bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis of Poly(acrylic acid) Nanogels and Application in Loading and Release of an Oligothiophene Fluorophore and Its Bovine Serum Albumin Conjugate
Authors: Argentiere Simona , Blasi Laura , Ciccarella Giuseppe , Barbarella Giovanna , Cingolani Roberto , Gigli Giuseppe 
Published: July 2009

AbstractSummary: Nanometer‐sized poly(acrylic acid) (PAA) hydrogels were synthesized by emulsion polymerization of methyl acrylate and subsequent acid hydrolysis, and their pH‐dependent swelling behaviour was studied by dynamic light scattering. To determine the suitability of PAA nanogels as pH‐sensitive carriers for biomedical applications, loading and release of an oligothiophene fluorophore and its albumin conjugate onto the PAA nanogels were investigated as a function of pH by absorption and photoluminescence measurements. It was observed that loading and release processes of both the oligothiophene and its conjugate could be controlled by changing pH of their solutions.
Morphological Changes Induced by Addition of Polystyrene to Dextran‐Polystyrene Block Copolymer Solutions
Authors: le Meins Jean‐François , Houg Clément , Borsali Redouane , Taton Daniel , Gnanou Yves 
Published: July 2009

AbstractSummary: In this work we discuss the self‐assembling behaviour in solution of a block copolymer, dextran‐block‐polystyrene, in the presence of homopolystyrene (PS) which allows to decrease the hydrophilic fraction f of the mixture. Dynamic and static light scattering experiments have been carried out in water‐miscible solvents (DMSO and THF) to probe the formation of supramolecular structures. Results have been compared to those obtained with a block copolymer solution having the same hydrophilic fraction f. Interestingly, the morphology of the self‐assembled structures was the same for a given value of f.
Erratum: Solution of electromagnetic scattering problems by transformation into high‐order impedance boundary condition
Authors: Tezel Necmi Serkan 
Published: July 2009

AbstractOriginally published Microwave Opt Technol Lett 50: 832–836, 2008. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2525, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24590
Erratum: Bow‐tie antenna using high‐impedance ground plane
Authors: Lee Yi‐Chieh , Sun Jwo‐Shiun 
Published: July 2009

AbstractOriginally published Microwave Opt Technol Lett 50: 2928–2931, 2008. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2525, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24591
On‐body radio channel modeling for different human body models using FDTD techniques
Authors: Terchoune Hanae , Lautru David , Gati Azeddine , Carrasco Albert Cortel , Wong Man Faï , Wiart Joe , Hanna Victor Fouad 
Published: July 2009

AbstractThis articlepresents an on‐body radio channel modeling at 900MHz using the FDTD technique. The modification of antennas parameters when they are close to the body or directly on the body is analyzed. Then, the influence of the morphology on the propagation is studied; SAR and channel parameters are also extracted. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2498–2501, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24592
A composite antenna with wide circularly polarized beamwidth
Authors: Shi Lei , Sun Houjun , Lu Xin 
Published: July 2009

AbstractA circularly polarized (CP) composite antenna is studied in this article. The antenna unit is composed of a CP curl antenna and a CP omni‐directional antenna with three pairs of tilted parasitic elements. Reasonable agreement between simulation and measurement is obtained. The proposed antenna has a 10‐dB impedance bandwidth (S11 < −10 dB) of 35% and a 3‐dB axial ratio (AR) bandwidth of 20%. The composite antenna and the reference antenna are compared in this article. The composite antenna can obtain a 3‐dB power gain beamwidth of 110° and 3‐dB AR beamwidth of 120°, when compared with those of the reference antenna with 95° and 95°, respectively. The characteristics of the composite antenna are also investigated. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2461–2464, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24594
Microstrip bandpass filter design using triangular open loop resonators with improved cross‐coupled structure
Authors: Liu Haiwen , Tan Mingtao 
Published: July 2009

AbstractIn this letter, a highly selective microstrip bandpass filter using triangular open‐loop resonators with improved cross‐coupled structure is designed, fabricated, and measured. The new cross coupling structure is implemented by inserting two L‐shaped stubs into the triangular open‐loop resonators. A good agreement is achieved between simulated and measured results. Measurements are given to verify that a passband from 5.1 to 5.5 GHz with the insertion loss less than 1.0 dB and return loss more than 20 dB is obtained. There are two transmission zeros on both sides of the passband which lead to higher selectivity for the passband. In addition, two extra transmission zeros are observed obviously and located at about 7.0 GHz and 9.0 GHz, respectively, for high out‐of‐band rejection. The filter has a compact size of 10 mm × 6 mm which amounts to about 0.3 λg × 0.2 λg. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2346–2348, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24599
Study of the passive microwave RFID tag range using distance‐dependent reflection coefficient over multipath channel
Authors: Wei Fu , Jianguo Ma 
Published: July 2009

AbstractThe distance‐dependent reflection coefficients are investigated based on a multi‐ray model at microwave frequency bands. Tag range of passive microwave radio‐frequency identification (RFID) systems is then calculated taking into account the tagged object material characteristic. Obtained values are verified through the precise simulations based on a 3‐D physical finite element model. The results shown that the proposed method provides a good agreement than that obtained by existing methods. The analytical method can be used for the empirical tag range value to avoid reader collision while ensuring system reliability. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2266–2268, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24602
A novel miniaturized frequency selective surface with excellent center frequency stability
Authors: Yang Hong‐Yu , Gong Shu‐Xi , Zhang Peng‐Fei , Zha Feng‐Tao , Ling Jin 
Published: July 2009

AbstractA novel miniaturized frequency selective surface is proposed. The size reduction is achieved by bending the edge of square loop aperture into the inner space to lengthen the resonant length. Compared with conventional square loop aperture frequency selective surface (FSS), the area of this miniaturized‐element is reduced by 78% at the same operation frequency of 2.9 GHz. Both theoretical and experimental investigations are carried out. It is observed that the miniaturized FSS presents excellent center frequency stability with the increase of the incident angle. This proposed FSS can be a good candidate for FSS radomes which present large incident angle to the coming wave. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2513–2516, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24604
A three‐in‐one diversity antenna system for 5 GHz WLAN applications
Authors: Su Saou‐Wen 
Published: July 2009

AbstractA novel, three‐in‐one antenna system suitable for WLAN operation in the 5 GHz band is presented. The design is based upon incorporating one slot and two dipole antennas into a compact multiantenna system that has comparable dimensions of a single mobile‐unit antenna element. The three antennas are arranged parallel to each other with the two dipoles set on the right and left sides of the slot respectively. With this arrangement, not only can compact integration of three individual antennas be realized, pattern diversity and polarization diversity are also obtained. A design prototype has been constructed and tested. The results show that the coupling or the antenna port isolation is below −20 dB and good radiation characteristics have been observed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2477–2481, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24606
Frequency response of fiber ring resonator and its application in DFB laser wavelength variation measurement
Authors: Chen Wei , Zhu Ning Hua , Ren Min , Xie Liang 
Published: July 2009

AbstractFrequency response of a fiber ring resonator (FRR) composed of an ordinary optical coupler and a segment of optical fiber is theoretically and experimentally investigated. The frequency response equation based on small‐signal modulation is derived and studied in detail. It is shown that the shape of the frequency response curve is very sensitive to the wavelength; as a result, the FRR can be applied to measure the wavelength of a lightwave source with high resolution. With this method, we demonstrate the measurement of tiny changes of wavelength of a DFB laser. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2444–2448, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24608
Hetero junction bipolar transistor‐based cascode amplifier with high‐frequency loss compensation network
Authors: Wang Rong , Gao Huai , Chatchaikarn Aroonchat , Li G. P. 
Published: July 2009

AbstractPerformance analysis and design methodology of an HBT cascode amplifier with series RLC loss compensation network are reported in this article. The series RLC loss compensation network enhances the gain‐bandwidth product of the cascode amplifier. For comparison, cascode amplifiers with and without RLC loss compensation network are designed and fabricated on 2 μm InGaP/GaAs HBT technology. The measurement results show that the gain‐bandwidth product for the amplifier with loss compensation network is increased by a factor of 4, compared with the conventional amplifier. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2410–2413, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24611
Analysis and design of stub bandpass filters using tapped‐line geometry
Authors: Yun Tae‐Soon , Yoon Yong‐Kyu , Lee Byungje , Choi Jin‐Joo , Kim Jin‐Young , Lee Jong‐Chul 
Published: July 2009

AbstractA simplified mathematical design method for tapped‐line geometry is presented and the stub bandpass filters (BPFs) of λg/4 and λg/2 stubs with a center frequency of 5.8 GHz and a bandwidth of 5% are successfully designed, fabricated, and characterized using this approach. Design parameters for the tapped‐line geometry of the filter prototypes are obtained using input (output) admittance toward source (load), where the open‐stub and the additional transmission‐line with a negative electrical length are taken into account for filter implementation. The electrical lengths of the stubs and lines are functions of the line admittance and J‐inverter. The filters are implemented on a RT‐duroid substrate and the results from modeling and measurement show good agreement with each other. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2338–2341, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24615
Second‐order statistics of measured on‐body diversity channels
Authors: Khan Imdad , Nechayev Y. I. , Hall Peter S. 
Published: July 2009

AbstractThe fading severity, and the improvement offered by diversity to reduce it, is presented in the context of the second‐order statistics for on‐body belt‐head channel. Average LCR and AFD values are presented and compared at three frequencies and also for the three antennas for branch and combined signals. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2335–2337, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24621
A compact rectangular dielectric resonator antenna for UWB wireless communication systems
Authors: Aoutoul Mohssin , El‐Mrabet Otman , Essaaidi Mohamed , El Moussaoui Ahmed 
Published: July 2009

AbstractA compact rectangular dielectric resonator antenna (DRA) is presented for ultra wide band communication systems. Ansoft HFSS 3D electromagnetic solver is used for the design optimization and measurement results are also provided. The proposed antenna has a low profile (∼3), a small size, and a low permittivity constant (10.2). An impedance bandwidth about 46% (from 6.9 to 11 GHz) was achieved making this antenna suitable for UWB applications. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2281–2286, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24623
Erratum: Engineering the phase speed of surface plasmon wave at the planar interface of a metal and a chiral sculptured thin film
Authors: Lakhtakia Akhlesh , Polo John A. 
Published: July 2009

AbstractOriginally published Microwave Opt Technol Lett 50:1966–1970, 2008. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2524, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24663
Design of a quad‐band antenna for wireless communication
Authors: Hong Seokjin , Chung Kyungho , Kim Jeongpyo , Choi Jaehoon 
Published: July 2009

AbstractA multiband slot antenna with two parasitic radiators for GSM900/DCS1900/WiMAX/WLAN wireless communication services is introduced. The proposed antenna is small in size (40 mm × 40 mm × 1.6 mm) and has a simple structure. The bandwidth and resonant frequencies of the antenna are controlled by the electromagnetic coupling among radiators. Details of the antenna design are described and the effects of design parameters on antenna performance are investigated. The experimental results of the constructed prototype are presented and discussed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2277–2281, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24634
Compact tapped stepped impedance open stub dual‐band bandstop filters with sharp rejection characteristics
Authors: Velidi Vamsi Krishna , Guntupalli Ajaybabu , Sanyal Subrata 
Published: July 2009

AbstractIn this article, a novel transmission line (TL) shunt stepped impedance open stub configuration has been presented to design a dual‐band bandstop filter with impedance controlled center frequencies and bandwidths. Design guidelines are derived using lossless TL model. The high‐impedance lines required for TL sections facilitate convenient meandering that makes the geometry compact. To validate theoretical predictions, a prototype filter operating at two bands 1.5 and 3.4 GHz has been fabricated. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2274–2277, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24635
A wideband circular polarization antenna for portable INMARSAT BGAN terminal applications
Authors: Fu Shi‐Qiang , Fang Shao‐Jun , Wang Zhong‐Bao , Li Xiao‐Ming 
Published: July 2009

AbstractA low profile, wideband, and portable antenna has been designed and fabricated for Inmarsat broadband global area network (BGAN) land mobile terminal applications. The purpose of the antenna was to provide a low‐cost and easy‐fabricated solution with wide bandwidth and high performance. The proposed antenna is composed of the stacked corner‐truncated patches with sequential rotation oblique feed and a serial feeding network. Good antenna characteristics are achieved over the BGAN operating bands. The measurement results for return loss, gain, axial ratio, and radiation pattern confirm the integrity of the simulation results. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2354–2357, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24643
Novel ultra wideband filter using three coupled lines and short stubs
Authors: Li Qi , Liang Chang‐Hong , Lai Xin , Chen Jian‐Zhong 
Published: July 2009

AbstractA novel compact ultra‐wideband bandpass filter is proposed to meet Federal Communications Commission's spectrum mask. Shunt short‐circuited stubs and the parallel coupled lines are used to achieve a fraction passband from 3.1 GHz to 10.6 GHz. Three interdigital edge coupled microstrip lines are used for coupling enhancement. By employing short‐circuited stubs, this filter significantly improves the selectivity and out‐of‐band characteristics. For verification, the proposed filter is designed, simulated, and fabricated with good agreement. The design of the filter is simple, and it shows good frequency response. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2272–2274, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24646
Log periodic bandstop filter
Authors: Sithole E. S. , Malherbe J. A. G. 
Published: July 2009

AbstractMost conventional transmission line filters are commensurate structures, with all elements that contribute to the filter performance of equal length. In this article, a structure is described that makes use of a series of elements that vary in length and spacing according to a logarithmic function; this results in a series of transmission zeros at real frequencies. It is shown that excellent filtering performance can be obtained from a relatively simple construction. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2418–2420, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24652
Broadband E‐shaped monopole antenna for USB dongle application
Authors: Jung Jinwoo , Lee Hyeonjin , Lim Yeongseog 
Published: July 2009

AbstractA broadband E‐shaped monopole antenna for universal serial bus (USB) dongle applications is demonstrated experimentally and numerically. According to the experimental results, the operating mode has an impedance bandwidth of approximately 39.8% (1.83–2.74 GHz) that covers the UMTS, WiBro, WLAN, and S‐DMB bands, and omnidirectional radiation patterns were obtained. It is suitable for application to a USB dongle with its relatively low profile. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2387–2390, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24654
A transmit/receive twin‐horn feed for spinning remote sensing reflector antennas
Authors: Xu Shenheng , Farhad Razavi S. , Rahmat‐Samii Yahya 
Published: July 2009

AbstractA gravitationally balanced reflector antenna with minimized spun inertia has recently been considered for remote sensing applications. The back‐to‐back reflector antenna structure is used to generate two off‐nadir scanned beams. In particular, to overcome the large azimuth displacement between Tx/Rx events due to the high spinning rate and high orbit altitude of the antenna, a customized integrated twin‐horn feed with partially overlapped corrugation is designed to transmit and receive signals, respectively. Simulation and measurement results of the twin‐horn feed agree very well. The simulated far‐field pattern of the reflector antenna matches well with the design goals. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2505–2510, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24656
Measurement of electric power using an optical fiber grating
Authors: Cheng Chin‐Hsing , Lin Li‐Min , Liu Wen‐Fung 
Published: July 2009

AbstractThere is increasing motivation to develop sensors and actuators to manage domestic electric power consumption. This article demonstrates an optical fiber sensor using a superstructure fiber grating (SFG) to measure electric power consumption. The sensor head is based on SFG encapsulated in a polymer‐half‐field metal cylinder embedded a magnetic material at measure point. The operating mechanism is that the sensor can be attracted by the induced magnetic force created by the electric power in the solenoid along one radial direction only, and responds to an axial force on the magnetic rod attached to the round plate, creating an axial attraction on the SFG. Therefore, variations in attractive force cause center‐wavelength variations in SFB and long‐period grating acts as an edge filter converting strain‐induced wavelength variation into optical power measurement. Thus, the sensor can be used to measure electric power without the use of power meter. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2438–2441, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24660
Microwave conductivity measurements of carbon veil by two different methods
Authors: Karimkashi Shaya , Kajfez Darko , Kishk Ahmed A. , Vaidya Shalmalee 
Published: July 2009

AbstractTwo measurement techniques to measure the conductivity of carbon veil sample, a new composite conductive material, are presented: the parallel plate cavity resonator method and the waveguide measurement method. Comparison between results obtained by these two methods is provided and an uncertainty analysis performed for both measurement methods. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2435–2438, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24661
Small‐size wireless wide area network loop chip antenna for clamshell mobile phone with hearing‐aid compatibility
Authors: Li Wei‐Yu , Wong Kin‐Lu 
Published: July 2009

AbstractA loop chip antenna with an FR4 chip base suitable for clamshell mobile phone application to achieve wireless wide area network operation and hearing‐aid compatibility (HAC) is presented. The loop chip antenna is formed by a loop strip excited by a capacitively coupled feed, all printed on the surfaces of the FR4 chip base to achieve a small size of 1.35 cm3only. Two resonant loop paths are provided by the antenna and each loop path can generate its 0.5λ and 1.0λ resonant modes with good impedance matching. The excited loop resonant modes are formed into two wide operating bands for the antenna to cover GSM850/900 and GSM1800/1900/UMTS operations for both the open (talk) and closed (idle) states of the clamshell mobile phone. Furthermore, the loop antenna also excites small surface currents on the two ground planes of the clamshell mobile phone. In this case, weak near‐field EM fields in the vicinity of the mobile phone can be generated. Results show that the strengths of the near‐field E‐field and H‐field fall in the M3 or M4 Category, making the clamshell mobile phone with the proposed antenna to be an HAC communication device. The obtained specific absorption rate values in 1‐g and 10‐g head tissues also meet the limit of 1.6 and 2.0 W/kg, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2327–2335, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24665
All optical multi‐tap microwave filter with high sidelobe suppression using peak profile of ASE and one multiwavelength FBG
Authors: Xia Li , Aditya S. , Shum P. , Zhou Junqiang 
Published: July 2009

AbstractA new all optical 10‐tap microwave filter is proposed using a broadband amplified spontaneous emission (ASE) light source and a single specially designed multiwavelength FBG. Measured results show that the sidelobe suppression is larger than 20 dB. The filter response is insensitive to the polarization state of light. This technique enables one to obtain a simple and low cost photonic microwave filter with a stable response. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2522–2524, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24666