bluuebunny/crossref_metadata_2025_split huggingface dataset:
A study of optically controlled millimeter‐wave propagation characteristics in a metallic rectangular waveguide loaded with double dielectric layers
Authors: Zhiyuan Yu , Welgan Lin 
Published: July 2007

AbstractThis article presents the theoretical analysis of a new optically controlled metallic waveguide structure loaded with double dielectric layers in H face. This structure shows higher optical sensitivity than that loaded with a homogeneous semiconductor dielectric layer. It can give an optically controlled phase shift greater than 4000 deg/cm and an optically controlled attenuation of more than 200 dB/cm.
Lithium niobate traveling‐wave phase modulator with an indium tinoxide buffer layer
Authors: Chang Wen‐Chung , Chuang Wei‐Ching , Wang Way‐Seen 
Published: July 2007

AbstractCharacteristics of traveling‐wave phase modulators fabricated with indium tinoxide (ITO) and silicon dioxide (SiO2) as buffer layers on Z‐cut LiNbO3 substrate are compared at the wavelength 0.6328 μm. For those with an ITO buffer layer, a half‐wave voltage of 8.1 V and a bandwidth of 10 GHz are obtained, whereas for those with an SiO2 buffer layer, a half‐wave voltage of 9.6 V and bandwidth 11 GHz are obtained. Hence the use of an ITO buffer layer may cause a reduction of the driving voltage and be capable of broadband operation.
A closed‐form multidimensional free‐space green's function by the path‐integral method
Authors: Huang Chenhong , Nevels Robert D. 
Published: July 2007

AbstractA closed‐form multidimensional free‐space Green's function for the Helmholtz equation is obtained by the path‐integral method. The path‐integral method is novel and the general closed‐form free‐space Green's function is a useful expression which is not widely known.
Broadband horizontally polarized omni antenna
Authors: Misra V. C. , Pal Ram , Dey K. K. 
Published: July 2007

AbstractHorizontally polarized omnidirectional characteristics in planes of arrays have been achieved with a 32 element circular array. The element incorporated is a printed circuit tapered slot radiator in a strip‐line configuration. This array was excited in cophase condition and was evaluated over the 6–18‐GHz frequency band. It was observed that the omni variation in the horizontal plane is within ±3 dB over the frequency band.
FD‐TD analysis of open cylindrical dielectric resonators
Authors: Shen Ying , Bi Zhiqiang , Wu Keli , Litva John 
Published: July 2007

AbstractDifferent structures of open dielectric resonators (DR), which include isolated DRs, tuning‐screw DRs, and semiopen supported DRs on a microstrip substrate, are analyzed using the finite‐difference time‐domain method with the efficient numerical integration fourier transform. The numerical results are in very good agreement with the available theoretical solutions and the experimental results.
Dispersion characteristics of open microstrip transmission lines printed on biaxially anisotropic substrates
Authors: Chen Yinchao , Beker Benjamin 
Published: July 2007

AbstractThe dyadic Green's function for an open single microstrip line and a coupled stripline, printed on a homogeneous anisotropic substrate characterized by both its biaxial permittivity and permeability tensors, is rigorously formulated in the Fourier‐transformed domain. The dispersion properties of these transmission lines are examined for different material parameters and several sizes of the geometry. The numerical results show that the addition of the magnetic anisotropy to the substrate material has a significant influence on the propagation characteristics of the microstrip transmission line.
A new approach to the analysis of the soliton: Nonuniform finite difference beam propagation method
Authors: Liu Shuh‐Fang , Wei Pei‐Kuen , Wang Way‐Seen 
Published: July 2007

AbstractA finite difference beam propagation method with nonuniform discretization is presented and validated for the analysis of solitary waves. We verify the accuracy of our nonuniform finite difference beam propagation method by demonstrating the evolution of the well‐known N soliton in nonlinear dispersive medium with and without higher‐order perturbed terms. Comparisons with the standard beam propagation method for calculation of both bright and dark solitons are also given and show that the nonuniform finite difference method is good for saving computing time, while maintaining the desired accuracy.
Fabrication of strip loaded outdiffusion guides on lithium niobate substrate
Authors: Lau Chi‐Sang , Wei Pei‐Kuen , Su Chi‐Wu , Wang Way‐Seen 
Published: July 2007

AbstractA fabrication method of strip‐loaded waveguide on lithium outdiffused lithium niobate substrate is presented. The fabricated waveguide provides good characteristics, such as single transverse magnetic (TM) or electric (TE) polarization and without having a thick surface guide on the substrate. Also it takes less time to fabricate the waveguide, and hence, less damage on the substrate is expected. A numerical simulation shows that the normalized amplitude contours of the fundamental waveguide mode can be expanded for efficient fiber coupling or condensed for enhancing the electro‐optic effect depending on the refractive index of the loaded strip. The output power profile of the waveguide, detected by a linear array of charge coupled devices, is in good agreement with that calculated numerically. © 1992 John Wiley & Sons, Inc.
Two‐dimensional inner‐product model for auto‐hetero‐associative memory and its new optoelectronic implementation
Authors: Zhang Jiajun , Zhang Li , He Anzhi , Yan Dapeng 
Published: July 2007

AbstractThe associative memory of the two‐dimensional (2‐D) Hopfield model described in terms of inner product is realized by using a multiimaging hybrid system and an incoherent correlation hybrid system, respectively. A new method, in which polarization coding and half wave plate are employed, is proposed to encode the bipolar data in memory masks. Four 8 × 8 images are used in our experiment, and the experimental results agree well with the numerical simulations. On the basis of this, we also present the inner‐product expression of the modified Hopfield model for the heteroassociative memory which can be implemented in the same system described for autoassociation, as long as the first memory mask is changed and the thresholds in the feedback are adjusted accordingly. © 1992 John Wiley & Sons, Inc.
Microstrip spatial filters for the H‐plane pattern control of microstrip antennas
Authors: Bonvin F. , Bokhari S. A. , Zürcher J. F. , Gardiol F. E. 
Published: July 2007

AbstractA technique for shaping the H‐plane pattern of a microstrip antenna using a passive unequally spaced planar array of printed strips as a superstrate layer is presented. By a proper choice of the number of strips, their widths, and their relative positions, quasiomnidirectional radiation patterns and radiation patterns with a dip on boresight have been realized. A two‐dimensional model for the analysis and design is presented. © 1992 John Wiley & Sons, Inc.
Direct evidence of the quasibound‐state lifetime effect in resonant tunneling from impedance measurements
Authors: Vanbesien O. , Sadaune V. , Lippens D. , Vinter B. , Bois P. , Nagle J. 
Published: July 2007

AbstractSmall‐signal impedance measurements of GaAs/AlGaAs double‐barrier resonant tunneling heterostructures are analyzed in terms of equivalent circuits taking into account the quasibound‐state lifetime. The lifetime values extracted from experiments are in reasonable agreement with those deduced from calculation of quantum transmission probabilities. © 1992 John Wiley & Sons, Inc.
A CAD formula for microstrip dispersion
Authors: Roy Jibendu Sekhar , Jecko Bernard 
Published: July 2007

AbstractAn expression for the effective relative dielectric permittivity of microstrip transmission lines, derived empirically for X‐band of frequency, is proposed for the computer‐aided design (CAD) of micro‐strips in higher microwave frequencies as well, by comparing with other CAD formulas. The accuracy and simplicity of the formula can demand priority in CAD technology. © 1992 John Wiley & Sons, Inc.
Simple expressions for diffraction loss in open resonators
Authors: Arora R. K. , Mongia R. K. 
Published: July 2007

AbstractIn this article simple closed‐form are presented expressions to compute the diffraction loss of open resonators composed of spherical mirrors of circular cross‐section. These expressions, which are based on the numerical results of scalar theory, should be useful in designing mirror size for open resonators. Experiments are conducted at W band to demonstrate the accuracy of the expressions. © 1992 John Wiley & Sons, Inc.
Synthesis of 1‐D phase profiles with variable optical path
Authors: Ojeda‐Castañeda Jorge , Arrizón Victor 
Published: July 2007

AbstractWe describe a simple, novel method for generating 1‐D phase profiles with variable optical path. 2‐D planar curves are used as input objects, and a narrow slit as a spatial filter. The output is a transparent structure with variable optical path difference. Experimental results are shown. © 1992 John Wiley & Sons, Inc.
Radiation efficiency and the gain of a source inside a two‐layered grounded dielectric structure
Authors: Bhattacharyya Arun K. 
Published: July 2007

AbstractRadiation characteristics of a source inside a two‐layered grounded dielectric structure are presented. The space and surface wave fields generated by the source are obtained by employing the integral transformation technique. The directivity and the radiation efficiency are found to be maximum for certain thicknesses of the dielectric layers. The overall gain differs considerably from the directive gain, due to the surface wave loss. The bandwidth is found to decrease with the increase in the gain of the structure. © 1992 John Wiley & Sons, Inc.
Printed‐circuit dipole antenna for personal communication network handset
Authors: Yu Cheng‐Cheh , Ju Kung‐Min 
Published: July 2007

AbstractA shortened dipole antenna using meander line is designed for the personal communication network (PCN) handset operating at center frequency f0 = 880 MHz. The shortened dipole antenna is printed on a Duroid 6010 substrate with dielectric constant εr = 10.5 and thickness = 25 mils. A shortening ratio (SR) of 45.9% is experimentally achieved with the printed‐circuit dipole antenna (PCDA) of 9.2‐cm length as compared to the λ0/2 linear dipole antenna. Owing to the planar, lightweight, thin, and small characteristics, the PCDA using meander line is well suited for signal transmission and reception of the PCN handset, in which it may be built in, and various antenna diversity schemes for fading reduction may be utilized. © 1992 John Wiley & Sons, Inc.
Physical optics and GTD time‐domain scattering from a finite PEC cylinder with one end open and one end closed
Authors: Kahler Barton D. , Bhattacharyya Asoke K. 
Published: July 2007

AbstractExpressions for time‐domain (TD) scattered fields from a finite perfectly electrically conducting (PEC) cylinder with one end open and one end closed have been obtained using time‐domain physical optics (TDPO) and time‐domain geometrical theory of diffraction (TDGTD). The TDGTD coefficient according to Veruttipong has been used to calculate the TDGTD scattered fields. Important results including a comparison of the TDPO and TDGTD results are discussed. Some closed‐end scattering results of the cylinder have been compared with Dominek's recent investigations on disk scattering and are found to agree. © 1992 John Wiley & Sons, Inc.
Noise analysis of a nonlinear microwave circuit driven by a noisy sinusoidal source
Authors: Rizzoli Vittorio , Masotti Diego , Mastri Franco , Neri Andrea 
Published: July 2007

AbstractThe Letter introduces a general algorithm for the noise analysis of a nonlinear circuit operated in large‐signal time‐periodic conditions and fed by a noisy sinusoidal source. The algorithm is based on the piecewise harmonic‐balance technique, and thus retains all the typical advantages of frequency‐domain simulation. The statistical description of the noisy source, which is required to make a rigorous analysis possible, is discussed in detail. It is also shown that quite acceptable, though approximate, results can be derived on the basis of reduced statistical information consisting of the easily measurable PM and AM noise only. © 1992 John Wiley & Sons, Inc.
Electrostatic image theory for the dielectric sphere with an internal source
Authors: Sten Johan C.‐E. , Lindell Ismo V. 
Published: July 2007

AbstractThe electrostatic image theory for a point charge next to the conducting sphere, originally discovered by Lord Kelvin, was recently generalized to the dielectric sphere with external sources by one of the present authors. This article treats the corresponding problem of a source located inside the dielectric sphere, thus completing the theory. Image expressions corresponding to potentials both outside and inside the sphere are worked out and their validity is checked with numerous tests. The present theory can be applied for small dielectric spheres with internal sources or scatterers. © 1992 John Wiley & Sons, Inc.
Coherent inelastic scattering by an arbitrary body uniformly filled with active molecules
Authors: Hau Jin , Wang Zhf‐Liang , Lin Wel‐Gan 
Published: July 2007

AbstractA new formulation for coherent inelastic scattering by an arbitrary body uniformly filled with active molecules is obtained by the extended boundary condition method and a particular solution of the nonhomogeneous wave equation for the inelastic electric field inside the body due to the existence of active molecules is included. The agreement between the current results for coherent inelastic scattering by a sphere uniformly filled with active molecules and the exact resuits shows the current formulation is not restricted to the case of weak scattering. © 1992 John Wiley & Sons, Inc.
Analysis of microstrip circular rings for MIC, MHMIC, and MMIC components
Authors: Xu Yansheng , Bosisio Renato G. 
Published: July 2007

AbstractIn this article the characterization of planar structures using the method of lines in cylindrical coordinates is presented. The capacitance of different segments of a miscrostrip circular ring is studied: special attention is given to edge stray capacitances. This method of calculation can find applications in the characterization of microstrip components in MIC, MHMIC, and MMIC with shapes easily fitted to cylindrical coordinates (e.g., circular ring, fan shape, etc.). © 1992 John Wiley & Sons. Inc.
A polarization approach for quasioptical phase measurement
Authors: Sjogren L. B. , Liu H.‐X. L. , Luhmann N. C. 
Published: July 2007

AbstractA technique has been developed for measurement of the phase of reflection and transmission coefficients for single‐axis millimeterwave quasioptical systems. The method is verified by measurements of dielectric‐mounted strip arrays. Application of the method to monolithic millimeter‐wave diode arrays is discussed. © 1992 John Wiley & Sons, Inc.
Tapered corrugation for improving characteristics of DFB and DBR lasers
Authors: Bakhtazad A. , Abiri H. , Rahnavard M. H. 
Published: July 2007

AbstractIn DFB and DBR lasers, phase of corrugation at the reflective end and possible change of reflectivity at the facets may alter the conditions of oscillation. The purpose of tapering at the grating is to reduce these effects. In addition, with dissimilar tapering, we can increase mode selectivity of such lasers. In this article we consider the reflection coefficient of tapered DBR as a function of end facet reflection coefficient, and deviation from the Bragg wavelength. It is shown that tapering improves the operation of DFB and DBR lasers. © 1992 John Wiley & Sons, Inc.
Free‐carrier and thermal grating effects in gallium phosphide
Authors: Shimura T. , Boothroyd S. A. , Chrostowski J. 
Published: July 2007

AbstractWe report the first observation of the simultaneous creation and competition between a free‐carrier light‐induced diffraction grating and an accompanying thermal grating in gallium phosphide. The lifetimes of the two gratings are widely different and the nonlinear index n2 = 1 × 10−11 cm2/W for the free‐carrier grating is almost an order of magnitude larger than the thermal effect of a 100‐psec mode‐locked pulse. © 1992 John Wiley & Sons, Inc.
An application of physical optics for near‐field monoor bistatic diffraction calculations
Authors: Pouliguen P. , Desclos L. 
Published: July 2007

AbstractIn this article the analytical solution of physical optics in near field for a perfectly conducting body is obtained. The mono‐ and bistatic cases are shown and compared with other theoretical techniques. This approach is new und permits deeper investigation of a variety of problems such as radar cross‐section (R.C.S.) and antenna calculations or measurements. © 1992 John Wiley & Sons. Inc.
Effects of substrate anisotropy on coupled bilateral finlines
Authors: Ho Thinh Quoc , Beker Benjamin 
Published: July 2007

AbstractThe spectral‐domain method is used to study coupled bilateral fin lines on uniaxial and biaxial substrates. New results describing dispersion characteristics of both the even and odd modes, including the effects of the misalignment between the waveguide coordinate system and that of a substrate, are also provided. © 1992 John Wiley & Sons, Inc.
Wave propagation in a radially inhomogeneous cylindrical dielectric structure: A general analytical solution
Authors: Neves Isabel V. , Fernandes António S. C. 
Published: July 2007

AbstractAnalytical solutions for wave propagation in a general inhomogeneous dielectric medium in a cylindrical coordinate system are presented. The solutions are built using series expansions of the Frobenius and Taylor types. The former includes the Bessel functions in a homogeneous medium; the latter seems to be new and allows the construction of a general and fast convergent algorithm for computing the modal characteristics. A simple criterium for hybrid mode classification is also presented. © 1992 John Wiley & Sons, Inc.
Analysis of microstrip‐microslot applicator for biomedical applications
Authors: Dubois L. , Cresson P. Y. , Pribetich J. , Chive M. 
Published: July 2007

AbstractWe propose to investigate planar applicators and, more specifically, microstrip‐microslot applicators laid on multtiayered lossy media and covered or not with a dielectric protective layer. Using the two‐dimensional spectral domain approach (SDA), we obtain the complex resonant frequency Fc. Comparison with the experiment shows that this analysis improves the previous one‐dimensional modelization. © 1992 John Wiley & Sons, Inc.
Ferrite analysis using the finite‐difference time‐domain (FDTD) method
Authors: Reineix A. , Monediere T. , Jecko F. 
Published: July 2007

AbstractThis article introduces a new method for analyzing ferrite structures. This method is implemented in a FDTD algorithm; then the computation is directly made in the time domain. An application in the particular case of a two‐dimensional problem is presented. Comparison with results obtained using the Polder tensor are made in order to validate the method. © 1992 John Wiley & Sons, Inc.
Optimum design of mesfet mixers using a quasianalytical technique
Authors: Cayrou J. C. , Gayral M. , Tronche C. , Pouysegur M. , Graffeuil J. , Sautereau J. F. 
Published: July 2007

AbstractA quasianalytical MESFET mixer design method based on a two‐dimensional Fourier transform and appropriate simplifying assumptions concerning the MESFET model used is described. As an example the amplitude contents of mixing products together with optimum bias conditions and LO level for maximum conversion gain are derived for a gate mixer and compare well with the results given by a commercial harmonic balance simulator. © 1992 John Wiley & Sons, Inc.
Wideband microstrip dipole
Authors: Dey Supriyo , Aanandan C. K. , Jose K. A. , Mohanan P. , Nair K. G. 
Published: July 2007

AbstractThe design details of a new wideband half‐wave microstrip dipole antenna, suitable for low‐frequency operation, having more than 5% 2:1 VSWR bandwidth, are presented. The bandwidth enhancement is achieved by proper end‐loading of the dipole arms. The design includes stripline feeding mechanism to avoid unwanted radiation from the feeding structure. © 1992 John Wiley & Sons, Inc.
Perturbation theory for a corrugated waveguide with a bi‐isotropic ROD
Authors: Viitanen Ari J. , Lindell Ismo V. 
Published: July 2007

AbstractDetermination of the material parameters for a general bi‐isotropic medium with a waveguide technique is considered. The bi‐isotropic medium is in general nonreciprocal; the amount of nonreciprocity can be determined by measuring the frequency difference between an empty cavity resonator and a cavity resonator with a small bi‐isotropic sample. The chirality of the medium cannot be determined with such a method. Also, the method based on measuring the propagation factor of a perfectly conducting waveguide with a bi‐isotropic rod gives no information about the chirality parameter. It can, however, be determined by measuring the change of the propagation factor in a corrugated waveguide with and without a bi‐isotropic rod by using two different modes propagating in a corrugated waveguide. © 1992 John Wiley & Sons, Inc.
Electromagnetic coupling to a nonuniform transmission line consisting of two angled wires
Authors: Hong Sung‐Yong , Ra Jung‐Woong , Kim Se‐Yun 
Published: July 2007

AbstractA new method is developed to analyze electromagnetic coupling to an angled two‐wire transmission line. It consists of solving the cylindrical transmission line equations analytically, and then adjusting the involved parameters to support the cylindrical TEM mode along its equivalent model of the angled two‐plate transmission line. The validity of the derived solution is assured by showing its convergence to the numerical value obtained by using the circuit concept approach. © 1992 John Wiley & Sons, Inc.
Modeling of gunn domain effects in the output conductance of the high‐frequency small‐signal GaAs MESFET equivalent circuit
Authors: Magerko Mark A. , Chang Kai 
Published: July 2007

AbstractA time‐delay element associated with the output conductance has been included in the small‐signal GaAs MESFET equivalent circuit to model Gunn domain effects. From experimental data collected to 36 GHz, these effects primarily contribute to decrease of the output conductance (gds) with increasing frequency which significantly affects the magnitude of the S‐parameter S22. © 1992 John Wiley & Sons, Inc.
A novel architecture of a balanced fiber‐optic communication link for laser rin reduction
Authors: Madjar Asher , Malz Oded 
Published: July 2007

AbstractThis article presents a novel architecture of a balanced optical communication link intended to reduce the effect of the transmitter laser RIN on the total noise figure and dynamic range of the link. The degree of noise reduction depends on the balancing of amplitude and phase in the two arms of the link and on the modulation frequency relative to the laser relaxation oscillation frequency. © 1993 John Wiley & sons, Inc.
Optical control of pseudomorphic HEMT‐based MMIC oscillators
Authors: Bangert A. , Rosenzweig J. , Hülsmann A. , Kaufel G. , Köhler K. , Schneider J. 
Published: July 2007

AbstractExperimental results on direct and indirect optically controlled monolithically integrated oscillators will be presented. The oscillators had a free‐running frequency around 7 GHz. The experimental results show that the indirect optically controlled circuits seem to be more effective in controlling the phase of the output signal. © 1993 John Wiley & sons, Inc.
Wavefields of hypergaussian screens
Authors: Ojeda‐Castañeda J. , Löpez‐Olazagasti E. 
Published: July 2007

AbstractWe present an analytical formula that describes the wavefield behind a screen, whose amplitude transmittance is a hyper‐Gaussian function of any order n. Our results suggest a method for achieving high irradiance concentrations. © 1993 John Wiley & sons, Inc.