bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preoperative estimation of the liver graft weight in adult right lobe living donor liver transplantation using maximal portal vein diameters
Authors: Wang Frank , Pan Kuang-Tse , Chu Sung-Yu , Chan Kun-Ming , Chou Hong-Shiue , Wu Ting-Jung , Lee Wei-Chen 
Published: January 2011

Abstract
An accurate preoperative estimate of the graft weight is vital to avoid small-for-size syndrome in the recipient and ensure donor safety after adult living donor liver transplantation (LDLT). Here we describe a simple method for estimating the graft volume (GV) that uses the maximal right portal vein diameter (RPVD) and the maximal left portal vein diameter (LPVD). Between June 2004 and December 2009, 175 consecutive donors undergoing right hepatectomy for LDLT were retrospectively reviewed. The GV was determined with 3 estimation methods: (1) the radiological graft volume (RGV) estimated by computed tomography (CT) volumetry; (2) the computed tomography-calculated graft volume (CGV-CT), which was obtained by the multiplication of the standard liver volume (SLV) by the RGV percentage with respect to the total liver volume derived from CT; and (3) the portal vein diameter ratio-calculated graft volume (CGV-PVDR), which was obtained by the multiplication of the SLV by the portal vein diameter ratio [PVDR; ie, PVDR = RPVD2/(RPVD2 + LPVD2)]. These values were compared to the actual graft weight (AGW), which was measured intraoperatively. The mean AGW was 633.63 ± 107.51 g, whereas the mean RGV, CGV-CT, and CGV-PVDR values were 747.83 ± 138.59, 698.21 ± 94.81, and 685.20 ± 90.88 cm3, respectively. All 3 estimation methods tended to overestimate the AGW (P < 0.001). The actual graft-to-recipient body weight ratio (GRWR) was 1.00% ± 0.19%, and the GRWRs calculated on the basis of the RGV, CGV-CT, and CGV-PVDR values were 1.19% ± 0.25%, 1.11% ± 0.22%, and 1.09% ± 0.21%, respectively. Overall, the CGV-PVDR values better correlated with the AGW and GRWR values according to Lin's concordance correlation coefficient and the Landis and Kock benchmark. In conclusion, the PVDR method is a simple estimation method that accurately predicts GVs and GRWRs in adult LDLT.
Liver Transpl, 2011. © 2011 AASLD.
Continuous‐wave scanning terahertz near‐field microscope
Authors: Guillet J.‐P. , Chusseau L. , Adam R. , Grosjean T. , Penarier A. , Baida F. , Charraut D. 
Published: January 2011

AbstractA versatile cw measurement setup for terahertz near‐field reflectometry is proposed. Propagation, coupling, and focusing of wire guided modes are used to achieve a λ/33 resolution while imaging a metal corner deposited on glass. The setup is source and detector independent owing to wave coupling and decoupling with differential phase plates. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:580–582, 2011; View this article at wileyonlinelibrary.com. DOI 10.1002/mop.25754
Low‐cost and high‐gain dual‐polarized antenna for millimeter‐wave applications: Experimental results
Authors: Perron Alexandre , Denidni Tayeb A. , Sebak Abdel R. 
Published: January 2011

AbstractThis article presents a new dual‐fed dual‐polarized antenna for millimeter‐wave applications.Measurements show that both a wide impedance bandwidth and a relatively high gain are achieved with a simple hybrid configuration. In addition, the measured isolation between the two ports is better than 20 dB across most of the operating band. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:569–571, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25755
Particle swarm optimization in the determination of the optimal bias current for noise performance of gallium nitride HEMTs
Authors: Ross Tyler , Cormier Gabriel , Hettak Khelifa , Amaya Rony E. 
Published: January 2011

AbstractGallium nitride has attracted a great deal of interest in recent years due to its power handling ability. In addition, its noise performance is known to be good. In this letter, we present a method for determining the bias current density needed to obtain optimal noise figure for gallium nitride high‐electron mobility transistors (HEMTs). Particle swarm optimization is used to fit transistor S parameters to a model, enabling the calculation of the transistor's two‐port noise parameters. This process is performed for different bias points for different‐sized transistors, leading to the conclusion that a current density of 0.3 mA/μm yields the best minimum noise figure. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:652–656, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25758
A stub‐loaded perturbed monopole antenna for wireless USB dongles
Authors: Hwang Keum Cheol 
Published: January 2011

AbstractA compact monopole antenna with a tuning stub for USB dongle applications is proposed. The proposed stub‐loaded monopole antenna covers the WiBro, WLAN, WiMAX, and S‐DMB (Satellite Digital Multimedia Broadcast) bands. The overall dimension of the fabricated antenna is 20 × 50 × 0.8 mm3. The measured −10 dB reflection bandwidths for two resonant frequencies are 25.5% (2105–2720 MHz) and 12.8% (5145–5848 MHz). The radiation patterns approximate an omni‐directional pattern. The measured peak gain of the antenna is 3.67 dBi. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:519–523, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25760
Experimental demonstration of left‐handed transmission properties of metamaterials based on split‐ring pairs
Authors: Cheng Zhengze , Cheng Yongzhi 
Published: January 2011

AbstractWe investigated numerically and experimentally the left‐handed (LH) properties of the metamaterial based on square split‐ring resonator (SRR) pairs. The square SRR pairs metamaterial simultaneously show an electric and magnetic response to incident electromagnetic wave, and exhibit broad LH bandwidth by the standard retrieval methods. The thickness of dielectric substrate spacer was varied to examine the LH transmission properties of the SRR pairs structure by experiments. It was found that the LH transmission passband slightly shift to low frequency with increasing of thickness ts. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:615–618, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25764
A novel miniaturized dual‐band power divider using microstrip coupled transmission lines
Authors: Faraji Tayeb , Nosrati Mehdi , Hazeri Alireza 
Published: January 2011

AbstractA miniaturized dual‐band Wilkinson power divider is designed and proposed using coupled transmission lines. The main part of the component consists of a microstrip hairpin resonator, which is implemented in a way to provide an artificial inductor and a capacitor between the two output ports. A lucid equivalent circuit model is synthesized for this model. To optimize the performance of the power divider, electromagnetic simulation has been used to tune its dimensions. The simulated and measured results are in good agreement. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:676–679, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25767
Dual‐mode bandpass filter using internally coupled stub‐loaded resonators
Authors: Hua Changzhou , Miao Chen , Li Bo , Wang Hui , Wu Wen 
Published: January 2011

AbstractA dual‐mode bandpass filter using stub‐loaded resonators with internal coupled lines for high‐selectivity application has been presented. Based on the odd‐ and even‐mode equivalent circuits, the resonant characteristics of the proposed microstrip resonator are investigated. The proposed resonator is found to have the merit that the even‐mode resonant frequencies can be flexibly controlled, whereas the odd‐mode resonant frequencies are unaffected. It is also found that there is a finite‐frequency transmission zero inherently through the stopband. Based on the proposed resonator, a compact and high‐selectivity bandpass filter is demonstrated. Experimental results are presented, which confirm our idea. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:643–646, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25769
Design of tapered slot Vivaldi antenna for UWB breast cancer detection
Authors: Lazaro A. , Villarino R. , Girbau D. 
Published: January 2011

AbstractA tapered slot antenna to be used in ultra wideband microwave imaging systems aimed for early breast cancer detection is presented. A synthetic array is designed to operate across the ultra wideband frequency band in the air. The mutual coupling effects between the antennas have been investigated to verify the feasibility of the antenna for medical imaging applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:639–643, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25770
Simultaneous generation of AND and OR gates by dark–bright soliton conversion
Authors: Phattaraworamet Thanawat , Jomtarak Rangsan , Mitatha Somsak , Yupapin P. P. 
Published: January 2011

AbstractIn this article, a novel system of simultaneous optical logic AND and OR gates using dark–bright soliton conversion within the add/drop optical filter system is proposed. The input logic “0” and control logic “0” are formed by using the dark soliton pulse (D) trains. We found that the simultaneous optical logic AND and OR gates at the drop and through ports can be formed, respectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:514–516, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25776
Printed CP slot antenna design for GPS/WiMAX applications
Authors: Tseng Ching‐Fang , Yang Pai‐Chuan , Lai Chun‐Hung , Lyu Yuan‐Ping , Liu Yu‐Lun 
Published: January 2011

AbstractIn this article, a design of planar circularly polarized slot antenna is presented. The proposed antenna has a simple structure consisting of a modified circle‐like slot ground plane, T‐shaped structure act as a tuning stub of the antenna, placed at the opposite side of the feed. The parametric analysis of the antenna is done by the available electromagnetic solver HFSS. The proposed antenna is developed, and its measured characteristics are in good agreement with the simulated results. From experimental results, the antenna can generate two bands centered at about 1.59 and 3.78 GHz to cover the global position system and the 3.5‐GHz WiMAX band. Good return loss and radiation pattern characteristics are obtained over the two operation bands. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:488–491, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25780
A design methodology for the 60 GHz CMOS power amplifier using on‐chip transformers
Authors: Kim Ki‐Jin , Ahn K.H. , Lim T. H. , Park Hyun Chul , Yu Jong‐Won 
Published: January 2011

AbstractThis letter presents a design methodology for the millimeter wave amplifier using 90‐nm Taiwan Semiconductor Manufacture Company (TSMC) CMOS technology. The proposed design scheme with mathematically modeled transmission lines and interstage matching transformers illustrates how to design a millimeter amplifier considered in the maximum power transfer. The single‐ended transformer‐coupled CMOS PA is implemented to verify the design methodology. The design consists of neutralized common source (CS) amplifiers, matching transmission lines, and 3D modeled transformers. The designed circuit shows 16.2‐dB gain and 9‐dBm saturation power over 60‐GHz channel. The measured results are well matched with the proposed modeling results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:506–509, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25782
A broadband inverted Doherty power amplifier for IEEE 802.11b/g WLAN applications
Authors: Jin Shilei , Zhou Jianyi , Zhang Lei 
Published: January 2011

AbstractA broadband inverted Doherty power amplifier (IDPA) is proposed in this article. To achieve the tradeoff between efficiency and operation bandwidth, an optimized output matching network and offset lines are used to design the load network of the proposed power amplifier (PA). For experimental verification, a conventional IDPA and a class‐AB biased balanced PA have been implemented. In addition, a 64‐QAM modulated signal with 24‐MHz channel bandwidth are applied as excitation. According to experiment results, the proposed Doherty power amplifier can keep power‐added efficiency (PAE) higher than 31% from 2.4 to 2.5 GHz with 0.5 dB output‐power flatness at 27‐dBm output power. The PAE of the proposed PA is 16.4% and 4.2% higher than the balanced PA and the conventional IDPA respectively. In addition, the linearity of the proposed PA is improved effectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:636–639, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25785
Parallel metal‐plated tuning fork shaped omnidirectional monopole antenna for UWB application
Authors: Mishra S. K. , Gupta R. K. , Mukherjee J. 
Published: January 2011

AbstractThis article proposes a parallel metal‐plated tuning fork‐shaped omnidirectional antenna for UWB application.Printed monopole antennas fabricated on a substrate offer impedance band width, which can cover UWB. However, radiation pattern varies significantly over the bandwidth. The cross polar component increases with frequency and the pattern degrades from the desired omnidirectional characteristics. Omnidirectional radiation bandwidth can be increased significantly by decreasing the substrate thickness and using substrate material of low dielectric constant. In the proposed antenna, omnidirectional radiation bandwidth is further increased by using rectangular strips on both sides of a semi annular ring monopole antenna. The proposed metal‐plated structure using foam dielectric is designed, fabricated, and tested. The measured voltage standing wave ratio (VSWR) is <2 over 3.1–10.6 GHz frequency band. The antenna offers high efficiency, low cross polarization and its radiation patterns indicate its suitability for UWB applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:601–604, 2011; View this article at wileyonlinelibrary.com. DOI 10.1002/mop.25786
Experimental demonstration of an all‐fiber variable optical attenuator based on liquid crystal infiltrated photonic crystal fiber
Authors: Mathews Sunish , Farrell Gerald , Semenova Yuliya 
Published: January 2011

AbstractThe application of a nematic liquid crystal infiltrated solid core photonic crystal fiber as a novel all‐fiber in‐line electronically controlled broadband fiber optic attenuator in the wavelength range from 1500 to 1600 nm is demonstrated.The device based on photonic bandgap transmission is electronically controlled and, due to its compact configuration, can be easily incorporated into an optical network. A low‐insertion loss at zero attenuation state and a high‐extinction ratio of ∼40 dB are obtained between the high and low transmission states of the attenuator. The device works on the application of a varying voltage applied perpendicular to the fiber axis. The attenuation varies linearly with an increase in voltage, with a ∼3.5 V increment required for 1 dB attenuation. The device is shown to have a flat spectral response for all attenuation states in the wavelength range. The device can be used as the core of a highly efficient in‐line electronically controlled variable fiber optic attenuator. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:539–543, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25789
Multiband printed dipole antenna with log‐periodic toothed structure for WLAN/WiMAX applications
Authors: Nouri H. , Nourinia J. , Ghobadi Ch. 
Published: January 2011

AbstractIn this article, a novel printed dipole antenna using log‐periodic toothed structure is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The operating frequencies of the proposed antenna are 2.4/5.2/5.8 GHz, which covers WLAN system and 2.5/3.5/5.5 GHz for WiMAX system. The desired resonant frequencies are obtained by adjusting the number of log‐periodic teeth. Also by cutting two slots in the both sides of microstrip feedline on the ground plane, much wider impedance bandwidth can be produced. Prototypes of the proposed antenna have been constructed and studied experimentally. The measured results show good agreement with the numerical prediction and good multiband operation. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:536–539, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25790
Controlling polarization of an optical carrier of double sideband‐suppressed carrier modulated lightwave for improving characteristics of a sub‐terahertz continuous wave generated by photomixing
Authors: Kim Sungil , Kang Kwang‐Yong 
Published: January 2011

AbstractTo improve characteristics of a sub‐terahertz (THz) continuous wave (CW) as controlling polarization of an optical carrier for increase of optical carrier suppression levels, an orthogonally polarized extra optical signal with the same wavelength of an optical carrier was added to the double sideband‐suppressed carrier modulated lightwave (DSB‐SC).Compared with the traditional DSB‐SC, the phase noise and output power characteristics of the sub‐THz CW were improved about 3 dB (50%) at 10 KHz offset frequency and about 2 dB (37%) at 0.1 THz center frequency. Consequently, the controlling polarization technique of the optical carrier can be helpful to make the cost‐saving sub‐THz systems without high‐cost optical filters to increase the optical carrier suppression levels. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:626–630, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25795
A novel Minkowski‐island‐based fractal patch for dual‐mode and miniaturization band‐pass filters
Authors: Liu Ji‐Chyun , Chiu Ssu‐Hung , Kuei Ching‐Pin , Zeng Bing‐Hao 
Published: January 2011

AbstractA miniaturized dual‐mode band‐pass filter (BPF) using Minkowski‐island‐based (MIB) fractal patch resonator is presented in this article. The BPF is mainly formed by a λg/4 square patch resonator, which is a MIB fractal configuration with second order iteration is embedded in the patch. By tuning the perturbation, which resulted from the fractal patch, two resonant modes are excited and a pair of transmission zeros are generated to improve the BPF performance. The proposed filter at center frequency (f0) of 630 MHz has very good measured characteristics including the bandwidth of 552–708 MHz (3‐dB fractional bandwidth of 24.8%), low insertion loss of –1.38 dB and size reduction with 76.4%. The filter performance is characterized to verify the design concept. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:594–597, 2011; View this article at wileyonlinelibrary.com. DOI 10.1002/mop.25796
Integrated azimuthal lithium niobate electro‐optical electromagnetic field sensor with Mach–Zehnder waveguide modulator and micromultiannular antenna
Authors: Lee Ching‐Ting , Huang Wei‐Hsiang 
Published: January 2011

AbstractA micromultiannular antenna was integrated with Mach–Zehnder modulator in a LiNbO3 electro‐optical electromagnetic field sensor to measure multiple frequency response. The center response frequency of the multiannular antenna of the electromagnetic field sensor was 1.4, 2.8, and 5.2 GHz, respectively. The sensor system exhibited an average linear dynamic range of 66 dB. The minimum detectable electromagnetic field intensity of the sensor was 2.24, 3.98, and 7.07 mV/m at 1.4, 2.8, and 5.2 GHz, respectively. Furthermore, a system combined with three similar electromagnetic field sensors had function of detecting azimuth source without the effect of the rotating angle of sensor probe around its axis. The directional sensitivity pattern of the electro‐optical electromagnetic field sensor system revealed uniform sensitivity. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:565–567, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25798
Accurate large‐signal characterization of LDMOSFET transistor in package
Authors: Tamoum Mohammed , Allam Rachid , Djahli Farid 
Published: January 2011

AbstractIn this article, we present an accurate characterization of the RF LDMOSFET transistors for the extracting of the large‐signal model. They are generally available encapsulated in package. A measurement of the package parameters are made only by removing the semiconductor chip. The transistor is then characterized by conventional method. The same component can be used in the desired function, thereby avoiding the technological dispersions. The LDMOSFET transistor used is a BLF2043F (NXP semiconductors). To validate our method, we implemented a 2.5‐GHz 10‐W power amplifier. The measured and simulated results match very well. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:575–579, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25800
Multilayered patches with tunable phase response for phased arrays at microwave frequencies
Authors: Padilla P. , Padilla J. L. , Fernández J. M , Sierra‐Castañer M. 
Published: January 2011

AbstractThis manuscript offers the design and prototyping of radiating elements with electronically tunable phase response, for reconfigurable patch array antennas. Different options are found in technical literature to obtain feasible reconfigurable array antennas: placing the active circuitry in the transmission lines or directly over the radiating element, obtaining the desired phase shift for each radiating element of the array. In this manuscript, the second option is selected and electronically reconfigurable stacked patches at Ku band (12 GHz) are designed and prototyped. Eventually, prototype measurements are offered. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:510–514, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25804
Isolation enhancement between two closely mounted antennas for indoor repeater systems
Authors: Kim Sung‐Joo , Harackiewicz Frances J. , Park Myun‐Joo , Kim Taekyun , Jung Woojae , Lee Jeongkwan , Lee Byungje 
Published: January 2011

AbstractThe effect of a frequency‐selective surface (FSS) on enhancing the isolation between a donor and a coverage antenna for indoor WCDMA repeater antenna systems is presented.A unit cell of the proposed FSS consists of a half‐wavelength resonator, an FR4 substrate, and a ground plane. Embedding it on the wall of each reflector for a donor and service antenna, the measured isolation enhancement is about 10 dB. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:697–700, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25806
Triple‐band antenna design using the matching circuit for DVB‐H/PCS/WLAN
Authors: Oh Seon Jeong , Park Sang Yong , Park Jong Kweon 
Published: January 2011

AbstractIn this article, we have proposed triple‐band antenna using matching circuit for DVB‐H/PCS/WLAN applications.The antenna consists of a radiating patch, two folded open strips, and matching circuit. The matching circuit has two chip capacitors and one chip inductor. Two folded open strips are used to obtain the resonances at PCS/WLAN bands. The proposed antenna was designed, fabricated, and measured. Good radiation characteristics have been observed over the operating frequency bands. Details of the proposed antenna design and the simulated and measured results are presented and discussed. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:532–536, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25807