bluuebunny/crossref_metadata_2025_split huggingface dataset:
The design and performance analysis of integrated amplifier patch antenna
Authors: Kaya Adnan , Çömlekçi Selçuk 
Published: July 2008

AbstractThis work presents the design of an active amplifier antenna. Active integrated antennas can be obtained with active components directly connected to the antenna structure. In this article, a novel active integrated single microstrip antenna analysis and its radiation pattern and gain performance is proposed. A high‐efficiency, low noise, and high linear compact amplifier integrated with a microstrip antenna at 1.6 GHz is presented for RF front‐end circuit applications. The design in this study consists of a rectangular microstrip antenna with a pair of parallel slots loaded close to the radiating edge of the patch and three meandering narrow slots embedded in the antenna surface. With the proposed design a size reduction of 34% for the 1.6‐ and 2.6‐GHz resonant frequencies is obtained and the two frequencies have an operation frequency ratio of 1.30. In this design approach, the measured antenna impedance is transformed with matching to the load impedance for maximum efficiency. With the proposed amplifier antenna design, the antenna radiation pattern can be better than an antenna radiation pattern without matching. In addition, it has been shown that compensation significantly improves the return loss matching level. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2732–2736, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23765
Design of a dual‐band V‐shaped monople antenna for DCS/2.4‐GHz WLAN operations
Authors: Rmili Hatem , Floc'h Jean‐Marie. 
Published: July 2008

AbstractIn this article, we present a simple surface‐mountable monopole antenna for dual‐band DCS1800 and 2.4‐GHz WLAN operations. The antenna was obtained by folding a metallic strip into a V‐shape, and soldered to a 50‐Ω microstrip feed line printed on a metallized substrate. The proposed antenna shows an easy control of the desired lower and upper bands by adjusting separately the length of the two metallic strips. Details of the proposed antenna design are described, and both simulated and experimental results are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2615–2617, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23766
A dual‐band printed dipole antenna for IMT‐2000 and 5‐GHz WLAN applications
Authors: Rmili Hatem , Floc'h Jean‐Marie , Besnier Philippes , Drissi Mohamed 
Published: July 2008

AbstractA dual and wide‐band printed dipole antenna is presented for IMT‐2000 and 5.2/5.4/5.8‐GHz WLAN applications. The proposed balun‐fed antenna consists of a double‐sided printed dipole antenna with a microstrip‐fed disk‐dipole printed on the top side of the substrate, and a modified annular‐ring dipole and the ground plane printed on the bottom side. For the proposed antenna, two resonant bands are observed. The first band is about 14.2% for the center frequency of 2.1 GHz and the second band extends from 4.1 to 8.1 GHz with a fractional bandwidth of 80%. The measured peak gains over these bands are 1.8 and 3 dBi, respectively. Details of the experimental and simulation results are presented and discussed.© 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2585–2587, 2008; Published online in Wiley InterScience (www.i	nterscience.wiley.com). DOI 10.1002/mop.23767
A low‐power 63‐GHz CMOS direct injection‐locked frequency divider in 0.13‐μm CMOS technology
Authors: Hsu Wei‐Lun , Chen Chang‐Zhi , Lin Yo‐Sheng 
Published: July 2008

AbstractA low‐power 63‐GHz (V‐band) direct injection‐locked frequency‐divider (ILFD) using standard 0.13‐μm CMOS technology is reported. To reduce power consumption and enhance locking range, a PMOS switch directly coupled to the LC tank (output) of the ILFD is used to replace the traditional tail transistor for injection path. This ILFD architecture also features a very low input capacitance; thus, high operating frequency of 63 GHz can be achieved. This direct ILFD consumes 5.79 mW with locking range of 1.86 GHz (61.24–63.1 GHz). The chip area was only 0.585 × 0.38 mm2 excluding the test pads. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2581–2584, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23768
Half‐wavelength loop strip capacitively fed by a printed monopole for penta‐band mobile phone antenna
Authors: Chi Yun‐Wen , Wong Kin‐Lu 
Published: July 2008

AbstractIn this study, a novel internal penta‐band antenna formed by a half‐wavelength loop strip capacitively fed by a printed monopole for mobile phone application is proposed. The antenna is configured such that, inside the antenna region, possible electronic elements, such as the speaker or the like, can be embedded to achieve a compact integration of the antenna inside the mobile phone; moreover, the antenna performances can be very slightly affected by the integrated element. The antenna can further generate two wide resonant modes at about 900 and 1900 MHz for GSM850/900 and DCS/PCS/UMTS operation, respectively. In addition, the two resonant modes can generally be controlled separately, with the lower one controlled by the loop strip operated as a 0.5‐wavelength structure and the upper one controlled by the printed monopole operated as a 0.25‐wavelength structure. Detailed design considerations of the proposed antenna are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2549–2554, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23769
20‐W average power, high repetition rate, nanosecond pulse with diffraction limit from an all‐fiber MOPA system
Authors: Du Songtao , Zhou Jun , Zhang Fangpei , Feng Yutong , Lou Qihong , Chen Weibiao 
Published: July 2008

AbstractIn this article, we report an all‐fiber master oscillator power amplifier (MOPA) system, which can provide high repetition rate and nanosecond pulse with diffraction‐limit. The system was constructed using a (2 + 1) × 1 multimode combiner. The Q‐Switched, LD pumped Nd:YVO4 solid‐state laser was used as master oscillator. The 976‐nm fiber‐coupled module is used as pump source. A 10‐m long China‐made Yb3+‐doped D‐shape double‐clad large‐mode‐area fiber was used as amplifier fiber. The MOPA produced as much as 20‐W average power with nanosecond pulse and near diffraction limited. The pulse duration is maintained at about 15 ns during 50–175 kHz. The system employs a simple and compact architecture and is therefore suitable for the use in practical applications such as scientific and military airborne LIDAR and imaging. Based on this system, the amplification performances of the all‐fiber amplifier is investigated. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2546–2549, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23770
Artificial neural network applications in improved noise wave modeling of microwave FETs
Authors: Marinković Zlatica D. , Pronić‐Rančić Olivera , Marković Vera 
Published: July 2008

AbstractAn application of artificial neural networks (ANNs) for accuracy improving of the microwave FETs (MESFET/HEMT, dual‐gate MESFET) noise modeling is presented in this paper. The proposed model is based on a basic transistor noise wave model, whose noise wave temperatures are assumed to be constant over the operating frequency range. A multilayer perceptron ANN is included in the model in order to adjust values of the noise parameters obtained by the original wave model to be more accurate. Numerical examples for noise parameters modeling are presented to show the validity and effectiveness of this approach. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2512–2516, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23771
Broadband spatial band‐stop filter using Sierpinski space‐filling geometry at PCS band
Authors: Kim Dongho , Yeo Junho , Choi Jaeick 
Published: July 2008

AbstractIn this letter a broadband spatial band‐stop filter using Sierpinski space‐filling geometry (SSG) operating at Korean personal communication service (PCS) frequency band (1.75–1.87 GHz) is presented. A single layer frequency selective surface (FSS) consisting of SSG of iteration Level 4 is first designed and its transmission characteristic is analyzed. To increase the bandwidth of stop band, two SSG FSS layers are stacked with some spacing in‐between. It shows very wide stop band (over 255 MHz) covering both the uplink and downlink of PCS band and, furthermore, has good angular sensitivity. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2716–2718, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23772
Tunable sharp notch filter for UWB application
Authors: Yamamoto Yasuhisa , Li Keren , Hashimoto Osamu 
Published: July 2008

AbstractThis article presents a novel tunable sharp notch filter using open stub structure with varactor for implementing detect‐and‐avoid method into ultrawideband radio system. On the basis of the experimental results on the open stub structure with lumped capacitor, we introduced two techniques in this work to realize a tunable sharp notch filter using open stub structure with varactor to perform narrow stopband and using resistors to build a DC bias circuit, so that no influence to the tunable notch filter over a wide band. The developed tunable notch filter has excellent performance: wide tuning range from 3.65 to 4.35 GHz with low tuning voltage from 0 to 6 V, narrow bandwidth less than 270 MHz of the notch filter (at 10 dB insertion loss at 0 V), and compact size of the developed filter: about 2.0 cm × 4.0 cm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2712–2715, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23773
Small handset antenna for FM reception
Authors: Aguilar D. , Anguera J. , Puente C. , Ribó M. 
Published: July 2008

AbstractA passive internal handset antenna for FM reception is presented using electromagnetic simulations as well as laboratory experiments. Received signal for the antennas have been demodulated and the quality of the audio signal evaluated. Results have been compared with a long antenna (λ/4) confirming that the proposed solution is a good candidate to migrate to a full wireless FM system that may be integrated into a handset phone. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2677–2683, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23774
Divide‐by‐3 LC injection locked frequency divider with a transformer as an injector's load
Authors: Jang Sheng‐Lyang , Lu Pei‐Xi , Lee C. F. , Juang M.‐H. 
Published: July 2008

AbstractThis letter proposes a new divide‐by‐3 injection‐locked frequency divider (ILFD) fabricated in the 0.35‐μm CMOS 2P4M CMOS technology. The divider consists of a pMOS cross‐coupled LC oscillator, two injection MOSFETs, and a transformer staggered in between the cross‐coupled pMOSFETs and injection FETs, and the LC resonator is composed of two inductors and varactors. The injection FET uses the transformer load to increase the locking range. At the supply voltage of 2 V, the divider free‐running frequency is tunable from 2.433 to 2.79 GHz, and at the incident power of 0 dBm the locking range is about 1.13 GHz (14.9%), from the incident frequency 7.17–8.3 GHz. The core power consumption is 8.64 mW. The die area is 1.36 × 0.8 mm2. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2722–2725, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23775
Compact six‐band internal antenna with stacked periodic‐grooved planes
Authors: Kang Kyung K. , Lee Jae W. , Sik Cho Choon , Lee Taek K. 
Published: July 2008

AbstractThis article deals with a design of compact six‐band internal antenna using two identically stacked periodic‐grooved patches and shorting plates and covering the frequency bands composed of cellular (824–894 MHz), GSM (880–960 MHz), DCS (1710–1880 MHz), PCS (1850–1990 MHz), UMTS (1920–2170 MHz), and ISM (2400–2480 MHz) under the criteria −7.3 dB for the first five bands and −6 dB for the last band, respectively. To accomplish this goal, the planar inverted‐F antenna (PIFA) with periodic grooves is suggested, analyzed, and verified by using two commercially available softwares, CST MWS and HFSS based on the FDTD and FEM algorithms, respectively, and carrying out the measurements in terms of return loss, radiation patterns, and gains. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2718–2722, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23776
Capacitively FED hybrid monopole/slot chip antenna for 2.5/3.5/5.5 GHz WiMAX operation in the mobile phone
Authors: Lai Peng‐Yu , Wong Kin‐Lu 
Published: July 2008

AbstractIn this study, a promising design of the capacitively fed hybrid monopole/slot chip antenna for the 2.5/3.5/5.5 GHz WiMAX (worldwide interoperability for microwave access) operation in the mobile phone is presented. The antenna is printed on a thin FR4 substrate of small size 5.2 × 16 mm2 as a surface‐mount element to be placed at one corner of the system circuit board of the mobile phone. The antenna mainly comprises a resonant monopole patch, a resonant shorter slot, and a matching longer slot; the latter two slots are embedded within the monopole patch to achieve a compact integration. Two wide operating bands centered at about 3.3 and 5.5 GHz are generated through capacitive excitation of the resonant monopole patch and the shorter slot, while the matching longer slot helps to improve the impedance matching over the two operating bands. The lower band covers WiMAX operation in the 2.5 GHz (2500–2690 MHz) and 3.5 GHz (3300–3700 MHz) bands, while the upper band covers the 5.5 GHz (5250–5850 MHz) WiMAX operation. Details of the proposed hybrid monopole/slot chip antenna are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2689–2694, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23777
Performance evaluation of Gunn oscillators for active mode‐locking of erbium doped fiber ring lasers
Authors: Venkitesh Deepa , Tendulkar Shriharsh , Vijaya R. 
Published: July 2008

AbstractA cost‐effective and rugged actively mode‐locked erbium‐doped fiber laser operated at GHz repetition rate is demonstrated with the use of a Gunn oscillator as the RF source for driving the optical modulator. The high power from the Gunn oscillator eliminates the need of an RF driver. The output of the laser in the time domain is processed numerically to predict its modal characteristics in the spectral domain. Experimental results regarding the evaluation of the Gunn oscillator for its suitability in active mode‐locking, tunable operation of the laser in the C‐band using a band pass filter as well as the results on the stability of the laser output in the time and frequency domain are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2684–2688, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23778
An effective equivalent circuit model of slotted ground structures under planar microstrip
Authors: Wu Hung‐Wei , Weng Min‐Hang , Su Yan‐Kuin , Yang Ru‐Yuan , Ye Chang‐Sin 
Published: July 2008

AbstractThis letter presents a effective equivalent circuit model of circular slotted ground structure (SGS) under a planar microstrip, which can be used as a kind of periodic structure. The circular SGS exhibits an electromagnetic band gap or stop band in frequency responses. The proposed equivalent circuit model consists of lumped elements which can be demonstrated as a transformer to model coupling between the microstrip line and the circular SGS. Excellent agreement with electromagnetic (EM), extracted circuit simulations, and measurements is demonstrated. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2651–2653, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23779
Simple and adaptive UHF RFID modulator using defected ground structure and practical measurement on reader‐to‐tag communication
Authors: Jung Jin‐Woo , Roh Hyoung‐Hwan , Park Jun‐Seok 
Published: July 2008

AbstractAn extended work on DGS modulator, which was presented before on Microwave and Optical Technology Letters Society, shall be adaptive performance and practical implementation and measurement. A DGS modulator is motivated from three benefits that can be obtained from defected ground structure; an extensive resonance, size reduction, and excellent stopband characteristic. An extensive resonance via a microstrip ground plane configuration, which includes a varactor diode bridging microstrip transmission line with variable capacitance provision that can be controlled, gives on/off switching and its attenuation level (OOK is a 100%, and which less than 100% can be ASK) that plays the key role of the ASK and OOK modulation process. A varactor diode is under control of a micro control unit that can be controlled by user interface software; therefore, user can monitor communication states while each operational sequence of a varactor diode can be controlled. Sharper phase and more precise data modulation can be achieved after several tuning works and practical trials. A modulation index (about 90–93%) with stable tag responses over the target bands (860–960 MHz, centered 912 MHz) was verified through the practical measurements on the RFID reader communication using ASK. And when a modulation index was nearly 99% (∼98.8%), this is considered to be an OOK. Overall radio communications are with EPC class‐1 Gen2 Type‐B and Type‐C passive tags, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2646–2651, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23780
Even‐ and odd‐order optical sideband suppression modulation using one electro‐absorption modulator in a Sagnac fiber loop
Authors: Ning G. , Aditya S. , Cheng L. H. , Zhou J. Q. , Shum P. 
Published: July 2008

AbstractEven‐ and odd‐order harmonic suppression modulations are demonstrated. The configuration is based on a Sagnac loop interferometer containing a 3 dB coupler, an electro‐absorption modulator (EAM), and a polarization controller. Measured results demonstrate even‐ and odd‐order optical sideband suppressions for both reflected and transmitted signals. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2617–2618, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23781
Anomalies of ulnar nerve conduction in different carpal tunnel syndrome stages
Authors: Ginanneschi F. , Milani P. , Rossi A. 
Published: July 2008

AbstractImpairment of ulnar sensory fibers at the wrist has recently been documented in moderate/severe carpal tunnel syndrome (CTS). This has been interpreted as a consequence of compressive forces transmitted to Guyon's canal by high pressure in the carpal tunnel or comorbidity between ulnar neuropathy and CTS. The main aim of the present study was to identify any ulnar nerve conduction impairment in the early stages of CTS. The relation between ulnar and median nerve conduction in all CTS severity stages was also assessed. Ulnar nerve sensory conduction at the wrist was investigated in 580 hands with CTS. Significant changes in ulnar nerve conduction were present even in the early stages of CTS. A significant, positive correlation was also found between CTS severity and conduction abnormalities of ulnar sensory fibers. These findings make the hypothesis of comorbidity weak. Based on the above results and on reports of high pressure in Guyon's canal in CTS, ulnar nerve conduction abnormalities may be caused in part by compressive forces progressively transmitted to the canal by increasing pressure in the carpal tunnel with increasing CTS severity. This does not exclude other causative factors such as subclinical traumatic damage acting on median and ulnar fibers. Muscle Nerve, 2008
Analysis of the benefits of vitamin cocktails in treating Charcot–Marie–Tooth disease type 1A
Authors: Kaya Ferdinand , Belin Sophie , Micallef Joelle , Blin Olivier , Fontés Michel 
Published: July 2008

AbstractWe recently proposed that the use of high doses of ascorbic acid (AA) could constitute the first potential treatment for Charcot–Marie–Tooth disease type 1A (CMT1A).4 We investigated the potential benefits of using cocktails of vitamins for CMT1A therapy. We used transient transfection of Schwann cells with a construction placing the expression of a reporter gene under the control of the Schwann cell‐specific promoter of PMP22. Transfected cells were cultured with or without addition of ascorbic acid, vitamin A, vitamin E, or a cocktail of these vitamins. Adding vitamin A or E counteracts the effect of ascorbic acid in inhibiting PMP22 expression. We thus recommend that vitamins A and E should not be included in combination with AA in clinical trials. Muscle Nerve, 2008
Fast integration and weight function blending in the extended finite element method
Authors: Ventura Giulio , Gracie Robert , Belytschko Ted 
Published: July 2008

AbstractTwo issues in the extended finite element method (XFEM) are addressed: efficient numerical integration of the weak form when the enrichment function is self‐equilibrating and blending of the enrichment. The integration is based on transforming the domain integrals in the weak form into equivalent contour integrals. It is shown that the contour form is computationally more efficient than the domain form, especially when the enrichment function is singular and/or discontinuous. A method for alleviating the errors in the blending elements is also studied. In this method, the enrichment function is pre‐multiplied by a smooth weight function with compact support to allow for a completely smooth transition between enriched and unenriched subdomains. A method for blending step function enrichment with singular enrichments is described. It is also shown that if the enrichment is not shifted properly, the weighted enrichment is equivalent to the standard enrichment. An edge dislocation and a crack problem are used to benchmark the technique; the influence of the variables that parameterize the weight function is analyzed. The resulting method shows both improved accuracy and optimum convergence rates and is easily implemented into existing XFEM codes. Copyright © 2008 John Wiley & Sons, Ltd.
Numerical approximation of incremental infinitesimal gradient plasticity
Authors: Neff Patrizio , Sydow Antje , Wieners Christian 
Published: July 2008

AbstractWe investigate a representative model of continuum infinitesimal gradient plasticity. The formulation is an extension of classical rate‐independent infinitesimal plasticity based on the additive decomposition of the symmetric strain tensor into elastic and plastic parts. It is assumed that dislocation processes contribute to the storage of energy in the material whereby the curl of the plastic distortion appears in the thermodynamic potential and leads to an additional nonlocal backstress tensor. The formulation is cast into a numerical framework by a saddle point approximation of the corresponding minimization problem in each incremental loading step. This allows one to reformulate the (nonlocal) dissipation inequality to a point‐wise flow rule and yields a solution scheme, which is a direct extension of the standard approach in classical plasticity. Our numerical results show the regularizing effects of the additional physically motivated terms. Copyright © 2008 John Wiley & Sons, Ltd.