bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Search for New Three‐, Four‐Component Petasis, Passerini, Hantzsch, Kabachnic—Fields, Ugi Reactions with Organic Compounds of Phosphorus, Arsenic, Antimony and Bismuth
Authors: Zhakenovich Aibassov Erkin , Stepanovna Yemelyanova Valentina , Vladimirovna Shakieva Tatyana , Kuandykovich Tussupbaev Nessipbay , Vladimirovich Blagikh Evgeniy 
Published: December 2014

AbstractReview: 10 refs.
ChemInform Abstract: First Principle Chemical Kinetics in Zeolites: The Methanol‐to‐Olefin Process as a Case Study
Authors: Van Speybroeck Veronique , De Wispelaere Kristof , Van der Mynsbrugge Jeroen , Vandichel Matthias , Hemelsoet Karen , Waroquier Michel 
Published: December 2014

AbstractReview: 214 refs.
Sling suspension using the anterior third of the temporalis muscle extended with tendon graft to correct oral incontinence after free flap reconstruction in cases of a major defect of the lower lip muscle
Authors: Huang Tsung‐Chun , Li Tzong‐Shiun , Weng Hui‐ching , Liu Ka‐Wai , Pedro Ciudad , Yeo Matthew Sze‐Wei , Chen Hung‐Chi 
Published: December 2014

ABSTRACTBackgroundOral incontinence is a common complication after free flap reconstruction after ablation of oral cancers. The postoperative incontinence was corrected with strong suspension to the temporalis muscle in cases of major or total defect of lower lip muscles.MethodsEight patients with oral cancer with previous skin flaps for reconstruction of the lower lip had incontinence because of major or total loss of the lower lip muscle. A tendon graft was used as a suspension sling sutured to the anterior third of the bilateral temporalis muscle.ResultsOral continence without drooling was achieved by suspension of the temporalis muscle with free movement of the lower lip.ConclusionThis is a good option for correcting the incontinence after major or total loss of lower lip muscles in patients with oral cancer. © 2015 Wiley Periodicals, Inc. Head Neck 38: 683–688, 2016
Enhancement of Thulium–Ytterbium doped fiber laser efficiency using dual‐pumping method
Authors: Saidin N. , Harun S. W. , Ahmad H. , Ali S. M. M. , Damanhuri S. S. A. , Halder A. , Paul M. C. , Das S. , Pal M. , Bhadra S. K. 
Published: December 2014

ABSTRACTPerformance enhancement of laser acquired from a newly developed double‐clad Yb3+/Tm3+ codoped fiber (YTDF) is demonstrated using dual‐pumping scheme. The laser uses a 2 m long YTDF fiber with a core dopant concentrations (in wt%) of 2.00 Yb2O3, 0.5 Tm2O3, 1.0 Al2O3, and 3.00 Y2O3 as a gain medium in conjunction with a pair of fiber Bragg grating in a linear cavity resonator to generate lasing at 1901.6 nm. The best efficiency of 2.9% and the highest output power of 27 mW are obtained by combining 927 nm pump with 905 nm pump. As compared to a single pumping scheme using 927 nm pumping source, about 0.43% increment in efficiency is observed with no evidence of rollover at the highest output power. The best combination is to use 200 mW of 800 nm pump with 927 nm pump, wherein only a total pump power of 1900 mW is required to generate 20 mW of 1.9 μm laser output. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:285–287, 2015
Design of planar inverted‐F antenna over uniplanar EBG structure for laptop mimo applications
Authors: Soliman Ahmed M. , Elsheakh Dalia M. , Abdallah Esmat A. , El‐Hennawy Hadia 
Published: December 2014

ABSTRACTThree uniplanar shapes of electromagnetic band gap (EBG) structure as T‐shape, fractal shape, and interdigital capacitors are investigated for antenna applications. The proposed EBG shapes are etched on the ground plane of the planar inverted‐F antenna (PIFA) to improve the impedance bandwidth, reduce the antenna size, increase the gain, and improve radiation pattern. Next, two trapezoidal shaped slots are etched on the radiating plate of PIFA antenna to excite two resonant frequencies. The proposed antenna is designed to cover two narrow bands at GSM 1.8 GHz, upper WLAN 5.2 GHz and a wideband from 2.4 to 4 GHz. Effect of the laptop is investigated on the performance of the proposed antenna. Finally, the effect of these new EBG shapes on mutual coupling reduction between two pair of antennas is studied for multiple input multiple output application in laptop device. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:277–285, 2015
Novel design of a CPW‐FED monopole antenna with three arc‐shaped strips for WLAN/WiMAX operations
Authors: Jo Gyo Jin , Mun Seung Min , Im Dae Soo , Kim Gi Rae , Choi Yeong Gyu , Yoon Joong Han 
Published: December 2014

ABSTRACTIn this article, a novel coplanar waveguide (CPW)‐fed triple‐band antenna for WLAN/WiMAX is proposed. The proposed antenna is simply composed of three arc‐shaped strips and is capable of generating three separate resonant modes with good impedance matching conditions. The effects of varying the dimension on the proposed antenna performance were also studied. Prototypes of the proposed antenna were constructed and experimentally studied. The experiment results show that the proposed antenna covers 1.66–2.71, 2.95–4.54, and 5.02–6.10 GHz with −10 dB return loss, covering all the 2.4/5.5/5.8 WLAN bands and 2.5/3.5/5.5 GHz bands. Furthermore, this CPW‐fed monopole antenna exhibits a nearly omnidirectional radiation pattern in the H‐plane and a dipole‐like radiation pattern in the E‐plane. Also, good antenna gains for operating bands were obtained. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:268–273, 2015
Compact frequency selective surface with dual band response for WLAN applications
Authors: da Silva Segundo F. C. G. , Campos A. L. P. S. 
Published: December 2014

ABSTRACTIn this article, the authors propose the use of conducting patches with slots to design frequency selective surfaces (FSS) with dual bandstop for wireless LAN (WLAN) applications. The simulated results were obtained with the computer program Ansoft Designer™. A prototype of the designed FSS was built and its transmission characteristics were measured. Excellent agreement between simulated and measured results was obtained. The FSS was useful for rejecting signals from industrial, scientific, and medical and unlicensed national information infrastructure bands and it presented angular stability. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:265–268, 2015
A simple approach to achieve polarization diversity in broadband reflectarrays using single‐layered rectangular patch elements
Authors: Guo Lu , Tan Peng‐Khiang , Chio Tan‐Huat 
Published: December 2014

ABSTRACTThis article presents a simple method to realize polarization diversity in broadband reflectarrays. The wideband characteristic of the reflectarray is achieved using rectangular patch elements arranged in a subwavelength grid on a single layer of substrate; while the polarization diversity of the reflectarray is obtained by simply rotating the feed horn antenna. As the two orthogonal x‐ and y‐component of the rectangular patch element demonstrate relatively negligible interaction, the circular polarized (CP) reflectarrays with linearly polarized feed that have been proposed previously are found to be capable of supporting quadruple polarizations by means of rotating the feed. Based on the rectangular patch elements, an offset‐fed 405 × 405 mm2 reflectarray with 0.3λ grid and centered at 10 GHz is designed and developed for right‐hand circular polarization (RHCP). In an effort to realize the polarization diversity, the feed horn antenna is subsequently rotated relative to the array with angles of 0°, 90°, and 135° for vertical polarization, horizontal polarization, and left‐hand circular polarization (LHCP), respectively. The viability and effectiveness of the proposed simple method for polarization diversity is experimentally verified. The measured results show that the 1‐dB gain bandwidth for all four polarizations can reach as large as 18%. Furthermore, the 3‐dB axial ratio bandwidths for CP operations are remarkably wide, above 36% and 40% for RHCP and LHCP, respectively. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:305–310, 2015
A low‐power, high‐gain, and low‐noise 5–6 GHz CMOS low‐noise amplifier with excellent reverse isolation for IEEE 802.11 n/ac WLAN applications
Authors: Lin Yo‐Sheng , Liu Run‐Chi 
Published: December 2014

ABSTRACTA low power, high gain, and low‐noise figure (NF) 5–6 GHz low‐noise amplifier (LNA) with excellent reverse isolation in a cost effective 0.18 μm CMOS technology is reported. To achieve sufficient power gain (S21) and reverse isolation (S12), the LNA comprises an inductive source‐degeneration cascode stage followed by a cascode stage. The LNA consumes 7.99 mW, achieving high S21 of 19 ± 1.5 dB for frequencies of 5.1–6.2 GHz and excellent S12 of −67.9 to −73.3 dB for frequencies of 5–6 GHz. In addition, the LNA achieves minimum NF of 2.8 dB at 5.5 GHz and NF of 2.91 ± 0.11 dB for frequencies of 5–6 GHz, one of the best NF results ever reported for a 5‐GHz‐band CMOS LNA. To verify the 5‐GHz LNA, a test IEEE 802.11 wireless local area network (WLAN) transceiver based on the LNA is also designed and implemented. The measured results show that for the 24 channels in 5‐GHz band, the average sensitivity is −77 and 3 dBm better than that (−74 dBm) of the conventional one. A conventional one means the 802.11 WLAN controller in this work is replaced by a commercial RTL8812AR‐VN WLAN controller. In addition, the average error vector magnitude of received IQ data is −32 dB (or 2.5%), 2.5 dB (or 0.8%) better than that (−29.5 dB [or 3.3%]) of the conventional one. The impressive results from this work indicate the high potential of the proposed LNA in 5‐GHz WLAN applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:296–304, 2015
EIT in hollow‐core fibers for optical communications devices
Authors: Tiburcio Bruno D. , Fernandes Gil M. , Monteiro Jorge , Rodrigues Silvia , Ferreira Mario , Facão Margarida , Carvalho M. Inês , Pinto Armando N. 
Published: December 2014

ABSTRACTWe developed an experimental setup for electromagnetically induced transparency able to manufacture microcells, suitable for optical fiber communications technology. A hollow‐core photonic crystal fiber (HC‐PCF) is filled with acetylene, to work in the 1500 nm telecommunications window. We used a HC‐PCF with the mode‐field diameter compatible with standard single‐mode fibers, with the purpose of achieving low‐loss splicing and enabling us to work at low pumping powers. This allows to induce a narrow transparency window, which can be spectrally adjusted and dynamically controlled. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:348–352, 2015
Small size tripleband monopole antenna with a parasitic element
Authors: Sim Chow‐Yen‐Desmond , Chen Horng‐Dean , Yeh Chih‐Husan , Lin Hen‐Lun 
Published: December 2014

ABSTRACTA small size (20 × 38.5 × 0.8 mm3) coplanar waveguide (CPW)‐fed monopole antenna for wireless local area network and worldwide interoperability for microwave access applications is proposed. To achieve tripleband operation, the proposed monopole antenna is designed with a modified symmetrical U‐shaped printed structure attached with a parasitic element behind it. Good impedance matching is also attained by loading two dissimilar notches separately into the two CPW ground planes. The measured 10‐dB impedance bandwidths of the three operating bands (fL, fM, and fH) are 16.96% (2.105–2.495 GHz), 28.72% (3.22–4.30 GHz), and 23.32% (4.895–6.125 GHz), respectively, and all bands of interest have yielded peak gain and radiation efficiency of more than 2.7 dBi and 65%. Detail process of designing the proposed antenna is explicitly shown, and vital parametric studies were also conducted by simulation. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:342–348, 2015
Estimation of resonant frequency and bandwidth of compact unilateral coplanar waveguide‐fed flag shaped monopole antennas using artificial neural network
Authors: Gunavathi N. , Sriramkumar D. 
Published: December 2014

ABSTRACTNeural network based estimation of resonant frequency and bandwidth of compact unilateral coplanar waveguide (CPW)‐fed flag shaped printed monopole antennas is presented. The proposed antennas are similar to CPW‐fed antenna; however, by replacing unilateral CPW feed instead of CPW feed, compactness of about 48.615 percent is achieved. These are designed on an inexpensive FR4‐epoxy substrate with dielectric constant of 4.4 and thickness of 1.6 mm. Resonant frequencies and bandwidths of the flag shaped antennas with different dimensions are computed using method of moment electromagnetic solver IE3D 15.10 and they have been given as training and test data for the proposed multilayered perceptron feed forward neural network with Levenberg–Marquardt training algorithm to estimate the resonant frequency and bandwidth of the proposed antennas. The estimated values of resonant frequency and bandwidth with average percentage of error are 1.275 and 0.325, respectively. For verification, the proposed antenna is fabricated and measured with resonant frequency 5.78 GHz and bandwidth of 1.0 GHz for HiperLAN/2 and IEEE802.11a applications. It has impedance bandwidth from 5.0 to 6.0 GHz for return loss lower than −10 dB and good omnidirectional radiation performance over entire frequency range, with a compact size of 11.07 × 27.5 × 1.6 mm3. Various features such as compactness, simple geometry, and low cost, uniplanar structure make the antennas suitable for modern wireless communication systems. This approach replaces the use of very complicated analysis. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:337–342, 2015
Coupled microstrip line Wilkinson power divider with compensating capacitor
Authors: Wang Xiaolong , Ma Zhewang , Yoshikawa Masayuki 
Published: December 2014

ABSTRACTIn this article, π/4 coupled microstrip line is used in the design of two‐way Wilkinson power divider for compact circuit size. A capacitor is shunted to compensate the phase velocities between even and odd mode in coupled microstrip line and its position can be placed arbitrary in the coupled microstrip line. The capacitance value is determined by effective dielectric constants of substrate, coupling strength, and its position in the coupled microstrip line. Design charts, frequency responses, calculated bandwidths, and several design examples are presented. In experiment, one circuit was fabricated, the measurement results showed good agreement with theoretical results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:328–332, 2015
Design of a compact CPW‐feed asymmetric elliptical slot ultrawideband antenna for high gain
Authors: Kushwaha Nagendra , Kumar Raj 
Published: December 2014

ABSTRACTA compact, CPW‐feed slot antenna for ultrawideband applications is proposed. The antenna uses an elliptical patch as radiating element and an asymmetric slotted ground plane to provide a measured usable bandwidth of 120% (2.81–11.2 GHz). The asymmetric slot in the ground plane creates an extra inductive reactance which neutralizes the capacitive effect of the open ended elliptical patch and results into wider impedance matching. To improve the gain of the proposed antenna, a three metallic layer frequency selective surfaces (FSSs) of overall thickness 3.5 mm and with a stop band (transmission < −20 dB) of 8.3 GHz (2.6–10.9 GHz) is proposed. With the FSS, there is a 4–5 dBi improvement in the antenna peak gain and the back lobes are reduced by around 10 dBi. The measured and simulated results are in good agreement. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:314–319, 2015
A modified unequal power divider with a complex isolation component for enhanced isolation
Authors: Kim Young , Yoon Young‐Chul 
Published: December 2014

ABSTRACTThis article presents a modified unequal power divider with a complex isolation component for enhanced physical and electrical isolation between output ports. In the proposed power divider, the complex isolation component is positioned at an arbitrary phase angle inside a quarter‐wave transmission line. A theoretical analysis is performed to derive the design equations for the proposed unequal power divider. For validating the performance of the proposed unequal power divider, samples of the device operating at the center frequency of 2 GHz were fabricated and tested. The test results are in good agreement with the simulation results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:322–324, 2015
An investigation on transient effects in EDFA with variable duty cycle and wavelength multiplexed signals
Authors: Dasan Meena , Thodiyil Sarath , Francis Fredy , Elambilayi Dipin , Talabattula Srinivas 
Published: December 2014

ABSTRACTThe advent of erbium doped fiber amplifiers (EDFA) has revolutionized optical communication in the past few decades. Traditionally, it was being used with relatively high bitrates system for amplification in the optical domain. The slow gain response of EDFA is inherently resistant to transient effects from bit rate and duty cycle variations in high bit rate optical systems. We investigate the transient effects of EDFA on low bitrate systems with variable duty cycle and pump power configurations. Also, the effect of transients in WDM multirate systems has been investigated. The work is supported with both simulation and experimental results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:352–356, 2015
Design of compact patch antenna based on metamaterial for WiMAX applications with circular polarization
Authors: Kuhestani Hamed , Rahimi Maryam , Mansouri Zahra , Zarrabi Ferdows B. , Ahmadian Rahele 
Published: December 2014

ABSTRACTIn this article, compact antenna with high gain and circular polarization (CP) for WiMAX applications is noticed. Using metamaterials with negative permittivity and permeability improves the antenna parameters; thus, the prototype antenna is designed based on metamaterial composite right‐/left‐handed to achieve CP and compact size. The final antenna has directional pattern and high gain with CP at 3450 MHz. The antenna gain is 8.28 dBi. The size of prototype patch antenna is 30
30 mm2. It is designed and fabricated on Taconic TLY‐5, Laminate substrate with εr = 2.2 and thickness of 1.6 mm. It is simulated by CST microwave studio and HFSS. Also, equivalent circuit and experimental results are presented and compared here. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:357–360, 2015
Experimental radiation characteristics of micromachined terahertz low‐profile corrugated horn antenna
Authors: Lu Hong‐da , Lv Xin , Gao Zi‐jian , Liu Yong 
Published: December 2014

ABSTRACTA terahertz (THz) low‐profile corrugated horn antenna is proposed. This antenna consists of WR2.2 feeding waveguide, pyramidal horn, and four V‐grooves, integrated fabricated by silicon micromachining. The grooves significantly enhance the gain and maintain the low profile of original horn antenna. The measured results from 480 to 500 GHz show the gain above 15.6 dB and the narrow beamwidths without sidelobe, agreeing well with simulated results and indicating the potential to be applied in compact array of THz imaging and detection systems. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:364–367, 2015
Biased gates CMOS resistive ring mixer
Authors: Amiri Parviz , Tabatabaei Babak Shojaei 
Published: December 2014

ABSTRACTA biased gates passive resistive ring mixer with integrated baluns in 0.18‐μm CMOS Taiwan Semiconductor Manufacture Company (TSMC) process is reported. The mixer shows 10% improvement compared with the mixer without biased gates. This is the first circuit report of biased gates resistive ring mixer with integrated baluns. The circuit has been designed and optimized for 2.4 GHz RF frequency and for applying in the contactless heart rate extraction system using microwave Doppler radar. The circuit has the conversion loss of 8.36 dB for 2.4 GHz frequency and indicates 17% improvement compared to the similar types without gate biasing have been reported so far. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:388–391, 2015
A compact dual‐polarized cavity‐backed annular slot antenna for indoor mimo systems
Authors: Li Wei‐Wen , Wang Chen , Lai Yun‐Qing , Zhou Jian‐Hua 
Published: December 2014

ABSTRACTA unidirectional, dual‐polarized multi‐input multi‐output (MIMO) antenna is designed for indoor 2.4‐GHz WLAN application. The proposed antenna consists of a cavity‐backed annular slot and two inverted microstrip fed lines which are mutually orthogonal. To further suppress the cross polarization levels and enhance the ports isolation, two grounded strips, being opposite to the microstrip lines of the same size, are introduced above the annular slot. Meanwhile, a conductor pillar is loaded into the back cavity. The experimental results show that this antenna has the ports isolation of more than 28 dB and the cross‐polarized levels of less 30 dB than the copolarization over the working band. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:384–388, 2015
Broadband circularly polarized antenna with high gain and wide axial ratio beamwidth
Authors: Wang Hao , Wang Xiang , Liu Shu Fang , Li Ping , Shi Xiao Wei 
Published: December 2014

ABSTRACTA broadband circularly polarized (CP) antenna with simple structure and wide angular coverage is proposed. The interlaced coplanar dipole is excited by a coaxial cable to achieve the CP wave. To obtain a high gain and low backward radiation, a rectangular cavity‐backed reflector is used. An initial design at around 6.0 GHz is presented to show the performance of this configuration. An impedance bandwidth and axial ratio bandwidth of about 35.6 and 33.5% can be achieved at this frequency. Also, a stable gain of about 10 ± 0.5 dBi and a wide axial ratio beamwidth of about 200° over the frequency of interest are obtained. Then, a parametric analysis is conducted to estimate the significance of the design parameters that affect the antenna's performance. Finally, a prototype at 11.0 GHz is fabricated to validate the design. The measured results are in good agreement with the simulated ones, which shows that the design can be easily applied to other frequency and that the design may be a good candidate for the CP antenna family. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:377–381, 2015
Compact lowpass filter with wide stopband bandwidth
Authors: Chen Xianhong , Zhang Lijun , Peng Yatao , Leng Yongqing , Lu Hui , Zheng Zhanqi 
Published: December 2014

ABSTRACTA compact microstrip lowpass filter (LPF) which consists of a meander line, a coupled line and two open stubs is proposed. The mechanism for reallocating filter transmission zeros and the design procedure are explained. The simulated and measured results demonstrate that this LPF provides compact size, low insertion loss, and wide stopband. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:367–371, 2015
Doherty power amplifier with enhanced in‐band load modulation for 100 MHz LTE‐advanced application
Authors: Xia Jing , Zhu Xiaowei 
Published: December 2014

ABSTRACTThis article presents a modified GaN Doherty power amplifier (PA) for 100 MHz long‐term evolution (LTE)‐advanced application at 2.5 GHz. To improve load modulation and consistency of the output power and efficiency in the operation bandwidth, a method was proposed by choosing optimal load impedances in Class C mode, properly increased gate bias voltage and optimized input matching network for the design of the peaking amplifier. When driven with 100 MHz LTE‐advanced signals, the designed PA achieves adjacent channel leakage ratio of −49 dBc after digital predistortion at 9 dB back‐off output power of about 40.5 dBm with efficiency of 42%. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:391–395, 2015