bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characteristics of a two‐layer microstrip patch antenna for Bluetooth applications
Authors: Lu Lu , Coetzee Jacob Carl 
Published: February 2006

AbstractA double‐layer rectangular patch microstrip antenna suitable for Bluetooth applications is investigated. The patch is etched on a separate substrate which is suspended above the ground plane and supported by an MCX connector. The air gap between the patch and the ground plane increases the impedance bandwidth and can be used to tune the resonant frequency. This paper presents experimental results on the effects of various parameters on the antenna characteristics and provides guidelines for the design of such an antenna. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 683–686, 2006; Pubished online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21442
Effective and tolerant wide‐range solutions for ultra‐wideband indented‐disk monopole antenna
Authors: Pan Chin‐Ju , Chou Ta‐Yuan , Lee Chungnan , Huang Chih‐Yu 
Published: February 2006

AbstractSolutions obtained from a wide range of parameters for the optimized design of the antenna are presented. Wide‐bandwidth impedance matching can be achieved using a simply designed indented‐disk monopole antenna for ultra‐wideband (UWB) applications. The design is based on a genetic algorithm (GA)‐based refined method to improve the solution to the UWB antenna design problem. A new optimization process is used to determine a wide range of feasible solutions rather than just the few solutions that can be obtained by trial and error. The wide range of solutions support the manufacturing tolerance effectively. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 693–695, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21445
Stepped impedance hairpin design of a tunable bandpass filter with harmonic suppression
Authors: Chen Yu‐Wei , Ho Min‐Hua 
Published: February 2006

AbstractStepped impedance hairpin resonators (SIHRs) with harmonic suppression and capability of frequency tuning are incorporated into a bandpass filter design. A tapped‐in U‐shaped feed structure is introduced to suppress harmonics and to reduce the passband insertion losses. The passband flexibility is accomplished by using a pair of tuning varactors. A simple method to implant a zero in the frequency response is also studied herein to further deepen the passband skirt. A 176% (4.32 GHz) stopband bandwidth is observed under more than 20‐dB band rejection. A measured minimum insertion loss of 1.19 dB is observed for the circuit with absence of the tuning varactors. Using the varactors, this filter has achieved a 22% frequency tuning range with all the insertion losses less than 5 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 697–701, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21447
Parallel‐coupled bandpass filters with broad rejection band using interdigital fingers and DGS
Authors: Her Man‐Long , Ko Wen , Hsu Ming‐Wei , Wang Yu‐Lin , Hsu Chou‐Jung 
Published: February 2006

AbstractA novel parallel‐coupled bandpass filter (PC‐BPF) with a fundamental frequency of 2.4 GHz is presented in this paper. This proposed filter achieves a broad rejection bandwidth and a sufficient attenuation level by using the distributed interdigital fingers to attenuate the spurious even harmonics of 2f0 and 4f0, and employing a defected ground structure (DGS) resonator to suppress the 3f0 spurious response. The measured results show a satisfactory rejection bandwidth of 8.6 GHz with a rejection level of −30 dB at 2f0. The improved performance will be very attractive for application in many communication systems. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 705–707, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21449
A new contention‐resolution scheme for time‐critical applications in multifiber optical packet‐switched networks
Authors: Li Yi , Xiao Gaoxi , Ghafouri‐Shiraz H. 
Published: February 2006

AbstractIn this paper, we propose a new contention‐resolution scheme for supporting time‐critical applications in multifiber optical packet‐switched networks. The main idea is to utilize redundant idle fibers in optical cables rather than the conventional optical‐fiber delay lines to transfer the contending packets, such that the packets do not need to be buffered on any node. The buffering delay therefore can be eliminated and the quality of the optical signal can be improved as well. The switching‐node architecture is demonstrated and its packet‐loss performance is evaluated. Extensive simulations results show that the new scheme is efficient in resolving packet contentions. It is also shown that better performance is achieved by sparing several fibers in each link solely for the purpose of contention‐resolution rather than simply increasing the number of fibers per link and then averaging data traffic on these fibers. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 717–719, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21453.
Internal UMTS patch antenna for a sliding mobile phone
Authors: Wong Kin‐Lu , Lin Chun‐Yi , Chang Fa‐Shian 
Published: February 2006

AbstractA shorted patch antenna suitable for application in the sliding mobile phone as an internal antenna is presented. The shorted patch antenna is mounted at the bottom end of the lower ground plane of the mobile phone, and can generate a wide operating band for UMTS (1920–2170 MHz) operation in the talk condition (the mobile phone is slid open for use). In addition, when the mobile phone is in the standby condition (not slid open), the antenna can still provide acceptable impedance matching for operating frequencies over the UMTS band. Details of the antenna design are described, and experimental results of a constructed prototype are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 726–729, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21457
A wideband low‐profile microstrip antenna and array
Authors: Mak Ka‐Ming , Wong Hang , Luk Kwai‐Man 
Published: February 2006

AbstractA high‐gain wideband low‐profile microstrip patch antenna array is designed and tested. A method for enhancing the impedance bandwidth through the combination of a driven rectangular patch with parasitic elements is proposed. The array, which has 16 elements in a 4 × 4 arrangement, is pasted on a 2‐mm dielectric substrate. The impedance bandwidth and the gain of the array is 12% (for SWR ≤ 2) centered at 4.5 GHz and 20 dBi, respectively. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 729–730, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21458
Analytical modelling of the current distribution in resistive loaded thin‐wire antennas excited by a transient electric field
Authors: Sagnard F. 
Published: February 2006

AbstractThe analytical modelling of the excitation of a Wu and King loaded dipole by an oblique transient electric‐plane wavefront has been revisited and extended in order to analyze in detail the physical phenomena involved in the time and space domains. The role of several components of the current induced along a dipole as a function of different parameters is discussed. The modelling developed herein allows us to consider a V‐dipole. This study will allow us to consider, in a future work, the case of an assembly of dipoles in the space domain for representing more complex antenna geometries. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 730–736, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21459
A small wideband planar monopole antenna for mobile wireless devices
Authors: Jung Jihak , Yu Yeonsik , Choi Jaehoon 
Published: February 2006

AbstractA small wideband planar monopole antenna for mobile wireless devices is designed and implemented. The proposed antenna satisfies the −10‐dB return‐loss requirement from 1.62 to 10.9 GHz. The antenna can easily cover the DCS1800/1900, IMT‐2000, WiBro, WLAN, DMB, and UWB bands at the same time. The experimental and numerical results of the designed wideband antenna are presented and analyzed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 736–740, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21460
Dual‐frequency design of a shorted triangular patch antenna
Authors: Liou Yen‐Yu , Row Jeen‐Sheen , Chen Tsair‐Rong 
Published: February 2006

AbstractA single‐feed shorted triangular patch antenna that can be operated at two different frequency bands is proposed and studied. The radiation patterns at the two operating frequencies are similar to those of a normal triangular patch antenna operated at its TM11 and TM21 modes, which are a monopolelike conical pattern and a broadside pattern, respectively. In addition, the impedance bandwidth, referring to the 10‐dB return loss, is 18% at the lower operating frequency and 9.4% at the high operating frequency. Details of the antenna designs and the obtained results are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 749–751, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21463
Alternative implementation of combined‐field integral equation using Rao–Wilton–Glisson basis functions for conducting scatterers
Authors: Tan Eng Leong , Ning Jing 
Published: February 2006

AbstractThis paper presents an alternative combined‐field integral equation (CFIE) for conducting scatterers to surmount the nonuniqueness problem around the interior resonance frequencies. The implementation of an alternative CFIE is simplified by transforming the integrals of electric‐field (EFIE) and magnetic‐field (MFIE) integral equations to be of the same type. Through the method of moments (MoM), the commonly used Rao–Wilton–Glisson (RWG) basis and testing functions are exploited in the calculation of the alternative CFIE impedance matrix. The numerical results are illustrated and compared with those of the MFIE. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 753–756, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21465
A novel ultra‐wideband microstrip‐line fed wide‐slot antenna
Authors: Chen D. , Cheng C. H. 
Published: February 2006

AbstractA novel ultra‐wideband wide‐slot antenna fed with a microstrip‐line is presented. The antenna is composed of a circular microstrip patch and a semicircular arc cut on the ground of the microstrip line. The measured results show that the proposed antenna has an impedance bandwidth of more than 150% (|S11| < −10 dB) and stable radiation patterns over its whole frequency band. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 776–777, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21472
Impact of the pump reflector in double‐pass discrete Raman amplifiers
Authors: Md Ali M. I. , Ahmad A. , Zamzuri A. K. , Mohamad R. , Mahdi M. A. 
Published: February 2006

AbstractWe present the experimental investigation of a counter‐pumped double‐pass discrete Raman amplifier with and without a pump reflector. The pump reflector is constructed with high‐reflectivity fiber Bragg grating. Gain improvement is obtained as a result of pump recycling, in comparison to the conventional double‐pass Raman amplifier. Noise‐figure degradation is found for large signals in the proposed Raman amplifier due to the enhanced double‐Rayleigh scattering and bidirectional pumping caused by the pump reflector. The impact of pump‐to‐signal relative intensity noise in the experimental work is minimized by utilizing Fabry–Perot pump lasers. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 777–779, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21473
A rank‐revealing preconditioner for the fast integral‐equation‐based characterization of electromagnetic crystal devices
Authors: Pissoort Davy , Michielssen Eric , Vande Ginste Dries , Olyslager Femke 
Published: February 2006

AbstractA novel rank‐revealing shielded‐block preconditioner that accelerates the iterative integral‐equation‐based analysis of wave propagation in electromagnetic crystal (EC) devices is presented. The proposed shielded‐block preconditioner exploits the bandgap character of the background electromagnetic crystal in order to achieve both rapid convergence of the iterative solver as well as a low matrix‐vector multiplication cost. The versatility and computational efficiency of the shielded‐block preconditioner are demonstrated by its application to the analysis of wave propagation in a defectless electromagnetic crystal along an electromagnetic crystal waveguide and out of an electromagnetic crystal horn antenna array. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 783–789, 2006; Pubished online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21475
Highly efficient LDMOS power amplifier based on class‐E topology
Authors: Lee Jongwoo , Kim Sungwoo , Nam Jungjin , Kim Jangheon , Kim Ildu , Kim Bumman 
Published: February 2006

AbstractThis paper describes a highly efficient class‐E power amplifier. The design has been carried out at 1 GHz using a LDMOS transistor with 10 W of peak envelope power (PEP). Drain efficiency of 76.1%, power‐added efficiency (PAE) of 73.6%, and gain of 14.8 dB are achieved at an output power of 39.1 dBm for a continuous wave (CW) signal. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 783–789, 2006; Pubished online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21476
Optical fibre PPM using a PIN‐FET receiver and central decision detection
Authors: Cryan R. A. , Sibley M. J. N. 
Published: February 2006

AbstractAn analysis is presented, for the first time, for an optical fibre PPM system employing central decision detection. Firstly, an ideal matched filter in conjunction with a noise‐whitening filter is considered and secondly a raised cosine filter to eliminate intersymbol interference is modelled. It is shown that the latter offers superior performance. The results for a 155.52 Mb/s system predict a sensitivity of −57.6 dBm, an improvement of 6 dB over an equivalent PCM system. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 791–794, 2006; Pubished online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21477
Even‐mode multiport network model for slotted dual‐band rectangular microstrip antennas
Authors: Deshmukh Amit A. , Kumar Girish 
Published: February 2006

AbstractAn even‐mode multiport network model (MNM) for rectangular microstrip antenna, which reduces computation time to evaluate the input impedance, is discussed. This concept is used to analyze various dual‐band slotted antennas such as a U‐slot loaded rectangular microstrip antenna, an E‐shaped microstrip antenna, and a rectangular microstrip antenna with a pair of slots. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 798–804, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21479
Novel modeling methodology of LC differential oscillator noise
Authors: Mukherjee Jayanta , Roblin Patrick 
Published: February 2006

AbstractA novel model for analyzing differential LC oscillator noise is presented. The proposed analysis enables us to separately compute the impacts of white and flicker noise on the oscillator phase noise in terms of simple analytical expressions. Further, the analysis also takes into account the contribution of the tail noise of a differential LC oscillator to the total phase noise. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 806–808, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21480
Remarks on “PAE improvement and compensation of small‐signal gain drift due to temperature on power amplifiers through active biasing”
Authors: Bera S. C. 
Published: February 2006

AbstractIn the paper of German Torregrosa‐Penalva et al. 1, a confusing result has been presented. The paper demonstrates the compensation of the small‐signal gain drift with change of temperature and improvement of the FET amplifier's PAE using active biasing, which contradicts the previous published work and our experimental results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 827–828, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21487
Solid‐state NMR studies of the molecular structure of Taxol
Authors: Ho Yu , Tzou Der‐Lii M. , Chu Feng‐I 
Published: February 2006

AbstractSolid‐state 13C{1H} cross‐polarization/magic angle spinning spectroscopy (CP/MAS) has been utilized to extract the molecular structure information of Taxol, which is an anti‐tumor therapeutic medicine extracted from the yew bark. The 13C signals have chemical shift values quite consistent with those measured in solution phase, and the overall chemical shift range is over 200 ppm. Notably, most of the 13C resonances of the taxane ring have two clearly resolved spectral components except the resonance peaks of C‐15, C‐16 and C‐17, which are located at the central part of the taxane ring. On the basis of our NMR data, we propose that these doublets originate from two slightly different molecular conformations of the taxane ring and still the central part of the ring remains structurally similar. Furthermore, it is demonstrated that the 13C chemical shift difference deduced from the doublet splittings can serve as a direct measure of the structural difference between the two conformations, which could possibly correlate with the anti‐tumor activity of Taxol. Copyright © 2006 John Wiley & Sons, Ltd.
Expression and downregulation of WNT signaling pathway genes in rhesus monkey oocytes and embryos
Authors: Zheng Ping , Vassena Rita , Latham Keith 
Published: March 2006

AbstractMammalian WNT genes encode secreted glycoproteins that are conserved homologues of the Drosophila Wingless gene, which plays a crucial role in Drosophila development. Recently, WNT pathway signaling has been implicated in ovarian development, oogenesis, and early development. We sought to evaluate whether these genes may contribute to the formation of healthy human oocytes or embryos, and whether the expression of these genes could provide informative markers of human oocyte and embryo quality. To do this, we employed the primate embryo gene expression resource (PREGER; www.preger.org) to examine expression of mRNAs encoding 38 components of the WNT signaling pathway in rhesus monkey oocytes and embryos as a nonhuman primate model. We observed considerable conservation between rhesus monkey and mouse of expression of WNT, FZD, and effector gene mRNAs, and a generalized downregulation of genes encoding key components of the WNT signaling pathway during preimplantation development. Our results support a role for WNT signaling during oocyte growth or maturation, but not during preimplantation development. Additionally, we observed differences between in vitro cultured and in vivo developing blastocysts, indicating possible effects of culture on WNT signaling during the peri‐implantation period. Mol. Reprod. Dev. © 2006 Wiley‐Liss, Inc.
Prediction of specific absorption rate in mother and fetus associated with MRI examinations during pregnancy
Authors: Hand J.W. , Li Y. , Thomas E.L. , Rutherford M.A. , Hajnal J.V. 
Published: February 2006

AbstractThere is uncertainty regarding the risk posed by magnetic resonance imaging (MRI) examinations to pregnant patients. The most frequently used methods, such as single‐shot fast spin echo (ssFSE), often require operation at the specific absorption rate (SAR) limits imposed by safety guidelines. With the introduction of higher‐field systems, such limits will be even more significant for fetal imaging. An electromagnetic solver based on the time domain finite integration technique (FIT) was used to predict SAR in an anatomically realistic model of a pregnant patient (28 weeks' gestation) associated with the radiofrequency (RF) fields from birdcage body coils typical of 1.5 T and 3 T MRI systems (i.e., operating at approximately 64 and 127 MHz, respectively). The results suggest that 1) the highest local SAR is in the mother, with the fetus being exposed to a peak of approximately 40–60% of that value at 64 MHz, increasing to approximately 50–70% at 127 MHz; 2) compliance with U.S. Food and Drug Administration (FDA) and International Commission on Non‐Ionizing Radiation Protection (ICNIRP) guidelines requires control of SAR values averaged over 1 g or 10 g of tissue, respectively; and 3) compliance with Medical Device Agency (MDA) guidelines requires control of the maximum SAR10g within the fetus. Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.
Feasibility of the single‐bolus strategy for measuring the partition coefficient of Gd‐DTPA in patients with myocardial infarction: Independence of image delay time and maturity of scar
Authors: Thornhill Rebecca E. , Prato Frank S. , Wisenberg Gerald , White James A. , Nowell Judith , Sauer Anya 
Published: February 2006

AbstractThe partition coefficient of Gd‐DTPA (λ) is elevated in infarcted relative to normal myocardium. Although MRI following an infusion of Gd‐DTPA allows for the quantification of λ, infarct imaging is more routinely performed using a bolus. In this study we sought to determine how image delay time and time postinfarction influence the estimation of λ by the bolus strategy. Both infusion and bolus imaging were performed twice in the same group of patients (N = 9): once at 3–4 weeks and again 6 months after reperfusion therapy for myocardial infarction (MI). Bolus estimates of λ were compared with those calculated after 60 min infusion, and comparisons were repeated at 6 months. The λ of infarcted myocardium was significantly greater than that of normal tissue, irrespective of either the technique used or the time postinfarction (P < 0.0001, for each). The concordance (Rc) between bolus and infusion estimates of λ was >0.83 for all image delays >4 min postinjection, and Rc at 2 min (0.78 ± 0.04) was significantly less than Rc determined for longer image delay times (P = 0.009). Rc did not change with time postinfarction (P = 0.604). Thus, the bolus strategy can be used to provide estimates of λ that are stable from 1–6 months postinfarction and independent of image delay time. Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.