bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel wideband asymmetric hybrid antenna for WLAN/WiMAX applications
Authors: Lee Shiao‐Yu , Yu Cheng‐Chieh 
Published: February 2009

AbstractA novel wideband wireless local area network/worldwide interoperability for microwave access (WLAN/WiMAX) hybrid antenna comprised of an asymmetric rectangular patch and additional strips is presented, including both simulation and measurement results. This proposed hybrid antenna exhibits wideband performance with sufficient bandwidth to meet the requirements of WLAN in the 2.4/5.2/5.8 GHz bands and WiMAX in the 2.5/3.5/5.5 GHz bands. Measurements show that the 10 dB return loss bandwidth (VSWR < 2) reaches as much as 5.59 GHz (= 7.92 GHz − 2.33 GHz). Moreover, the antenna gains at 2.45 GHz, 3.55 GHz, and 5.85 GHz are measured to be 4.596 dBi, 3.126 dBi, and 5.42 dBi, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1055–1057, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24215
A hybrid method for shape reconstruction of dielectric objects
Authors: Tezel Necmi Serkan 
Published: February 2009

AbstractA Newton‐based Hybrid method for reconstruction of the shape of dielectric objects through the measured far‐field scattering data is given. The scattered field is represented as a single‐layer potential which leads to an ill‐posed integral equation of the first kind that is solved via Tikhonov regularization. The presented Newton‐based method combines ideas of both the iterative and decomposition methods and inherits the advantages of each of them, such as getting good reconstructions and not requiring a forward solver at each step. The numerical results show that the method yields good reconstruction. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1147–1151, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24218
Compact chip antenna applications in GPS by LTCC processing
Authors: Chung Yueh‐Ta , Sun Jwo‐Shiun , Wang Sea‐Fue , Huang Sheng‐Yi , Chiang Chuang‐Chung 
Published: February 2009

AbstractA compact chip antenna is presented by using the low‐temperature cofired ceramics processing. Because of keeping the sintering temperature under 850°C, the 8.6CaO‐47.8B2O3‐43.6SiO2 (CBS‐10) glass system is adopted. The antenna is operated in the L‐band of Global Position System, 1.575 GHz. The total volume of the chip antenna is 10 × 10 × 2 mm3, and its size is reduced down to 36% which compares to using FR4 at the same frequency. As well as the performances of the far‐field radiation patterns are approximately to omnidirectional. The experimental results are consistent with the simulations. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1017–1019, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24219
Design of a miniature broad band planar inverted F‐type antenna
Authors: Huang Jhin‐Fang , Wen Jiun‐Yu , Huang Tai‐Pin 
Published: February 2009

AbstractA broad band inverted F‐type antenna for ISM band is presented in this article. Bending method is adopted to reach miniaturization, and planar design makes it easy to fabricate. Reduced short‐circuit (RSC) plate, lower resonant frequency (LRF) for planar inverted F‐type antenna (PIFA) and inverted F‐type monopole antenna (IFMA) are applied to design a compact F antenna with the aid of a simulator, IE3D. Simulation and measurement are pretty matched and indicate that the LRF achieves −10 dB, bandwidth up to 304 MHz (12.4%) ranging from 2.332 to 2.636 GHz, and the peak gain to be 3 dBi. The RSC has a bandwidth up to 220 MHz (9%) ranging from 2.36 to 2.58 GHz, and the peak gain to be 2.5 dBi. The IFMA achieves triple bands, which are 210 MHz (8.5%) bandwidth at 2.4 GHz, and 3 GHz bandwidth ranging from 4.36 to 7.3 GHz for the second and third band applications. The measured antenna gains match to the simulation results and are about 0, 1.44, and 1.12 dBi for the 2.4, 5.2, 5.8 GHz bands frequencies, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1063–1070, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24224
An unconditionally stable wave equation PML algorithm for truncating FDTD simulation
Authors: Liang Feng , Lin Hai , Wang Gaofeng 
Published: February 2009

AbstractAn unconditionally stable (US) wave equation (WE) perfectly matched layer (PML) absorbing boundary condition is implemented for two‐dimensional (2‐D) open region finite‐difference time‐domain (FDTD) simulation by virtue of weighted Laguerre polynomial expansion. This novel PML preserves unconditional stability as well as comparative accuracy to the original wave equation PML (WEPML). Numerical examples are included to verify high accuracy and efficiency of the proposed algorithm. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1028–1032, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24233
A novel symmetrical monopole antenna for dual‐broadband operation
Authors: Lin C. , Zhang F.‐S. , Zhao G. , Zhang F. , Song Y. 
Published: February 2009

AbstractA novel dual‐band monopole antenna that consists of symmetrical G‐shaped strips and triangular branches, fed by a 50‐Ω microstrip transmission line is introduced. The designed antenna is proposed for wireless local area networks (WLAN) applications in the 2.4 and 5.2/5.8 GHz bands. The measured results explore broadband dual‐frequency operation with (10 dB) impedance bandwidths of 21.4% cenetrd at 2.575 GHz, ranging from 2.30 to 2.85 GHz, and 32.8% centerd at 6.12 GHz from 5.10 to 7.14 GHz. The omnidirectional pattern, good gain, and broad bandwidth performances over the operating bands have been obtained by the proposed antenna with relatively low profile, which is suitable for dual‐broadband wireless communication systems. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 976–979, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24235
A 24‐GHz VCO using active FET frequency doubler in 0.18‐μm CMOS technology
Authors: Chen X.‐S. , Chen Y.‐T. , Lu C.‐L. , Chuang H.‐R. 
Published: February 2009

AbstractIn this article, a 24‐GHz VCO composed of a 12‐GHz VCO and an active frequency doubler is presented. This work is implemented by using the 0.18‐μm 1P6M CMOS process. The VCO and active frequency doubler with a 1.5 V supply consume 30 mA. The phase noise of measurement is −107.5 dBc/Hz and −123.1 dBc/Hz at 1‐MHz and 10‐MHz offset, respectively. A tuning range of 2.3 GHz is achieved by using varactor. The measurement shows a good efficiency of translation of frequency doubler and the oscillator has a good figure of merit (FOM) of −180 dBc/Hz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 940–942, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24238
An EpHEMT‐based dual‐function integrated antenna for passive RFID transponders
Authors: Gómez C. , Aballo T. , García J. A. , Mediavilla A. 
Published: February 2009

AbstractIn this letter, a passive RFID transponder based on an enhancement mode pseudomorphic HEMT (EpHEMT) is proposed. Taking advantage of the slightly positive threshold voltage of this transistor technology, a dual‐function detector/mixer circuit with good RF‐to‐DC and frequency conversion efficiency has been designed. Such structure has been integrated in a conveniently designed aperture coupled patch, configuring the complete tag unit. On reception of an interrogating signal, the detector switches on the data generator circuit, being the information signal up‐converted near the interrogating frequency band through an optimized drain mixing configuration. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1117–1119, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24240
A novel Ku band left‐handed media antenna radome
Authors: Wu Wei‐Wei , Huang Jing‐Jian , Yuan Nai‐Chang 
Published: February 2009

AbstractAntennas used in radar are expected to have high gain and low sidelobe. To achieve this end, this article presents a novel Ku band planar radome made by left‐handed materials, and then placed in front of an Archimedean spiral antenna element. The properties of the LHMs plane radomes are studied firstly, and the frequency band when the indexes of refraction of the LHMs plane radomes are negative is selected. Several LHMs planar radomes are developed. The gain of the antenna is tested on condition of several different parameters, such as the number of LHMs plane radomes, the distance between the antenna and these LHMs plane radomes, and the distance between two neighbor LHMs plane radomes. The beam is focused by the LHMs plane radomes. And comparing with the pattern of the antenna without these radomes, 5 dB more gain can be obtained by using LHMs planes radome. The electric level of the sidelobe is about −13.5 dB. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1043–1046, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24243
A tunable narrow‐linewidth Er‐doped fiber ring laser based on tunable fiber Bragg gratings
Authors: Liu Peng , Yan Feng Ping , Li Jian , Wang Lin , Gong Tao Rong , Tao Pei Lin 
Published: February 2009

AbstractA tunable narrow‐linewidth Er‐doped fiber ring laser using tunable fiber Bragger gratings (TFBGs) is proposed and demonstrated. The TFBG is fabricated with a strain‐induced uniform FBG, which acts as an excellent reflecting mirror. By putting longitudinal strain to the TFBG, an approximately continuous tunable lasing output is obtained, the wavelength tunable range covers 8.00 nm (from 1543.5643 to 1551.5108 nm), and the tunable resolution is 1.92 nm/mm. A repeated testing result shows that the linewidth of the laser is stable and less than 0.01 nm, and the side‐mode suppression ratio is better than 50 dB. Moreover, an array waveguide grating is utilized for wavelength preselecting, and a 50‐km transmission performance of the proposed laser is tested experimentally under a 10 Gb/s modulation rate. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1005–1010, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24245
Analysis and design of novel dual‐band branch line coupler with patterned ground plane
Authors: You Changjiang , Zhu Xiaowei 
Published: February 2009

AbstractThis article presents the novel dual‐band planar 90° branch line coupler with patterned ground plane, sometimes referred to as ‘defected ground structure.’ In the new layout, two cross coupling branches are added to the conventional branch line coupler. The additional branches make the design of dual‐band coupler at two arbitrary bands more flexible. Moreover, the used patterned ground plane makes an implementation of high impedance microstrip line easy and increases the electrical length of microstrip line. The basic principles of the novel coupler are analyzed and the design procedure is presented. For method validation, a dual‐band microstrip coupler operating at 2.1 GHz and 3.6 GHz was designed, tested, and analyzed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1000–1005, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24246
Analysis of the small slot‐loaded elliptical patch antenna with a band‐notched for UWB applications
Authors: Peng Lin , Ruan Chengli , Yin Xuncai 
Published: February 2009

AbstractA small slot‐loaded elliptical antenna with a band‐notched for ultra wide‐band (UWB) applications is presented in this article. Printed on a dielectric substrate with relative permittivity of 4.4, thickness of 1 mm, and fed by a 50 Ω microstrip line, the proposed antenna satisfies the UWB bandwidth requirement of 3.1–10.6 GHz. A slot is used to reject the frequency band (5.15–5.825 GHz) limited by IEEE802.11a. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 973–976, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24247
A compact dual‐band modified T‐shaped CPW‐fed monopole antenna
Authors: Sujith R. , Deepu V. , Laila D. , Aanandan C. K. , Vasudevan K. , Mohanan P. 
Published: February 2009

AbstractA compact, dual band coplanar waveguide fed modified T‐shaped uniplanar antenna is presented. The antenna has resonances at 1.77 and 5.54 GHz with a wide band from 1.47–1.97 GHz and from 5.13–6.48 GHz with an impedance bandwidth of 34% and 26%, respectively. Also the antenna has an average gain of 3 dBi in lower band and 3.5 dBi in higher band with an average efficiency of 90%. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 937–939, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24249
Design techniques applied to partially reflective surface antenna
Authors: Chang The Nan , Chen Chun‐Hua 
Published: February 2009

AbstractPartially reflective surface antenna (PRSA) contains a highly reflective sheet and a perfect conductor (or ground plane) separated by a half wavelength. Usually, the reflective sheet is constructed by etching uniformly spaced patch elements on a supporting dielectric. In this article, an inhomogeneous spaced partial reflective sheet with an enlarged dielectric rim is investigated. We found that efficiency of the antenna can be optimized with a suitable dielectric size. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1112–1116, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24251
Subsurface imaging, FDTD‐based simulations and alternative scan/processing approaches
Authors: Karpat E. , Çakır M. , Sevgi L. 
Published: February 2009

AbstractNondestructive and noncontacting subsurface imaging is discussed. A finite‐difference time‐domain (FDTD) based virtual tool is developed to create various imaging scenarios and to generate synthetic scattering data. Matlab‐based imaging algorithms are developed to process recorded FDTD data and to reconstruct objects. Different contour synthetic aperture type scanning configurations and reconstruction techniques are applied and their effects on imaging are reviewed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1070–1075, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24253
Erratum: Application of IE‐FFT with combined field integral equation to electrically large scattering problems
Authors: An Xiang , Lü Zhi‐Qing 
Published: February 2009

AbstractOriginally published in Microwave Opt Technol Lett 50: 2561–2566, 2008. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1153, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24259
Design a new structure 2.4 GHz/5.2 GHz dual‐band bandpass filters on the MgTa1.5Nb0.5O6ceramic
Authors: Yang Cheng‐Fu , Yang Hung‐Chi , Cheng Chien‐Min , Chen Kai‐Huang , Chen Ying‐Chung 
Published: February 2009

AbstractIn this article, a λ/2 U‐shaped hairpin resonator was contained in a modified end‐coupled microstrip line. The increase of the sizes of U‐shaped hairpin resonator and modified end‐coupled microstrip line had no influence on the lower operating frequency and would shift the upper operating frequency to lower values. After finding the best designed parameters, a miniature dual‐band microstrip bandpass filter with three transmission zeros generated in the stop‐bands was developed on the MgTa1.5Nb0.5O6microwave dielectric ceramic substrates. The dual‐band filter had the central frequencies of 2.45 and 5.2 GHz and was suitable for the applications in the modern WLAN communication. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1085–1087, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24264
A printed ultra‐wideband hexagon monopole antenna with WLAN band‐notched designs for wireless communication
Authors: Li Dong , Quan Shaohui , Wang Zhengpeng 
Published: February 2009

AbstractA planar monopole antenna is designed for ultra‐wideband applications. A novel feeding structure is proposed to improve the impedance bandwidth. Promising performances are achieved, including wide impedance bandwidth, flat gain, and omnidirectional radiation patterns. Two kinds of band‐notched structure extended from the proposed antenna are designed and verified. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 899–902, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24265
Electromagnetic scattering from a dielectric cylinder and the method of lines
Authors: Hooshyar M. A. 
Published: February 2009

AbstractA modified method of lines is developed for solving electromagnetic scattering problems, when TM plane waves are incident on cylindrical structures with dielectric properties that are function of two spatial directions. Numerical performance of the proposed method are examined and found to be very satisfactory. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1046–1049, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24266
A robust protocol for regional evaluation of methacholine challenge in mouse models of allergic asthma using hyperpolarized 3He MRI
Authors: Thomas Abraham C. , Potts Erin N. , Chen Ben T. , Slipetz Deborah M. , Foster W. Michael , Driehuys Bastiaan 
Published: February 2009

AbstractHyperpolarized (HP) 3He magnetic resonance imaging has been recently used to produce high‐resolution images of pulmonary ventilation after methacholine (MCh) challenge in mouse models of allergic inflammation. This capability presents an opportunity to gain new insights about these models and to more sensitively evaluate new drug treatments in the pre‐clinical setting. In the current study, we present our initial experience using two‐dimensional (2D), time‐resolved 3He MRI of MCh challenge‐induced airways hyperreactivity (AHR) to compare ovalbumin‐sensitized and challenged (N = 8) mice to controls (N = 8). Imaging demonstrated that ovalbumin‐sensitized and challenged animals exhibited many large ventilation defects even prior to MCh challenge (four out of eight) compared to no defects in the control animals. Additionally, the ovalbumin‐sensitized and challenged animals experienced a greater number of ventilation defects (4.5 ± 0.4) following MCh infusion than did controls (3.3 ± 0.6). However, due to variability in MCh delivery that was specific to the small animal MRI environment, the difference in mean defect number was not statistically significant. These findings are reviewed in detail and a comprehensive solution to the variability problem is presented that has greatly enhanced the magnitude and reproducibility of the MCh response. This has permitted us to develop a new imaging protocol consisting of a baseline 3D image, a time‐resolved 2D series during MCh challenge, and a post‐MCh 3D image that reveals persistent ventilation defects. Copyright © 2009 John Wiley & Sons, Ltd.
Conducting polyaniline‐titanium dioxide nanocomposites prepared by inverted emulsion polymerization
Authors: Karim Mohammad Rezaul , Lee Hyun Woo , Cheong In Woo , Park Sung Min , Oh Weontae , Yeum Jeong Hyun 
Published: February 2009

AbstractConducting polyaniline (PAni)‐titanium dioxide (TiO2) nanocomposites have been synthesized by the inverted emulsion polymerization method. Aqueous mixtures of aniline, a free‐radical oxidant, and/or TiO2 nanoparticles (∼25 nm in diameter; mixture of anatase and rutile) are utilized to synthesize the hybrid nanocomposites. The polymerization is carried out in an organic solvent (chloroform, CHCl3) in the presence of a protonic acid (hydrochloric acid, HCl) as a dopant and an emulsifier (cetyl trimethylammonium bromide). The resultant PAni‐TiO2 nanocomposites are characterized with their structural, morphological, conducting, and optical properties. SEM and TEM images represent the PAni‐TiO2 nanocomposites with the diameter range of 50–200 nm. Electrical conductivities are checked by standard four‐point probes method and found to be 0.38 S/cm for bulk PAni and 0.11 S/cm for PAni‐TiO2 nanocomposites. UV–visible absorption shows two electronic bands at about 320 and 596 nm for bulk PAni and the blue‐shifted bands with the intensity changes due to the formation of PAni‐TiO2 composites. Thermogravimetric analysis reveals that the composites have a higher degradation temperature than the PAni alone. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers
Effect of annealing on structural and optical properties of polypyrrole doped with different acids
Authors: Saxena Rashmi , Sharma Kananbala , Saxena N.S. , Sharma T.P. 
Published: February 2009

AbstractPolypyrrole (pure) and polypyrrole doped with different protonic acids (HCl and H3PO4) have been synthesized using NaOH as reducing agent in aqueous HCl medium and ammonium persulphate (APS) as an oxidant, respectively. These pure and doped samples were named as S1, S2, and S3 for further investigations. These pure and doped samples were annealed at 200oC for 4 hr. The amorphous nature of these annealed and as‐prepared polypyrrole samples was confirmed by XRD. FTIR spectra and SEM images of all the samples were taken at room temperature, which indicate: significant change in annealed samples. To calculate the energy band gap of all the samples, the absorption spectra were recorded by USB‐2000 spectrophotometer at room temperature in the wavelength range 300–800 nm. From the analysis of absorption spectra, optical band gap of as‐prepared samples (S1–S3) was determined to be 2.64, 2.43, and 2.29 eV, respectively and for annealed samples A1–A3 values obtained were 2.30, 2.25, and 2.17 eV. POLYM. COMPOS., 2009. © 2009 Society of Plastics Engineers
Privileged communication in the school psychologist–client relationship
Authors: Jacob Susan , Powers Katie E. 
Published: February 2009

AbstractIn the years since the 1996 Supreme Court Jaffee v. Redmond decision, many states broadened the scope of their laws governing privilege to include non‐doctoral school psychologists. This article addresses the meaning of the term privileged communication and identifies common exceptions to privilege. Findings from a computerized search of the status of privileged communication between school psychologists and their clients in all states are reported. Implications of privilege communication laws for the delivery of school psychological services are discussed. © 2009 Wiley Periodicals, Inc.
Intermittent gaseous bowel distention: Atypical sign of congenital tracheoesophageal fistula
Authors: Gardella Chiara , Tomà Paolo , Sacco Oliviero , Girosi Donata , Panigada Serena , Battistini Elena , Mattioli Girolamo , Jasonni Vincenzo , Rossi Giovanni A. 
Published: February 2009

AbstractThree girls, 5‐, 9‐, and 15‐year‐old, were evaluated for recurrent airway infections and pneumonia. Chest X‐rays, which included the upper portion of the abdomen, showed marked gaseous bowels distention, while computed tomography scans of the chest demonstrated the presence of tracheoesophageal fistula (TEF), confirmed by fiberoptic bronchoscopy. Abdominal gaseous distension, a known possible clinical manifestation of TEF in the neonatal period generated by airflow through the fistula into the oesophagus, has not been reported as a clue to the diagnosis in older children. When detected in patients with recurrent respiratory infection, should raise the suspicion of unrecognized TEF. Pediatr Pulmonol. 2009; 44:244–248. © 2009 Wiley‐Liss, Inc.