bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the Laplacian vector fields theory in domains with rectifiable boundary
Authors: Abreu‐Blaya R. , Bory‐Reyes J. , Shapiro M. 
Published: June 2006

AbstractGiven a domain Ω in ℝ3 with rectifiable boundary, we consider main integral, and some other, theorems for the theory of Laplacian (sometimes called solenoidal and irrotational, or harmonic) vector fields paying a special attention to the problem of decomposing a continuous vector field, with an additional condition, u on the boundary Γof Ω ⊂ ℝ3 into a sum u = u++u− were u± are boundary values of vector fields which are Laplacian in Ω and its complement respectively. Our proofs are based on the intimate relations between Laplacian vector fields theory and quaternionic analysis for the Moisil–Theodorescu operator. Copyright © 2006 John Wiley & Sons, Ltd.
Time and wavelength domain contention resolution in an optical packet routing node
Authors: Olmos J. J. Vegas , Chi N. , Monroy I. Tafur , Koonen A. M. J. , Yu S. 
Published: June 2006

AbstractWe experimentally demonstrate an optical packet routing node with contention resolution in the time and wavelength contention domain. The node comprises an optical buffer and a wavelength converter. Although the experimental results are shown at 10 Gb/s, the bitrate can be increased substantially. Bit‐error rate measurements are shown, sustaining only 3.5 dB power penalty after 10 μs of optical buffering and wavelength conversion over 5 nm wavelength span. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1728–1729, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21745
On the circularly polarized hemi‐ellipsoidal dielectric resonator antenna
Authors: Li Bin , Leung Kwok Wa 
Published: June 2006

AbstractThe circularly polarized cross‐slot‐coupled hemi‐ellipsoidal dielectric resonator antenna (HEDRA) is studied in this letter. Reasonable agreement between simulation and measurement is obtained. A HEDRA is demonstrated, which has a 10‐dB impedance bandwidth (S11 < −10 dB) of 15.4% and a 3‐dB axial ratio bandwidth of 3.9%. The characteristics of the HEDRA are found. In addition, a comparison between the straight‐ and cross‐slot feeds is made in this letter. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1763–1766, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21749
A novel defected ground structure and its application to a lowpass filter
Authors: Li Guo‐Hui , Jiang Xin‐Hua , Zhong Xiao‐Ming 
Published: June 2006

AbstractA novel defected ground structure (DGS) with two semicircular defected areas is investigated for low pass filter (LPF) applications. An equivalent lumped L‐C circuit model is presented and its corresponding L‐C parameters are also extracted by using parametric relationships. With this structure, the effect of the defected parameters on performance is detailed. Based on the equivalent circuit model, a 3‐pole LPF, using 2 DGS units, is optimally designed and implemented. The results from experiments confirm that the designed LPF can provide a very wide stop band, which is approximately 3.7 times of the cutoff frequency. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1760–1763, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21750
Semi‐analytical computation and 3D modeling of the microwave photo‐induced load in CPW technology
Authors: Gary René , Arnould Jean‐Daniel , Vilcot Anne 
Published: June 2006

AbstractTo be faster and more precise than the numerical technique for the computation of the photo‐induced plasma in semiconductor, an analytical solution has to be developed. In this article, the Hankel transform is used to simplify the solution of the differential equation of second order with nonsconstant coefficient, known as the diffusion equations. The resulting expression of the 3D carrier density includes all the physical parameters of the substrate and the laser beam as well. A parametric study was also feasible using the developed expressions. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1718–1721, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21754
The SSOR‐preconditioned inner outer flexible GMRES method for the FEM analysis of EM problems
Authors: Ping X. W. , Chen R. S. , Tsang K. F. , Yung Edward K.N. 
Published: June 2006

AbstractWhen solving electromagnetic problems by finite element method, the resulting linear systems are ill‐conditioned when the PML absorbing layers are adopted. Traditional Krylov iterative algorithms usually converge slowly or may even stagnate. In this paper, the combination of the inner–outer Flexible Generalized Minimum Residual Method (GMRES) and the symmetric successive overrelaxation (SSOR) preconditioning scheme is used to accelerate the iteration for solving a large sparse system of linear equations resulting from the analysis of EM problems by use of edge‐based finite element method (FEM). The numerical results show that tens of times convergence improvement can be achieved compared with the conventional GMRES solver. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1708–1712, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21758
Study of an L‐shaped EMC chip antenna for UMTS operation in a PDA phone with the user's hand
Authors: Lin Chun‐I , Wong Kin‐Lu , Yeh Shih‐Huang , Tang Chia‐Lun 
Published: June 2006

AbstractA new L‐shaped foam‐base chip antenna having an electromagnetic compatibility property for UMTS operation is presented. With the L‐shaped structure, the proposed chip antenna is very suitable to be placed at the corner of the system ground plane of a mobile phone or PDA phone. With the electromagnetic compatibility property, the antenna can be placed close to or in direct contact with the possible nearby conducting elements, with negligible effects on the antenna performances. The proposed L‐shaped chip antenna can be with various aspect ratios and provide a wide operating bandwidth for UMTS (1920 ∼ 2170 MHz) operation. Further, in this study, the user's hand effects on the performances of the proposed antenna are also analyzed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1746–1749, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21759
Experimental investigation on chemical sensor based on a multimode fiber Bragg grating
Authors: Sang Xinzhu , Yu Chongxiu , Yan Binbin , Mayteevarunyoo T. , Wang Kuiru , Lu Naiguang 
Published: June 2006

AbstractA chemical sensor based on a Bragg grating in the multimode fiber has been demonstrated experimentally. Experimental results indicate that the reflection peak of high‐order mode P2 exhibits a much higher concentration sensitivity of the chemical solution than the reflection peak P1 of the high‐order mode. The sensor has been used to measure the concentrations of propylene glycol solutions and sugar solutions, which could detect 0.05% and 0.04% concentration change for them with the wavelength interrogation module of 1‐pm resolution. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1739–1741, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21761
High‐power narrow line width tunable cladding pumped Er:Yb co‐doped fiber laser
Authors: Zhang Shu‐min , Lu Fu‐yun , Wang Jian 
Published: June 2006

AbstractA narrow line width, tunable, and highly efficient fiber laser based on Er3+/Yb3+ co‐doped double‐clad fiber with the maximum output power of 438 mW and a slope efficiency of ∼16% has been demonstrated. By using a fiber Bragg grating (FBG) as a narrow band reflector, 3‐dB line width of the output laser could be as narrow as 0.04 nm over the whole tuning range, and by compressing or stretching the FBG, wavelength tunable range of 4.0 nm was realized. In the experiment, we also found that there existed an optimum splitting ratio of the output coupler, at which the maximum output power could reach ∼647 mW. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1736–1739, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21762
Design of metamaterial superstrates and substrates for directivity and port isolation enhancement of a dual‐frequency dual‐polarization microstrip antenna
Authors: Lee Dong H. , Lee Young J. , Yeo Junho , Mittra Raj , Park Wee S. 
Published: June 2006

AbstractIn this paper, we propose a novel design for enhancing the directivity and port isolation of a dual‐frequency dual‐polarization (DFDP) microstrip antenna by using metamaterial superstrates and substrates. To enhance the directivity of this without a complex feed network, we first design a strip‐mesh type of Frequency Selective Surface (FSS) type superstrate as a cover for a DFDP antenna, which supports two orthogonal polarizations at two different resonant frequencies. Next, a 2D anisotropic uniplanar compact bandgap type ground plane is introduced to enhance the isolation between the two ports of the DFDP antenna. It is demonstrated that the directivity at two frequency bands is enhanced by about 13 dB in the first band and by ∼12 dB at the second one, when compared with the patch antenna alone. Also, the isolation between the two ports is shown to be −35 dB, which is −15 dB lower than that of a conventional patch antenna. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1873–1876, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21764
Substructuring approach to optimization of matching for photonic crystal waveguides
Authors: Steinberg Ben Z. , Boag Amir , Hershkoviz Orli 
Published: June 2006

AbstractA substructuring approach for numerical optimization of photonic crystal devices is proposed and demonstrated. Specifically, we consider the matching of coupled cavity waveguides (CCW's)—known also as coupled resonators optical waveguides (CROWs)—to free space. In this approach, one separates a priori between the invariant main structure that consists most of the PhC and the CCW, and the substructure that consists of a small portion of the CCW and evolves along the optimization course. Specific examples of matching configurations with insertion loss as low as few percent are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1866–1871, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21766
On the performance of dichroic mirrors with hexagonal holes
Authors: Besso Piermario , Bozzi Maurizio , Formaggi Marco , Germani Simone , Perregrini Luca 
Published: June 2006

AbstractThis article presents an innovative design of a 45°‐incidence S/X/Ka‐band inductive dichroic mirror, intended for the upgrade of a ground station antenna of the European Space Agency supporting deep‐space missions. The dichroic mirror consists of a thick metal plate perforated periodically with hexagonal holes. The use of hexagonal shapes allows for tightly packing the holes and provides a large number of degrees of freedom. This permits to improve the electrical performance of the dichroic mirror and to increase its mechanical stiffness. To highlight the advantages of this shape, first we report the simulated and measured performance of a dichroic mirror with rectangular holes, with the aim of validating the analysis tool and of providing a comparison for the new design. Afterward, we discuss the design of the new dichroic mirror based on hexagonal holes, and systematically compare the performance obtained in the two cases, namely with rectangular and hexagonal holes. It is shown that the use of the new dichroic mirror with hexagonal holes permits to preserve the radiation pattern of the feed horn and does not significantly increase the cross‐polar level. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1858–1862, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21767
Design of microstrip filter and diplexer with a multiple harmonics suppression for mobile communication
Authors: Chen Yu‐Wei , Ho Min‐Hua 
Published: June 2006

AbstractA folded hybrid coupled‐line microstrip bandpass filter with multiple harmonics suppression and wide stopband bandwidth is proposed in this research. A simple design rule together with the usage of an over‐ and an under‐coupled structure is adopted in this filter to eliminate the first two spurious responses from using circuit's zeros. Then, the coupled straight lines are transformed to a folded‐line layout to save the circuit space and to tune the third transmission zero for the removal of an extra spurious response. An experiment is conducted for validation and good agreement between simulation and measurement is observed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1812–1816, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21769
Design of UWB lowpass filter using a novel defected ground structure
Authors: Zhang Fei , Gu Jiangzhong , Shi Lina , Li Chengfang , Sun Xiaowei 
Published: June 2006

AbstractIn this study, firstly, a novel U‐shaped defected ground structure(UDGS) cell is proposed to hold both wide band gap and excellent slow‐wave characteristic. The design, simulation, and fabrication of compact ultra wideband(UWB) low pass filters (LPFs) using two UDGSs and a compensated microstrip line are reported. No open stubs, high impedance lines, and tee‐/cross‐junction are required, which makes the proposed LPFs smaller in size and suitable for high power application. Investigations on the slow‐wave effects and scattering/radiation levels for a microstrip with the UDGS are also included. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1805–1807, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21772
Electromagnetic field sensor using Mach‐Zehnder waveguide modulator
Authors: Lee Tsung‐Hsin , Hwang Fu‐Tsai , Shay Wen‐Tron , Lee Ching‐Ting 
Published: June 2006

AbstractAn electromagnetic field sensor linking a LiNbO3electrooptical modulator with a circular antenna was studied. In this sensor, a Mach‐Zehnder electrooptical modulator was used as one of the fundamental building blocks. The frequency response was flat from 50 MHz to 3 GHz. The minimum detectable electromagnetic field intensity is 0.7 mV/m at 50 MHz and 1.2 mV/m at 3 GHz, respectively. © 2006 Wiley Periodicals,Inc.Microwave Opt Technol Lett 48:1897–1899, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21776
A domain decomposition scheme based on equivalence theorem
Authors: Li Mao‐Kun , Chew Weng C. , Jiang Li J. 
Published: June 2006

AbstractA domain decomposition scheme based on the equivalence theorem and the method of moments is introduced. The unknowns on every subscatterer are transferred to the unknowns on its surrounding equivalent surface. With this scheme, both the number of unknowns and the memory usage are reduced. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1853–1857, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21777
Reduced‐size reconfigurable tri‐band printed antenna with CPW tapered‐feed and shorting post
Authors: Evans J. A. , Ammann M. J. 
Published: June 2006

AbstractA multiband printed monopole antenna is presented, operating primarily in the 900 MHz, 2.4 GHz bands, and 5 GHz bands. A coplanar waveguide feed arrangement is deployed, simplifying the antenna structure to a single side of a printed substrate material. Despite the small size of the antenna, a lower‐edge frequency of 650 MHz is achieved. An impedance bandwidth of 63% is achieved in the 2.4‐GHz band. The low profile antenna presented is potentially suitable for applications in modern mobile and portable radio systems that require operation over widely separated bands, combining multi‐band operation with small size and low profile. With the application of a shorting post, the antenna has the potential for reconfigurable applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1850–1853, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21778
Arrayed‐waveguide‐grating‐based correlator for optical header recognition
Authors: Aljada Muhsen , Alameh Kamal E. , Al‐Begain Khalid 
Published: June 2006

AbstractWe propose an incoherent optical correlator for header recognition in optical packet‐switched networks, employing two arrayed waveguide grating and waveguide delay lines. The operation is demonstrated experimentally for 4‐bit patterns at 2.5 Gb/s. Results show that the proposed optical correlator generates autocorrelation and cross‐correlation signals that can easily be recognized using a simple threshold detector. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1839–1843, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21782
Loss characteristics of silicon substrate with different resistivities
Authors: Yang Ru‐Yuan , Hung Cheng‐Yuan , Su Yan‐Kuin , Weng Min‐Hang , Wu Hung‐Wei 
Published: June 2006

AbstractIn the design of high‐speed and high frequency IC's, the influence of the substrate on the circuit performance must be considered carefully. This work investigates the loss characteristic of silicon substrate with different resistivities and distinguishes theoretically and experimentally the dielectric losses into the intrinsic loss of silicon (tan δD) and the extrinsic substrate leakage loss (tan δL) caused by the finite conductivity of the substrate. The dielectric relaxation (cut off) frequency as a function of silicon substrate resistivity are calculated as considering the conditions of substrate noise isolation and RF passive device design. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1773–1776, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21786
Design of a frequency tripler using a novel bandpass filter for Ku‐band application
Authors: Min Jun‐Ki , Kim Hyun‐Jin , Kim Yong‐Hwan , Yu Hyung‐Soo , Lee Jong‐Chul , Hong Ui‐Seok 
Published: June 2006

AbstractThis study presents a frequency tripler using APDP (anti‐parallel diode pair) in which a new structure of bandpass filter (BPF) with low insertion loss and small size is adopted instead of a conventional coupled line BPF. The tripler using the proposed filter is measured and compared with the one using a conventional coupled line BPF. This BPF shows the insertion loss of less than 0.7 dB within the bandwidth of 16.41–19.23 GHz. The conversion loss of the tripler is about 16.6–18.5 dB with flatness of less than ±1 dB at the fundamental frequency of 5.72–6.28 GHz. The suppression characteristics for the first and fifth harmonic signals at 6.1 GHz are −32.16 and −44.6 dBc, respectively, and its phase noise attenuation is about 9.5 dB at 100 kHz offset. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1770–1773, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21787
Locally‐conformal perfectly matched layer implementation for finite element mesh truncation
Authors: Ozgun Ozlem , Kuzuoglu Mustafa 
Published: June 2006

AbstractIn this article, we introduce the locally conformal perfectly matched layer (PML) technique, which is an easily implementable conformal PML implementation, obtained via complex coordinate transformation, for the purpose of mesh truncation in the finite element method. After deriving the governing equations, we test this technique using electromagnetic scattering problems. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1836–1839, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21788
DC or pulse I(V) measurements to simulate transmission line class E power amplifiers
Authors: Loo‐Yau J. R. , Ascencio‐Ramírez Hugo , Reynoso‐Hernández J. A. 
Published: June 2006

AbstractIn FET I(V) nonlinear modeling, the I(V) experimental data are important because they allow one to determine the initial values of the empirical nonlinear model. Pulsed I(V) are preferred over DC measurements because of dispersion phenomena. However, the simulation of a class E PA using I(V) empirical nonlinear model constructed from DC or pulsed measurements to predicts values of PAE, gain, and efficiency are similar. Although this fact can be predictable or evident, because the transistor works in the region where heating and dispersion effects are small, this has not been experimentally demonstrated yet. Therefore the main purpose of this work is to determine whether pulse or DC I(V) measurements are suitable to develop the nonlinear model in order to predict the main features of a transmission line class E PA as Pout, drain efficiency, and PAE. The simulations using both types of data were compared with two experimental transmission line class E PA, designed at 0.8 and 1.9 GHz. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:1886–1890, 2006; Published online in Wiley InterScience (www.interscience.wiley.com(. DOI 10.1002/mop.21794
Moment method analysis of rectangular waveguide as near‐field measuring probe
Authors: Paramesha Sri , Chakrabarty Ajay 
Published: June 2006

AbstractThe aperture in an infinite ground plane backed by a rectangular waveguide is used as near‐field probe. The reflection coefficient of the radiator, which is also an open‐end of a rectangular waveguide, is computed and compared with the reflection coefficients, when the probe is at different positions in the near‐field. Computations have also been carried out to find the induced probe voltage, when the probe scanning in transverse plane (planar scanning) is at a distance z1 from the radiator. Good agreement is obtained between measured and MOM results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1802–1805, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21798
Beam‐squint minimization in series‐slotted waveguide array antennas using double negative materials
Authors: Oh Soon‐Soo , Shafai Lotfollah 
Published: June 2006

AbstractA 5 × 1 series‐slotted waveguide array antenna partly filled with double positive (DPS) and double negative (DNG) materials is investigated. The DNG material has a negative wave vector and its guided‐wavelength equals that of the DPS material. Two simple straight slotted waveguides, one filled only with the DPS material and the other with both DPS and DNG materials, are designed and studied. It is found that the latter waveguide has repeated voltage standing wave shapes. This unique characteristic is utilized to minimize the beam squinting effect in the series‐fed array antennas. It is shown that in a 5 × 1 array using both DPS and DNG materials, the variation in the direction of its beam and boresight gain are limited to 0.5 ° and 0.8 dB, respectively, within a 10% frequency band. In the corresponding conventional array these parameters were 5 ° beam tilt and 3.3 dB boresight gain loss. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1789–1792, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21800
A dual‐band antenna with coplanar ring and patch
Authors: Chang The Nan , Sun Hsu Hsien 
Published: June 2006

AbstractIn this paper, a coplanar ring and patch antenna for dual‐band operation is presented. The patch is placed inside a rectangular ring. A coupling strip located in between the rectangular ring and the patch is used to excite them through a 50‐Ω coaxial cable. The proposed antenna was built on a two‐layer (FR4 and air) substrate with an area of 28 mm by 28 mm designed for WLAN in 2.4‐ and 5.2‐GHz bands. The size of the conducting ground plane is 65 mm by 65 mm. It has a gain of about 5 dBi for both frequencies. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1785–1789, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21801