bluuebunny/crossref_metadata_2025_split huggingface dataset:
A CPW‐FED compact inverted L‐strip UWB microstrip antenna
Authors: Gautam A. K. , Yadav Swati , Kanaujia Binod Kr 
Published: April 2013

AbstractA novel CPW‐fed compact inverted L‐strip ultra wideband (UWB) microstrip antenna is proposed for ultra wide band applications. The proposed antenna possesses a method to minimize the monopole antenna by loading of inverted L‐strip over the conventional monopole patch antenna to lower the height of the antenna. The ground was vertically extended toward two sides of the single radiator. Therefore, the large space around the radiator that is usually wasted can be effectively saved. The antenna is practically fabricated and simulated. Measured results show a good agreement with simulated results. The prototype with overall size of 25 × 25× 1.6 mm3 achieves good impedance matching, constant gain, stable radiation patterns, and constant group delay over an operating bandwidth of 2.6–13.04 GHz (10.44 GHz). © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1584–1589, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27651
Slot‐array antenna for UHF RFID shelf applications
Authors: Choi Wonkyu , Bae Ji‐Hoon , Chae Jong‐Suk , Park Chan‐Won , Pyo Cheolsig 
Published: April 2013

AbstractThis article presents a linearly polarized slot‐array antenna that consists of a slot series‐fed by a microstrip line for radio frequency identification (RFID) shelf applications in the ultra‐high frequency band in which the end of the microstrip line is shorted to the ground plane by a via‐hole. The radiating element is a U‐shaped slot etched in the ground plane on one side of a substrate and the microstrip line for feeding is etched on the other. The designed 6 × 3 array antenna has the near‐field distribution of electric field intensity from 0.5 to 3.36 V/m for RFID shelf applications. The fractional bandwidth for a reflection coefficient of less than −10 dB is approximately 5.5% at 920 MHz, ranging from 892 to 943 MHz. The antenna installed in the RFID shelf stably reads pharmaceutical products with various package options on the shelf. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1511–1515, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27653
Analytical models for predicting the effective permittivity of complementary metamaterial structures
Authors: Bait‐Suwailam Mohammed M. , Yousefi Leila , Alavikia Babak , Ramahi Omar M. 
Published: April 2013

AbstractWe present an analytical formula to calculate the resultant effective permittivity of a metamaterial medium composed of unit cells with complementary structures. Complementary metamaterial can be considered to be the complementary screen of artificial magnetic materials. Based on Babinet's principle and duality, complementary metamaterial provides a negative effective permittivity in the vicinity of its resonance frequency. The developed formula is general and predicts the effective permittivity for a specific topology. The derived model validated by comparison to results obtained using full‐wave simulation. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1565–1569, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27655
A new X‐band triple‐split ring resonator duplexer with high selectivity and adjustable size using mu‐negative metamaterial technique
Authors: Yoon Ki‐Cheol , Lee Hyunwook , Lee Jong‐Chul , Kim Ki‐Byoung , Kim Seong‐Cheol 
Published: April 2013

AbstractIn this article, a narrow‐bandwidth duplexer with a triple‐split ring resonator (T‐SRR) using mu‐negative metamaterial is presented. The T‐SRR not only has negative permeability at the operating frequency band but also flexibility in size adjustment. The experimental results for insertion and return losses are 1.33 and 16.1 dB with a bandwidth of 10% at a RX center frequency of 8 GHz, and they are 1.27 and 16.8 dB at the same bandwidth at a TX center frequency of 10 GHz, respectively. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1537–1540, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27656
All‐fiber temperature sensor based on few mode fiber and single‐mode fiber
Authors: Chen Daru , Jiang Xiaogang 
Published: April 2013

AbstractWe propose and demonstrate a novel all‐fiber temperature sensor that is a single‐end fiber modal interferometer (FMI) based on a segment of a few mode fiber (FMF) and a segment of a single‐mode fiber (SMF).The FMF spliced to a lead‐in SMF is used to expend the optical beam in the fiber and the sensing SMF with a well‐cleaved end is spliced to the FMF. Owing to the core mismatch between the FMF and the sensing SMF, part of the guided light propagates in the cladding of the sensing SMF and part of the guided light propagates in the core of the sensing SMF, which finally forms the FMI when the reflective light comes back to the FMF. Temperature sensing is achieved by measuring the wavelength shift of the FMI. A temperature sensor with an average sensitivity of 0.1 nm/°C in a temperature range from 33 to 833°C is presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1700–1703, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27657
V‐band millimeter‐wave microstrip to rectangular waveguide transition
Authors: Hammou Djilali , Nedil Mourad , Kandil Nahi , Moldovan Emilia , Tatu Serioja O. 
Published: April 2013

AbstractThis article proposes a novel millimeter‐wave microstrip (MSL) to WR 12 standard rectangular waveguide transitions. These dissimilar structures are interconnected via a substrate integrated waveguide (SIW). The MSL and the SIW are integrated on the same ceramic substrate of 9.9 relative permittivity and 125 μm thickness. The MSL was first transformed into an air‐filled rectangular waveguide, and then a stepped impedance or horn transformer was used to match the WR12 standard rectangular waveguide. The central frequency of operation is 61 GHz as required in V‐band wireless communications applications. Commercial Finite Element Method Software and High Frequency Structure Simulator (HFSS) was used to perform the design and the optimization. The S parameter measurements of the back‐to‐back connected transitions show an insertion loss less than 1.5 dB and a return loss better than −10 dB over a 4 GHz band from 60 to 64 GHz. The high performance, the compact size, and the simple fabrication, enable similar transitions to be employed in a number of other millimeter‐wave applications. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1696–1700, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27658
Beam tilting of single microstrip antenna using high permittivity superstrate
Authors: Attia Hussein , Siddiqui Omar , Ramahi Omar 
Published: April 2013

AbstractAntenna beam tilting or steering requires multiple antenna elements to be phase shifted and arranged in the form of an array. This article presents a novel method to tilt the main beam of a microstrip patch by partially covering it with a high dielectric‐constant superstrate. The beam tilting is possible because of the dual‐slot radiation mechanism of the microstrip antenna. In effect, the electromagnetic radiation from the covered radiating slot reaches the far‐field with an additional phase with respect to the uncovered slot, resulting in an inclined beam whose angle depends on the superstrate's refractive index. Experimentally and numerically, a beam deflection of 25° is achieved when a microstrip patch is partially covered with a superstrate having a dielectric constant of 10. Moreover, the proposed structure provides gain enhancement of about 3 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1657–1661, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27659
Four‐element microstrip array with polarization diversity
Authors: Ma Shun‐Lai , Shih Chuang Jiashih , Row Jeen‐Sheen 
Published: April 2013

AbstractA four‐element microstrip antenna array excited with a tunable feeding network is described.The feeding network is composed of three quasi‐lumped couplers and a 90° phase delay line. By controlling one dc bias, the network can provide the same amplitude and two different phase combinations, including (0°, 0°, 180°, 180°) and (0°, 90°, 180, 270°), for the four array elements. With the tunable feeding network, the excitation method of the array can be switched between sequentially rotated feed mechanism and differential‐feed mechanism. A reconfigurable array prototype is constructed. Experimental results show that the array has a broadside radiation and it can provide good linear and circular polarization performances at one frequency. Simulated results are also provided to validate the designs of the microstrip antenna array with switchable polarization. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1653–1657, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27660
Radio‐frequency microfluidic interferometer in printed circuit board process
Authors: Blankenagel Bryan S. , Khadka Shiul , Hawkins Aaron R. , Warnick Karl F. , Mazzeo Brian A. 
Published: April 2013

AbstractWe report a process to integrate microfluidic channels on standard radio‐frequency (RF) printed circuit board (PCB) substrate. A 10.56‐GHz RF microstrip interferometer was fabricated using the proposed technique and used to compare electrical responses for liquids with various dielectric properties and thereby demonstrate the capability of RF PCB‐integrated microfluidic devices for biological sensing. Microchannels were milled into a substrate and prepreg outlines for microchannels were cut using a laser system. Substrates were adhered and bonded by clamping and baking. The RF interferometer responded to changes in liquid permittivity with high sensitivity relative to many other types of dielectric sensors. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1616–1618, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.2766
Analysis of the quality factor of the optical half‐wavelength resonator
Authors: Belyaev Boris A. , Tyurnev Vladimir V. 
Published: April 2013

AbstractAn electrodynamic analysis of an optical resonator comprising a half‐wavelength dielectric layer that is covered from both sides by quarter‐wavelength layers with higher and lower refractive indices (RIs) is carried out.For such a resonator, the dependences of the external quality factor on number and RIs of the layers are obtained first. That allows one to determine minimum number of the layers in the structure to achieve the required quality factor at practically any contrast of the RIs. The results of this study provide an easy way to optimize the structures of 1D photonic crystal devices, particularly high‐selectivity bandpass filters. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1613–1616, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27662
A compact UWB CPW bandpass filter with short‐ended H‐shaped resonator and controllable notched band
Authors: Wang Kai , Wong Sai Wai , Chu Qing‐Xin 
Published: April 2013

AbstractAn ultra‐wideband (UWB) bandpass filter (BPF) using the hybrid microstrip and coplanar waveguide (CPW) structure is proposed in this article.The BPF composes of CPW feed lines and H‐shaped microstrip resonator. By a CPW/microstrip back‐to‐back coupling structure, the UWB BPF was realized with the passband covering the entire UWB band (3.1–10.6 GHz). A narrow notched band achieved by etching slots on the lower impedance part of the H‐shaped resonator to form an open circuit stub. At last, three U‐slot DGSs are used to achieve a good upper‐stopband rejection. The measured results are in good agreement with the simulated results. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1577–1581, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27663
Widely tunable L‐band multiwavelength brillouin‐erbium fiber laser incorporating a bismuth‐based erbium‐doped fiber
Authors: Wei Yizhen , Zhou Xuefang , Wang Tianshu 
Published: April 2013

AbstractWe have demonstrated a widely wavelength tunable Brillouin‐erbium fiber laser (BEFL) with multiwavelength lasing in the L‐band region. The Brillouin pump (BP) is injected from the external cavity and preamplified by an intracavity bismuth‐based erbium‐doped fiber amplifier (Bi‐EDFA) before entering the single‐mode fiber. By combining the broadband gain of Bi‐EDFA and BP preamplification technique within the linear cavity, our BEFL exhibits a broad tuning range of 65 nm from 1555 to 1620 nm, which is the widest one achieved in L‐band BEFLs to the best of our knowledge. The maximum number of wavelengths obtained within this wavelength range is 12 channels with a spacing of approximately 0.088 nm. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1574–1577, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27664
Design and implementation of a hybrid digital and RF front‐end module for 24‐GHz intelligent transport system pulse‐doppler radar
Authors: Ju Yeonghwan , Kim Sang‐Dong , Lee Jonghun 
Published: April 2013

AbstractThis article presents a hybrid digital and RF front‐end module (FEM) of a 24‐GHz pulse‐Doppler radar system for intelligent transport system applications. The conventional pulse generators use analog components such as step recovery diode. It is difficult to control the parameters of the pulse. In addition, the heterodyne architecture based transceivers show good performance, but they are very expensive. To overcome these limitations, a digital pulse generator was developed based on field‐programmable gate array platform to obtain high degree of freedom in a waveform design. Instead of the heterodyne architecture, a transceiver based on the homodyne architecture was developed. For the first time, hybrid digital FEM based 24‐GHz pulse‐Doppler radar was developed by combining a digital pulse generator and a homodyne‐based transceiver. Experimental results showed the feasibility of using a hybrid digital FEM for a 24‐GHz pulse‐Doppler radar. The developed hybrid digital FEM contributes to the advancement of the digital radar field. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1631–1638, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27666
Dual‐band bandpass filters based on dual‐mode hilbert fractal resonator
Authors: Crnojevic‐Bengin Vesna , Zemlyakov Kirill , Jankovic Nikolina , Vendik Irina 
Published: April 2013

AbstractWe propose a compact planar dual‐mode resonator based on a Hilbert fractal curve that operates at two arbitrary frequencies. The resonator is used to design two types of dual‐band bandpass filters for WLAN applications, which exhibit a good trade‐off between compact size and high performances, with the overall sizes ranging from 0.22 × 0.21 to 0.44 × 0.1 guided wavelengths and measured insertion losses from 0.38 to 2.5 dB. At the same time, the fabrication of filters is quite simple and requires no modifications in the ground plane or use of vias. In addition, the proposed resonator is used to design single‐band filters as well. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1440–1443, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27667
Erratum: Design of a multi‐band asymmetric patch antenna for wireless applications
Authors: Malekpoor Hossein , Jam Shahrokh 
Published: April 2013

AbstractOriginally published Microwave Opt Technol Lett 55:730–734, 2013. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1703, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27669 (Original article DOI 10.1002/mop.27449)
Degree and Direction of Paid Employee/Volunteer Interchange in Nonprofit Organizations
Authors: Chum Antony , Mook Laurie , Handy Femida , Schugurensky Daniel , Quarter Jack 
Published: April 2013

AbstractThis study builds on an earlier one (Handy, Mook, and Quarter 2008) that examined the degree of interchangeability between volunteers and paid employees in nonprofit organizations. In the current study, we surveyed 836 nonprofits in Canada to understand what factors determine the degree of interchange between paid employees and volunteers, bearing in mind that this interchange can go in two directions: paid employees for volunteers and volunteers for paid employees. We found the degree of interchange to be widespread and in both directions. One of the most important predictors of the likelihood of interchange was the number of full‐time employees, suggesting that interchangeability occurs less frequently in organizations with a larger number of employees than in those with fewer employees. Religious congregations and organizations with workload increases were more likely to interchange tasks among volunteers and paid staff.
The Hospital Foundation Strategy and Performance Relationship
Authors: Marlin Dan , Geiger Scott W. , Ritchie William J. 
Published: April 2013

AbstractAttracting philanthropic donations is a strategic imperative for many hospitals. A hospital can manage the giving process most effectively by developing a well‐managed hospital foundation. This study examines the hospital foundation strategy and performance relationship. Using a sample of 258 hospital foundations we identified different strategies and significant performance differences among them.
Obesity‐related dysregulation of the Tryptophan–Kynurenine metabolism: Role of age and parameters of the metabolic syndrome
Authors: Mangge Harald , Summers Kelli L. , Meinitzer Andreas , Zelzer Sieglinde , Almer Gunter , Prassl Ruth , Schnedl Wolfgang J. , Reininghaus Eva , Paulmichl Katharina , Weghuber Daniel , Fuchs Dietmar 
Published: April 2013

ObjectiveObesity‐related immune mediated systemic inflammation was associated with the development of the metabolic syndrome by induction of the tryptophan (TRP)–kynurenine (KYN) pathway. The study aimed to assess whether this holds true across the lifespan from juvenility to adulthood.Design and MethodsFive hundred twenty‐seven participants aged between 10 and 65 years were analyzed. Standard anthropometric measures, carotid ultrasound, and laboratory analysis including interleukin‐6, ultra‐sensitive C‐reactive protein, lipids, glucose metabolism, neopterin, TRP, KYN levels, and the KYN/TRP ratio were performed.ResultsOverweight/obese (ow/ob) adults had significantly increased KYN serum levels and a significantly increased KYN/TRP ratio. In sharp contrast, ow/ob juvenile males aged ≤18 years showed decreased, females similar KYN and KYN/TRP ratio in comparison to their control counterparts. Also, adult ow/ob subjects with metabolic syndrome showed markedly increased KYN/TRP ratios contrary to decreased KYN/TRP ratios in ow/ob juveniles. Abdominal fat content, characterized by age normalized waist circumference, and not body mass index, had the strongest effect for an increase of the KYN/TRP ratio in adults.ConclusionsTRP metabolism and obesity‐related immune mediated inflammation differs markedly between juveniles and adults. While childhood obesity seems to be dominated by a Th2‐driven activation, an accelerated production of Th1‐type cytokines may pave the way for later atherosclerotic endpoints.
Effectiveness of a Pharmacy Care Management Program for Veterans with Dyslipidemia
Authors: Smith Michael C. , Boldt Amy S. , Walston Cassandra M. , Zillich Alan J. 
Published: April 2013

ObjectiveTo evaluate the effectiveness of a care management program provided by clinical pharmacists for veterans with dyslipidemia.DesignRetrospective cohort design.SettingTwo primary care clinics at a Veterans Affairs Medical Center.PatientsAn intervention (IT) cohort of 213 patients referred for management of dyslipidemia by clinical pharmacists and a control cohort of 219 patients with dyslipidemia receiving usual care (UC).MethodsData were obtained from electronic medical records regarding drug therapy, lipid levels, and patient characteristics. Using multivariable regression models to adjust for baseline characteristics, the primary analyses compared mean final measured values of low‐density lipoprotein (LDL) cholesterol, total cholesterol (TC), high‐density lipoprotein (HDL) cholesterol, and triglycerides (TGs) among the IT and UC cohorts at the final follow‐up visits. Secondary analyses compared the proportion of patients achieving National Cholesterol Education Program/Third Report of the Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults (NCEP/ATPIII) concordant LDL goals and the time to achieve LDL goals between the two groups.ResultsCompared with the UC cohort, the adjusted difference in the mean final measured LDL for the IT cohort was −10.4 mg/dl (95% confidence interval [CI] −16.1 to −4.6, p < 0.001) and TC was −12.7 (95% CI −21.3 to −4.1, p=0.004). There were no significant differences in the adjusted mean final measured HDL or TGs between the two groups. The NCEP/ATPIII goal LDL was met in 80.3% of patients in the IT cohort and 65.3% of patients in the UC cohort (odds ratio [OR], 2.6; 95% CI 1.6–4.3, p<0.001). Time to achieve goal LDL was significantly shorter for the IT cohort compared with the UC cohort (risk ratio, 1.8; 95% CI 1.2–2.8, log‐rank p=0.002).ConclusionVeterans referred to a clinical pharmacist for treatment of dyslipidemia achieved significant reductions in TC and LDL. A greater proportion of patients achieved NCEP/ATPIII goal LDL, and the time to attainment of LDL goals was shorter in the pharmacist‐managed cohort, supporting a continued role for pharmacy care management in the treatment of patients with dyslipidemia.
New Concepts in Geophysical Surveying and Data Interpretation for Permafrost Terrain
Authors: Hauck Christian 
Published: April 2013

ABSTRACTThis review focuses on advances in applications of geophysical methods to permafrost terrain that have emerged in 2007–12. Improvements in the four main geophysical techniques presently used in permafrost research (i.e. electric, electromagnetic, seismic and radar methods) and new or resurrected methods for permafrost applications are discussed. Advances in geophysical monitoring and quantitative interpretation of geophysical survey results are presented, especially for ground ice and water content. Electrical resistivity is now used operationally for long‐term monitoring of ice content, as well as for short‐term process studies. Quantitative approaches to determine realistic ice and liquid water content values and their spatial and temporal variability exist, but need to be further refined to be widely applicable for geotechnical and numerical modelling purposes. Copyright © 2013 John Wiley & Sons, Ltd.