bluuebunny/crossref_metadata_2025_split huggingface dataset:
Novel compact bandpass filters with wide controllable fractional bandwidth
Authors: Mandal M. K. , Mondal P. , Sanyal S. , Chakrabarty A. 
Published: November 2006

AbstractIn this letter, a novel compact structure is proposed for bandpass filter (BPF) design. The structure is realized using only one resonator. The resonator is excited by two open microstrip stubs. Further, ground plane aperture technique is used to obtain wide bandwidth. 3‐dB fractional bandwidth can be varied between 1.0 and 90.0% with good in band as well as out of band filter characteristics. The filter has the advantages of compactness, wide bandwidth, low insertion loss (IL), and ease of fabrication. A prototype fabricated filter of FBW 45.1% and passband center frequency f0 = 3.795 GHz shows a maximum passband IL of 2.0 dB. The basic BPF occupying area is less than 0.22 λg × 0.23 λg, where λg is the guided wavelength at f0. A simple stub modification extends its upper stopband at least three times the upper cutoff frequency. Good agreement between measurements and simulations are obtained. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 29–31, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22039
New balanced UWB planar antenna
Authors: Guo Y. X. , Ruan Y. F. , Zhang Z. Y. , Ong L. C. , Shi X. Q. 
Published: November 2006

AbstractA new balanced planar ultra‐wideband (UWB) antenna is proposed. First, a novel uniplanar broadband balun transition is presented. Then, a balanced UWB planar dipole antenna fed by the proposed balun is studied, and has a measured bandwidth from 2.8 to 11.2 GHz for the return loss better than −10 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 114–118, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22040
A novel concept for reconfigurable frequency selective surfaces based on silicon switches
Authors: Liang Xiaotao , Werner Douglas H. , Weiner Brian 
Published: November 2006

AbstractThe authors describe a novel concept for reconfigurable frequency selective surfaces based on metallic dipole and cross‐dipole elements connected by switches on an exposed silicon substrate. As the conductivity of silicon can be varied over a large dynamic range by photonic excitation, it represents a good candidate substrate material for producing effective switches. The genetic algorithm was used to obtain optimal performance of the switch with respect to variations of the geometric and electrical parameters of the design for desired excitation frequencies. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 109–114, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22041
Novel distributed planar negative refractive index material
Authors: Karmakar N. C. , Balbin I. 
Published: November 2006

AbstractA novel distributed microstrip negative refractive index material (NRI) is presented, which comprises of microstrip line sections loaded with interdigital capacitance and short‐circuited stub inductance. This new NRI removes the discrete lumped components and associated fabrication problems of conventional NRI. Simulation and experimental results show that the novel distributed NRI yields larger passbands and more distinct stopbands. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 48–51, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22044
The robust design for gapless microlens array fabrication using the incomplete developing and thermal reflow process
Authors: Hung Shih‐Yu , Chen Shih‐Nung , Lin Che‐Ping , Yang Hsiharng 
Published: November 2006

AbstractA systematic approach to achieving high quality gapless microlens array fabrication using the incomplete developing and thermal reflow process was developed in this study. The experimental results proved that a hexagonal microlens array with a maximum 100% fill‐factor could be successfully produced. The major objective in using this robust design is to reduce the variations in microlens array focal length, allowing improved focus and enhanced illumination brightness. In this experiment, the Taguchi method was used first to perform an efficient experimental design and analyze the robustness of the microlens array fabrication process. Several parameters affect microlens array uniformity; the hexagonal column diagonal, spin coating revolution speed, exposure time, developing time, and reflow temperature. It is very important to control these parameters to decrease the sensitivity to noise. Therefore an artificial neural network (ANN) was used to minimize the variation and make the microlens array less sensitive to process variation. The L18orthogonal array was used as the learning data for the ANN to construct an ANN model that could predict the parameters at nondiscrete levels. The results showed the microlens array quality was significantly improved compared with the original design. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 23–29, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22046
An improved design of harmonic suppression for microstrip patch antennas
Authors: Mandal M. K. , Mondal P. , Sanyal S. , Chakrabarty A. 
Published: November 2006

AbstractHarmonic suppression is an important factor for active microstrip patch antennas radiating harmonic frequencies. Here, a novel compact low pass filter (LPF) having high filter selectivity and wide stop band is used on the microstrip feed line of the patch antenna. The 15 dB LPF stopband exist over 10 GHz while implementing area is 0.1464λg × 0.1789λg at the cutoff frequency of 3.55 GHz. The fundamental antenna operating frequency falls in the passband of the LPF. The other harmonics falls in the LPF stopband and thus attenuated. An example shows up to fourth harmonic are suppressed while total occupying area remains compact. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 103–105, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22049
ASiGeHBT variable gain low noise amplifier with on‐chip active balun design
Authors: Yeh Ping‐Chun , Yang Tsung‐Yu , Liu Wei‐Cheng , Chiou Hwann‐Kaeo 
Published: November 2006

AbstractA variable gain low noise amplifier (VGLNA) using a 0.35 μm SiGe HBT process is described. A VGLNA with linear gain control and high linearity has been developed for 2.4 GHz ISM band applications. The gain control circuit is achieved without degrading either the input or the output VSWR. This technique can also simultaneously realize low noise figure and high linearity. The designed VGLNA achieved a gain of 19 dB, a noise figure of 2.7 dB, a third‐order intercept point of −12 dBm, and a linear gain control range of 7.2 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 42–45, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22052
Microstrip dual‐band bandpass filter using slow‐wave resonators for WLAN applications
Authors: Guan Xuehui , Ma Zhewang , Cai Peng , Anada Tetsuo , Hagiwara Gen 
Published: November 2006

AbstractA dual‐band bandpass filter using microstrip slow‐wave resonators is developed for wireless local area network applications. The fundamental and higher order resonant harmonics of a microstrip open‐loop resonator are analyzed against the length of the loading open stub. Then a dual‐band bandpass filters is designed in the form of slow‐wave open‐loop resonators. A zero‐degree feed structure is employed to produce transmission zeros near the passband to increase the rate of attenuations, and a quarter‐wavelength feed line for impedance matching is added to get desired external quality factor at the input and output. The theoretical analysis and design procedures are successfully verified by experimental results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 14–16, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22055
Comparison of switching properties between 10 Gb/s RZ and NRZ signal format utilizing 4 × 4 optical crosspoint switch matrix
Authors: Wang Zhuoran , Chi Nan , Yu Siyuan 
Published: November 2006

AbstractABSTRACT: We experimentally demonstrate optical packet switching with less than 8 ns switching speed for a 10 Gb/s return‐to‐zero (RZ) and non‐return‐to‐zero (NRZ) payload using a 4 × 4 optical crosspoint switch (OXS) matrix. Good waveforms and less than 0.8 dB power penalty show that RZ coding is better than NRZ. The wavelength dependence of the OXS is also investigated in terms of the receiver sensitivity and the output OSNR. Very good switching performance can be achieved from 1535 to 1561 nm. Our results suggest that the OXS can be a promising device for switching future high speed impulse coded signals. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 68–71, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22058
Compact designs of a shorted triangular patch antenna with a V slot
Authors: Sim Chow‐Yen‐Desmond , Han Tuan‐Yung 
Published: November 2006

AbstractThe compact designs of a shorted triangular patch antenna embedded with a V slot are proposed and studied. A broadband V‐slotted triangular patch antenna with one shorting wall is initially constructed as a reference. By inserting an additional shorting wall to this reference antenna, a new broadband operation can be obtained and its operating frequency is decreased by 22%, which corresponds to a reduction of 40% in the antenna area. The antenna area can be further reduced by symmetrically halving the patch size, and it is found that the impedance bandwidth of the broadband operation demonstrated no obvious variation and the operating frequency is only increased by around 8%. Details of the antenna designs and obtained results are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 34–37, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22061
A self‐similar fractal electromagnetic band‐gap structure in the power plane with broadband suppression of ground bounce noise
Authors: Zhou Peng , Zhao Junming , Feng Yijun 
Published: November 2006

AbstractIn this paper, a self‐similar fractal electromagnetic band‐gap structure with “L‐Cross ” slots is proposed and designed in the power plane to suppress the ground bounce noise in high‐speed circuits. Both the simulation and the measured results with good agreement with each other show a low onset band stop frequency of 500 MHz and a broad stop band of about 4 GHz. When combining the structure with decoupling capacitor walls at the boundary of the power plane, a broadband GBN suppression from DC to 6 GHz can be obtained. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 190–192, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22063
A parallel coupled‐line bandpass filter with wide stopband using slotted ground structures
Authors: Weng Min‐Hang , Wu Hung‐Wei , Chang Yu‐Chi , Huang Chun‐Yueh , Su Yan‐Kuin 
Published: November 2006

AbstractThis letter proposes a parallel coupled‐line bandpass filter (BPF) using the folded slotted ground structures (SGSs) to improve the wide stopband. It is shown that the designed folded SGS has a very small area in comparison of previous works. The folded SGS exhibits a dual stopband characteristic owing to the bandgap resonant characteristic of SGS to suppress the harmonic frequency of the parallel coupled‐line BPF. Good agreement with electro‐magnetic simulation and measurement is demonstrated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 159–162, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22065
Low‐phase‐noise transformer‐based top‐series QVCO using GaInP/GaAs HBT technology
Authors: Meng C. C. , Tseng S. C. , Chang Y. W. , Su J. Y. , Huang G. W. 
Published: November 2006

AbstractThe fully integrated GaInP/GaAs heterojunction bipolar transistor, transformer‐based top‐series quadrature voltage controlled oscillator (QVCO) is demonstrated at 4 GHz. The transformers on the semi‐insulating GaAs substrate possess good electrical properties at high frequencies. The QVCO at 4.1 GHz has phase noise of −120 dBc/Hz at 1 MHz offset frequency, output power of 2 dBm and the figure of merit −178 dBc/Hz. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 215–218, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22067
The mathematical group of scattering matrices: Introduction of scattering matrix multiplication
Authors: Buccafusca Osvaldo 
Published: November 2006

AbstractThis paper provides a new step towards a mathematical foundation for S‐matrices. It introduces a new operation, the S‐matrix multiplication, and defines the mathematical group of S‐matrices, allowing the power of Group Theory to be applied to S‐parameter network analysis. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 179–183, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22070
Full‐wave analysis of a new designed wide band microstrip filter using the novel method of lines
Authors: Hashish Essam A. , Saker Hossam A. 
Published: November 2006

AbstractA wide band small size microstrip filter is designed based on a full wave analysis achieved through a novel method of lines. Such a novel method enables the analysis of structures having either short or long interconnections between single discontinuities, and it reduces the discretization window through nonequidistant discretization. In the full‐wave analysis, the scattering parameters of the designed filter are computed, leading to an achievement of a bandwidth up to 23%. The designed filter is fabricated and tested, where good agreement is found between the numerical and experimental results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 150–154, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22071
Microstrip‐fed slot antennas backed by a very thin cavity
Authors: Vallecchi Andrea , Gentili Guido Biffi 
Published: November 2006

AbstractSlot antennas with a backing cavity for unidirectional radiation are investigated with the aim of achieving a thin structure capable of reasonably broadband operation. By tuning together the slot length and the cavity cross‐section, a very low‐profile cavity‐backed slot (CBS) is demonstrated. The cavity thickness of this slot antenna is about 10 times smaller than conventional one‐quarter wavelength cavities, which would allow constructing this antenna even with standard cost‐effective multilayer planar technology. The high gain and fairly wideband operation are the major advantages of the proposed configuration, which features a bandwidth of about 10% at a center frequency of 1.8 GHz with radiation efficiency in excess of 80%. Measured data are presented and compared with simulation results obtained by both the method of moments (MoM) and the finite integration technique (FIT). © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 247–250, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22073
Design and signal integrity simulation of high speed digital system
Authors: Wang Yuanqing , Hong Wei , Wang Haiming , Zhang Nianzu , Yang Guangqi , Liu Leilei , Zhang Hui , Chang Jin 
Published: November 2006

AbstractIn this article, the design and implementation of a high‐speed digital system including two daughter boards and a backplane are described, where the emphasis is focused on the systematic analysis of the signal integrity performance using full wave electromagnetic methods combined with circuit simulation. Shielded differential vias is presented for high‐speed digital design. The proposed digital system achieves a data rate exceeding 3 Gbps (bit per second)/pair. Deembed process is presented to improve the accuracy of simulation. The simulated and measured results in time domain are in agreement. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 203–210, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22076
Multiband internal antenna using two layer shorted patches for mobile handsets
Authors: Rhyu Hanphil , Jo Jae‐Hoon , Harackiewicz Frances J. , Lee Byungje 
Published: November 2006

AbstractA compact multiband internal antenna for mobile handset applications is proposed. Multiband operation is realised by two connected patches in the lower frequency band and wide band characteristics in the higher frequency band. The simulated and measured results show that the proposed antenna can effectively cover GSM, GPS, DCS, PCS, UMTS, Bluetooth/WiFi, and SDMB bands. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 176–179, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22077
Single field‐based equivalent circuit for stripline discontinuities and its applications
Authors: Lu Cheng , Tang Wanchun , Zhou Puke 
Published: November 2006

AbstractA single field‐based equivalent circuit model for different stripline discontinuities has been constructed and applied to commonly encountered stripline discontinuities, such as: open‐circuit, step, right‐angle bend, and T‐junction. Also, a low‐pass filter and a branch line coupler are analyzed by using this field‐based equivalent circuit. Compared with numerical results, the average errors of S parameters are less than 2%. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 234–237, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22082
Characteristic of narrow‐slot antennas on periodic ground planes
Authors: Lin Shun‐Yun 
Published: November 2006

AbstractThis article presents the experimental results of two narrow slot antennas, a line‐slot antenna, and a square‐slot antenna with microstrip feeding, for wide‐band operation. By selecting certain elements resembled in the slot shape, we implemented two designs with a ground plane of periodical surface, and obtained significant enhancements in the antenna bandwidth for both designs. The impedance bandwidth enhancement was as many as seven times and four times of conventional line‐ and square narrow slot antennas, respectively. Details of the experimental results are presented and discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 138–141, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22087
Safety assessment of breast cancer detection via ultrawideband microwave radar operating in pulsed‐radiation mode
Authors: Zastrow Earl , Davis Shakti K. , Hagness Susan C. 
Published: November 2006

AbstractWe conduct an finite‐difference time‐domain computational electromagnetic analysis of the safety of ultrawideband microwave breast cancer detection techniques. Pulses are transmitted into anatomically realistic MRI‐derived numerical breast phantoms with different levels of tissue heterogeneity as well as foreign entities such as implants and surgical clips, and the specific absorption is computed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 221–225, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22089
Experimental investigation of the influence of filters on regeneration performance in self‐phase modulation based regenerator
Authors: Yang Yanfu , Lou Caiyun 
Published: November 2006

AbstractIn this paper the influence of optical filters on regeneration performance in self‐phase modulation (SPM) based regenerator is investigated experimentally. The center wavelength offset of the spectral slicing filter is optimized for achieving best performance. The Amplified‐ Spontaneous‐Emission (ASE)‐removing filter is critical for creating clear off‐center spectral region and making signal regeneration feasible. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 192–195, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22093
Hexagonal dielectric resonator antenna for 2.4 GHz WLAN applications
Authors: Hamsakutty V. , Kumar A. V. Praveen , Yohannan Jaimon , Mathew K. T. 
Published: November 2006

AbstractA dielectric resonator antenna (DRA) with hexagonal geometry for WLAN applications is proposed. The antenna is excited with a simple 50 Ω microstrip transmission line. The proposed antenna produces an impedance bandwidth of 105 MHz from 2.395 to 2.50 GHz, which covers the 2.4 GHz wireless local area networks band (WLAN: 2.4–2.485 GHz). The radiation patterns are measured and are found to be omnidirectional. An average gain of 5.4 dBi is measured in the operating band. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 162–164, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22095
Posterior root–muscle reflexes elicited by transcutaneous stimulation of the human lumbosacral cord
Authors: Minassian Karen , Persy Ilse , Rattay Frank , Dimitrijevic Milan R. , Hofer Christian , Kern Helmut 
Published: November 2006

AbstractContinuous epidural stimulation of lumbar posterior root afferents can modify the activity of lumbar cord networks and motoneurons, resulting in suppression of spasticity or elicitation of locomotor‐like movements in spinal cord–injured people. The aim of the present study was to demonstrate that posterior root afferents can also be depolarized by transcutaneous stimulation with moderate stimulus intensities. In healthy subjects, single stimuli applied through surface electrodes placed over the T11–T12 vertebrae with a mean intensity of 28.6 V elicited simultaneous, bilateral monosynaptic reflexes in quadriceps, hamstrings, tibialis anterior, and triceps surae by depolarization of lumbosacral posterior root fibers. The nature of these posterior root–muscle reflexes was demonstrated by the duration of the refractory period, and by modifying the responses with vibration and active and passive movements. Stimulation over the L4–L5 vertebrae selectively depolarized posterior root fibers or additionally activated anterior root fibers within the cauda equina depending on stimulus intensity. Transcutaneous posterior root stimulation with single pulses allows neurophysiological studies of state‐ and task‐dependent modulations of monosynaptic reflexes at multiple segmental levels. Continuous transcutaneous posterior root stimulation represents a novel, non‐invasive, neuromodulative approach for individuals with different neurological disorders. Muscle Nerve, 2006
Simple and accurate four‐node axisymmetric element
Authors: Fredriksson Magnus , Ottosen Niels Saabye 
Published: November 2006

AbstractBased on the assumed strain method, a simple four‐node axisymmetric solid element is introduced. The assumed strain field is carefully selected to preserve the correct rank of the element stiffness matrix and to achieve high accuracy. The strain field is developed in conjunction with orthogonal projections and no matrix inversions are needed. The coarse mesh accuracy in bending and in typical axisymmetric load cases is excellent even for nearly incompressible materials. The strain‐driven format obtained is well suited for materials with non‐linear stress–strain relations. Several numerical examples are presented where the excellent performance of the proposed simple element is verified. Copyright © 2006 John Wiley & Sons, Ltd.