bluuebunny/crossref_metadata_2025_split huggingface dataset:
Soft computing techniques on multiresonant antenna synthesis and analysis
Authors: Demircioglu Erdem , Sazlı Murat H. , İmeci Sehabeddin Taha , Sengul Orhan 
Published: August 2013

ABSTRACTThe synthesis and analysis of a multiresonant microstrip patch antenna using soft computing techniques are presented. The multiresonance is obtained via attaching inverted L‐shaped stubs to the radiated edges of the single frequency patch antenna. The physical geometry of the proposed antenna is synthesized using adaptive‐neuro‐fuzzy inference systems and the calculated dimensions are applied to the artificial neural network for the analysis process. The return loss and phase of the scattering parameters are computed. The modeled antenna provides 95% accuracy and sufficient results compared with the simulation and measurement results. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2643–2648, 2013
A 60 GHz transceiver for low power ad hoc networks
Authors: Loyez Christophe , Bocquet Michael , Rolland Nathalie 
Published: August 2013

ABSTRACTThis article presents a low‐power consumption architecture of RF transceiver using impulse radio signals operating at 60 GHz. Both intrinsic features and related technologies of this operating frequency are detailed and the specific topology of this communication and geolocalization system is introduced. The performance of this low‐power consumption system is validated experimentally. The emitter exhibits an energy efficiency down to 10 pJ/bit and data rates up to 10 Mbps. Geolocalization ability of this 60 GHz system is also experimentally demonstrated with localization accuracy in the range of 40 cm. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2640–2643, 2013
Balanced BPF with wide upper stopband and wide common‐mode suppression response for WiMax applications
Authors: Lee Ching‐Her , Hsu Chung‐I.G. , Wen Pi‐Hung 
Published: August 2013

ABSTRACTThis article presents a new balanced bandpass filter (BPF), which is designed using coupled stepped‐impedance slot‐line resonators (SISLRs) fed by microstrip feeding lines. The SISLRs are deployed symmetrically with respect to the plane of symmetry to achieve favorable differential‐mode (DM) response and high common‐mode (CM) rejection. For DM operation, the plane of symmetry is virtually grounded, and resonance can occur for each half SISLR. For CM operation, the resonator boundary along the plane of symmetry is open‐circuited, rendering the half SISLRs structure incomplete and hence, causing weak signal transmission. A prototype of the proposed balanced BPF was implemented, and good agreement was observed between simulated and measured results. The designed BPF has a measured minimum DM insertion loss of 1.13 dB in the passband of 3.38–3.72 GHz, in which the measured CM suppression is larger than 55.76 dB. In particular, the upper DM stopband with 20 dB rejection extends up to 21.05 GHz, and the CM suppression is larger than 26.5 dB in the whole displayed frequency range of 2–22 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2609–2611, 2013
A low‐consumption electronic system developed for a 10 km long all‐optical extension dedicated to sea floor observatories using power‐over‐fiber technology and SPI protocol
Authors: Frederic Audo , Veronique Quintard , Mikael Guegan , Andre Perennou , Yves Auffret 
Published: August 2013

ABSTRACTA 10‐km long extension using power‐over‐fiber technology and dedicated to sea floor observatories is presented with a particular focus on the electrical both ends units. We propose a solution using a serial peripheral interface 3 wires protocol for large range of low‐power sensors like hydrophones. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2562–2568, 2013
Mode discussion of the microstrip traveling antenna
Authors: Wang Chien‐Jen , Tai Yang 
Published: August 2013

ABSTRACTThis work examines the resonant‐mode analysis of the microstrip traveling antenna (or calling the leaky‐wave antenna). Considering the traveling antenna as an open‐end structure, the antenna embodiment can be analyzed by utilizing the cavity‐mode analysis. In order to understand the resonant characteristics of the traveling antenna, we use two traditional traveling antennas with two different lengths. The corresponding relationship between the resonant modes for the short and long antennas is derived. The radiation mechanism of the antenna is also explained with aid of the equivalent magnetic current density. The antenna designers can predict the resonant modes of the traveling antenna without utilizing expensive EM simulation software. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2556–2562, 2013
Compact multi and wide‐bandwidth of printed inverted‐F antenna for wireless communication applications
Authors: Elsheakh Dalia 
Published: August 2013

ABSTRACTCompact multi and wide‐bandwidth printed inverted‐F antennas are proposed in this article. The proposed antennas are printed on commercial thin FR4 substrate with suitable antenna volume 20 × 50 × 1.6 mm3 to be easily integrated behind laptop screen. The printed‐inverted‐F antenna (IFA) achieved by combining L‐loaded printed‐IFA with two printed underneath radiators connected to the other side by vias. By adjusting stub via location, it may be obtained multi or wideband resonant antenna. These antennas are suitable for GSM 0.85/1.8 GHz, long‐term evolution wireless 1.5, 1.9, 2.1 GHz and from 2.5 to 2.7 GHz, and industrial, scientific, and medical 2.45 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2803–2808, 2013
Liquid crystal based Rotman lens antenna with switchable monopulse patterns
Authors: Christie Steven , Cahill Robert , Mitchell Neil , Munro Yvonne , Manabe Atsutaka 
Published: August 2013

ABSTRACTAn electronically reconfigurable Rotman lens is described which generates multiple beams that can be switched from monopulse sum to difference radiation patterns when used in conjunction with a six element Vivaldi antenna array. This is achieved by exploiting the voltage‐dependent dielectric anisotropy property of nematic state liquid crystals to provide switched 0° and 180° phase shifts in the array feed lines. The viability of the concept is demonstrated by designing an antenna which exhibits dynamically reconfigurable monopulse radiation patterns over the frequency band 6–10 GHz. Measured and simulated results are shown to be in good agreement. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2721–2726, 2013
Millimeter‐wave CMOS lowpass and highpass filters with transmission zeros based on coupled‐line and transmission line
Authors: Tanii Kosei , Wada Koji , Makimoto Mitsuo , Igarashi Sadao , Fukui Kuniaki , Kobinata Kouichi 
Published: August 2013

ABSTRACTA millimeter‐wave lowpass and highpass filters are proposed by using a coupled‐line and a transmission line. Because these proposed filters have transmission zeros, the conditions of them are found by using even and odd modes analysis. Then, complementary metal oxide semiconductor technology is applied to the proposed filters. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2808–2813, 2013
A CPW‐fed hexagonal‐shape monopole‐like UWB antenna
Authors: Gautam A. K. , Chandel Richa , Kr Kanaujia Binod 
Published: August 2013

ABSTRACTA novel CPW‐fed hexagonal‐shape monopole‐like ultrawideband (UWB) antenna is proposed for UWB applications. The proposed antenna posses a method to minimize the monopole antenna by using a hexagonal shape over the conventional monopole patch antenna to lower the height of the antenna. The ground is vertically extended toward two sides of the single radiator. Therefore, the large space around the radiator that is usually wasted can be effectively saved. The antenna is practically fabricated and simulated. Measured results show a good agreement with simulated results. The prototype with very compact overall size of 25 × 23 × 1.6 mm3 achieves good impedance matching, stable radiation patterns, and constant group delay over an operating bandwidth of 2.71–12.61 GHz (9.9 GHz). © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2582–2587, 2013
A CPW‐fed wide‐slot antenna with reconfigurable notch bands for UWB and multi‐band communication applications
Authors: Li Yingsong , Li Wenxing , Mittra Raj 
Published: August 2013

ABSTRACTIn this article, we present a compact wide‐slot antenna with reconfigurable notch bands, for ultra‐wideband (UWB) and multiband communication applications. The dual band‐notch characteristics are realized by using three open‐ended stubs inserted into the fork‐like radiating element, and the reconfigurable characteristics are achieved by integrating ideal switches in the stubs. By controlling the ON/OFF states of the ideal switches, the proposed antenna can function either as a UWB antenna with two notch‐bands, or a single notch‐band UWB antenna, or even a multiband antenna. The simulation and measurement results show that the proposed antenna is suitable for UWB as well as multiband communication systems. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2777–2782, 2013
A BiCMOS Ka‐band RF‐pulse former for short‐range high‐resolution radar and high‐data‐rate communication systems
Authors: Huynh Cuong , Nguyen Cam 
Published: August 2013

ABSTRACTAn ultra‐low‐leakage RF‐pulse former capable of producing very narrow RF pulses with small rising and falling time for short‐range high‐resolution radar and high‐data‐rate communication systems is developed using 0.18‐µm BiCMOS technology. The narrow RF pulses are produced from a continuous‐wave RF signal by gating a high‐speed single‐pole single‐throw switch implemented with small gate‐resistors. The RF‐pulse former exhibits an extremely low RF leakage implementing the RF leaking suppression technique, in which the RF leaking signal is cancelled by combining with its replica using an active balun. In addition, the active balun also amplifies the gated RF pulses hence providing gain for the RF‐pulse former. A graphical analysis based on the insertion loss and isolation contours, enabling selection of the optimum sizes for transistors in the series‐shunt switches, is also presented. From 31 to 37.1 GHz, the designed RF‐pulse former exhibits −1.9 dB (loss) to 1.1 dB (gain) and 14.5–30‐dB input return loss. The output return loss is higher than 10 dB from 33 to 35.9 GHz. From 30 to 40 GHz, the isolation is higher than 40 dB and, especially at 34 GHz, the isolation reaches 70 dB. The rising and falling times were measured as 136 and 70 ps, respectively. Very narrow RF pulses of 200 ps have been generated. The RF‐pulse former consumes a 7.3 mA from a 1.8‐V power supply and occupies a chip area of 0.225 mm2. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2773–2777, 2013
Asymmetrical grounded CPW‐fed antenna for WLAN applications
Authors: Dinesh R. , Vinod V. K. T. , Sarin V. P. , Shameena V.A. , Mohanan P. 
Published: August 2013

ABSTRACTA novel compact asymmetrical grounded coplanar waveguide‐fed antenna for dual‐band operation is presented. The modified asymmetric ground and slit on the radiating element provides dual band covering 2.4 and 5.2 GHz WLAN operation. A prototype of proposed antenna has been fabricated and tested. The antenna offers omnidirectional radiation pattern at 2.4 GHz and directional radiation pattern at 5.2 GHz. The peculiarity of the design is that each band can be independently tuned by varying the current paths. The antenna has an overall dimension of 26.5 × 5.7 × 1.6 mm3 when printed on a substrate of relative permittivity 4.4. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2739–2741, 2013
Design of compact tri‐band bandpass filter using centrally loaded resonators
Authors: Chen Fu‐Chang , Qiu Jie‐Ming , Chu Qing‐Xin 
Published: August 2013

ABSTRACTTri‐band bandpass filter using centrally loaded resonators is presented in this article. The triple‐passband characteristics are realized by properly controlling the lengths and impedances of the uniform impedance resonator and the stub. To illustrate the concept, two tri‐band filters are designed, fabricated, and measured. Simulated and measured results are found to be in good agreement with each other. The prototype of the tri‐band filters achieve insertion loss of 1.6, 1.9, and 1.9 dB at 2.4, 3.5, 5.8 GHz, 1.2, 1.3, and 1.3 dB at 1.57, 2.45, 5.2 GHz, respectively. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2695–2699, 2013
Dual‐band bandpass filter using multimode square ring loaded resonators
Authors: Liu Haiwen , Ren Baoping , Li Shen , Lei Jiuhuai 
Published: August 2013

ABSTRACTA novel microstrip dual‐band bandpass filter (BPF) with multimode square ring loaded resonators (SRLRs) is proposed in this article. The improved SRLR is loaded by a meander ring stub and a stepped‐impedance resonator for compactness to realize the dual‐band performances. Even‐ and odd‐mode method is applied to explain mode splitting characteristics. Moreover, another mode in the second passband is generated by adding a half‐wavelength U‐shaped resonator. This resonator also introduces cross‐coupling between feed lines so that an additional transmission zero is produced, which enhance the selectivity. The dual‐band BPF operating at 2.4 and 3.5 GHz for WLAN and WIMAX applications is designed and fabricated. Measurement results agree well with the simulated results. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2692–2695, 2013
A compact dual‐band folded‐slot antenna for WLAN application
Authors: Long Zheng , Guangming Wang , Yajun Hu , Zhao Zhang 
Published: August 2013

ABSTRACTIn this article, a coplanar waveguide ‐fed miniaturization folded‐slot antenna for wireless local area network application is proposed. The two operating bands are achieved by folded‐slot antenna with slot loading. The parametric analysis of the antenna is done by the available electromagnetic solver HFSS11. The proposed antenna is developed, and its measured characteristics are in good agreement with the simulated results. The measured impedance bandwidth for 10‐dB return loss at 2.4 and 5.5 GHz operating band are 90 MHz (2.40–2.49 GHz) and 950 MHz (5.1–6.05 GHz), respectively. Furthermore, the antenna has a simple planar structure and occupies a small size of about 28 × 30 mm2. The antenna also shows good radiation and stable antenna gains across the operating band. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2753–2756, 2013
Design of miniaturized branch‐line coupler based on novel spiral‐interdigital resonator cells
Authors: Guo‐Cheng Wu , Guang‐Ming Wang , Bo Sun , Ya‐Wei Wang 
Published: August 2013

ABSTRACTA miniaturized branch‐line coupler operated at 2.15 GHz, which is based on the novel spiral‐interdigital resonator cells, is proposed in this letter. The electromagnetic characteristics of the novel spiral‐interdigital resonator cell are analyzed by simulator and equivalent circuit model, and the results prove that it has a frequency with phase of −90° in the passband. Then, the proposed branch‐line coupler is designed, fabricated, and measured; the measured and simulated results are in good agreement, showing that this proposed branch‐line coupler has good electromagnetic performances. Moreover, the whole size of the proposed branch‐line coupler is 11.55 × 18.6 mm2, which is only 27.6% of the conventional one, and the miniaturization has realized effectively. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2750–2753, 2013
Aperture coupled BaTiO3 based dielectric resonator antenna with dual‐band
Authors: Oliveira Elder E. C. , D'Assunção Adaildo Gomes , Oliveira Joao B. L. , Cabral Alciney M. , Assis Pedro C. , Vieira Marcelo S. 
Published: August 2013

ABSTRACTA low profile and dual band rectangular dielectric resonator antenna (DRA) based on high permittivity BaTiO3 is proposed. The antenna main characteristics are investigated for wireless communication system applications at the frequency band from 6.0 to 8.0 GHz. The antenna design is performed using Ansoft HFSS through the finite element method. Antenna prototypes are built and measured on a vector network analyzer (R&S ZVB14 model) for comparison purpose. Agreement between simulated and measured results is observed. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2759–2763, 2013
A dual‐band array antenna using dome‐shaped radiating patches
Authors: Dewan Raimi , Rahim Sharul Kamal Abdul , Malek Fareq , Ausordin Siti Fatimah , Yusuf Abdulrahman Amuda , Azemi Saidatul Norlyana 
Published: August 2013

ABSTRACTA novel design of a dual‐band array antenna for Wireless Local Area Network and Worldwide Interoperability for Microwave Access applications is presented in this article. The antenna operates at 3.5 dBi (the lower band) and 5.8 GHz (the upper band), with gains of 7.8 and 5.5 dBi, respectively. The corresponding percentage bandwidths are 2.85 and 2.40%. The overall length of the feeding network was reduced significantly because the elements in the array are closer to each other, with a separation of less than λeff/4. There is good agreement between simulation and measurement results. The results of the surface current study also are presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2680–2686, 2013
A Q‐band 4‐bit active phase shifter using 0.13 μm CMOS technology
Authors: Kim Ji‐Hoon , Lee Jong‐Wook 
Published: August 2013

ABSTRACTA four‐bit phase shifter has been designed and fabricated for millimeter‐wave CMOS phase array systems. Instead of using the conventional approach in which lossy switches are used for different phase path selections, we realize phase shifting by summing two quadratures having variable amplitude. Phase shifting is performed in 22.5° steps by using two variable gain amplifiers optimized for a wide phase‐control range. The realized active phase shifter achieves the measured root‐mean‐square (rms) phase error of <11.5° over frequencies from 39 to 42 GHz. The power consumption of the active phase shifter is 238 mW from a 2.4 V supply voltage. A three‐stage cascode gain amplifier is also designed to improve the overall gain of the phase shifter. The gain amplifier achieves a peak gain of 11.5 dB at 39 GHz with power consumption of 53 mW. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2676–2680, 2013
ERRATUM: A miniaturized branch‐line coupler using triangular patch type artificial transmission line
Authors: Oh Song‐Yi , Hwang Hee‐Yong 
Published: August 2013

ABSTRACTOriginally published Microwave Opt Technol Lett 55:1718–1721, 2013; © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2813, 2013
Thermal stability of lysozyme as a function of ion concentration: A reappraisal of the relationship between the Hofmeister series and protein stability
Authors: Bye Jordan W. , Falconer Robert J. 
Published: August 2013

AbstractAnion and cation effects on the structural stability of lysozyme were investigated using differential scanning calorimetry. At low concentrations (<5 mM) anions and cations alter the stability of lysozyme but they do not follow the Hofmeister (or inverse Hofmeister) series. At higher concentrations protein stabilization follows the well‐established Hofmeister series. Our hypothesis is that there are three mechanisms at work. At low concentrations the anions interact with charged side chains where the presence of the ion can alter the structural stability of the protein. At higher concentrations the low charge density anions perchlorate and iodide interact weakly with the protein. Their presence however reduces the Gibbs free energy required to hydrate the core of the protein that is exposed during unfolding therefore destabilizing the structure. At higher concentrations the high charge density anions phosphate and sulfate compete for water with the protein as it unfolds increasing the Gibbs free energy required to hydrate the newly exposed core of the protein therefore stabilizing the structure.
Genistein versus ICI 182, 780: An ally or enemy in metastatic progression of prostate cancer
Authors: Nakamura Hisae , Wang Yuwei , Xue Hui , Romanish Mark T. , Mager Dixie L. , Helgason Cheryl D. , Wang Yuzhuo 
Published: August 2013

AbstractBACKGROUNDAndrogen signalling through the androgen receptor (AR) plays a critical role in prostate cancer (PCa) initiation and progression. Estrogen in synergy with androgen is essential for cell growth of the normal and malignant prostate. However, the exact role that estrogen and the estrogen receptor play in prostate carcinogenesis remains unclear. We have previously demonstrated the metastasis‐promoting effect of an estrogen receptor beta (ERβ) agonist (genistein) in a patient‐derived PCa xenograft model mimicking localized and metastatic disease.METHODSTo test the hypothesis that the tumor‐promoting activity of genistein was due to its estrogenic properties, we treated the xenograft‐bearing mice with genistein and an anti‐estrogen compound (ICI 182, 780) and compared the differential gene expression using microarrays.RESULTSUsing a second xenograft model which was derived from another patient, we showed that genistein promoted disease progression in vivo and ICI 182, 780 inhibited metastatic spread. The microarray analysis revealed that the metallothionein (MT) gene family was differentially expressed in tumors treated by these compounds. Using qRT‐PCR, the differences in expression levels were validated in the metastatic and non‐metastatic LTL313 PCa xenograft tumor lines, both of which were originally derived from the same PCa patient.CONCLUSIONSTogether our data provide evidence that genistein stimulates and ICI 182, 780 inhibits metastatic progression, suggesting that these effects may be mediated by ERβ signalling. Prostate 73:1747–1760, 2013. © 2013 Wiley Periodicals, Inc.
Opposite effects of tamoxifen on metabolic syndrome‐induced bladder and prostate alterations: A role for GPR30/GPER?
Authors: Comeglio P. , Morelli A. , Cellai I. , Vignozzi L. , Sarchielli E. , Filippi S. , Maneschi E. , Corcetto F. , Corno C. , Gacci M. , Vannelli G.B. , Maggi M. 
Published: August 2013

AbstractBACKGROUNDBPH and LUTS have been associated to obesity, hypogonadism, and metabolic syndrome (MetS). MetS‐induced prostate and bladder alterations, including inflammation and tissue remodeling, have been related to a low‐testosterone and high‐estrogen milieu. In addition to ERs, GPR30/GPER is able to mediate several estrogenic non‐genomic actions.METHODSSupplementing a subgroup of MetS rabbits with tamoxifen, we analyzed the in vivo effects on MetS‐induced prostate and bladder alterations. The effects of selective ER/GPER ligands and GPER silencing on prostate inflammation were also studied in vitro using hBPH cells.RESULTSERα, ERβ, and PR expression was upregulated in MetS bladder, where tamoxifen decreased ERα and PR expression, further stimulating ERβ. In addition, tamoxifen‐dosing decreased MetS‐induced overexpression of inflammatory and tissue remodeling genes. In prostate, sex steroid receptors, pro‐inflammatory and pro‐fibrotic genes were upregulated in MetS. However, tamoxifen did not affect them and even increased COX‐2. In hBPH cells, 17β‐estradiol increased IL‐8 secretion, an effect blunted by co‐treatment with GPER antagonist G15 but not by ER antagonist ICI 182,780, which further increased it. GPER agonist G1 dose‐dependently (IC50 = 1.6 nM) induced IL‐8 secretion. In vitro analysis demonstrated that GPER silencing reverted these stimulatory effects.CONCLUSIONSGPER can be considered the main mediator of estrogen action in prostate, whereas in bladder the mechanism appears to rely on ERα, as indicated by in vivo experiments with tamoxifen dosing. Limiting the effects of the MetS‐induced estrogen action via GPER could offer new perspectives in the management of BPH/LUTS, whereas tamoxifen dosing showed potential benefits in bladder. Prostate 74:10–28, 2014. © 2013 Wiley Periodicals, Inc.