bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ultra‐wideband bandpass filter using simplified left‐handed transmission line structure
Authors: Han Wenjia , Feng Yijun 
Published: August 2008

AbstractA novel ultra‐wideband bandpass filter has been proposed based on a simplified left‐handed transmission line (LH‐TL) structure. The main design procedure is to define and realize the LH‐TL unit cell according to the desired pass band. The filter has been realized in theory, verified by both full‐wave electromagnetic simulation and microwave circuit simulation, and confirmed by the measurement with a return loss higher than 12 dB, and the group delay about 0.25 ns over the central band with variation of 0.2 ns. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2758–2762, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23789
Oversize rectangular microstrip patch with higher‐order mode suppression using multifeed network
Authors: Chiu L. , Xue Q. 
Published: August 2008

AbstractAn oversize microstrip patch antenna using multifeed has been proposed. By employing 1‐to‐8 in phase power divider, the antenna has been excited using edge feeds and resonates at fundamental mode. The proposed patch antenna is designed for high antenna gain of 10.9 dBi at 5.8 GHz. The occupancy area of proposed antenna is 34% smaller than that of conventional 8‐element microstrip patch antenna array. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2749–2751, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23792
Microstrip ring resonator filter enabling enhanced sideband suppression
Authors: Kyoung Un‐Hwan , Kim Gun‐Duk , Lee Sang‐Shin , Eo Yun‐Seong 
Published: August 2008

AbstractA microstrip filter based on a single‐ring bandpass section integrated with a band‐trimming section incorporating two cascaded rings was demonstrated featuring enhanced sideband suppression. The stop‐band for the input bandpass section could be selectively eliminated via the proposed band‐tailoring section without causing any excessive loss, thereby improving the overall transmission of the device with regard to higher suppression, sharper roll‐off, and narrower bandwidth. For the completed device with the center frequency at 4 GHz, the suppression ratio was increased by −8 dB, the 3‐dB bandwidth was reduced from 98 MHz to 48 MHz with negligible excessive loss, and the filter quality factor was elevated by about 105%. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2866–2869, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23795
Effect of AlN film thickness on photo/dark currents of MSM UV photodetector
Authors: Yang Ru‐Yuan , Hsiung Chin‐Min , Chen Hsuan‐Hsu , Wu Hung‐Wei , Shih Ming‐Chang 
Published: August 2008

AbstractIn this article, we have successfully fabricated the metal‐semi‐conductor‐metal (MSM) UV photodetector using the aluminum nitride‐based (AlN) film as an active layer grown on p‐type Si (100) by a dc sputtering deposition. Effect of AlN thickness of 500, 1500, and 2500 nm on the surface morphology of the AlN film and photo/dark currents of the MSM photodetector is investigated. With increase of the AlN thickness, XRD result shows the crystallization of AlN film increases. The device can be extensively used in solar‐blind UV applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2863–2866, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23796
Dual‐band monopole antenna with L‐shaped strips for 2.4/5 GHz WLAN applications
Authors: Gu Jian‐Hui , Zhong Shun‐Shi , Xue Ling‐Long , Sun Zhu 
Published: August 2008

AbstractA novel design of dual‐band monopole antenna fed by a coplanar waveguide (CPW) for wireless local area network (WLAN) applications is presented. By using dual L‐shaped strips, the impedance bandwidth of 5 GHz band is significantly increased. The measured impedance bandwidth for −10 dB return loss is from 2.28 to 2.70 GHz (16.9%) and from 4.52 to 6.28 GHz (32.9%), covering the 2.4/5 GHz WLAN operating bands. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2830–2833, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23797
Miniaturized compound spiral slot antenna
Authors: Yu‐Xiao Zhu , Shun‐Shi Zhong , Sai‐Qing Xu 
Published: August 2008

AbstractThis article introduces a miniaturized compound spiral slot antenna with a wideband balun and a back cavity. The simulated and experimental results show that the proposed antenna presents good circular polarization and wideband properties. Its measured return loss is less than −10 dB in the frequency range 0.75 to 8 GHz (10.7:1) and the axial ratio is less than 3.5 dB in the range 0.95 to 8 GHz. Comparing with the conventional spiral antenna, the proposed antenna diameter is only one fourth of that of the former, therefore the antenna size is significantly reduced. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2799–2801, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23801
The forbidden bandgap characteristic of EBG structures
Authors: Steven Yang Shing‐Lung , Kishk Ahmed A. , Lee Kai‐Fong 
Published: August 2008

AbstractThe bandgap characteristics of several electromagnetic bandgap (EBG) structures are compared, and parametric studies of a wideband uniplanar compact photonic bandgap (UC‐PBG) structure are carried out. It has been presented that the bandgap bandwidth of the mushroom type EBG structure increases when a lower dielectric constant substrate is used or when a larger substrate thickness is used. However, for the UC‐PBG structures, which do not have shorting vias, the bandgap characteristic does not follow the trend as it is in the EBG structure with shorting via. Moreover, it is demonstrated that the bandgap frequency varies with the dielectric constant of the substrate, but the bandgap bandwidth does not have particular trend with the dielectric constant of the substrate. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2965–2967, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23804
Biocompatibility study of hydroxyapatite‐chitosan composite for medical applications at microwave frequencies
Authors: Augustine Robin , Kalappura Ullas G. , Mathew K. T. 
Published: August 2008

AbstractHydroxyapatite (HAp, Ca10(PO4)6(OH)2) bioceramic and chitosan (poly [(β‐1‐4) D‐glucosamine]) biopolymer show good biocompatibility in vivo. They have biological origin and show excellent interactions with microwave. Microwave study of HAp made using different drying techniques and their composites with chitosan in the ISM band is presented. Pastes are made using HAp and chitosan with different ratios of mixing. The dielectric properties of this composites match with that of human fat, collagen tissues. Some of the compositions exhibit dielectric property close to that of natural bone. This makes them more biocompatible and better substitutes for natural bone. Thus composite bioceramics can be considered as phantom model constituents for imaging purposes. Their dielectric properties prove that they are biocompatible. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2931–2934, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23806
Ultrathin planar inverted‐F antenna for multistandard handsets
Authors: Bhatti Rashid A. , Im Yun‐Taek , Choi Jung‐Hwan , Manh Tuan D. , Park Seong‐Ook 
Published: August 2008

AbstractA compact multiband internal antenna has been proposed for multistandard personal communication handsets. The antenna simultaneously covers various frequency bands such as GSM, DCS, PCS, UMTS, WiBro, Bluetooth, S‐DMB, and WLAN. Total volume of the antenna is 0.78 cm3 (2.6 cm × 1.5 cm × 0.2 cm) that makes it attractive for multiband slim handsets. Measured performances of the prototype antenna are acceptable at all the targeted frequency bands. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2894–2897, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23808
Retracted: 488 nm ultraviolet light generated by VECSEL and V‐cavity second‐harmonic generation using lithium triborate
Authors: Du Shisen , Kaneda Yushi , Yarborough Mike 
Published: August 2008

AbstractThe following article from Microwave and Optical Technology Letters, "488 Nm Ultraviolet Light Generated By VECSEL And V‐Cavity Second‐Harmonic Generation Using Lithium Triborate," published online on August 30, 2008 and in print in November 2008 in Wiley InterScience (www.interscience.wiley.com), has been retracted by the journal Editor in Chief, Dr. Kai Chang and Wiley‐Blackwell at the request of the second and third named authors, Y. Kaneda and M. Yarborough, who state that the article was written without their input or consent. They refer readers to the original articles which they state correctly represent this research:[1] Y. Kaneda, J. M. Yarborough, L. Li, N. Peyghambarian, L. Fan, C. Hessenius, M. Fallahi, J. Hader, J. V. Moloney, Y. Honda, M. Nishioka, K. Miyazono, H. Shimatani, M. Yoshimura, Y. Mori, Y. Kitaoka, and T. Sasaki, "Efficient, 0.2‐W, all‐solid‐state CW 244‐nm laser," presented at Conference on Lasers and Electro‐Optics 2008, postdeadline paper CPDA2, San Jose, CA, 2008.[2] Y. Kaneda, J. M. Yarborough, L. Li, N. Peyghambarian, L. Fan, C. Hessenius, M. Fallahi, J. Hader, J. V. Moloney, Y. Honda, M. Nishioka, Y. Shimizu, K. Miyazono, H. Shimatani, M. Yoshimura, Y. Mori, Y. Kitaoka, and T. Sasaki, "Continuous‐wave all‐solid‐state 244 nm deep‐ultraviolet laser source by fourth‐harmonic generation of an optically pumped semiconductor laser using CsLiB6O10 in an external resonator," Opt. Lett., vol. 33, pp. 1705‐1707, 2008.
A spiral‐shaped monopole antenna for quad‐band operation of mobile handsets
Authors: Yoon Cheol , Park Wook‐Ki , Kang Suk‐Youb , Park Hyo‐Dal 
Published: August 2008

AbstractABSTRACT: This article presents the design and fabrication of a quad‐band spiral‐shaped monopole antenna for application in a GPS (1575 ± 10 MHz)/DCS (1710–1880 MHz)/PCS (1850–1990 MHz) with a UMTS (1920–2170 MHz) band. To obtain sufficient bandwidth in VSWR < 2, an air layer is inserted between the ground plane and the substrate. A spiral‐shaped monopole antenna that has a quad‐band characteristic is used. Important design parameters are the spiral radiator gap's width and length, the air‐gap's height, and the feed point's position. From these optimized parameters, a spiral‐shaped monopole antenna is fabricated and measured. The measured results of the fabricated antenna are obtained from all bands at 940 MHz bandwidths in VSWR < 2 referenced to the center frequency, and the individual gain at 2.2 dBi, 2.5 dBi, 2.6 dBi, and 2.6 dBi. The experimental 3 dB beam width is shown to be broad across the pass band in the E‐plane, and 74°, 68°, 64°, and 60°, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2860–2863, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23810
The fully‐integrated CMOS RF power amplifier using the semilumped transformer
Authors: Jin Boshi , Han Kichon , Choi Jinsung , Kang Daehyun , Kim Bumman 
Published: August 2008

AbstractA semilumped output transformer for fully‐integrated RF CMOS power amplifier is proposed in this paper. To demonstrate this transformer, a 2.5‐GHz CMOS power amplifier is implemented with a 0.18‐μm RF CMOS process used for WiMAX application. The power amplifier can achieve 39% PAE (power added efficiency) at P1dB (1 dB compression point) and output power of 30 dBm. The linearity can satisfy the spectrum mask of the WiMAX signal requirement basically. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2857–2860, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23811
Metamaterial multiresonances in waveguide and metasurfaces
Authors: Aznabet M. , Beruete M. , Navarro‐Cía M. , El Mrabet O. , Falcone F. , Aknin N. , Essaaidi M. , Sorolla M. 
Published: August 2008

AbstractIn spite of the fact of its potential relevance for future advanced metamaterial design, split rings resonators high‐order resonances data are very limited in the literature. This article presents these co‐ and cross‐polarization high‐order resonances by means of numerical electromagnetic simulation and measurements in both monomode waveguides and free space propagation. A good agreement between simulation and experiments has been observed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2825–2827, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23812
Minkowski fractal boundary single feed circularly polarized microstrip antenna
Authors: Nageswara Rao Pasumarthy , Sarma N.V.S.N. 
Published: August 2008

AbstractA single feed circularly polarized Minkowski fractal boundary microstrip antenna is presented. By changing the fractal dimension of the boundary in both the directions of the antenna it is established that a very good circular polarization with 3 db axial ratio bandwidth of about 1.4% is realizable. Furthermore it is shown that the surface area occupied by the antenna is reduced compared with the Euclidean‐shaped patch antennas without much degradation in gain of the antenna. Experimental results are compared with simulated results and a very good agreement is obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2820–2824, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23813
Triple‐band CPW‐fed monopole antenna with branch strips for wireless applications
Authors: Liu Wen‐Chung , Jaw Jieh‐La , Chen Bohr‐Chun 
Published: August 2008

AbstractBy properly loading branch strips to a monopole antenna fed by a coplanar waveguide (CPW) feedline, an antenna with good impedance matching in a wide triple‐band covering PCS‐1900/UMTS‐2100 and the 5.2/5.8 GHz WLAN systems is designed. Prototype of the proposed antenna has been constructed and experimentally studied. The measured results not only explore wide −10 dB impedance bandwidths of 21, 18, and 15% at the operating bands of 2.16, 5.27, and 7.52 GHz, respectively, but also show good agreement with the numerical predictions. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2794–2797, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23815
Study of a band‐notched double printed dipole antenna
Authors: Wang Fa‐Jia , Zhang Jin‐Sheng 
Published: August 2008

AbstractIn this article, a double‐printed dipole antenna with band‐notched function for UWB applications is proposed and investigated. The band‐notched characteristic is achieved by inserting two U‐shaped slots on the dipole. Experimental and numerical results show that the proposed antenna meets the requirement of 3.1–10.6 GHz UWB systems with VSWR < 2, while avoiding the interference with the 5 GHz WLAN band. Transmitting antenna transfer function, receiving antenna transfer function, and antenna system function are used to describe the antenna performance. The impulse responses in time domain were calculated using inverse Fourier transform. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2986–2989, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23816
Microstrip low‐pass filter using open loop resonators
Authors: Ranjan Jha Kumud , Nehra Neeraj 
Published: August 2008

AbstractA compact open loop resonator microstrip low pass filter is modeled. To optimize the performances of the filter, electromagnetic simulation is used to tune the dimensions of proposed prototype. Cascading of open loop resonator provides a very sharp cut off and wide stop band with minimum insertion loss. The filter is simulated with an equivalent circuit model and it is found to be in good agreement with the structure model response. The structure provides a near ideal response. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2983–2986, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23817
Influence of metal‐semiconductor contact on the transmission characteristics of image dielectric waveguide
Authors: Dudorov S. N. , Lioubtchenko D. V. , Räisänen A. V. 
Published: August 2008

AbstractInfluence of a “Schottky‐like” barrier on a Silicon rod waveguide to its propagation characteristics were studied in W‐band. A considerable positive phase shift was observed, with a maximum at about 99 GHz (about 10 radians at 30‐mm long waveguide). Maximal insertion loss was also observed at the same frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2925–2928, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23820
Flat‐plate triangular monopole antenna for Wi‐Fi/WiMAX/DVB‐H applications
Authors: Pazin Lev , Kogan Igor , Leviatan Yehuda 
Published: August 2008

AbstractA novel printed multiband flat‐plate monopole antenna is presented. The proposed antenna consists of a slotted triangular monopole embedded in a rectangular notch in the antenna ground plane part. Simulated and measured results of the input return loss for the proposed antenna are in good agreement. The antenna has been shown to operate satisfactorily in the 0.42–0.92, 1.8–2.7, 3.1–3.8, and 4.9–6 GHz frequency bands, and is therefore very suitable for use in applications including Wi‐Fi, WiMAX, and DVB‐H. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2922–2925, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23821
Synthesis formulas for microcoplanar striplines
Authors: Guney Kerim , Yildiz Celal , Kaya Sabri , Turkmen Mustafa 
Published: August 2008

AbstractThis article presents new and accurate synthesis formulas for the microcoplanar stripline (MCS). The synthesis formulas are obtained by means of a differential evolution algorithm, and are useful to microwave engineers for accurately calculating the physical dimensions of MCS. The average percentage error is calculated to be 0.9% for 2254 MCS samples having different electrical parameters and physical dimensions, as compared with the results of the quasi‐static analysis. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2884–2888, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23823
Aperture field reconstruction by calculated cylindrical near field
Authors: Castelo Boso Alcino , de Haro Ariet Leandro , Luis Besada José 
Published: August 2008

AbstractA method for determining the aperture field distribution of an array antenna from near‐field measurement over the surface of a right circular cylinder enclosing the antenna is applied here. The approach relies on the concept of information content of the field. The truncation problem is solved by picking up the information that is lost due to the finite size of scanning area, in points of the space reachable by the measurement system. In this article, we rebuild the field at the aperture from near‐field cylindrical calculated on the surface of measure, with dependence on the variable phi, and without dependence on the variable phi. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2849–2851, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23825
A novel broadband CPW‐fed asymmetrical slot antenna
Authors: Zhang Li , Jiao Yong‐Chang , Song Kun , Zhang Fu‐Shun 
Published: August 2008

AbstractIn this article, a novel CPW‐fed broadband asymmetrical slot antenna is proposed. The prototype consists of an asymmetrical slot and a tuning stub. From experimental results, the measured impedance bandwidth of this antenna, defined by −10 dB return loss, can reach an operating bandwidth of 6.63 GHz (2.27–8.9 GHz), or about 118.7% with the center frequency operating at 5.585 GHz. Also, good radiation patterns and gains covering the operating band have been observed. Details of the antenna design and experimental results are discussed in this article. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2817–2820, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23826
A Ka‐band CMOS power amplifier using new substrate‐shielded coplanar waveguide
Authors: Lee Jong‐Wook , Heo Sang‐Moo 
Published: August 2008

AbstractA Ka‐band three‐stage power amplifier was developed in 0.18 μm CMOS technology using a new substrate‐shielded coplanar waveguide (CPW). The new CPW structure reduces the loss from the conductive silicon substrate allowing high gain for the amplifier. Broadband modeling of substrate‐shielded CPW in conjunction with the RF transistor model up to 40 GHz resulted in accurate gain matching of the amplifier. The power amplifier achieved a 12 dB small‐signal gain at 26.5 GHz, which is the highest for Ka‐band CMOS power amplifiers using common‐source transistors. The measured output power was 12.5 dBm with a power‐added‐efficiency of 8% at 26.5 GHz. These results show that scaled‐down CMOS technology is a viable option for low‐cost microwave and millimeter‐wave circuits. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2815–2817, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23827
A configurable L/S‐band integrated elliptical lowpass filter utilizing MEMS technology
Authors: Zhang Shumin , Elkis Radmil , Jasti Srinivas , Su Wansheng , Zaghloul Mona 
Published: August 2008

AbstractIn this article, the design, analysis, and implementation of a dual band 1 GHz/3 GHz elliptical filter utilizing a micro‐electro‐mechanical systems (MEMS) switch is introduced. The band selection is achieved via MEMS‐switch configurable capacitor structures. The RF MEMS switch uses thermal actuation and is separately fabricated and characterized; the switch achieves an insertion loss of 0.7 dB and an isolation of 45 dB. The elliptical filter is implemented using active frequency‐dependent negative resistor (FDNR) structures. The filter achieves 29 dB of rejection at a 500 MHz offset from the 944 MHz corner, and 26.2 dB of rejection at a 1 GHz offset from the 3.06 GHz corner. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2791–2794, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23828
Ultra‐wide band microwave filter utilizing quarter‐wavelength short‐circuited stubs
Authors: Shahrazel Razalli Mohammad , Ismail Alyani , Adzir Mahdi Mohd , Nizar Hamidon Mohd 
Published: August 2008

AbstractFive poles quarter‐wave short‐circuited stubs is designed and developed to support the ultra‐wide band (UWB) applications. The filter, with a total size of 41 mm × 12 mm operates within 2.7–9.83 GHz, produces a fractional bandwidth of greater than 100%. The filter is fabricated on RT/Duroid 5880 board with thickness of 0.508 mm. Measured results indicate that the filter, consisting of five short‐circuited stubs, and a stepped impedance transmission line can cover up to 114% bandwidth within UWB frequency range with insertion loss (S21) better than 1.27 dB. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2981–2983, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23830