NSBIE is a highly simple and efficient numerical scheme for 2D electromagnetic scattering simulations. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 760–765, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21467
Very compact ortho‐mode transducers with double septum configuration
Authors: Ruiz‐Cruz Jorge A. , Montejo‐Garai José R. , Rebollar Jesús M. , Montesano Carlos E. , Martín María J. 
Published: February 2006

AbstractThis paper describes the analysis and design results of a very compact ortho‐mode transducer (OMT) for dual‐polarization communication systems. The presented configuration introduces an additional double septum in the conventional structure, not reported previously, which provides a number of advantages for some of the usual requirements of this type of OMTs. Specifically, the double‐septum configuration enhances the performance of the OMT in two interrelated aspects: (i) it contributes to reduce the size of the axial branch of the OMT preventing the power transfer between horizontal modes at the axial and common ports; (ii) it facilitates the matching of the horizontal polarization between the lateral and common ports. The presented design leads to a very interesting structure for coping with competitive specifications. The proposed structure is validated using a prototype onboard the Hispasat 1D satellite. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 765–767, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21468
A broadband internal planar monopole antenna for mobile phone
Authors: Shen Chao‐An , Lin Ken‐Huang 
Published: February 2006

AbstractIn this paper, we design and fabricate a broadband interior‐type planar monopole with an omnidirectional radiation pattern over a wide operation band using a slanted feeding shape. It has a measured 10‐dB impedance bandwidth of about 670 MHz (1585–2255 MHz) covering the DCS (digital cordless system, 1710–1880 MHz), PCS (personal communication system, 1850–1990 MHz), and UMTS (universal mobile telecommunication system, 1920–2170 MHz) bands. The slanted feeding shape can obtain the compensation of the input reactance and reduce the antenna height. This planar monopole antenna has a height of only 15 mm and can provide more space for the system ground plane in mobile handsets. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 768–769, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21469
A novel V‐band 90° hybrid using surface micromachining technology
Authors: Chun Young‐Hoon , Moon Ju‐Young , Ko Baek‐Seok , Baek Tae‐Jong , Kim Sung‐Chan , Lim Byoung‐Ok , Rhee Jin‐Koo , Shin Dong‐Hoon 
Published: February 2006

AbstractA novel 90° hybrid at the V‐band using surface micromachining technology is designed and measured. It employs a uniplanar structure which is composed of parallel coupled microstrip lines and delay lines. Compared with the conventional hybrids, cascaded parallel coupled lines with delay lines can make the coupling tighter as the number of coupled lines grows. The measured insertion loss is less than 2 dB and the phase imbalance is less than ±5° at 60 GHz. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 770–771, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21470
Comparison of possible implementations of nonmechanical optical beam steering using phased arrays of vertical cavity lasers and amplifiers
Authors: Xing Cheng , Mankondo O.L.M. , Avrutin E.A. 
Published: February 2006

AbstractWe theoretically study the far‐field pattern of vertical‐cavity semiconductor laser (VCSEL) arrays and vertical cavity amplifier/modulator arrays. A comparison is made between the laser and amplifier array for the purpose of nonmechanical optical beam steering. The amplifier/modulator array shows superior potential over the laser arrays. The realisation of practical devices depends on the fabrication technology. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 772–775, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21471
A modified HICUM model for GaInP/GaAs HBT devices
Authors: Tseng S.‐C. , Meng C. C. , Chen W.‐Y. , Su J.‐Y. 
Published: February 2006

AbstractA compact physics‐based transit‐time model is established for the GaInP/GaAs HBT device. The VBIC model fails to describe the transit‐time frequency versus bias (IC, VCE), especially at low‐ and medium‐current regimes. Starting with the HICUM model, we introduce a new time constant to describe the transit‐time frequency versus bias (IC, VCE) more precisely. This model has obvious advantages over the VBIC model for showing the relation of ft versus bias (IC, VCE) in the low and medium current regimes for GaInP/GaAs HBT devices. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 780–783, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21474
Nonoverlapping domain decomposition method for the capacitance extraction of multilayered multiconductor transmission lines
Authors: Zhu Hanqing , Liu Shujing , Hong Wei 
Published: February 2006

AbstractIn this paper, the nonoverlapping domain decomposition methd (NDDM) is used to compute the capacitance matrix of multiconductor transmission lines in multilayer dielectric media. The subdomains with pure dielectric layers are analyzed using the method of lines (MoL), and fast Fourier transform (FFT) is introduced to reduce the computing time, while the subdomains with conductors are analyzed using the finite‐difference method. The numerical results show that the algorithm is efficient, and the computing time and memory needs are unrelated to the thickness of the pure dielectric layers. In addition, the effect of the uneven dielectric division on the electromagnetic parameter is also investigated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 794–798, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21478
Controlling the scattered field in a reflectarray element using a novel technique
Authors: Cabria L. , Garcia J. A. , Mediavilla A. 
Published: February 2006

AbstractIn this paper, a novel gain/phase adjustment unit to be employed as the cell of an active reflectarray is proposed. Based on accurate control of PHEMT behaviour in normal and inverse operation, a dual‐device variable‐gain biphase amplifier (VGBPA) has been designed for each branch of such an IQ modulator. Its proper integration in a dual‐feed aperture‐coupled square patch allows the use of orthogonal polarizations for retransmitting the received signal after selecting the desired amplitude and phase for the scattered field. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 808–810, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21481
A compact‐sized microstrip antenna for GPS applications
Authors: Chou Hsi‐Tseng , Chiu Yi‐Ling 
Published: February 2006

AbstractA microstrip antenna structure is proposed for global positioning system (GPS) applications. This structure is intended to reduce the antenna size at low cost in order to fulfill the increasing needs of mobile devices with GPS functions. Thus, dielectric slabs with low relative permittivity, which can be commonly available on the market at a low cost, are employed. The size reduction is achieved by cutting slits and L‐slots on the surface of the microstrip metal patch in order to lower the resonance frequency of the structure. The numerical and experimental results verify that the antenna design can improve the wide‐angle axial ratio in addition to size the reduction with insignificant reduction of the operation‐frequency bandwidth (still fully sufficient to cover the GPS frequency band). © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 810–814, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21482
A novel multiband and broadband fractal patch antenna
Authors: Huang Jingjing , Shan Fuqi , She Jingzhao , Feng Zhenghe 
Published: February 2006

AbstractA novel multiband and broadband fractal patch antenna is presented in this paper. The proposed antenna is compact and simple to design and fabricate. The impedance bandwidth can reach 18%, which is rarely reported for single‐layer and single‐patch antennas. Multiband characteristics are also observed and analyzed. All the results are proved by simulation and experiment. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 814–817, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21483
Multiband multiport direct conversion receiver: Design, implementation, and demodulation results
Authors: Tatu Serioja O. , Wu Ke , Denidni Tayeb A. 
Published: February 2006

AbstractAn experimental receiver prototype operating over the S‐, C‐, and X‐bands, based on a MHMIC multiport, is designed, fabricated, and measured. Comparative simulation and measurement results for 8PSK modulated signals are presented and discussed. The RF input power sweep and the DC offset of the proposed multiport demodulator are particularly analyzed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 817–822, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21484
Implementation of a trapezoidal‐rule microwave integrator
Authors: Hsue Ching‐Wen , Tsai Lin‐Chuan , Kan Shih‐Tsung 
Published: February 2006

AbstractThe bilinear transformation is employed to represent the trapezoidal‐rule integrator in the Z domain. This formulation, in conjunction with the representations of transmission‐line elements in the Z domain, leads to the transmission‐line configuration that is eligible for a microwave integrator. A microstrip circuit is implemented to verify the feasibility of the technique. Except for the lower‐frequency band, the experimental results are in good agreement with the theoretical values of the trapezoidal‐rule integrator. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 822–825, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21485
Capacitance of axially slotted coaxial cable
Authors: Kim Dong H. , Eom Hyo J. 
Published: February 2006

AbstractThe electrostatic potential problem of an axially slotted coaxial cable is solved. A mode‐matching technique is used to obtain a set of simultaneous equations for the modal coefficients. The behavior of electrostatic potential distribution and capacitance is presented in terms of slotted coaxial cable geometries. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 825–827, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21486
Acute inflammatory demyelinating polyneuropathy: Contribution of a dispersed distal compound muscle action potential to electrodiagnosis
Authors: Cleland James C. , Malik Khizar , Thaisetthawatkul Pariwat , Herrmann David N. , Logigian Eric L. 
Published: March 2006

AbstractProlonged duration of the distal compound muscle action potential (DCMAP) (“DCMAP dispersion”) is useful in the electrodiagnosis of chronic inflammatory demyelinating polyneuropathy (CIDP) with good specificity in distinguishing CIDP from amyotrophic lateral sclerosis (ALS) and diabetic polyneuropathy, but its role in the electrodiagnosis of acute inflammatory demyelinating polyneuropathy (AIDP) is unclear. This study addresses this issue by determining the optimal cutoff for DCMAP duration using receiver operating characteristic (ROC) analysis in 207 motor nerves from 53 clinically defined AIDP patients compared to 148 motor nerves from 55 ALS patients. We also determined whether the presence of DCMAP dispersion improves the sensitivity of four of the most sensitive published sets of electrodiagnostic criteria for AIDP. Using the ROC‐derived optimal DCMAP duration cutoff of 8.5 ms, DCMAP dispersion was found in at least one motor nerve in 66% of subjects with AIDP compared to 9% of subjects with ALS. DCMAP dispersion improved the sensitivity of the four tested criteria sets to 76%–87% from 43%–77%. Moreover, of 13 AIDP patients who met none of the four published criteria sets, 5 (38%) had at least one dispersed DCMAP. These findings indicate that the presence of DCMAP dispersion adds electrodiagnostic sensitivity to the currently published criteria sets, while maintaining reasonably high specificity against a prototypical disorder of the primary motor neuron with axon loss. Muscle Nerve, 2006
Spectrum policy issues for state and local government
Authors: Jesuale Nancy 
Published: March 2006

AbstractThis paper describes challenges in the United States faced by local and state governments in providing advanced technical infrastructure for efficient delivery of public services, under current and proposed federal spectrum and telecommunications policy. The potential impact of new wireless communications technologies, particularly cognitive radio and broadband convergence, is discussed. Within this context, the U.S. spectrum policy issues important to state and local governments are highlighted. Copyright © 2006 John Wiley & Sons, Ltd.
Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes
Authors: Leu Alexe E. , McHenry Mark , Mark Brian L. 
Published: March 2006

AbstractSpectrum measurement studies have shown that substantial portions of the allocated wireless spectrum are highly underutilized. Frequency‐agile radios (FARs) have the potential to make opportunistic use of such spectrum holes without causing harmful interference to users of the allocated spectrum. Toward this goal, we develop a framework for modeling the interference caused by FARs employing spectrum access mechanisms based on the simple Listen‐Before‐Talk (LBT) scheme. Two variations of LBT are considered: individual LBT, whereby the FARs act independently of each other; and collaborative LBT, whereby the FARs communicate with each other in order to more accurately identify the spectrum holes. Our analysis of the LBT scheme reveals the fundamental interdependencies among key system design metrics and provides a basis for analyzing more complex spectrum access methods. In particular, the analysis of LBT provides a lower bound on the capacity gain achievable by FARs employing spectrum‐sharing schemes. Our numerical results show that the individual LBT scheme can provide substantial capacity gains, while even more gain can be achieved using the collaborative LBT schemes. Our analysis suggests that much greater gains should be achievable via spectrum access schemes that incorporate location information and/or more sophisticated group behaviors. Copyright © 2006 John Wiley & Sons, Ltd.
A bidirected generalization of network matrices
Authors: Appa Gautam , Kotnyek Balázs 
Published: February 2006

AbstractWe define binet matrices, which furnish a direct generalization of totally unimodular network matrices and arise from the node‐edge incidence matrices of bidirected graphs in the same way as network matrices do from directed graphs. We develop the necessary theory, give binet representations for interesting sets of matrices, characterize totally unimodular binet matrices and discuss the recognition problem. We also prove that binet constraint matrices guarantee half‐integral optimal solutions to linear programs. © 2006 Wiley Periodicals, Inc. NETWORKS, Vol. 47(4), 185–198 2006
Prenatal diagnosis and molecular cytogenetic characterisation of a small de novo interstitial duplication 16q11.2‐q13
Authors: Trimborn Marc , Wegner Rolf‐Dieter , Tönnies Holger , Sarioglu Nanette , Albig Matthias , Neitzel Heidemarie 
Published: February 2006

AbstractWe describe the first prenatally detected case of a small de novo interstitial duplication of chromosome 16q. This chromosomal aberration is extremely rare. Amniocentesis was indicated by advanced maternal age only. Ultrasound examinations of the foetus showed no abnormalities. Conventional and molecular cytogenetic analyses on cultured amniocytes by comparative genomic hybridisation (CGH) and fluorescence in situ hybridisation (FISH) using partial chromosome paints and a locus‐specific YAC clone revealed a de novo direct duplication of the chromosomal region 16q11.2‐q13 leading to a partial trisomy 16q (46,XX,dup(16)(q11.2q13)). There are only five postnatal reports of comparable duplications involving this chromosomal region. These patients presented with little or no associated dysmorphic features but with significant neurodevelopmental delay and severe behavioural problems. After genetic counselling, the parents opted for termination of pregnancy. Post‐mortem examination showed slight facial dysmorphic signs, minor dysgenesis of the ovaries and an atypical outflow of the arteria thyroidea ima. Copyright © 2006 John Wiley & Sons, Ltd.
Prenatal findings and molecular cytogenetic analyses of partial trisomy 12q (12q24.32→qter) and partial monosomy 21q (21q22.2→qter)
Authors: Chen Chih‐Ping , Chern Schu‐Rern , Lin Chyi‐Chyang , Wang Tzu‐Hao , Li Yueh‐Chun , Hsieh Lie‐Jiau , Lee Chen‐Chi , Hua Hui‐Min , Wang Wayseen 
Published: February 2006

AbstractObjectivesTo present the prenatal findings and molecular cytogenetic analyses of partial trisomy 12q and partial monosomy 21q, and a review of the literature.MethodsAmniocentesis was performed at 23 gestational weeks in a 33‐year‐old woman because of abnormal sonographic findings. Amniocentesis revealed a derivative chromosome 21, or der(21), with a deletion on the region of 21q22.2 and an addendum of a small chromosomal segment of unknown origin. The maternal karyotype was subsequently found to be 46,XX,t(12;21)(q24.32;q22.2). Level II ultrasound showed microcephaly, micrognathia, a ventricular septal defect, and rocker‐bottom feet. The pregnancy was terminated. A malformed infant was delivered without the phenotype of holoprosencephaly (HPE). Fluorescence in situ hybridization (FISH) and polymorphic DNA markers were used to investigate the involved chromosomal segments.ResultsFISH study showed the absence of the signal of 21q subtelomeric probe and the presence of the signal of 12q subtelomeric probe in the der(21).The fetal karyotype was 46,XY,der(21) t(12;21)(q24.32;q22.2)mat. Genetic marker analysis showed a deletion at 21q22.2 and a breakpoint between D21S156 (present) and D21S1245 (absent). The deleted segment was measured about 4.5 Mb encompassing the HPE critical region.ConclusionsMolecular genetic analyses help in determining the prenatally detected unbalanced cryptic translocation as well as parental balanced subtle translocation. A duplication of 12q24.32→qter and a deletion of 21q22.2→qter may be associated with prenatal sonographic findings of microcephaly, borderline ventriculomegaly and cerebellar hypoplasia, micrognathia, a ventricular septal defect, and rocker‐bottom feet. Haploinsufficiency of the HPE critical region at 21q22.3 may not cause an HPE phenotype. Copyright © 2006 John Wiley & Sons, Ltd.
Isodicentric Yp: prenatal diagnosis and outcome in 12 cases
Authors: Bruyère H. , Speevak M. D. , Winsor E. J. T. , de Fréminville B. , Farrell S. A. , McGowan‐Jordan J. , McGillivray B. , Chitayat D. , McFadden D. , Adouard V. , Terespolsky D. , Prieur F. , Pantzar T. , Hrynchak M. 
Published: March 2006

AbstractObjectives
To present the prenatal cytogenetic findings and postnatal outcome of 12 cases with an isodicentric chromosome composed of the short arm of the Y chromosome.
To review the literature and provide recommendations for cytogenetic analysis and counseling.
MethodsPrenatal and postnatal cytogenetic data and clinical findings of isodicentric Yp ascertained in six institutions were gathered and reviewed.ResultsNine of the twelve cases were referred for advanced maternal age (AMA), one of which was a twin pregnancy with one twin having an increased nuchal translucency measurement. The remaining cases were referred owing to a family history of hemophilia and an abnormal maternal serum screen, respectively. Nine of these pregnancies resulted in the birth of a normal‐appearing male infant with subsequent normal growth and psychomotor development. Follow‐up ranged from birth to 7 years. In two cases, the pregnancy was terminated and the fetuses showed male external genitalia. In the case ascertained because of an increased nuchal translucency measurement, the prenatal diagnosis of 45,X was made. At birth, there were ambiguous genitalia, and postnatal cytogenetic studies found an isodicentric Yp. In 11 of the 12 cases, mosaicism was present.ConclusionOur cases show that the prenatal finding of an isodicentric Yp, with or without 45,X mosaicism, is compatible with normal male phenotype in most cases, particularly in the absence of other anomalies. To ensure accuracy in cytogenetic reporting and prenatal counseling, the identification of a structurally abnormal or small Y chromosome, either alone or in the presence of 45,X colonies, should be followed immediately by confirmatory molecular cytogenetic investigations as well as by ultrasound determination of the phenotypic sex of the fetus. Copyright © 2006 John Wiley & Sons, Ltd.