bluuebunny/crossref_metadata_2025_split huggingface dataset:
HTS narrowband stripline filter at 2.1 GHz with high power handling capability
Authors: Guo Xubo , Zhang Xiaoping , Cao Bisong , Wei Bin , Mu Lijuan , Liang Yong , Gao Longma , Gao Baoxin 
Published: December 2006

AbstractThe design and fabrication of a high temperature superconducting stripline filter for high power application are presented. The measured results showed the filter had a 0.78% bandwidth at 2090 MHz. The input power increases to 36 dBm without evident change in insertion loss. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 254–257, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22103
New broadband dual‐printed inverted L‐shaped monopole antenna for tri‐band wireless applications
Authors: Rao Qinjiang , Denidni Tayeb A. 
Published: December 2006

AbstractA broadband printed monopole antenna is proposed for digital communication systems (DCS‐1800), personal communication services (PCS1900), and international mobile telecommunication (IMT‐2000) tri‐band mobile devices. The proposed antenna is composed of two inverted L‐shaped monopoles, and they are back‐to‐back shorted by the center strip of a coplanar waveguide feed. To improve bandwidth and impedance matching, a small gap is introduced in one of the L‐shaped monopoles. As a result, the dual‐monopoles with almost the same size can resonate at two different frequencies with the improved bandwidth and impedance matching. Once two frequencies are close to each other by adjusting the position of the gap, a broadband operation can be achieved to cover DCS, PCS, and IMT tri‐bands. To demonstrate the proposed design, simulated and measured results are presented and discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 278–280, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22107
Integral equation‐based overlapped domain decomposition method for the analysis of electromagnetic scattering of 3D conducting objects
Authors: Li Wei‐Dong , Hong Wei , Zhou Hou‐Xing 
Published: December 2006

AbstractAn integral equation‐based overlapped domain decomposition method (IE‐ODDM) is presented for the analysis of three‐dimensional (3D) electromagnetic scattering problems. Compared with the forward and backward buffer region iterative method proposed by Brennan et al., the convergence of the IE‐ODDM is faster due to the edge‐effect of the current in each subdomain being effectively depressed. Moreover, the iterative sequence among the subdomains of IE‐ODDM is more flexible, which means that asynchronous iteration and even parallel computing are doable. Simulated RCS results of several convex and concave 3D conducting objects verify the speedup and validity of this method. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 265–274, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22110
Design of a new impedance tuning network by using RC mutator
Authors: Kaya Adnan , Yuksel E. Yesim 
Published: December 2006

AbstractThe design of broadband active‐compensated antenna system is an important problem in commercial satellite, military, and high‐speed communication systems. And so, impedance matching networks are used extensively in radio transmission and receiving systems. In this paper, broadband impedance matching is proposed as a method to improve the matching level of microstrip antennas. The theoretical design, fabrication, and experimental implementation of compensated rectangular microstrip antenna with new configuration π‐matching network were presented. A new compensation network consisting of RC mutator circuit and discrete capacitors are employed at the input of the microstrip antenna operating at 2.5 GHz. The performance parameters of the designed microstrip antenna with and without compensation network were compared. The results show that compensation network can improve the return loss level from −5.9 to −13.01 dB and the resonant frequency can be controlled in a wide RF band. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 298–302, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22118
Probe‐fed microstrip antenna feed point optimization using a genetic algorithm and the method of moments
Authors: Namkung J. , Hines E. L. , Green R. J. , Leeson M. S. 
Published: December 2006

AbstractA new application of genetic algorithms (GAs) for feed point optimization of a coaxial probe fed E‐shape microstrip patch antenna is presented. The GA shows excellent results for finding the best feed point in a given antenna structure. The method of moments is used in this paper, employing Rao‐Wilton‐Glisson basis functions. The simulation results show that the E‐shape microstrip patch antenna performs well at ∼2.11 GHz with the minimum return loss of approximately −17.1 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 325–329, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22120
Silicon bulk micromachined FBAR filter and duplexer for advanced handset applications
Authors: Park Jae Yeong , Lee Kyeong Hak , Cheon Seong Jong 
Published: December 2006

AbstractSilicon bulk micromachined FBAR filters and duplexer have been developed. The proposed filters are comprised of several resonators and the duplexer is made with two filters and a phase delay line. The fabricated FBAR filters have insertion losses (IL) of −1.46 and −1.86 dB, return losses of −13 and −10 dB, stop band rejection of −14 and −33 dB, central frequency of 1.88 and 1.96 GHz, and size of 1.3 mm × 1.5 mm, respectively. The fabricated FBAR duplexer has insertion loss (IL) of −3.5 dB (Max.) in pass band and absolute attenuation of −42 dB (Min.) at transmitter to antenna ports, while it has IL of −4.5 dB (Max.) in pass band and absolute attenuation of −52 dB (Min.) at antenna to receiver ports. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 339–342, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22133
Cross‐slot coupled elliptical patch antenna circularly polarized for localization
Authors: Ghiotto Anthony , Bourry Mathieu , Wu Ke 
Published: December 2006

AbstractThis paper reports a circularly polarized cross‐slot coupled elliptical patch antenna for implementation in a new radio‐frequency identification and localization system currently under development. The radio‐frequency localization system in this work is composed of a reader and a semiactive tag (a battery feeds the tag to increase its reading range but the backscattering modulation principle is used to decrease its power consumption). The overall system is designed in the ISM frequency band of 5.8 GHz. This frequency band is a good compromise that permits a large bandwidth and a good range for use in a local positioning system (∼10 m). This antenna is to be used by the reader as its radiation pattern is semispherical. It provides the circular polarization required by the targeted application to allow the tag identification within any physical position. The antenna bandwidth and axial ratio were enhanced using a proper design and a cross‐slot feeding of the patch. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 336–339, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22136
Combined class F monolithic PA design
Authors: Colantonio Paolo , Giannini Franco , Giofrè Rocco , Limiti Ernesto 
Published: December 2006

AbstractExperimental results on two GaAs PHEMT MMIC Class F Power Amplifiers for X‐band applications are reported, aimed to validate a novel devices' combination method. In particular, 28.1 dBm output power with 44% power added efficiency and 30.6 dBm output power with 40% of power added efficiency were measured at 9.6 GHz, for single and combined devices amplifiers respectively. Both realised amplifiers exhibit 12% operating bandwidth. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 360–362, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22141
20 Gb/s all‐optical and gates and nor gates using cascaded SOAs
Authors: Zhang Xinliang , Zhao Chan , Liu Hairong , Liu Deming , Huang Dexiu 
Published: December 2006

AbstractBased on cross‐gain modulation (XGM) in cascaded semiconductor optical amplifiers (SOAs), all‐optical AND and NOR operations at 20 Gb/s were both realized in the same configuration. By controlling the input signal power, the two logic gates can be achieved from different output channels. Single‐port‐couple SOAs with 1000 μm active regions are exploited to improve the output performance. The dependence of the output characteristics on the input signal power and wavelength was also investigated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 484–487, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22144
Compact CPW‐fed square aperture CP antenna for GPS and INMARSAT applications
Authors: Sze Jia‐Yi , Ou Yu‐He 
Published: December 2006

AbstractThis study proposed a coplanar‐waveguide‐fed square aperture circularly polarized (CP) antenna for the global positioning system and the International Maritime Satellite applications. The CP radiation is achieved by loading the aperture with a T‐shaped and a spur‐like strip. With the dimensions of the T‐shaped strip fixed, the CP radiation can be tuned to the desired band in a certain frequency range by adjusting the spur‐like strip. The measured 3‐dB axial‐ratio band is around 1.59 GHz with a bandwidth of 11.1% and a gain of about 3 dBic. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 427–430, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22147
A wideband internal antenna with shorting strip for mobile handset
Authors: Jung Heekyung , Park Hoon , Hong Seokjin , Choi Jaehoon 
Published: December 2006

AbstractIn this article, a novel compact internal wideband planar inverted F‐antenna (PIFA) was designed. The proposed antenna consisted of a main patch with strip, rectangular slot, and shorting strip and occupied the total volume of 36 × 18 × 6 mm3. The dual band characteristic was achieved by changing the length of a main patch. A wide impedance bandwidth property was obtained by optimizing the length of shorting strip. The measured 6 dB return loss bandwidths were 22% at 977 MHz and 52.4% at 2025 MHz, respectively. The maximum gains at 915, 1785, 2045, 2450, and 2630 MHz were −0.48, 4.28, 2.79, 1.05, and 1.22 dBi, respectively. The overall radiation patterns are suitable for mobile communication application. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 424–427, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22148
Novel approach to optimizing a broadband right‐angle coaxial‐to‐microstrip transition
Authors: Roh Jin‐Eep , Li Jun‐Wen , Ahn Bierng‐Chearl , Park Chan‐Sik , Cha Eun‐Jong 
Published: December 2006

AbstractA new approach to the optimization of a broadband right‐angle coaxial‐to‐microstrip transition is presented. The right‐angle transition finds many applications where printed circuits need to be fed from behind the ground plane using coaxial connectors. To obtain low reflections over the whole operating frequency range of the transition, dimensional parameters, such as ground aperture and probe diameters, ground aperture offset, and microstrip stub length are optimized using a commercial electromagnetic simulation software. Results are presented for the optimum right‐angle transition from an SMA connector to a 50‐Ω microstrip line on common reinforced PTFE substrates. Measurements of a fabricated transition on a 31‐mil thick substrate show that its reflection coefficient is less than −20 dB and the insertion loss is less than 0.5 dB over 0.05–20 GHz. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 451–456, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22151
Analysis of varactor loaded active microstrip antenna
Authors: Gautam A. K. , Vishvakarma B. R. 
Published: December 2006

AbstractTheoretical analysis for varactor loaded active microstrip antenna with coplanar parasitic element is proposed, in which the operating frequency of the rectangular microstrip antenna is electronically controllable with the bias voltage of the varactor. Theoretical investigations are based on circuit model and simulation with MOM based IE3D simulator is carried out. It is found that the antenna shows wide tunability of 373 MHz (23.5%) and 357 MHz (24.45%) for without and with coplanar parasitic elements, respectively. Antenna shows 5% instantaneous bandwidth. Theoretical and simulation results show a relatively good agreement with reported results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 416–421, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22154
Circuit modeling of micromachined transitions for MEMS tunable filters
Authors: Lee Yongshik , Margomenos Alexandros 
Published: December 2006

AbstractThis letter presents circuit modeling of micromachined transitions for interconnecting Coplanar Waveguides (CPW) on silicon to microstrip lines suspended on low‐loss membranes. The transition plays a critical role in developing MEMS tunable high‐Q filters for Ka‐ and U‐band applications. Exact circuit modeling of the transitions provides methods to design such structures without full‐wave simulations. Comparisons between the circuit model results and full‐wave simulation results, as well as the experimental results are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 477–478, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22155
RF balun embedded in multilayer organic substrate
Authors: Ihm Jae‐Yong , Hwang Kyu‐Pyung 
Published: December 2006

AbstractThis letter presents the design, modeling, and characterization of a RF balun embedded in multilayer organic substrate. A Marchand‐type balun for 2.4‐GHz Bluetooth and WLAN applications has been designed and fabricated using the low cost organic package technology. Its four‐port measurement results show good electrical performance and close correlation with full‐wave simulation data demonstrating the successful implementation of the RF passive component completely integrated in build‐up layers of an organic package substrate. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 473–475, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22163
Terahertz spectroscopy technology trend using 1550‐nm ultrafast fiber laser
Authors: Gong Y. D. , Chia M. Y. W. , Luo B. 
Published: December 2006

AbstractWideband terahertz (THz) wave generation and detection technologies and 1550‐nm ultrafast laser technologies are presented. The usage of a 1550‐nm ultrafast fiber laser will make the THz time domain spectroscopy system a more compact one with much lower costs. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 439–443, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22165
EMC internal GSM/DCS patch antenna for thin PDA phone application
Authors: Wu Chih‐Hsien , Wong Kin‐Lu , Row Jeen‐Sheen 
Published: December 2006

AbstractA promising application of the electromagnetic compatible (EMC) internal patch antenna centered at the top portion of the thin smart phone or personal digital assistant (PDA) phone is presented. The EMC antenna in this study is encircled by an L‐shaped shielding wall, which also serves as part of the antenna's ground plane and is centered above the top edge of the system ground plane. This arrangement is different from the general case of the internal patch antenna mounted on one side of the system ground plane. In this case, with the LCD monitor, battery, and associated electronic components generally mounted on both sides of the system ground plane, the required housing thickness for the PDA phone can be decreased. This makes it easy to achieve a thin PDA phone of thickness about 10 mm only. In addition, the studied antenna uses a simple radiating metal pattern of a long folded strip and a short spiral strip for generating two wide bands for GSM/DCS operation. This simple radiating metal pattern makes it easy to control the antenna's two excited resonant modes for GSM/DCS operation. Also, effects of the user's hand holding the thin PDA phone with the studied antenna are analyzed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 403–408, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22167
Assessment of a simple technique for the computation of singular potential and reaction integrals occurring in thin‐wire antenna analysis
Authors: Papakanellos P. J. 
Published: December 2006

AbstractWhen applied on the basis of the exact cylindrical wire kernel, thin‐wire moment‐method formulations yield singular integrals, the direct numerical calculation of which possesses certain difficulties. The scope of this work is the assessment of a simple singularity isolation technique for the accurate evaluation of typical potential and reaction integrals arising in moment‐method analysis of cylindrical antennas. The extracted singular part of these integrals is obtained analytically by properly approximating the singular integrands within a small area embracing the singularity. Numerical results illustrate the accuracy and effectiveness of the proposed technique over a wide range of segment lengths. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 462–467, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22172
Glycolysis of flexible polyurethane foam in recycling of car seats
Authors: Beneš Hynek , Rösner Jiří , Holler Petr , Synková Hana , Kotek Jiří , Horák Zdeněk 
Published: December 2006

AbstractFlexible polyurethane foam scrap was chemically decomposed via glycolysis. Optimal reaction conditions for glycolysis were determined: temperature, 220°C, polyurethane/glycol ratio, 1:1; reaction time, 2.5 hr; diethylene glycol or dipropylene glycol as reagents. Two types of polyurethane scrap were tested; both gave the recycled polyols having the same properties, which is advantageous for possible applications on a commercial scale. A mixture of the virgin and recycled polyols (up to 36 wt%) was used to manufacture rigid polyurethane foams. No undesirable influence of the recyclates on process parameters (cream time, gel time) was found. The end‐use properties of the rigid foams were practically the same in the whole range of tested concentrations of recyclates. A fine cellular structure of all tested foams was found. Copyright © 2006 John Wiley & Sons, Ltd.
Achieving 80% ten‐fold cross‐validated accuracy for secondary structure prediction by large‐scale training
Authors: Dor Ofer , Zhou Yaoqi 
Published: December 2006

AbstractAn integrated system of neural networks, called SPINE, is established and optimized for predicting structural properties of proteins. SPINE is applied to three‐state secondary‐structure and residue‐solvent‐accessibility (RSA) prediction in this paper. The integrated neural networks are carefully trained with a large dataset of 2640 chains, sequence profiles generated from multiple sequence alignment, representative amino acid properties, a slow learning rate, overfitting protection, and an optimized sliding‐widow size. More than 200,000 weights in SPINE are optimized by maximizing the accuracy measured by Q3 (the percentage of correctly classified residues). SPINE yields a 10‐fold cross‐validated accuracy of 79.5% (80.0% for chains of length between 50 and 300) in secondary‐structure prediction after one‐month (CPU time) training on 22 processors. An accuracy of 87.5% is achieved for exposed residues (RSA >95%). The latter approaches the theoretical upper limit of 88–90% accuracy in assigning secondary structures. An accuracy of 73% for three‐state solvent‐accessibility prediction (25%/75% cutoff) and 79.3% for two‐state prediction (25% cutoff) is also obtained. Proteins 2007. © 2006 Wiley‐Liss, Inc.
Synergism studies with binary mixtures of pyrethroid, carbamate and organophosphate insecticides on Frankliniella occidentalis (Pergande)
Authors: Bielza Pablo , Espinosa Pedro J , Quinto Vicente , Abellán Jaime , Contreras Josefina 
Published: December 2006

AbstractThe major mechanism of resistance to most insecticides in Frankliniella occidentalis (Pergande) is metabolic, piperonyl butoxide (PBO) suppressible, mediated by cytochrome‐P450 monooxygenases and conferring cross‐resistance among insecticide classes. The efficacy of insecticide mixtures of acrinathrin, methiocarb, formetanate and chlorpyrifos was studied by topical exposure in strains of F. occidentalis selected for resistance to each insecticide. The method consisted in combining increasing concentrations of one insecticide with a constant low rate of the second one as synergist. Acrinathrin activity against F. occidentalis was enhanced by carbamate insecticides, methiocarb being a much better synergist than formetanate. Monooxygenase action on the carbamates would prevent degradation of the pyrethroid, hence providing a level of synergism by competitive substrate inhibition. However, the number of insecticides registered for control of F. occidentalis is very limited, and they are needed for antiresistance strategies such as mosaics and rotations. Therefore, a study was made of the synergist effect of other carbamates not used against thrips, such as carbofuran and carbosulfan, against a susceptible strain and a field strain. Neither carbamate showed synergism to acrinathrin in the susceptible strain, but both did in the field strain, carbosulfan being a better synergist than carbofuran. The data obtained indicate that low rates of carbamates could be used as synergists to restore some pyrethroid susceptibility in F. occidentalis. Copyright © 2007 Society of Chemical Industry
Bayesian analysis of non‐homogeneous Markov chains: Application to mental health data
Authors: Sung Minje , Soyer Refik , Nhan Nguyen 
Published: December 2006

AbstractIn this paper we present a formal treatment of non‐homogeneous Markov chains by introducing a hierarchical Bayesian framework. Our work is motivated by the analysis of correlated categorical data which arise in assessment of psychiatric treatment programs. In our development, we introduce a Markovian structure to describe the non‐homogeneity of transition patterns. In doing so, we introduce a logistic regression set‐up for Markov chains and incorporate covariates in our model. We present a Bayesian model using Markov chain Monte Carlo methods and develop inference procedures to address issues encountered in the analyses of data from psychiatric treatment programs. Our model and inference procedures are implemented to some real data from a psychiatric treatment study. Copyright © 2006 John Wiley & Sons, Ltd.