bluuebunny/crossref_metadata_2025_split huggingface dataset:
A modification to a simple field model of the TE01δ mode of the parallel‐plate open dielectric resonator
Authors: Sheen Jyh , Bhalla A. S. , Cross L. E. 
Published: July 2007

AbstractA modification to the field expressions on the simple Itoh and Rudokas model for the TE01δ mode of the parallel‐plate open dielectric resonator is given. This modification is justified by the dramatic improvement in the accuracy of resonant frequency prediction. © 1994 John Wiley & Sons, Inc.
Input impedance of a probe‐fed superstrate‐loaded cylindrical‐rectangular microstrip antenna
Authors: Ke Shyh‐Yeong , Wong Kin‐Lu 
Published: July 2007

AbstractA probe‐fed superstrate‐loaded rectangular microstrip antenna mounted on a cylindrical body is investigated by using a full‐wave analysis and a moment‐method calculation. Numerical results for the input impedance are calculated and the numerical convergence of the moment‐method calculation is also shown. Variations of the input impedance with the superstrate thickness and curvature radius are presented and discussed. Both the HE01 and HE10 modes are studied. © 1994 John Wiley & Sons, Inc.
Structural impact on the below‐threshold spectral behavior of three‐phase‐shift (3PS) distributed feedback (DFB) lasers
Authors: Ghafouri‐Shiraz H. , Lo B. S. K. 
Published: July 2007

AbstractThe impacts of the values of phase shifts and the corresponding phase‐shift positions (PSP) on the spontaneous emission spectra of a three‐phase‐shift (3PS) distributed feedback (DFB) laser have been analyzed at below threshold. Side‐mode suppression of more than 25 dB is achieved with a proper selection of phase shifts and their positions. The use of the transfer matrix method (TMM) in the analysis reveals promising potential for improving and optimizing the structural design of the 3PS DFB lasers in both the below and lasing threshold applications. © 1994 John Wiley & Sons, Inc.
Ellipsoidal and hyperboloidal lens aperture functions for computation of fraunhofer diffraction patterns
Authors: Lazarus M. J. 
Published: July 2007

AbstractThe illumination profile functions of ellipsoidal and hyperboloidal dome refracting lenses are obtained in forms suitable for direct computation of diffraction patterns. The effects of anisotropic radiation from the primary source and intensity distortion on refraction are treated. The resultant Fraunhofer diffraction lobe structures are compared. © 1994 John Wiley & Sons, Inc.
Analysis and design of the class E amplifier with nonzero on resistance
Authors: Li Chi‐Hung , Yam Yu‐On 
Published: July 2007

AbstractA modified method is derived to analyze the optimum performance of the Class E amplifier with nonzero ON resistance. The required circuit component values can be calculated directly by this method. No direct‐search optimization of the component value is required, so computation time is saved. In addition, nonzero ON resistance of the transistor can be used to estimate the power loss in the transistor, and thus the collector efficiency of the amplifier can be calculated more accurately. © 1994 John Wiley & Sons, Inc.
Characterization of crossing strips laid on a semiconducting substrate using the transverse resonance method
Authors: Saidi K. , Seguinot C. , Pribetich P. , Kennis P. 
Published: July 2007

AbstractIn this contribution we propose an original extension of the wellknown transverse resonance method to the analysis of crossing strips laid on semiconducting substrates. Our first results involve the resonance of one isolated strip on a homogeneous or multilayered semiconducting substrate. They demonstrate that low‐loss MMIC structures can be analyzed with the transverse resonance method. Further investigation is necessary in order to determine the validity of this method when determining the equivalent circuit of crossing strips laid on semiconductors. © 1994 John Wiley & Sons, Inc.
A numerical absorbing boundary condition for finite‐difference and finite‐element analysis of open structures
Authors: Boag Amir , Boag Alona , Mittra Raj , Leviatan Yehuda 
Published: July 2007

AbstractIn this article we present a novel approach to deriving local boundary conditions that can be employed in conjunction with the finite‐difference and finite‐element methods (FD/FEM) to solve electromagnetic scattering and radiation problems. The key step in this approach is to derive linear relationships that link the values of the field at the boundary grid points to those at the neighboring points. These linear relationships are satisfied, to within a certain tolerance, by all of the outgoing wave components. They can thus be used in lieu of the FD/FEM equations employing the usual absorbing boundary conditions for the boundary points. The present approach not only provides a simple way to derive an accurate boundary condition for mesh truncation, but also preserves the banded structure of the FD/FEM matrices. © 1994 John Wiley & Sons, Inc.
Comparison of insertion losses of s‐shaped optical waveguide bends
Authors: Yamauchi Junji , Saito Osamu , Ikegaya Morihiko , Sawamoto Takehito , Nakano Hisamatsu 
Published: July 2007

AbstractThe beam‐propagation method is used to analyze the insertion losses of S‐shaped dielectric slab bends. Two circular arcs, sine‐generated, and cosine‐generated curves are compared and discussed. Calculation shows that the S‐shaped bend composed of two circular arcs with constant curvature gives excellent performance, provided the core is properly offset. © 1994 John Wiley & Sons, Inc.
Full‐wave analysis of mutual coupling between cylindrical‐rectangular microstrip antennas
Authors: Ke Shyh‐Yeong , Wong Kin‐Lu 
Published: July 2007

AbstractThe mutual coupling between two probe‐fed cylindrical‐rectangular microstrip antennas is studied by using a full‐wave analysis and a moment‐method calculation. Numerical results of the E‐plane and H‐plane mutual coupling coefficients for the cylindrical microstrip antennas with different curvature radii are presented, and the curvature effect on the mutual coupling is studied. © 1994 John Wiley & Sons, Inc.
Transverse electric modes in shielded strip line
Authors: Tsitsos S. , Gibson A. A. P. 
Published: July 2007

AbstractTriplate shielded strip line is an important low‐loss, high‐power transmission line geometry widely used in beam‐former arrays. Accurate design information on higher‐order mode onset frequencies is presented here using finite‐element techniques and an experimental cavity method. Field plots and some design recommendations are included for completeness. © 1994 John Wiley & Sons, Inc.
Low‐cost antennas for direct broadcast satellite radio
Authors: Wu T. K. , Huang J. 
Published: July 2007

AbstractTwo omnidirectional and circularly polarized low‐gain antennas (the crossed drooping dipole and the TM21‐mode circular patch antenna) are developed for direct broadcast satellite radio (DBSR) outdoor mobile terminal applications. Two medium‐gain circularly polarized microstrip patch arrays [one uses the conventional circular polarization (CP) feed and the other uses the sequentially arranged CP feed techniques] are also developed to provide at least 12–dBic peak gain for DBSR indoor fixed terminal applications. The sequentially arranged CP fed array has a better CP performance over a broader bandwidth than the conventionally fed array. All the antennas are small in size/mass and inexpensive in fabrication cost. The patch antennas also have a low profile. © 1994 John Wiley & Sons, Inc.
A finite‐element analysis of bending dielectric waveguides with reflection walls
Authors: Chung Shyh‐Jong 
Published: July 2007

AbstractThe finite‐element method together with the Green's‐function technique is employed to tackle the scattering problems of bending dielectric waveguides with reflection walls. The influences of the frequency, the ratio of waveguide widths, and the length of the reflection wall on the scattering characteristics of 90° and 120° bends are presented. © 1994 John Wiley & Sons, Inc.
Computation of the equivalent inductive circuit for an arbitrary number of e‐plane metal inserts in rectangular waveguides
Authors: Liu Ce 
Published: July 2007

AbstractAn explicit formula for computing the equivalent inductive circuit parameters of E‐plane metal inserts is derived. The number of inserts is arbitrary. The thickness of each insert is taken into account. An equivalent T network is used to model the E‐plane discontinuity. The dielectric constant between the metal inserts can be different. A mode‐matching method is used in the formulation. © 1994 John Wiley & Sons, Inc.
Reflection and transmission for planar structures of uniaxial chiro‐omega media
Authors: Wenyan Yin , Wengbing Wang 
Published: July 2007

AbstractThe generalized spectral‐domain‐exponential matrix technique is used for analyzing the reflection and transmission characteristics of a grounded and ungrounded uniaxial chiro‐omega slab, respectively. Parameter studies are performed to investigate the effects of changing the orientations of ω elements on the reflection and transmission coefficients. The potential applications of uniaxial chiro‐omega media for microwave and millimeter wave regimes are pointed out. © 1994 John Wiley & Sons, Inc.
Rapid approximation of conducting problems using a dual image approach
Authors: Kastner Raphael 
Published: July 2007

AbstractEquivalent surface electric and magnetic sources can generate an approximate far field scattered off a conductor. These are exact (electric) and approximate (magnetic) images of the exciting equivalent sources. A physical‐optics‐type computation with improved accuracy, which also accommodates concave surfaces, is achieved. © 1994 John Wiley & Sons, Inc.
Microwave characterization of slot line and coplanar strip line on high‐resistivity silicon for a slot antenna feed network
Authors: Simons Rainee N. , Taub Susan R. , Lee Richard Q. , Young Paul G. 
Published: July 2007

AbstractThis article presents the effective dielectric constant (ϵeff) and attenuation constant (α) of an unshielded slot line and a coplanar strip line on a high‐resistivity (5000–10,000 ω‐cm) silicon wafer. The ϵeff(dc to 40 GHz) and α (dc to 26.5 GHz) in each case are determined from the measured resonant frequencies and insertion loss of a ring resonator. The measurements are carried out at room temperature. No dc bias is applied to the transmission lines. The attenuation for slot line and coplanar stripline on silicon are compared with microstrip line and coplanar waveguide on other semiconductor substrate materials. Lastly, a microstrip‐to‐slot‐line transition and its use in a feed network for linearly tapered slot antennas is demonstrated. © 1994 John Wiley & Sons, Inc.
Bandwidth of a resonant rectangular microstrip antenna
Authors: Güney K. 
Published: July 2007

AbstractA new very simple curve‐fitting expression is presented for the bandwidth of resonant rectangular microstrip antennas. It is derived from numerical results available in the literature, and is useful for many engineering purposes. The results obtained by using this expression are in conformity with those reported elsewhere. © 1994 John Wiley & Sons, Inc.
Determination of the open‐end discontinuity and resonance frequency of a suspended microstrip using the slr technique
Authors: Verma A. K. , Hassani Sadr G. 
Published: July 2007

AbstractThis article presents a model, called the EKJK model, to determine the open‐end discontinuity of a suspended microstrip line. The accuracy of the model is confirmed within 2% compared to the computed resonance frequency by this model and by the SDA. The effects of the width of the line and top shield on the resonance frequency of the suspended line resonator are also reported. © 1994 John Wiley & Sons, Inc.
Resonant frequency of a tunable rectangular microstrip patch antenna
Authors: Güney K. 
Published: July 2007

AbstractThe resonant frequency of a coaxial‐probe‐fed rectangular microstrip antenna tuned by a number of passive metallic posts suitably placed within the antenna's boundary is obtained by using the resonant frequency expression in the absence of the post. The resonant frequency in the absence of the post is calculated from the fringing field extension and effective relative permittivity expressions. The theoretical resonant frequency results of tunable rectangular patch antenna obtained by using this method are in good agreement with experimental results available in the literature. © 1994 John Wiley & Sons, Inc.
Frequency selective surface design for submillimetric demultiplexing
Authors: Cahill R. , Parker E. A. 
Published: July 2007

AbstractEfficient diplexing of bands centered at 200 and 600 GHz has been achieved using two types of frequency selective surfaces. Computer and measured results are used to assess their suitability as beam splitters in a submillimeter‐wave quasioptical radiometer. © 1994 John Wiley & Sons, Inc.
Numerical analysis of an asymmetric nonlinear directional coupler
Authors: Yasumoto Kiyotoshi , Maeda Hiroshi 
Published: July 2007

AbstractThe power transfer characteristics of an asymmetric nonlinear directional coupler (NLDC), which consists of a nonlinear waveguide with a core of Ken‐like medium and a linear waveguide, are analyzed using the beam propagation method. The numerical results demonstrate that the asymmetric NLDC is useful for constructing an optical power filler. © 1994 John Wiley & Sons, Inc.
The limitation of the parameters of a one‐bit phase shifter based on s‐n transition in HIGH‐Tc superconductors
Authors: Vendik I. B. 
Published: July 2007

AbstractEvaluation of the limiting characteristics of one‐bit reflection‐type phase shifters based on the S‐N transition in high‐Tc superconducting (HTSC) films is done, taking into account real parameters of the HTSC films. The results can be used for the design and optimization of digital phase shifters. © 1994 John Wiley & Sons, Inc.
A quasistatic method for the characterization of stratified dielectric materials using an open‐ended coaxial probe
Authors: Misra Devendra K. , McKelvey Jeffrey A. 
Published: July 2007

AbstractAn open‐ended coaxial probe method has been investigated for the characterization of a stratified dielectric medium. A static formulation for its aperture capacitance is employed for this purpose. This approach is found to be fairly accurate in the frequency range of 500 MHz‐2 GHz. It can be applied for monitoring the delamination or other defects in sheet materials by measuring the permittivity profile of the dielectric samples. © 1994 John Wiley & Sons, Inc.
On polarizability properties of bianisotropic spheres with noncomplete magnetoelectric dyadics
Authors: Sihvola Ari H. 
Published: July 2007

AbstractThe polarizability expressions for bianisotropic scatterers are often complicated expressions of the material parameters. This communication treats the question of how the dyadic inversion operations needed in the expressions can be carried out such that they perform well. The particular polarizabilities of the biaxial chiral sphere are shown in component form. © 1994 John Wiley & Sons, Inc.
Reflection and mutual coupling in a special kind of parallelplate phased antenna arrays
Authors: Janssen J. M. W. M. , Jeuken M. E. J. 
Published: July 2007

AbstractAn infinite phased antenna array of plane parallel plate structures, where every other structure is short circuited at a distance t from the aperture, has been investigated. In the analysis, a modal matching technique has been applied. It can be concluded that both reflection and mutual coupling can be reduced considerably by properly selecting the choke depth t and the material inside the plane parallel plate structures and the chokes (er). © 1994 John Wiley & Sons, Inc.
A finite‐difference time‐domain method using whitney elements
Authors: Chan C. H. , Sangani H. , Yee K. S. , Elson J. T. 
Published: July 2007

AbstractA new finite‐difference time‐domain method is proposed. The key feature of this method is the use of Whitney‐element interpolation functions so that field values can be updated explicitly either by the differential or the integral form of Maxwell's equations. Numerical results are given for a 2D parallel‐plate waveguide. © 1994 John Wiley & Sons, Inc.
A novel broadband rectangular microstrip antenna element
Authors: Kara Mehmet 
Published: July 2007

AbstractThe design, fabrication, testing, and analysis of a new broadband rectangular microstrip antenna element resonating at 7.200 GHz is introduced and discussed. Measured data on the performance characteristics of the new antenna element are presented and compared with the characteristics of a conventional microstrip antenna element having the same dimensions. © 1994 John Wiley & Sons, Inc.
Broadband cylindrical‐rectangular microstrip antennas using gap‐coupled parasitic patches
Authors: Ke Shyh‐Yeong , Wong Kin‐Lu 
Published: July 2007

AbstractA broadband cylindrical‐rectangular microstrip antenna using two parasitic patches gap coupled to its radiating edges is studied by using a full‐wave analysis and a Galerkin's moment‐method calculation. Results indicate that, with parasitic patches, an antenna bandwidth greater than two times that of a single cylindrical‐rectangular patch antenna can be obtained. Details of the numerical results for different curvature radii and gap spacings are presented. © 1994 John Wiley & Sons, Inc.
MMIC broadband braided microstrip coupler
Authors: Willems David A. 
Published: July 2007

AbstractThis article presents a broadband quadrature coupler realized using a novel braided microstrip structure that consists of 64 air‐bridge crossovers. The test results of the 2.5–8‐GHz single‐section coupler fabricated on a 125‐μm‐thick GaAs substrate are presented. This coupler achieved better than 17‐dB return loss, 11 dB of isolation and ±0.75 of amplitude variation over the almost 2‐octave bandwidth. This bandwidth and performance are the best reported for a braided microstrip coupler. © 1994 John Wiley & Sons, Inc.
Automatic mesh generator based on self‐organizing finite‐element tessellation for three‐dimensional electromagnetic field problems
Authors: Jeong Bong‐Sik , Lee Soo‐Yound 
Published: July 2007

AbstractA three‐dimensional SOFT (self‐organizing finite‐element tessellation) mesh generator, based on self‐organizing topology‐preserving feature maps, is developed for electromagnetic field problems. A user‐supplied probability function controls the density of the graded mesh, and local mesh refinements are easily incorporated. © 1994 John Wiley & Sons, Inc.
Analysis of dielectric‐covered radiating slots in the ground plane of a microstrip line
Authors: Wong Kin‐Lu , Su Hsin‐Cheng 
Published: July 2007

AbstractThe dielectric overlay effects on the impedance properties of a radiating slot in the ground plane of a microstrip line are studied by using the reciprocity theorem and a moment‐method calculation. The Green's functions for the dielectric‐covered microstrip line‐fed radiating slot are given, and the expression for the slot impedance is shown. Numerical convergence of the moment‐method calculation using, respectively, piece‐wise sinusoidal basis functions and rooftop basis functions is discussed. Numerical results for the slot impedance as a function of overlay thickness and permittivity are presented and discussed. © 1994 John Wiley & Sons, Inc.
Fast multipole method solution using parametric geometry
Authors: Song J. M. , Chew W. C. 
Published: July 2007

AbstractThe fast multipole method is used to solve the electromagnetic scattering from three‐dimensional conducting bodies of arbitrary shape. The electric field integral equation is discretized by the method of moments. Instead of directly computing the matrix‐vector multiplication, which needs N2multiplications, this approach reduces the complexity to O(N1.5). © 1994 John Wiley & Sons, Inc.
A new face‐centered‐cubic photonic crystal for microwave and millimeter‐wave applications
Authors: Brown E. R. , Agl K. , Dill C. , Parker C. D. , Malloy K. J. 
Published: July 2007

AbstractThree‐dimensional photonic crystals are fabricated that consist of a face‐centered‐cubic lattice of air atoms embedded in a synthetic dielectric matrix. The crystals are formed by stacking triangular arrays of cylindrical atoms in a close‐packed arrangement. The fabrication technique is much simpler than previous methods and is well suited to producing photonic band gaps in the microwave and millimeter‐wave regions. Microwave measurements provide strong evidence for a photonic band gap between approximately 17 and 18 GHz in a crystal having a volumetric air fraction of 60%. © 1994 John Wiley & Sons, Inc.
Multilevel evaluation of electromagnetic fields for the rapid solution of scattering problems
Authors: Michielssen Eric , Boag Amir 
Published: July 2007

AbstractA multilevel algorithm is presented for evaluating fields generated by given distributions of electric current. The algorithm can be used to accelerate the solution of scattering problems using the method of moments and/or boundary element methods. The algorithm exploits the limited number of degrees of freedom that characterize a field observed over a domain that is well separated from a source domain. Both the memory requirements and the computational complexity of the algorithm are O(Nslog(Ns)), where Nsis the common number of sources and observation points. The multilevel algorithm can easily be incorporated into existing method‐of‐moments (MoM) programs. A simple physical interpretation of the algorithm is provided. © 1994 John Wiley & Sons, Inc.
A kinoform for the spatial distribution of a gaussian beam at millimeter wavelengths
Authors: Delgado Guillermo F. , Bengtsson Jörgen 
Published: July 2007

AbstractA kinoform to produce an array of 4 × 4 equal‐intensity Gaussian beams from a single Gaussian beam has been designed, manufactured, and evaluated at 100 GHz. The kinoform was fabricated by milling a Teflon plate, and symmetry of the amplitude distribution and a binary phase control were used to obtain a simple phase relief surface. The measured diffraction efficiency is about 95%. © 1994 John Wiley & Sons, Inc.
Analysis of superconductive interconnects by the finite‐difference‐time‐domain method
Authors: Wang Bing‐Zhong 
Published: July 2007

AbstractA methodology is described for the analysis on superconductive interconnects. First, the time‐domain impedance boundary condition (TDIBC) of a superconductor is obtained from its frequency‐domain counterpart. Next, discretization of the TDIBC is presented in the context of the finite‐difference—time‐domain (FDTD) technique. The FDTD solutions for a superconductive parallel‐plate transmission line are in good agreement with the exact solutions. Finally, the transmission property of a superconductive via is analyzed by the FDTD method. © 1994 John Wiley & Sons, Inc.
Microstrip‐slot and coplanar waveguide‐slot lines with very high dielectric constant substrates for application in high‐speed optoelectronics
Authors: Carvalho M. C. R. , Margulis W. , Souza J. R. 
Published: July 2007

AbstractThis article shows that the microstrip‐slot line and the novel coplanar waveguide‐slot line printed on substrates with very high dielectric constant (εr = 38 and ε = 80) are ideal for the construction of the microwave circuitry within packages of optoelectronics components. These combined transmission lines allow the realization of impedance levels not achieved with conventional structures on such substrates, due to small, unfeasible transversal dimensions. The spectral domain approach is used in the analysis of the transmission lines. The adequacy of the analysis is confirmed experimentally. © 1994 John Wiley & Sons, Inc.
Slow‐wave characteristics of coplanar meander transmission lines with dielectric substrate
Authors: Görür A. , Karpuz C. 
Published: July 2007

AbstractWe report the reduction factor in velocity of a meander coplanar transmission line on dielectric substrates. A simple analysis of this device that can be used to reduce the size of microwave integrated circuits has been carried out by using CAD packages. A size‐reduction factor of approximately 4–5 has been obtained. © 1994 John Wiley & Sons, Inc.