bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multi‐band internal monopole antenna for mobile station
Authors: Min Kim Sung , Suk Yoon Ki , Bin Park Su , Geun Yang Woon , Ki Kim Nam , Lee Jong Hyuk 
Published: November 2007

AbstractIn this paper, we propose a multi‐band internal monopole type antenna for mobile station. We design and implement the multi‐band internal monopole type antenna for cellular (824–894 MHz), GPS (Global Positioning System: 1575.42 MHz), K‐PCS (Korea‐Personal Communication Service: 1750–1870 MHz), and S‐DMB (Satellite‐Digital Multimedia Broadcasting: 2630–2655 MHz) frequency bands with three branch lines. The antenna size of example design is 42.5 mm × 7 mm × 6.5 mm. Ground size is 67 mm × 42 mm, and the proposed antenna is located at 3 mm away from the top portion of ground plane. The proposed antenna shows a monopole‐like radiation pattern. Measured peak gains are −1.63 dBi at 0.859 GHz, 1.76 dBi at 1.575 GHz, 3.89 dBi at 1.810 GHz, and 5.57 dBi at 2.642 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 241–244, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23024
Comments on “Magnitude of the Voltage Reflection Coefficient of Terminated Reciprocal Uniform Lossy Transmission Lines”
Authors: Dutta Roy S. C. 
Published: November 2007

AbstractIt is pointed out that the results reported in the above titled letter [Torrungrueng et al., Microwave Opt Technol Lett 49 (2007), 1516–1519] are already known. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 176–177, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23029
Low profile and small size frequency notched planar monopole antenna from 3.5 to 23.64 GHz
Authors: Naeem Khan Salman , Xiong Jiang , He Sailing 
Published: November 2007

AbstractA small size and low profile microstrip fed frequency notched planar monopole ultra wideband (UWB) antenna with an arc shaped slot etched on a circular disk is proposed. The effect of different dimensions of the slotted arc are analyzed and optimized to obtain simultaneously the UWB and the band rejected performance. The return loss from (3.5–23.64 GHz) along with a notched frequency band (5.23–5.8 GHz) and quasi omni‐directional radiation pattern is observed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 235–236, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23030
A flat gain/power responses 618 GHz power amplifier MMIC with high PAE by using transformer networks
Authors: Yu Shu‐Jenn , Hsu Wei‐Chou , Lee Ching‐Sung , Chang Chian‐Sern , Wu Chang‐Luen , Chang Ching‐Hsueh 
Published: November 2007

AbstractA two‐stage power amplifier monolithic microwave integrated‐circuit, operating between 6 and 18 GHz by implementing AlGaAs/InGaAs/GaAs pseudomorphic high electron mobility transistors is presented. This devised power amplifier has demonstrated flat gain and power responses over a wide bandwidth by employing a novel design approach of combined prematched LC network and multisection impedance transformer network. Superior gain flatness of ±1.5 dB and power flatness of ±1.1 dBm over 6–18 GHz bandwidth, respectively, have been successfully achieved. With a dual‐bias configuration, the power amplifier shows average small‐signal gain of 13 dB, 2‐dB gain compression power of 32.4 dBm and high power‐added efficiency (PAE) of 24–34.5%. In additions, by using off‐chip combiner techniques, the balanced power amplifier shows superior maximum output power of 36.5 dBm and PAE of 22–33.1%. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 205–208, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23033
FDTD analysis of pulse propagation on microstrip line and an exponentially parallel plate antenna produced by photoconductive switches applied bias voltage
Authors: Yanwu Zhu , Shunxiang Shi , Yanling Sun 
Published: November 2007

AbstractThe d'Alembents formula with one free end was used to understand the pulse produced by photoconductive semiconductor switch (PCSS) and propagating in microstrip‐line at the bias voltage. A total reflection border was given for keep the steady electric field in order that the propagation of pulse in the microstrip line could be analyzed by finite time difference domain method. The reflection parameter of this border was computed. The border and a simple model of photoconductive switches were used to analyze the process of pulse transmitting in the microstrip line. The electric field distributions at the different time were given. The experiment result has proven that there is excellent agreement between the simulated and measured version of pulse output. An exponentially parallel plate antenna loaded with dielectric using PCSS was designed and analyzed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 168–172, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23035
A low power CMOS divide‐by‐3 LC‐tank injection locked frequency divider
Authors: Jang Sheng‐Lyang , Hsung Yeh Wei , Lee Chien‐Feng , Juang M.‐H. 
Published: November 2007

AbstractThis article presents a divide‐by‐3 CMOS injection locked frequency divider (ILFD) fabricated in a 0.18um CMOS process. The ILFD circuit is realized with a complementary Colpitts CMOS LC‐tank oscillator with an injection MOS connected between the voltage controlled oscillator (VCO) output and ground. The self‐oscillating VCO is injection‐locked by third‐harmonic input to obtain the division order of three. Measurement results show that at the supply voltage of 1.8 V, the free‐running frequency is from 2.63 to 3.29 GHz. At the incident power of −6.5 dBm, the locking range is from the incident frequency 8.84 to 9.90 GHz. At the supply voltage of 1.8 V, the core power consumption is 3.06 mW. The chip area is 0.972 × 0.574 mm2. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 259–263, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23036
Compact multiport antenna with isolated ports
Authors: Coetzee J. C. , Liu Y. 
Published: November 2007

AbstractThe small element spacing of compact multiport arrays introduces strong mutual coupling between the antenna ports. Because of this coupling, the input impedance of the array changes when elements excitations are varied, and consequently, the array cannot be matched for an arbitrary excitation. Decoupling networks have in the past been used to provide an additional connection between antenna ports to cancel the coupling between elements. An alternative approach is to design the antenna so that each port does not excite a single element, but instead all elements simultaneously. The geometry of the antenna is optimized so that this direct excitation of elements counteracts the mutual coupling, thus, yielding decoupled ports. This article describes the design of such a four‐port antenna. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 229–232, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23038
Coherence‐free microwave photonic filter using a electro‐absorption modulator in a double pass configuration and its application for harmonic suppression
Authors: Ning G. , Zhou J. Q. , Aditya S. , Shum P. 
Published: November 2007

AbstractA simple coherence‐free microwave photonic filter configuration is presented. It is based on an electroabsorption modulator in a double pass configuration, modulating the optical signal at different times. The configuration is free from the velocity mismatch and polarization dependence problems of elecro‐optic modulator. Measured results confirm the theoretical expressions and demonstrate a robust notch filter response without phase‐induced intensity noise. Application of the filter in suppressing the second harmonic of modulating radio frequency signal is also demonstrated. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 226–229, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23039
Investigation of interconnect loss due to coupling between two parallel microstrip lines in high‐speed design
Authors: Li Li‐Ping , Li Yu‐Shan , Pan Jian , Jia Chen , Zhang Mu‐Shui 
Published: November 2007

AbstractLoss due to coupling between two parallel microstrip lines is investigated in this paper. It is found that the transmission characteristic of the aggressor line was impaired by coupling. Most energy would be coupled to the victim line at resonant frequencies determined by the space between traces and the coupled length, which seriously affects the transmitted signals with high data rate. Two coupled microstrip lines are analyzed in terms of even and odd modes to explain this additional loss mechanism. Several design parameters are simulated. It is clearly shown that resonant frequencies increase with the space between traces and decrease with the coupled length. Electromagnetic simulations are also performed to illustrate this extra loss mechanism. Good agreement is seen between analytical and experimental analyses. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 197–202, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23041
A compact spiral stripline‐loaded monopole antenna with a vertical ground plane
Authors: Khang Nguyen Truong , Lee Keekeun , Choo Hosung , Park Ikmo 
Published: November 2007

AbstractIn this letter, we propose a compact spiral stripline‐loaded monopole antenna on a vertical ground plane. The measured results show that the antenna has a fractional bandwidth of 12.1% for a voltage standing wave ratio (VSWR) less than 2 at the center frequency of 1.10 GHz, as well as a good omni‐directional radiation pattern. The small size of 0.04 λo × 0.04 λo × 0.04 λo makes it promising for use as an internal antenna in mobile handsets. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 250–252, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23043
Tunable negative tap microwave photonic filter using an SOA in a Sagnac loop
Authors: Ning Guoxiang , Shum Ping , Aditya S. 
Published: November 2007

AbstractA novel tunable coherence‐free microwave photonic filter configuration is presented. This all‐optical structure realizes negative taps and works as a bandpass notch filter. The configuration is based on a Sagnac loop interferometer containing a single‐drive intensity modulator and a polarization‐maintaining semiconductor optical amplifier that generates phase difference between the clockwise and counterclockwise propagating waves inside the Sagnac loop. Measured results demonstrate a robust tunable bandpass notch response. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 225–226, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23044
CMOS switched resonator frequency divider tuned by the switch gate bias
Authors: Jang Sheng‐Lyang , Tsai Lin‐yen , Lee Chien‐Feng 
Published: November 2007

AbstractA switched resonator injection‐locked frequency divider (ILFD) designed and fabricated using a standard 0.18‐μm CMOS process is presented. The designed ILFD consists of double cross‐coupled MOS switching pairs that use the current reuse technique to save power dissipation, and a switched LC resonator. The latter is composed of an inductor, a capacitor, and an inductor–MOS–inductor composite in parallel. The gate bias of MOSFET in the switched resonator is used to tune the free running ILFD frequency and extend the locking range of the ILFD. Measurement results show that at the supply voltage of 1.8 V, the divider free‐running frequency is from 3.8 to 4.5 GHz, and at the incident power of 0 dBm the locking range is from the incident frequency of 7.6 to 9.26 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 222–225, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23045
GaInp/GaAs HBT broadband inductorless receiver
Authors: Wu Tzung‐Han , Meng Chinchun , Huang Guo‐Wei 
Published: November 2007

AbstractA GaInP/GaAs HBT broadband RF front‐end consisting of a low‐noise wideband amplifier and a micromixer is demonstrated in this article. The major advantage of this work is the elimination of inductors and thus the chip area can be greatly saved. The bandwidth of the RF front‐end is up to 7 GHz. The measured conversion gain is higher than 25 dB from 1 to 7 GHz and the noise figure of the RF front‐end is less than 8 dB within the bandwidth. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 247–250, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23048
Lossy LC ladder matching network for ultra‐wideband CMOS Gilbert cell mixer design
Authors: Liao Hsien‐Yuan , Tseng Ching‐Ming , Chiou Hwann‐Kaeo 
Published: November 2007

AbstractA 0.18‐μm CMOS broadband mixer for ultra‐wideband receivers is presented. A lossy LC ladder is utilized to achieve the broadband impedance match at the RF port. This circuit achieves high conversion gain of 10.4 dB, with 3‐dB bandwidth from 0.3 to 10.9 GHz and low power consumption of 15 mW under 2.5‐V supply voltage. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 220–222, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23050
Erratum: An omnipotent Smith chart for lossy nonreciprocal transmission lines
Authors: Wu Yongle , Huang Haiyu , Liu Yuanan 
Published: November 2007

AbstractOriginally published in Microwave Opt Technol Lett 49: 2392–2395, 2007. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 263, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23053
Erratum: Low phase noise 3‐42‐Gzilchlc signal generation using high‐order longitudinal modes of a coaxial loop cavity
Authors: Wang Xinyue , Wang Ziyu 
Published: November 2007

AbstractOriginally published Microwave Opt Technol Lett 49 (2007), 2329–2331. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 264, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23054
DIChirp: direct injection bandwidth estimation
Authors: Ozturk Yusuf , Kulkarni Manish 
Published: November 2007

AbstractIdeally, network bandwidth estimation algorithms should be independent of the end system performance. If end system capabilities are involved, then the measurement will be of the system throughput and will not indicate a correct assessment of network bandwidth. Packet dispersion‐based active bandwidth estimation schemes including Pathload, TOPP and pathChirp use delay correlation where the network‐induced delay on packets transmitted at certain rates is translated into bandwidth estimation. Since packet dispersion‐based active measurement schemes use delay correlation, bandwidth estimations are distorted by the host protocol stack‐induced delay variations. Studies revealed that the host protocol stack‐induced delay variations due to context switching are stovepiped in the network‐induced delay variations and impact the measurement process. This study explores the delay variations introduced by the host protocol stack in packet dispersion‐based techniques. The impact of host protocol delay variations and context switching on bandwidth estimation is analyzed and a new active bandwidth estimation tool minimizing the impact of context switching is proposed. Direct Injection Chirp (DIChirp) bypasses the TCP/IP protocol stack and directly interfaces with the network hardware. It uses the kernel for scheduling the outgoing packets, thus achieving more accurate estimation of bandwidth. Experiments revealed that the host protocol and context switching‐induced delay variations can be as high as 800µs and could result in bandwidth estimation errors near 20%. Experiments also revealed that the DIChirp is superior to the pathChirp implementation in performance estimation since the datapath utilized by DIChirp is less prone to delay variations induced by context switching. Copyright © 2007 John Wiley & Sons, Ltd.
Delay‐dependent robust passive control for a class of nonlinear systems with time‐varying delays
Authors: Qiu Jiqing , Gao Zhifeng , Xia Yuanqing , Zhang Jinhui 
Published: November 2007

AbstractIn this paper, the problem of robust passive control for a class of nonlinear systems with time‐varying delays is considered. The uncertainties investigated in this paper are norm bounded and time varying, and they enter all system matrices. Based on the Lyapunov–Krasovskii functionals approach, a new robust passive control criterion is proposed in terms of linear matrix inequalities, which is dependent on the size of time delay. We also design a state feedback controller that guarantees a robust asymptotically stable and strictly passive closed‐loop system for all admissible uncertainties. Finally, two numerical examples are given to illustrate the effectiveness of the developed techniques. Copyright © 2007 John Wiley & Sons, Ltd.
A review of charge transport and recombination in polymer/fullerene organic solar cells
Authors: Pivrikas A. , Sariciftci N. S. , Juška G. , Österbacka R. 
Published: November 2007

AbstractThe charge carrier transport and recombination in two types of thermally treated bulk‐heterojunction solar cells is reviewed: in regioregular poly(3‐hexylthiophene) (RRP3HT) mixed with 1‐(3‐methoxycarbonyl)propyl‐1‐phenyl‐[6,6]‐methanofullerene (PCBM) and in the blend of poly[2‐methoxy‐5‐(3,7‐dimethyloctyloxy)‐phenylene vinylene] (MDMO‐PPV) mixed with PCBM. The charge carrier mobility and bimolecular recombination coefficient have been comparatively studied by using various techniques including Time‐of‐Flight (ToF), Charge Extraction by Linearly Increasing Voltage (CELIV), Double Injection (DI) transients, Current–Voltage (I–V) technique. It was found that the carrier mobility is at least an order of magnitude higher in RRP3HT/PCBM blends compared to MDMO‐PPV/PCBM. Moreover, all used techniques demonstrate a heavily reduced charge carrier recombination in RRP3HT/PCBM films compared to Langevin‐type carrier bimolecular recombination in MDMO‐PPV/PCBM blends. As a result of long carrier lifetimes the formation of high carrier concentration plasma in RRP3HT/PCBM blends is demonstrated and plasma extraction methods were used to directly estimate the charge carrier mobility and bimolecular recombination coefficients simultaneously. A weak dependence of bimolecular recombination coefficient on the applied electric field and temperature demonstrates that carrier recombination is not dominated by charge carrier mobility (Langevin‐type recombination) in RRP3HT/PCBM blends. Furthermore, we found from CELIV techniques that electron mobility in RRP3HT/PCBM blends is independent on relaxation time in the experimental time window (approx. hundreds of microseconds to tens of milliseconds). This reduced carrier bimolecular recombination in RRP3HT/PCBM blends implies that the much longer carrier lifetimes can be reached at the same concentrations which finally results in higher photocurrent and larger power conversion efficiency of RRP3HT/PCBM solar cells. Copyright © 2007 John Wiley & Sons, Ltd.
High speed laser processing for monolithical series connection of silicon thin‐film modules
Authors: Haas Stefan , Gordijn Aad , Stiebig Helmut 
Published: November 2007

AbstractA detailed analysis of the monolithical series connection of silicon thin‐film modules with metal back contact fabricated by high‐speed laser ablation will be presented. In this study, optically pumped solid‐state lasers with wavelengths of 1064 nm and 532 nm were used for the patterning process. The influence of various laser parameters on the performance of amorphous and microcrystalline silicon modules will be discussed. In particular, the line‐scribing parameters for a TCO and Ag back contact system was analyzed in detail, since it is the most critical patterning step. A detailed description of the back contact ablation process will be presented and a criterion for flakeless patterning was defined. Finally the influence of the back contact patterning on the electrical behavior of silicon single junction cells was studied. The dark current density versus back‐contact patterning line length was analyzed by means of a developed SPICE (simulation program with integrated circuit emphasis) simulation model. Copyright © 2007 John Wiley & Sons, Ltd.
Nanoscale structure of solar cells based on pure conjugated polymer blends
Authors: Veenstra Sjoerd C. , Loos Joachim , Kroon Jan M. 
Published: November 2007

AbstractThis paper gives an overview of the status of photovoltaic devices based on blends of semiconducting polymers. The polymer blends form the bulk heterojunction in these photovoltaic devices. The fundamental mechanisms governing the performance of these devices are discussed as well as the specificities of these all‐polymer solar cells. The morphology of the polymer blend layer is expected to influence the device performance of these bulk heterojunctions. An overview is presented of factors that influence the morphology of the active layer of polymer blend photovoltaic devices together with a summary of tools available to study the structure of this layer. An advanced electron microscopy technique is applied to study the morphology of polymer blends of MDMO‐PPV and PCNEPV with differing molecular weights. It is shown that the molecular weight of the polymer influences the typical domain size from ∼200 nm down to less than 5 nm in these bulk heterojunction PV devices. No strong relation is observed between the typical length scale of the phase separated domains and the measured external quantum efficiency, indicating that the phases are intermixed. Copyright © 2007 John Wiley & Sons, Ltd.
Immunoproteomics of extracellular proteins of Chinese virulent strains of Streptococcus suis type 2
Authors: Zhang Wei , Lu Cheng Ping 
Published: November 2007

AbstractStreptococcus suis type 2 (SS2) is a porcine zoonotic pathogen with worldwide distribution, and lacking suitable vaccine and virulent maker were bottleneck to control this infection. An immunoproteomic assay was used to identify antigenic proteins from the total extracellular proteins of the virulent Chinese SS2 strain ZY05719. The convalescent serum of a specific pathogen free (SPF) mini‐pig recognized nine protein spots on PVDF membrane. Antigenic proteins on a duplicate gel, as well as those with a similar placement of extracellular proteins from another virulent strain (HA9801) and an avirulent strain (T15) on 2‐D gels, were excised and identified by MALDI‐TOF‐MS. PMF of the protein spots were performed using the MASCOT server. Two proteins were found in all three strains. Comparative proteomic analysis between the two virulent strains and the avirulent strain revealed nine differential proteins, eight of which were successfully identified. Genes for six of the differentially expressed proteins were found in both virulent strains, and of those were present in the avirulent stain.