bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parallel implementation of the ADI‐FDTD method
Authors: Stefański T. , Drysdale T. D. 
Published: March 2009

AbstractWe present a parallel implementation of the three‐dimensional alternating direction implicit finite‐difference time‐domain (ADI‐FDTD) method in Cartesian coordinates using the message passing interface (MPI) library. Parallel implementations not only speed up computations but also increase the maximum solvable problem size. The application of the ADI scheme results in freeing the time‐step size from the Courant‐Friedrichs‐Lewy stability constraint. We demonstrate a speedup of the ADI‐FDTD method through parallelization, even though the communication overhead between the processors is proportional to the volume of the domain, rather than just the surface area of the subdomains as for standard parallel FDTD. We benchmarked our code on an IBM p690 symmetric multiprocessor and also a distributed memory computer cluster with a high‐bandwidth Infiniband interconnect. In both cases, satisfactory scalability and efficiency was demonstrated for simulation domains comprising up to 8 billion mesh cells. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1298–1304, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24310
A CMOS LC injection‐locked frequency divider with the division ratio of 2 and 3
Authors: Jang Sheng‐Lyang , Lee Chien‐Feng , Luo Jhong‐Chen 
Published: March 2009

AbstractThis article proposes a new CMOS LC‐tank injection locked frequency divider (ILFD) fabricated in a 0.18‐μm CMOS process and describes the operation principle of the ILFD. The ILFD circuit is realized with a double cross‐coupled CMOS LC‐tank oscillator with a symmetric MOS‐switched LC resonator. The ILFD can be used as a first‐harmonic injection‐locked oscillator, divide‐by‐2 and divide‐by‐3 frequency divider depending upon the frequency of the injection signal. Measurement results show that at the supply voltage of 1.8 V, the free‐running frequency is from 5.12 to 5.64 GHz. The core current and power consumption of the divider are 2.76 mA and 4.97 mW, respectively. At the incident power of 0 dBm, the locking range is from the incident frequency 9.48 to 11.48 GHz (15.04 to 17.12 GHz) in the divide‐by‐2(3) mode. © 2009 Wiley Pe riodicals, Inc. Microwave Opt Technol Lett 51: 1263–1267, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24312
Compact modified trapezoid‐shaped ultra‐wideband antenna with parasitic loops
Authors: Jung Jinwoo , Lee Hyeonjin , Lim Yeongseog 
Published: March 2009

AbstractA modified trapezoid‐shaped monopole antenna for ultra‐wideband operation having compact dimensions (12.7 × 22.5 × 1.6 mm3) is proposed. With a modified trapezoid radiator and parasitic loops, the proposed antenna has a very wide impedance bandwidth measured at 8.41 GHz (3.06–11.47 GHz, defined by 2:1 VSWR). The group delay, phase, and transmission loss are also measured and discussed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1261–1263, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24313
Miniaturization interdigital hairpin microstrip bandpass filter
Authors: Hsu Cheng‐Hsing , Tung Hsin‐Han , Hsu Chen‐Kang 
Published: March 2009

AbstractA four‐pole elliptic function bandpass filter is designed using compact miniaturized microstrip interdigital hairpin resonator. Miniaturization hairpin resonator is realized by using an interdigital structure having parallel coupled lines. The full‐wave simulator IE3D is used to design the interdigital hairpin resonator and to calculate the coupling coefficient of the basic coupling strictures. The response of the fabricated filters using FR4 substrate is designed at a centre frequency of 1.8 GHz. The compact size and the performance of this class of filter have been demonstrated. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1363–1366, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24314
Dual‐mode dual‐band bandpass filter based on double‐sided parallel‐strip line
Authors: Yin Zhang Xiu , Shi Jin , Chen Jian‐Xin , Xue Quan 
Published: March 2009

AbstractThis article presents a dual‐mode dual‐band bandpass filter based on double‐sided parallel‐strip line with an inserted conductor plane. Due to the isolation property of the conductor plane, this structure can provide two separate transmission paths to generate two passbands. No extra combination circuits are required at the input/output ports, simplifying the design and reducing circuit area. To demonstrate this idea, an experimental filter is implemented. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1361–1363, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24315
Compact coplanar design for harmonic suppression in microstrip antenna
Authors: Xiao Shaoqiu , Wang Bing‐Zhong , Jiang Li , Gao Shanshan 
Published: March 2009

AbstractIn this letter, the compact coplanar designs of the microstrip antenna are performed to suppress the harmonic radiations. The antennas with the second‐order harmonic suppression as well as the second‐ and the third‐order harmonic suppressions are designed, respectively. The results indicate that good harmonic suppression performance is achieved without increasing remarkably additional circuit area and decreasing antenna performances. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1326–1329, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24317
Wide‐band low‐loss CPW‐based composite right/left‐handed transmission line
Authors: Dolatsha Nemat , Shahabadi Mahmoud 
Published: March 2009

AbstractIn this article, a coplanar waveguide (CPW)‐based composite right/left‐handed transmission line (CRLH TL) is introduced. The structure is realized by parallel‐plate series capacitors (C) and shunt CPW stub inductors (L). Using a symmetric configuration for the unit cells along with searching for optimum values of LC components, we reduce the insertion loss and achieve wider LH‐bandwidth. For the symmetric CRLH TL, a LH‐passband extending from 1.3 to 4 GHz and a RH‐passband extending from 4 to 6.5 GHz are measured. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1388–1390, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24319
9.1 dBm IIP3 36 dB gain controllable LNA for WCDMA in 0.13‐μm CMOS
Authors: Phan Tuan Anh , Farrell Ronan , Lee Sang‐Gug 
Published: March 2009

AbstractThis article presents a low‐power, high‐linearity cascode‐type low noise amplifier (LNA) with 36 dB of variable gain for the WIDE Code Division Multiple Access systems. By enhancing the substrate resistance of a common gate transistor along with adopting multiple‐gate technique, the linearity is significantly improved. Shunt‐current steering is adopted for smooth gain control. Step gain mode is used to further increase the gain control range. The main common source transistor is disabled in attenuation mode, saving unwanted power consumption. Measurements show maximum gain of 12.3 dB with S11 of −19.5 dB, and S22 of −14 dB. The total gain control range is 36 dB. NF is measured as 2 dB and two‐tone test shows 9.1 dBm of IIP3. Implemented in 0.13‐μm CMOS technology, the LNA consumes only 1.6 mA at maximum gain mode and only 0.2 mA in attenuation mode from 1.2 V supply. Its die size is 0.3 mm2. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1385–1388, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24320
Resonant properties of the Sierpinski‐based fractal resonator and its application on low‐loss miniaturized dual‐mode bandpass filter
Authors: Ye Chang‐Sin , Su Yan‐Kuin , Weng Min‐Hang , Wu Hung‐Wei 
Published: March 2009

AbstractIn this article, resonant characteristics of novel microstrip resonators based on the Sierpinski carpet fractal geometries are proposed in detail. With increasing the iteration order of the Sierpinski‐based fractal resonators, the resonant frequency is decreased but the unloaded quality factor is slightly enhanced. The resonant properties are discussed using the RLC equivalent circuit. Additional, the design guide for bandpass filter using the nth order resonator is also developed. Using these fractal resonators, several dual‐mode bandpass filters using different order resonators can be designed and fabricated to verify the advantages of the size and insertion loss reduction. It is also found good agreement between the simulation and measurement is achieved. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1358–1361, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24321
Effect of tapering shape on performance of broadside‐coupled directional couplers
Authors: Abbosh Amin M. 
Published: March 2009

AbstractA theoretical model is used to investigate effect of the tapering shape on performance of the broadside‐coupled directional coupler. It is shown that the tapering shape has a significant effect on the overall performance. Concave shapes give a broader bandwidth compared with the convex shapes. The model also shows that a proper choice of the tapering shape can result in a significant improvement in the performance across a wide bandwidth. The theoretical findings of the model are supported by simulations, and measurements. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1285–1288, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24325
Low‐profile GSM‐DCS‐PCS‐UMTS wire patch antenna on small ground plane
Authors: Assila Labhib , Ribero Jean‐Marc , Staraj Robert , Dubard Jean‐Lou 
Published: March 2009

AbstractA small radiating element, designed to work simultaneously in GSM‐DCS‐PCS‐UMTS‐frequency bands, totally made up of metallic square parts on an air substrate is described. The total size of the supporting ground plane is smaller than λ/2 for the lower working frequency. By stacking two square wire‐patches, it is well‐known that both compactness, large bandwidth, and monopolar wire radiation pattern can be achieved. However, multiband behavior is always difficult to obtain using only stacked elements. The antenna proposed in this article uses two U slots in the upper plate to obtain the two desired frequency bandwidths. This new structure allows an easy realization and can be protected by a dielectric radome that could be taken into account during the optimization of the structure. Owing to its low profile, low cost and radioelectric properties such as large bandwidth and dipolar type radiation pattern, this antenna is very suitable for automobile or indoor ceiling applications needing a very small ground plane. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1247–1250, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24327
Characterization of interdigital stub with defected ground structure
Authors: Pyo Seongmin , Baik Jung‐Woo , Lee Dong‐Hyo , Kim Young‐Sik 
Published: March 2009

AbstractA new scheme with an interdigital line and a defected ground structure for dual‐band operation is dealt with in this letter. The proposed structure is analyzed using a series L‐C resonator model added a parasitic shunt capacitance. The nonlinear phase of this structure is dependent on the dumbbell size of the defected ground. This proposed scheme is applicable for a short‐ended stub circuit and a dual pass‐band filter at the centre frequencies of 860 and 1810 MHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1353–1356, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24331
Hybrid IPO‐BI‐FEM for the analysis of 2D large radome with complex structure
Authors: Meng Hongfu , Dou Wenbin 
Published: March 2009

AbstractIn this article, the iterative physical optics‐boundary integral‐finite element method (IPO‐BI‐FEM) is proposed for the analysis of electrically large radomes with complex structures, such as the multilayered tip, the rain erosion protective cap. The flat smooth sections of the radome are modeled using physical optics (PO), and the boundary integral‐finite element method (BI‐FEM) is adopted to treat the complex structures and their near regions. The fields radiated from the PO currents are coupled into the BI‐FEM equation to realize the hybridization. This hybrid method is employed iteratively to account for the mutual interactions among the radome, resulting into IPO‐BI‐FEM. The present method is more accurate than high frequency method for analyzing radomes with complex structures and more efficient than low frequency method for electrically large radomes analysis. The validation examples and some numerical results are presented. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1348–1353, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24332
0.7 V supply highly linear subthreshold low‐noise amplifier design for 2.4 GHz wireless sensor network applications
Authors: Jhon Hee‐Sauk , Jung Hakchul , Koo Minsuk , Song Ickhyun , Shin Hyungcheol 
Published: March 2009

AbstractA low supply voltage and highly linear subthreshold CMOS low noise amplifier (LNA) for 2.4 GHz wireless sensor network applications is presented in this letter. We applied multiple gated transistor (MGTR) technique in subthreshold region to compensate the linearity degradation of low supply cascode topology. Moreover, the feedback capacitor, Cf is used to enhance the power gain of amplifier without additional dc‐power dissipation. The proposed LNA has gain of 13.1 dB, noise figure (NF) of 3.8 dB, and −2.5 dBm IIP3 while dissipating only 0.49 mW from 0.7 V supply. The LNA has been designed using a 0.13 μm 1P8M standard CMOS process with top metal thickness of 3.3 μm. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1316–1320, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24333
Membrane‐based fiber Bragg grating pressure sensor with high sensitivity
Authors: Liu Lihui , Li Yanqiu , He Yongtai , Li Fang , Liu Yuliang 
Published: March 2009

AbstractA fiber Bragg grating (FBG) pressure sensor packaged by using a hard core in the membrane is presented. By utilizing the unique membrane‐based FBG packaging method, its pressure sensitivity has been effectively enhanced. The pressure sensitivity of the FBG reaches 5.75 × 10−3/MPa within the pressure range of 0–0.16 Mpa. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1279–1281, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24335
Internal planar WWAN laptop computer antenna using monopole slot elements
Authors: Wong Kin‐Lu , Chu Fang‐Hsien 
Published: March 2009

AbstractA planar WWAN (wireless wide area network) antenna comprising two monopole slots operated at their quarter‐wavelength modes for GSM850/900/1800/1900/UMTS operation in the laptop computer is presented. With the use of monopole slot elements, the antenna can be easily printed on an inexpensive FR4 substrate and show a planar structure for promising applications in the thin‐profile laptop computer. The antenna can provide two wide operating bands at about 900 and 1900 MHz to cover all the five operating bands for WWAN operation and yet occupies a small area of 10 × 75 mm2 in the narrow spacing between the display and the laptop computer casing. The user's hand effects on the antenna performances when the touch panel or touch screen is used for the laptop computer are also studied. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1274–1279, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24336
Low‐frequency miniaturized dual‐band frequency selective surfaces with close band spacing
Authors: Xu Rong‐Rong , Zong Zhi‐Yuan , Wu Wen 
Published: March 2009

AbstractIn this article, a novel miniaturized dual‐band frequency selective surface (FSS) with close band spacing is presented, in which each periodic cell consists of double square loops with different capacitive loadings. The dimension of the unit cell is miniaturized by loading with ceramic chip capacitors. To eliminate the undesired coupling between unit cells, the unit cells are placed in the substrate integrated waveguide cavity structure. As a result, a dual‐band FSS with close band spacing is designed, both simulated and measured results show that the dual‐band FSS operates over DCS1800 (1.8 GHz) and Bluetooth (2.45 GHz) frequency range. And the FSS dimension is miniaturized to 0.114 λ (λ refers to the resonant wavelength of 1.8 GHz). Furthermore, it has very good stability to oblique incidence waves for both TE and TM polarization. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1238–1240, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24338
Compact CPW‐fed planar monopole antenna for dual‐band WLAN applications
Authors: Zhang Tian‐Ling , Yan Ze‐Hong , Song Yue , Chen Lei 
Published: March 2009

AbstractA compact and simple monopole antenna with CPW‐fed structure is proposed for application in dual‐band WLAN systems. The proposed antenna, which resembles the shape of the letter “e”, has a compact size of only 27 × 18 × 1.6 mm3 including the ground. By fabricated and measured, the proposed antenna covers both 2.4 GHz (2.4–2.484 GHz) and 5 GHz (5.15–5.825 GHz) bands and provides good radiation characteristics and antenna gains for the operating bands. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1377–1379, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24339
Reproductive assessment of hydroalcohol extract of Calendula officinalis L. in Wistar rats
Authors: Silva Erick J. R. , Costa‐Silva João H. , Evêncio Liriane B. , Fraga Maria do Carmo C. A. , Coelho Maria Cristina O. C. , Wanderley Almir G. 
Published: March 2009

AbstractThe present study was conducted to evaluate the effects of the administration of a hydroalcohol extract of Calendula officinalis L. flowers (HAE) on the reproductive function of Wistar rats. Four groups of adult male rats were treated orally with HAE at doses of 0, 0.25, 0.5 and 1.0 g/kg for 60 consecutive days. From day 53 to 60 of treatment, rats were mated with untreated and fertile female rats. Reproductive parameters including testicular morphology, reproductive organ weights, fertility index and offspring viability were evaluated. In another protocol, groups of pregnant rats were treated orally with the same doses of HAE from days 1 to 6 (preimplantation period), 7 to 14 (organogenic period) or 15 to 19 (fetal period) of pregnancy. On day 20 of pregnancy, rats were killed for evaluation of maternal and fetal parameters. The results showed that the treatment with HAE did not affect male reproductive parameters. Besides, it was non‐toxic in the preimplantation and organogenic periods of pregnancy. However, the HAE induced a decrease of the maternal weight gain when administered during the fetal period. In conclusion, the HAE did not affect male fertility nor had toxic effects in early and middle periods of pregnancy. However, the HAE caused maternal toxicity when administered during the fetal period of pregnancy. Copyright © 2009 John Wiley & Sons, Ltd.
Anti‐inflammatory properties of cryptolepine
Authors: Olajide Olumayokun A. , Ajayi Abayomi M. , Wright Colin W. 
Published: March 2009

AbstractCryptolepine is the major alkaloid of the West African shrub, Cryptolepis sanguinolenta. Cryptolepine has been shown to inhibit nitric oxide production, and DNA binding of Nuclear Factor‐kappa B following inflammatory stimuli in vitro. In order to validate the anti‐inflammatory property of this compound in vivo, we investigated its effects on a number of animal models of inflammation. Cryptolepine (10–40 mg/kg i.p.) produced significant dose‐dependent inhibition of the carrageenan‐induced rat paw oedema, and carrageenan‐induced pleurisy in rats. These effects were compared with those of the non‐steroidal anti‐inflammatory drug indomethacin (10 mg/kg). At doses of 10–40 mg/kg i.p., cryptolepine inhibited lipopolysaccharide (LPS)‐induced microvascular permeability in mice in a dose‐related fashion. Oral administration of up to 40 mg/kg of the compound for four consecutive days did not induce gastric lesion formation in rats. Analgesic activity was also exhibited by cryptolepine through a dose‐related (10–40 mg/kg i.p.) inhibition of writhing induced by i.p. administration of acetic acid in mice. The results of this study reveal that cryptolepine possesses in vivo anti‐inflammatory activity. Copyright © 2009 John Wiley & Sons, Ltd.
Neuroactive flavonoid glycosides from Tilia petiolaris DC. extracts
Authors: Loscalzo Leonardo M. , Wasowski Cristina , Marder Mariel 
Published: March 2009

AbstractPharmacological assay guided purification of an ethanol extract of Tilia petiolaris DC. inflorescences resulted in the isolation and identification of isoquercitrin (ISO), quercetin 3‐O‐glucoside‐7‐O‐rhamnoside (QUE) and kaempferol 3‐O‐glucoside‐7‐O‐rhamnoside (KAE). The behavioral actions of these glycosylated flavonoids were examined in the hole board, locomotor activity and thiopental‐induced loss of righting reflex tests in mice. QUE (10 and 30 mg/kg) and KAE (30 mg/kg), intraperitoneally (i.p.) administered to mice, reduced all the parameters measured in the hole board test, but ISO (30 mg/kg) only reduced the number of rearings. Meanwhile QUE at 30 mg/kg i.p. also decreased the ambulatory locomotor activity and increased the sodium thiopental‐induced time of loss of the righting reflex suggesting a clear depressant action. The above results demonstrate the occurrence of neuroactive flavonoid glycosides in Tilia. Copyright © 2009 John Wiley & Sons, Ltd.
The effect of Echinacea purpurea (L.) Moench extract on experimental prostate hyperplasia
Authors: Skaudickas D. , Kondrotas A. J. , Kevelaitis E. , Venskutonis P. R. 
Published: March 2009

AbstractThe aim of this study was to examine the effect of purple coneflower (Echinacea purpurea L. Moench) on the prostate gland of rats using an experimental model of benign prostate hyperplasia (BPH). The animals were administered 50 mg/kg of extract preparation for 4 and 8 weeks and the prostate mass and structural degenerative changes were evaluated in the course of the experiment. The administration of E. purpurea extract to rats with hyperplasia for 4 and 8 weeks gradually and significantly reduced the prostate mass and reversed the degenerative changes in the structure of the prostate gland. The present investigation suggests extract of purple coneflower prevents the development of BPH. Copyright © 2009 John Wiley & Sons, Ltd.
Inhibition of lung metastasis in mice by oligonol
Authors: Lee Sung‐Jae , Chung Ill‐Min , Kim Min‐Young , Park Keum‐Duk , Park Won‐Wan , Moon Hyung‐In 
Published: March 2009

AbstractOligonol is a polyphenol formulation enriched with catechin‐type oligomers. As an initial approach to assess the chemopreventive potential of Oligonol, the study investigated the effects of Oligonol on the inhibition of lung metastasis induced by B16F‐10 melanoma cells in C57BL/6 mice. Oligonol, which is abundantly found in plants, vegetables and fruits, was found to possess antimetastatic activity against B16F‐10 melanoma cells. Continued consumption of Oligonol, even at high doses, for long periods does not seem to cause any toxic symptoms because excess Oligonol is stored in adipose tissue rather than in the liver. However, the mechanism by which Oligonol exerts its antimetastatic activity remains unclear. Further investigations are required to clarify the exact role of Oligonol in such B16F‐10 melanoma regulation. Copyright © 2009 John Wiley & Sons, Ltd.