bluuebunny/crossref_metadata_2025_split huggingface dataset:
Compact microstrip bandpass filter using modified stepped‐impedance hairpin resonator
Authors: Tu Wen‐Hua 
Published: May 2008

AbstractA modified compact stepped‐impedance hairpin resonator using an interdigital capacitor and its application to a bandpass filter design are presented. In comparison to the coupled line of a conventional stepped‐impedance hairpin resonator, the interdigital capacitor of the proposed resonator achieves a bigger parallel capacitance. Hence, the proposed resonator can achieve a compact size and a wider harmonic‐free bandwidth. Comparing the measured results of the two bandpass filters using the conventional resonators or the modified resonators suggests that the bandpass filter using the proposed resonators achieves a superior performance. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2007–2010, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23559
A GSM signals‐based positioning technique for mobile applications
Authors: Azaro R. , Donelli M. , Benedetti M. , Rocca P. , Massa A. 
Published: May 2008

AbstractA mobile positioning system based on GSM signals analysis and on a cooperative stochastic optimization algorithm is presented. The proposed technique is intended as a backup solution in those applicative scenarios where the GPS system fails to work (e.g.,urban canyons). The hardware architecture of the system and the positioning algorithm are described and validated by means of a numerical assessment. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2128–2130, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23568
Parametric analysis of microstrip lines loaded with complementary split ring resonators
Authors: Bonache Jordi , Gil Marta , García‐Abad Oscar , Martín Ferran 
Published: May 2008

AbstractIn this article, the effects of varying the geometry of complementary split ring resonators (CSRRs) in microstrip lines loaded with such resonant elements is analyzed. Specifically, from a parameter extraction technique previously proposed by some of the authors, the electrical parameters of CSRR‐loaded lines (namely, the line inductance, the inductance and capacitance of the CSRR, and the coupling capacitance between the line and the CSRRs), are inferred. This analysis is of interest because, in spite of the existence of analytical models that predict the electrical parameters of these CSRR‐loaded lines, the validity of these models is limited, and the parameter extraction method is necessary to accurately determine the electrical parameters from geometry. From the analysis carried out in this work, interesting conclusions for the design of CSRR‐loaded lines are obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2093–2096, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23571
Analysis of a compact and broadband microstrip patch antenna
Authors: Ansari Jamshed A. , Ram Ram Brij 
Published: May 2008

AbstractA broadband microstrip patch antenna with U‐shaped parasitic elements is proposed and analyzed using equivalent circuit theory concept. The effects of gap between the main patch and the U‐shaped parasitic elements, substrate thickness, and the feed point location are analyzed to obtain the optimum conditions for broadband operation of the antenna. The antenna shows an operational frequency band from 4.88 to 6.44 GHz with 28.36% bandwidth at center frequency 5.5 GHz. The radiation patterns of the proposed antenna are similar to that of a rectangular patch. The antenna shows 3‐dB beam width of 98.6° at lower resonance frequency whereas it is 77.6° at higher resonance frequency. The theoretical results are in good agreement with experimental results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2059–2063, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23573
The band‐notch function for a printed ultra‐wideband monopole antenna with E‐shaped slot
Authors: Cui Zhen , Jiao Yong‐Chang , Zhang Li , Zhang Fu‐Shun 
Published: May 2008

AbstractIn this study, a printed rectangular monopole antenna with a band‐notch function is proposed for ultra‐wideband (UWB) applications. The notched frequency band is achieved by embedding an E‐slot in the rectangular radiation patch. The notched frequency band can be controlled by adjusting the location, length, and the width of the slot. A design example for an UWB monopole antenna with a notched frequency band at 5 GHz is demonstrated. The antenna also shows omnidirectional radiation patterns across the whole operating bandwidth that is suitable for UWB applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2048–2052, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23582
An enhanced bandwidth design technique for Peano fractal loaded monopole antenna
Authors: Yan‐min Yu , Yi‐ming Tang , Wen Wu 
Published: May 2008

AbstractA new technique for Peano fractal loaded monopole antenna to enhance impedance bandwidth by loading shorting pins is presented. Simulated and measured data show that relative impedance bandwidths of the proposed order 1 and order 2 antennas achieve 23 and 28% for VSWR less than 2 in L‐band, which are enhanced 90 and 75% than those of conventional ones, respectively, while the profile and radiation patterns change little. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2045–2048, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23583
A dual‐band receiver front‐end using current‐mode passive mixer with digitally‐controlled oscillator in 90‐NM CMOS
Authors: Chen Jinghong , Li Shaorui , Appel Craig , Hotron Brian , Lawrence  
Published: May 2008

AbstractThis work presents a receiver front‐end that targets mobile video applications, and integrates a dual‐band LNA, a current‐mode passive mixer, a reference Gilbert mixer, and a digitally‐controlled oscillator providing the quadrature LO signal for the mixers. The conversion gain and thermal noise performances of the current‐mode passive mixer are studied. Design tradeoffs among noise, linearity, and conversion gain are performed. Measured performance of the receiver front‐end shows a flicker noise corner of 70 kHz, a noise figure (NF) of 4.4 dB, an input third‐order intermodulation product (IIP3) of −2 dBm, and DCO phase noise of −128 dBc/Hz at 1‐MHz offset. The receiver consumes less than 24 mA of current in a 1.2‐V 90‐nm standard digital CMOS process. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2138–2142, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23587
A novel broadband EBG using cascaded mushroom‐like structure
Authors: Liang L. , Liang C. H. , Chen L. , Chen X. 
Published: May 2008

AbstractA novel broadband electromagnetic band‐gap (EBG) structure is presented using cascaded mushroom‐like structure with different radius of via. Direct transmission method is used to determine the band‐gap of the EBG structure. The effects of the radius of via and unit number on the mushroom‐like EBG structure are investigated. Two kinds of unit with different via radius are cascaded to enlarge the band‐gap of EBG structure, which achieves almost 70%. The simulation and experimental results show that the band‐gap covers the stop‐band produced by the two uniform configurations with different radius, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2167–2170, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23598
Novel U‐shaped strip‐slot printed antenna for triple‐frequency operation
Authors: Chen Wen‐Shan , Chang Wen‐Yen 
Published: May 2008

AbstractThis article proposed a design of a U‐shaped strip‐slot antenna for GSM900/DCS1800/WLAN/Bluetooth applications. The proposed antenna was fabricated on FR4 substrate and fed by 50‐Ω coaxial cable. The proposed antenna was first cut into U‐shaped strip to operate at higher frequency of 2.4 GHz for WLAN/BlueTooth applications. Furthermore, the other operation bands‐900 MHz and 1800 MHz for GSM900/DCS1800 applications have been achieved by inserted symmetric U‐shaped slot into the ground plane. Simulated and measured results are shown below. Details of the proposed antenna configuration and experimental results are also discussed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2219–2223, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23601
Microwave velocity and impedance tuning of traveling‐wave modulator using ion implantation for monolithic integrated photonic systems
Authors: Seo Sang‐Woo , Yan John , Baek Jong‐Hwa , Soares Francisco M. , Broeke Ronald , Pham Anh‐Vu , Yoo S. J. Ben. 
Published: May 2008

AbstractWe present performance improvement in InP traveling‐wave modulators (TWMs) using a periodic ion implantation on coplanar waveguide. Fabricated TWMs show the successful velocity and impedance tuning with return loss of lower than −12dB and reduced effective microwave refractive index of approximately 4 across the measured frequency range up to 50GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2151–2155, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23607
A dual‐mode bandpass filter with a wide stopband using a controllable bandstop structure
Authors: Hung Cheng‐Yuan , Weng Min‐Hang , Yang Ru‐Yuan 
Published: May 2008

AbstractIn this article, a bandpass filter with a wide stopband is proposed for the wireless local area network (WLAN) system. The filter is mainly composed of a dual‐mode bandpass filter (DM‐BPF) and a controllable bandstop structure (CBS). By using the CBS, multiple transmission zeros can be located on the spurious responses of the DM‐BPF. The design procedure is discussed in detail in this article. The designed filter is fabricated and measured. Measured results have a good agreement with the simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2214–2216, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23610
On‐chip spiral inductor with novel gradually changed structure
Authors: Liu Jing , Shi Yanling , Wen Xiuzhi , Chen Dawei , Luo Tian‐Xing , Huang Hao , Ye Hongbo , Wang Yong 
Published: May 2008

AbstractOn‐chip spiral inductors with sufficient quality factors are very important in many RF circuits. Based on the magnetic field intensity of a spiral inductor increasing gradually from outside to inside, this article presents a novel inductor structure with gradually changed metal width and space. Some design rules of this new structure have been obtained from a large number of data analyses. The sum of metal width and space of each coil is fixed while the ratio of the metal width to space is gradually reduced from outside to inside. Inductors have been fabricated and the obtained experimental results have verified the proposed design method. For a 7‐nH inductor on high‐resistivity silicon at 2.1 GHz, Q factor of 10 is 23.5% higher than the conventional inductor with fixed metal width and space, and is also 13.6% higher than the single gradually changed inductor with fixed space and gradually changed metal width. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2210–2213, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23611
Single‐layer bandpass active frequency selective surface
Authors: Kiani Ghaffer I. , Ford Kenneth L. , Esselle Karu P. , Weily Andrew R. , Panagamuwa C. , Batchelor John C. 
Published: May 2008

AbstractA single‐layer, bandpass, active FSS is presented. It shows good angle of incidence stability for TE incidence, at the operating frequency of 2.45 GHz. It is based on circular loop aperture with each unit cell having four PIN diodes. A novel method for dc biasing is used. About 12 dB average variation in transmission loss, between ON and OFF states, has been experimentally achieved at 2.45 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2149–2151, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23615
Centralized lightwave radio‐over‐fiber system by only one phase modulator for DWDM optical millimeter‐wave generation
Authors: Chen Lin , Dong Ze , Lu Jia , Chun Wen Shuang 
Published: May 2008

AbstractWe have proposed and demonstrated a novel radio‐over‐fiber (ROF) architecture by using only one phase modulator and one optical filter to generate DWDM optical millimeter (mm) signals and realize wavelength reuse for upstream data connection. There is no additional laser source for the upstream data generation in the base station and no dc‐bias controller for phase modulator. By this method, we simplify the configuration of the DWDM ROF system and reduce the cost of the system. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2146–2149, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23616
Reduced splitting error in the ADI‐FDTD method using iterative method
Authors: Kong Ki‐Bok , Kim Jong‐Sung , Park Seong‐Ook 
Published: May 2008

AbstractIn this study, a new method is introduced to reduce the splitting error in the ADI‐FDTD method using iterative method. The proposed method includes two procedures. First we solve the procedure of ADI‐FDTD method and secondly a new iterative scheme is adopted. The improvement of reduced splitting error is investigated by numerical examples. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2200–2203, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23618
Efficient technique for two‐dimensional scattering center extraction and ISAR image formation
Authors: Shin Seung Yong , Myung Noh Hoon 
Published: May 2008

AbstractThis article presents efficient technique of two‐dimensional (2D) scattering center extraction and inverse synthetic aperture radar (ISAR) image formation of a target. The proposed technique uses a sparse scanning order conception and modified spatial smoothing preprocessing (MSSP). The MSSP is used to construct autocorrelation matrix. In general, 2D IFFT (inverse fast Fourier transform) is widely used to obtain 2D scattering center and ISAR image. This method is computationally efficient, but has drawbacks that are poor in terms of resolution. To overcome these shortcomings with the IFFT‐based method, various high‐resolution techniques were developed. The proposed algorithm enables us to provide exact scattering centers and ISAR image of a target. In order to show the performances of the proposed technique, we use backscattered field data of the ideal point scatterers and the F‐18 aircraft to estimate 2D scattering centers and obtain 2D ISAR image. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2173–2178, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23619
Discretely tunable single‐ and dual‐wavelength fiber ring laser using a fiber Bragg gratings based Fabry‐Perot filter
Authors: Zhou Jinlong , Xia Li , Dong Xiaopeng , Shum Ping 
Published: May 2008

AbstractA Fabry‐Perot filter is realized by inscribing two identical 1 mm uniform Bragg gratings separated by 7.7 mm space in the hydrogen‐loaded photosensitive optical fiber. It is then incorporated with a tunable chirped fiber Bragg grating into a fiber ring cavity. Fourteen single‐wavelength lasings from 1552.186 nm to 1553.453 nm with average 97.5 pm spacing, and 13 pairs of dual‐wavelength lasings within the above wavelength range are achieved stably. This kind of laser will be very useful in applications requiring close‐spacing and tunable single‐ or dual‐wavelength components and systems. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2170–2173, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23620
1H and 13C NMR spectral assignments of some novel 2,4,6,8‐tetraaryl‐3,7‐diazabicyclo[3.3.1]nonan‐9‐one derivatives
Authors: Parthiban Paramasivam , Ramachandran Rajamanickam , Aridoss Gopalakrishnan , Kabilan Senthamaraikannan 
Published: May 2008

AbstractThe 1H and 13C NMR spectra of 2,4,6,8‐tetraaryl‐3,7‐diazabicyclo[3.3.1]nonan‐9‐ones (1–2), oximes (3–8) and O‐benzyl oximes (9–12) were recorded. The chemical shifts were unambiguously assigned using 1D and 2D NMR spectral data. The results clearly indicate that the compounds exist in chair‐boat conformation with equatorial and axial orientation of the aryl groups in the chair and boat forms, respectively. Since the molecules are flexible and dynamic in solution, the chair and boat forms are mutually interconvertible. In 3–12, because of the effect of oximation/oximination, all the protons in the heterobicyclic systems gave distinct signals except the benzylic protons of the boat form. In all synthesized compounds, the aryl group protons at C‐6,8 are shielded by the aryl groups at C‐2,4 and therefore appear in the lower frequency region than the aryl groups at C‐2,4. Copyright © 2008 John Wiley & Sons, Ltd.
Identification of oocyte‐selective NLRP genes in rhesus macaque monkeys (Macaca mulatta)
Authors: McDaniel Patrick , Wu Xuemei 
Published: May 2008

AbstractOocyte‐selective genes control multiple aspects of female gamete development and preimplantation embryogenesis. Several key oocyte‐selective factors have been identified in mice recently; however, these factors are not well documented in more advanced species such as nonhuman primates. One of such oocyte‐selective factors is NLRP5 (NLR family, Pyrin domain containing 5), also known as Maternal Antigen That Embryos Require (MATER), which is required for preimplantation embryo development beyond the 2‐cell stage in mice. Human NLRP family contains 14 members. We identified 14 NLRP gene homologues and examined their spatial and temporal expression in rhesus macaque monkeys (Macaca mulatta). While all 14 NLRP genes are detectable in the macaque gonad, eight of them (NLRP2, 4, 5, 8, 9, 11, 13, and 14) are specifically or preferentially expressed in the ovary. In situ hybridization elucidated a specific oocyte expression pattern of the eight NLRP genes within the ovary. During the oocyte‐to‐embryo transition, seven of these oocyte‐selective NLRP transcripts (excluding NLPR2) are enriched in maturing oocytes and early preimplantation embryos but diminish upon embryo genome activation, indicating an exclusive maternal origin of these transcripts. Though functionally unknown, the spatial and temporal distribution of these oocyte‐selective NLRP genes implies important roles of the NLRP family in oogenesis and early embryo development in nonhuman primates. Mol. Reprod. Dev. 76: 151–159, 2009. © 2008 Wiley‐Liss, Inc.
New techniques for cartilage magnetic resonance imaging relaxation time analysis: Texture analysis of flattened cartilage and localized intra‐ and inter‐subject comparisons
Authors: Carballido‐Gamio Julio , Link Thomas M. , Majumdar Sharmila 
Published: May 2008

AbstractMR relaxation time measurements of knee cartilage have shown potential to characterize knee osteoarthritis (OA). In this work, techniques that allow localized intra‐ and inter‐subject comparisons of cartilage relaxation times, as well as cartilage flattening for texture analysis parallel and perpendicular to the natural cartilage layers, are presented. The localized comparisons are based on the registration of bone structures and the assignment of relaxation time feature vectors to each point in the bone–cartilage interface. Cartilage flattening was accomplished with Bezier splines and warping, and texture analysis was performed with second‐order texture measures using gray‐level co‐occurrence matrices (GLCM). In a cohort of five normal subjects the performance and reproducibility of the techniques were evaluated using T1ρ maps of femoral knee cartilage. The feasibility of creating a mean cartilage relaxation time map is also presented. Successful localized intra‐ and inter‐subject T1ρ comparisons were obtained with reproducibility similar to that reported in the literature for regional T2. Improvement of the reproducibility of GLCM features was obtained by flattening the T1ρ maps. The results indicate that the presented techniques have potential in longitudinal and population studies of knee OA at different stages of the disease. Magn Reson Med 59:1472–1477, 2008. © 2008 Wiley‐Liss, Inc.
Longitudinal 3He and proton imaging of magnetite biodistribution in a rat model of instilled nanoparticles
Authors: Al Faraj Achraf , Lacroix Ghislaine , Alsaid Hasan , Elgrabi Dan , Stupar Vasile , Robidel Franck , Gaillard Sophie , Canet‐Soulas Emmanuelle , Crémillieux Yannick 
Published: May 2008

AbstractEpidemiological and toxicological studies have provided evidence that accidentally inhaled nanosize ultrafine particles can induce chronic or acute health damage. MRI, being noninvasive, is able to assess the biodistribution and clearance of magnetically labeled nanoparticles induced by instillation or inhalation. We report 3He and proton MRI follow‐up of lung, liver, spleen, and kidney distribution of USPIO (ultrasmall superparamagnetic iron oxide) in a rat model. The sensitivity of the imaging technique to various concentrations of instilled magnetite suspension was first assessed in vivo (n = 12). A 2‐week longitudinal imaging study was then performed on animals (n = 7) instilled with a 0.5 mg magnetite solution. Hypointense and void signal regions associated with intrapulmonary USPIO were observed in the 3He ventilation images throughout the study, whereas no USPIO‐related proton signal intensity changes were found. Intrapulmonary magnetite nanoparticle confinement was confirmed by ex vivo iron assay and histological analysis. This study demonstrates that combined 3He and proton MRI enables noninvasive assessment of the distribution and clearance of magnetically labeled instilled nanoparticles. Magn Reson Med 59:1298–1303, 2008. © 2008 Wiley‐Liss, Inc.
A 128‐channel receive‐only cardiac coil for highly accelerated cardiac MRI at 3 Tesla
Authors: Schmitt Melanie , Potthast Andreas , Sosnovik David E. , Polimeni Jonathan R. , Wiggins Graham C. , Triantafyllou Christina , Wald Lawrence L. 
Published: May 2008

AbstractA 128‐channel receive‐only array coil is described and tested for cardiac imaging at 3T. The coil is closely contoured to the body with a “clam‐shell” geometry with 68 posterior and 60 anterior elements, each 75 mm in diameter, and arranged in a continuous overlapped array of hexagonal symmetry to minimize nearest neighbor coupling. Signal‐to‐noise ratio (SNR) and noise amplification for parallel imaging (G‐factor) were evaluated in phantom and volunteer experiments. These results were compared to those of commercially available 24‐channel and 32‐channel coils in routine use for cardiac imaging. The in vivo measurements with the 128‐channel coil resulted in SNR gains compared to the 24‐channel coil (up to 2.2‐fold in the apex). The 128‐ and 32‐channel coils showed similar SNR in the heart, likely dominated by the similar element diameters of these coils. The maximum G‐factor values were up to seven times better for a seven‐fold acceleration factor (R = 7) compared to the 24‐channel coil and up to two‐fold improved compared to the 32‐channel coil. The ability of the 128‐channel coil to facilitate highly accelerated cardiac imaging was demonstrated in four volunteers using acceleration factors up to seven‐fold (R = 7) in a single spatial dimension. Magn Reson Med 59:1431–1439, 2008. © 2008 Wiley‐Liss, Inc.