bluuebunny/crossref_metadata_2025_split huggingface dataset:
A spectral‐domain method for the analysis of the fundamental‐mode leakage effect in microstrip lines on uniaxial substrates
Authors: Michalski Krzysztof A. , Zheng Dalian 
Published: July 2007

AbstractA simplified spectral‐domain integral‐equation method is applied to analyze the recently discovered fundamental mode leakage effect in open microstrip transmission lines with uniaxial substrates.
A series‐biased distributed amplifier for high‐efficiency applications
Authors: Willems David , Bahl Inder , Wirsing Kelly 
Published: July 2007

AbstractThis article presents a novel circuit configuration which combines a high‐voltage dc bias network with a distributed‐amplifier topology. This type of circuit offers multioctave bandwidth and improved efficiency in systems by reducing dc power consumption where the primary dc power is at voltage levels higher than required operating voltage for the active devices.
On‐axis cross‐polarization discrimination of reflector antennas with random surface errors
Authors: Herben M. H. A. J. 
Published: July 2007

AbstractAn approximate formula is derived for the on‐axis cross‐polarization discrimination (XPD) of a symmetrical reflector antenna with random surface errors. This XPD depends on only two parameters, namely, the normalized r.m.s. surface error (ϵ/λ) and the polarization‐loss efficiency (n).
Image classification by the Kittler‐Young transform using A joint transform correlator
Authors: Li John X. , Yu Francis T. S. , Gregory Don A. 
Published: July 2007

AbstractThis article will discuss a two‐category image classification which has been performed on a joint transform correlator (JTC) by using the Kittler‐Young transform. The property of optimally utilizing the class means and variances in the Kittler‐Young transform has enabled a high space‐bandwidth‐product operation. The digitizing effect of the liquid crystal television has been utilized to increase the correlation peaks.
Empirical expressions for the input impedance of rectangular microstrip antennas
Authors: Deb D. , Gupta A. , Das S. , Palit D. , Bhattacharjee A. K. 
Published: July 2007

AbstractClosed‐form expressions for the input impedance of half‐wavelength rectangular microstrip antennas fed by a coaxial line at the center of one of the radiating edges and open‐circuited at one of the ends are derived. Good agreement between computed and measured data is obtained.
Microstrip resonator on anisotropic substrate in a shielding waveguide
Authors: Cheng Dajun , Xue Liangjin 
Published: July 2007

AbstractThe dyadic Green's function in the Fourier‐transform spectral domain for a microstrip patch on an anisotropic substrate in a shielding rectangular waveguide is presented. Numerical data for resonant frequencies are provided using Galerkin's method in the spectral domain and Parseval's theorem.
Horn antenna with suppressed sidelobe level
Authors: Odendaal J. W. , Pistorius C. W. I. 
Published: July 2007

AbstractA method whereby the sidelobe level of the radiation pattern of a horn antenna can be reduced is proposed. The sidelobes are reduced by curving the edges in the aperture of the antenna. Radiation patterns of regular and modified horns were calculated with GTD and compared with measured results.
Hot electron microwave incremental conductivity characteristics of cadmium telluride
Authors: Chakrabarty D. , Mukherjee M. K. , Mukhopadhyay D. 
Published: July 2007

AbstractThe incremental microwave mobility values for electrons in the presence of a large applied dc field have been calculated in cadmium telluride, assuming a displaced Maxwellian distribution function for the energy of the electrons. It is found that both the real and imaginary parts of the parallel and perpendicular microwave mobility decrease monotonically with the applied dc field. The imaginary part of the microwave mobility, which is a measure of the contribution of free carriers to the dielectric constant, is higher in this material than in III‐V compound semiconductors and shows a peak in the submillimeter‐wavelength range.
Frequency‐domain nonlinear analysis of microwave circuits using frequency‐domain diode model
Authors: Liang Han , Yunyi Wang , Sifan Li 
Published: July 2007

AbstractThis article presents a new nonlinear analysis method of the microwave circuits under multitone excitation. A frequency‐domain diode model and an adaptable spectral balance algorithm are first proposed and the full nonlinear analysis is performed entirely in the frequency domain for a microwave mixer driven by multitone signals. Some frequency‐conversion performances of mixer are investigated in detail.
Quasi‐TEM analysis of the generalized microstrip line by using FFT and iterative methods
Authors: Drake Enrique , Medina Francisco , Horno Manuel 
Published: July 2007

AbstractA quasi‐TEM analysis of a generic microstrip line is carried out by the combined use of iterative methods and FFT. Asymptotic extraction techniques are used in the determination of the Green's function, allowing reduction of memory storage requirements and CPU time. Several iterative algorithms are compared for solving the final system of convolution linear equations. Numerical results are presented and compared with published data.
Efficient implementation of the finite element method for the rigorous analysis of complex boxed planar resonators
Authors: Railton C. J. 
Published: July 2007

AbstractThe accurate analysis of complex planar resonators using the finite element method often requires the evaluation of the elements of a large matrix. This is computationally expensive. In this contribution it is shown that by using the fast Fourier transform together with asymptotic forms of the Green's function the computation time can be greatly reduced allowing the solution of relatively complex problems on a small computer.
High performance MESFET power amplifiers for high volume application in KA band
Authors: Mondal J. , Carlson D. , Pulver C. , Vickberg M. , Geddes J. 
Published: July 2007

AbstractA very repeatable MBE power MMIC process has been developed for low‐cost and high‐volume Ka‐band applications. The RF yield under power drive has reached more than 60%. The power out in a balanced configuration was 300 mW with 18% power added efficiency at 30 GHz.
Coplanar waveguide‐fed microstrip antennas
Authors: Aksun M. I. , Chuang S. L. , Lo Y. T. 
Published: July 2007

AbstractA microstrip antenna fed by a coplanar waveguide is investigated using a full‐wave analysis based on the method of moments in the spectral domain. The surface current density on the microstrip antenna and the field distribution in the slots of the coplanar waveguide are represented by entire domain and subsectional basis functions. The reflection coefficient referenced on the coplanar waveguide is calculated and compared to the experimental results.
Thin‐wire Yagi antenna radiation patterns using the finite‐difference time‐domain method
Authors: Boonzaaler J. J. , Pistorius C. W. I. 
Published: July 2007

AbstractThe radiation patterns of thin‐wire Yagi antennas are computed using the finite‐difference time‐domain method. The radiated time‐do main fields are transformed to the frequency domain and then compared to the frequency‐domain results obtained from the method of moments.
A six‐port technique application of measuring complex permittivity and permeability
Authors: Jiang Cao , Jia Sun , Zhang Qishao 
Published: July 2007

AbstractA six‐port technique is presented for simultaneous measurement of complex permittivity and permeability of a given material. A dual six‐port network analyzer is employed to measure the scattering parameters. The complex permittivity and permeability are computed from the scattering parameters of a transmission line filled with the material to be tested. Measured ϵr, μr, data for Teflon agree well with known values. The identical samples are measured with a six‐port ANA and an automatic network analyzer, HP8510B. The measured data of the six‐port ANA and the HP8510B agree well with each other by comparison.
Measurement of electro‐optic effects in acrylic plastic
Authors: Ishii T. Koryu , Griffis Andrew 
Published: July 2007

AbstractThe quadratic electro‐optic effect in commercial acrylic plastics was determined. The induced birefringence in the Plexiglas was measured to be 2.47 × 10−7 and the resultant Kerr constant was 3.52 × 10−14 m/V2 for an electric field intensity of 3.33 × 106 V/m.
A novel approximation method for asymmetrical coplanar lines
Authors: Chang Jiunn‐Jye , Wang Way‐Seen 
Published: July 2007

AbstractIn this article a novel approximation method is proposed to calculate the quasi‐TEM parameters of asymmetrical coplanar lines. The method is based on simulating an asymmetrical coplanar line with two symmetrical ones. The line parameters of asymmetrical coplanar waveguides calculated using the proposed method are presented and a comparison between the calculated and available results shows good agreement.
Conservation of energy for a weakly irregular, open‐ or close‐bounded dispersive medium
Authors: Schill Robert A. 
Published: July 2007

AbstractA variational technique is used to develop an energy‐conservation theorem for a dispersive, anisotropic medium bounded by a weakly irregular open or closed structure. The weakly active/dissipative medium supports growing/decaying waves. Corrections in wave number and frequency are dependent on the instability properties of the wave for the open structure. New contributions to the power flux density and energy density result. For open and closed structures, the ratio of the corrections in wave number and frequency is dependent on the reactive properties of the structure walls. Effective wall‐resistance contributions for open structures further modify this ratio. Mode‐coupling and growth‐rate relationships are examined.
Application of the extended boundary condition method to monte carlo simulations of scattering of waves by two‐dimensional random rough surfaces
Authors: Tsang L. , Lou S. H. , Chan C. H. 
Published: July 2007

AbstractThe extended boundary condition method is applied to Monte Carlo simulations of two‐dimensional random rough surface scattering. The numerical results are compared with one‐dimensional random rough surfaces obtained from the finite‐element method. It is found that the mean scattered intensity from two‐dimensional rough surfaces differs from that of one dimension for rough surfaces with large slopes.
A microstrip coupler through a narrow slot in the common ground plane of a two‐sided microstrip circuit board
Authors: Lin C. C. 
Published: July 2007

AbstractAn empirical design of a microstrip coupler through a narrow slot in the common ground plane of a two‐sided microstrip circuit board is presented. The power transmission between a microstripline on a high‐permittivity ceramic substrate (εr = 9.8) and one on a low‐permittivity Teflon‐based substrate (εr = 2.2) is measured at near‐millimeter‐wave frequencies for a varying slot length. It is demonstrated that such a contactless transition can successfully be used with an acceptable loss in order to couple the power from one side to the other of a two‐sided microstrip circuit board.
Optical demonstration of the hartline lateral inhibition model
Authors: Zhou Changhe , Liu Liren , Wang Zhijiang 
Published: July 2007

AbstractThe Hartline model is an important neural network model which reveals the lateral inhibition in neural systems. In this article an optoelectronic architecture is proposed for implementing the Hartline model, in which an incoherent optical convolutor is used for the realization of the convolution operation and a polarization‐coding method for the representation of the connection weights in the Hartline model. The subtraction is performed by electronics. Preliminary optical edge‐enhancement experiments for two‐dimensional images illustrate the versatility of the network.
Calculation of characteristic impedance of broadband tem cell (BTEM cell)
Authors: Huang Kama , Lin Weigan 
Published: July 2007

AbstractThe main section of a newly appearing broadband TEM cell (BTEM cell) can be mapped into a cylinder via conformal transformation in three dimensions. Its outer conductor is approached by using an upper rectangular conductor from above and by a lower rectangular conductor from below; then the maximum and the minimum values of characteristic impedance are calculated. The average of the two extreme values is in good agreement with the actual characteristic impedance when the flared angles is small.
A ka‐band low‐noise hybrid amplifier
Authors: Holzman Eric L. 
Published: July 2007

AbstractThe design, fabrication, and performance of a Ka‐band, two‐stage, low‐noise hybrid amplifier (LNA) are discussed. The LNA's extremely wide‐band measured performance is state of the art with a gain exceeding 10 dB from 14 to 37 GHz and a noise figure less than 3 dB from at least 27 to 37 GHz.
High‐power microwave bipolar transistor modeling
Authors: Asensio Alberto , Pérez Félix 
Published: July 2007

AbstractThis article introduces a model for high‐power microwave bipolar transistors and its associated parameter‐measuring strategy, whose inclusion of thermal phenomena in the dc characterization allows a good estimate of the device's thermal resistance to be obtained. This type of model provides important capabilities for solid‐state radar transmitter design.
The finite‐element analysis of slider‐induced convection in two‐phase lpe growth system
Authors: Chao Fang‐Lin , Wang Way‐Seen 
Published: July 2007

AbstractIn this study, the finite‐element method is used to simulate the steady‐state slider‐induced convection of the confined melt cavity. The flux distribution within the melt cavity is analyzed and the relative momentum transfers on the poly GaAs melt and GaAs‐melt interface are calculated for several kinds of cavity geometries. It is found that the amount of momentum transfer is related to the skew angle of the cavity, and therefore, proper choice of the cavity angle is needed.
Study of slits in microstrip ring resonators for microwave and optoelectronic applications
Authors: Gopalakrishnan Ganesh K. , Chang Kal 
Published: July 2007

AbstractDistributed transmission line theory is used to accurately model microstrip ring resonator circuits. The dependence of the resonant modes on the azimuthal position of slits in the ring resonator is clearly demonstrated. The results form the basis for the design of resonators for microwave and optoelectronic applications.
Plane‐wave reflection from a bi‐isotropic (nonreciprocal chiral) interface
Authors: Lindell Ismo V. , Sihvola Ari H. , Viitanen Ari J. 
Published: July 2007

AbstractReflection dyadic for an incident plane wave reflecting at a planar interface between isotropic and bi‐isotropic (nonreciprocal chiral) half spaces is presented. The result generalizes earlier expressions for Fresnel's formulas for different isotropic and chiral half spaces and is roughly of the same order of complexity as that for the reciprocal chiral half space.
On a simple diffraction tomography technique based on a modified newton‐kantorovich method
Authors: Takenaka Takashi , Harada Haruyuki , Tanaka Mitsuru 
Published: July 2007

AbstractA study of a simple reconstruction algorithm for diffraction tomography based on the modified Newton‐Kantorovich method is presented. In situations where the Born approximation fails, the algorithm provides high‐quality reconstructed images without employing the usual regularization technique. Computer simulations demonstrate fast convergence properties of the iterative procedure.
Impact of local oscillator intensity noise on the performance of the optical phase‐diversity fsk receiver using delay‐and‐multiplying discriminator
Authors: Lee Yang‐Han , Kuo Ching‐Chih , Tsao Hen‐Wai 
Published: July 2007

AbstractThe impact of local oscillator intensity noise on the performance of an optical phase‐diversity FSK receiver using a delay‐and‐multiplying discriminator is analyzed. Given the data rate, frequency deviation, laser linewidth, RIN noise, and thermal noise, we can obtain the minimum received signal power together with the corresponding optimal local oscillator power to achieve the required BER. Numerical results with system parameters given in [1] show that (PL)opt is ‐1.46 dBm for RIN = ‐160 dB/Hz and ‐6.4 dBm for RIN = ‐150 dB/Hz when the thermal noise is 9 × 10−24 A2/Hz.
Radiation from dielectric waveguide step discontinuities—a bounded approach
Authors: Chen Tzong‐Jey , Chang Hung‐Chun 
Published: July 2007

AbstractThe bounded approach proposed by Brooke and Kharadly is a simple but accurate approximate method for analyzing the discontinuity problems of the open‐type planar dielectric waveguides; its usefulness in calculating the power properties has been illustrated [1, 2]. We find that the radiation patterns can also be obtained by using the bounded approach. The results present good agreement with those based on other rigorous approaches, in particular, around the mainbeam direction, which is usually the most important part to be determined.
Circularly polarized far fields of an axially magnetized circular ferrite microstrip antenna
Authors: Roy Jibendu Sekhar , Vaudon Patrick , Reineix Alain , Jecko FrançOise , Jecko Bernard 
Published: July 2007

AbstractThe theoretically derived far‐field components of a circular ferrite microstrip antenna (FMA), biased axially by a steady magnetic field, are reported in this letter. The circular polarization, obtained theoretically, is compared with the measured result.
Superstrate effect on the resonant frequency of microstrip antennas
Authors: Ramahi Omar M. , Lo Y. T. 
Published: July 2007

AbstractA computer code based on the full‐wave analysis and the spectral domain approach was developed to predict the effect of superstates on the resonant frequency of rectangular microstrip antennas. The formulation is based on the method of moments using Galerkin technique with entire‐domain basis functions. The resonant frequency is calculated by using an optimization routine that searches for the stationary condition of the characteristic equation. Numerical solutions are obtained for some test cases and are verified by comparison with experimental results.
On the mode spectrum of a parallel‐plate waveguide filled with a two‐layer uniaxial medium
Authors: Hsu Chung‐I G. , Harrington Roger F. , Michalski Krzysztof A. , Zheng Dalian 
Published: July 2007

AbstractA simple and reliable procedure is described for finding the complete spectrum of modes that may be excited in a parallel‐plate waveguide filled with a two‐layer uniaxial medium. © 1992 John Wiley & Sons, Inc.
On the reciprocity of bi‐isotropic media
Authors: Lindell Ismo V. 
Published: July 2007

AbstractIt is well known that the bi‐isotropic medium with four independent parameters is not reciprocal unless one of the parameters, the Tellegen parameter, vanishes. This property is not, however, easily seen from the Green dyadics and the subject has been under some controversy, because for electric or magnetic sources alone the medium appears reciprocal. In the present article it is demonstrated in terms of a simple example that for the nonzero Tellegen parameter the medium is truly nonreciprocal and the effect appears in the cross coupling of electric and magnetic sources. © 1992 John Wiley & Sons, Inc.
Angular spectral inversion for reconstruction of complex permittivity profiles
Authors: Lee Kyeong‐Soo , Ra Jung‐Woong 
Published: July 2007

AbstractFormulation in cylindrical coordinates for the reconstruction of the permittivity profiles using the moment method is presented. Angular spectral domain reconstruction is shown to be less sensitive to the ill‐posedness due to the noise in the scattered field than the configuration‐domain reconstruction. © 1992 John Wiley & Sons, Inc.
Finite‐element analysis of superconducting microstrip line for mmic applications
Authors: Kinowski D. , Pribetich P. , Kennis P. 
Published: July 2007

AbstractIn this Letter a new finite‐element formulation, which has been found to provide no spurious mode, has been applied to superconducting microstrip lines. Very good agreement is exhibited with the spectral domain approach, modified by the surface impedance concept, in the simple case of a rectangular‐shape superconducting strip. This makes it possible, in the future, to use this finite‐element formulation for any shape of strip and for anisotropic material. © 1992 John Wiley & Sons, Inc.
Performance of a wideband gaas low‐noise amplifier at cryogenic temperatures
Authors: Toncich S. S. , Bhasin K. B. , Chen T. K. , Claspy P. C. 
Published: July 2007

AbstractThe gain, noise figure, and 1‐dB compression point of a commercially available GaAs amplifier were measured at cryogenic temperatures. The gain and noise figure characteristics were improved by decreasing temperature, while the 1‐dB compression point remained unchanged. Repeated temperature cycling had no adverse effect on amplifier performance. © 1992 John Wiley & Sons, Inc.
A novel approach for designing GaAs FET frequency multipliers with optimum conversion gain and power efficiency
Authors: Lé D. L. , Ghannouchi F. M. , Bosisio R. G. 
Published: July 2007

AbstractThis article reports a new experimental design technique for GaAs FET frequency multipliers based on harmonic load‐pull measurements [1]. The choices of biasing point, input power level, and load impedances at the fundamental and harmonic frequencies are examined to optimize the conversion gain and the multiplier power efficiency. This technique was validated by designing a 2.5–7.5‐GHz frequency tripler, using the NE 71083 GaAs FET. The performance of the frequency tripler built in MIC technology was found comparable to the multiharmonic load‐pull results and simulation results. © 1992 John Wiley & Sons, Inc.
The design of an all‐optical spatial soliton switch in a lossy nonlinear medium
Authors: Bian Jieren , Chan Andrew K. 
Published: July 2007

AbstractThis design improves the authors' previous work by including losses in the nonlinear medium. Unlike other all‐optical switches, the nonlinear region for soliton interaction in this design is much shorter. This provides greater flexibility on the choices of nonlinear material as well as reduction of the threshold soliton power. The coupling between the signal and control beams is included in our numerical experiments. © 1992 John Wiley & Sons, Inc.
Full‐wave analysis of open microstrip transmission lines printed on anisotropic substrates with a protective layer
Authors: Chen Yinchao , Beker Benjamin 
Published: July 2007

AbstractThe dispersion characteristics of single and coupled open microstrip transmission lines, printed on anisotropic substrates with an added protective layer (superstrate), are reported in this article. The theoretical analysis is based on the rigorous formulation of the dyadic impedance Green's function in the spectral domain. The substrate materials are characterized by both their permittivity [ε] and permeability [μ] tensors, while the superstrate is assumed to be isotropic. The Galerkin procedure is applied to find the propagation constants numerically for different geometrical, substrate, and superstrate parameters of the covered guiding structure. © 1992 John Wiley & Sons, Inc.
Optical chip implementation of cellular automata
Authors: Lin Senmao , Kumazawa Itsuo , Wu Jie 
Published: July 2007

AbstractThe optical implementation of the elementary cellular automaton based on a two‐layer chip architecture is reported. All 256 cellular automaton local rules can be performed by programming the transparency of a SLM mask. Simulations and experimental results are also given. © 1992 John Wiley & Sons, Inc.