bluuebunny/crossref_metadata_2025_split huggingface dataset:
Input impedance of a slot‐coupled circular microstrip antenna
Authors: Huang Chih‐Yu , Wong Kin‐Lu 
Published: July 2007

AbstractAnalysis of a slot‐coupled circular microstrip antenna using a generalized transmission‐line model theory is presented. An equivalent circuit for the antenna can be derived based on this theoretical approach, and the input impedance of the antenna can be readily calculated. Theoretical results for various slot lengths are presented and also compared with the measured data. © 1995 John Wiley & Sons, Inc.
A referencing system for optical fiber sensors
Authors: Muhammad F. A. , Jin W. , Al‐Raweshidy H. S. , Senior J. M. 
Published: July 2007

AbstractA novel polarimetric referencing scheme is proposed in order to correct measurements in a D‐fiber methane gas sensor. The technique makes use of the polarization‐maintaining property of the D‐fiber. Theoretical analysis of the scheme is carried out using a semivectorial polarized finite‐difference method. Results show that the referencing technique can be applied to a wide range of both aqueous and gaseous species, as it does not depend on the absorption coefficient of the absorber, but only on the birefringence properties of the waveguide. © 1995 John Wiley & Sons, Inc.
Accurate extraction of dual‐gate field‐effect‐transistor parasitic elements
Authors: Langrez D. , Delos E. , Salmer G. 
Published: July 2007

AbstractThis article describes an accurate method for the extraction of dual‐gate field‐effect‐transistor (FET) parasitic elements. Parallel and series elements are separately determined in two different steps under the cold regime (Vds = 0 V). The effect of parasitic capacitances on Zij parameters is taken into account when extracting parasitic inductances. Some experimental results about 0.15‐μ dual‐ and single‐gate PM‐HEMTs are given. © 1995 John Wiley & Sons, Inc.
Experimental validation of PO/UTD applied to fresnel‐zone plate antennas
Authors: Sluijter J. , Herben M. H. A. J. , Vullers O. J. G. 
Published: July 2007

AbstractThe electromagnetic modeling of the Fresnel‐zone plate antenna (FZPA) by means of physical optics (PO) and the uniform theory of diffraction (UTD) is experimentally verified. Near‐field measurements on basic configurations of the FZPA (i.e., a slit and two rings in a metallic plate) at 50 GHz and far‐field measurements on a complete FZPA at 11.5 GHz show good correspondence with computer simulations based on UTD and PO. © 1995 John Wiley & Sons, Inc.
Scattering from axially slotted cylinders: A finite‐element approach
Authors: Pelosi G. , Coccioli R. , Manara G. , Monorchio A. 
Published: July 2007

AbstractA numerical technique is presented that makes use of the finite‐element method for the analysis of the scattering from perfectly conducting cylinders with cavity‐backed apertures. The method of solution, based on an application of the equivalence principle, is very flexible and can be easily extended to analyze cases in which the cylinder is inserted into a complex environment. © 1995 John Wiley & Sons, Inc.
A new nonlinear dc model for HBT and mesfet power devices
Authors: Hajji Rached , Kouki Ammar B. , Ghannouchi Fadhel M. 
Published: July 2007

AbstractA new nonlinear empirical model that can be applied to the collector current source of power HBT devices and to the drain current source of power MESFETs is presented. The model includes the self‐heating effects present in both HBT and MESFET devices. It also accurately predicts the slope variation of the dc‐I‐V characteristics from positive to negative, which occurs in MESFET devices. The proposed model is validated with the measured dc and small‐signal characteristics of one HBT and one MESFET medium‐power device. Good agreement between measurement and simulation results was obtained for both devices. © 1995 John Wiley & Sons, Inc.
Bistatic scattering width computation for nonlinear isotropic infinite multilayer circular cylinders
Authors: Caorsi Salvatore , Massa Andrea , Pastorino Massa 
Published: July 2007

AbstractAn iterative approach to the approximate computation of the bistatic scattering width (BSW) for nonlinear multilayer concentric circular cylinders is proposed. The nonlinear layers are assumed to exhibit a Kerr‐like nonlinearity. The approach is based on the distorted‐wave Born approximation, and the initial linear solution is obtained by using the recursive Richmond formulas. A TM illumination is considered. Numerical results are reported, concerning weakly nonlinear shells and concentric cylinders coated with nonlinear layers, or presenting nonlinear dielectric nuclei. © 1995 John Wiley & Sons, Inc.
A new method for calculating electromagnetic scattering of complex objects
Authors: Liao Cheng , Zhao Yu‐Shen , Lin Wei‐Gan 
Published: July 2007

AbstractThe method of differential‐Thompson transformation (DTTR) is applied for the first time to the field of electromagnetic scattering. Complex objects and their computational areas are transformed by DTTR to a regular area. By applying the finite‐difference‐Time‐Domain (FDTD) technique, the field distribution is solved conveniently. Numerical examples show good comparison with exact results. © 1995 John Wiley & Sons, Inc.
Optical tuning behavior of Al0.25 Ga0.75 As/GaAs HBT oscillators with transparent ITO emitter contacts
Authors: Freeman P. N. , Karaküçük M. , Bhattacharya P. K. 
Published: July 2007

AbstractOptical tuning experiments were performed on an Al0.25Ga0.75As/GaAs HBT oscillator operating at 6 GHz. The HBT was fabricated with a transparent emitter ohmic contact made of indium‐tin‐oxide (ITO) to allow light input through the top of the device. Under direct illumination of the base and base‐collector depletion regions, optical tuning was observed with an increase in oscillation frequency of up to 25 MHz. The observed increase in frequency is attributed to a shift in resonance due to a decrease in the base‐emitter junction capacitance of the HBT under optical illumination. This effect is verified using detailed device and circuit modeling techniques. © 1995 John Wiley & Sons, Inc.
2.5D EM small‐signal analysis of mesfets and hemts taking into account the full device metallization geometry
Authors: John A. , Jansen R. H. 
Published: July 2007

AbstractThe full‐wave electromagnetic (EM) spectral‐domain approach so far applied to predominantly planar (2.5D) passive MIC / MMIC structures has been extended to the rigorous EM treatment of active devices like MESFETs/HEMTs incorporating the full metallization geometry. The presented approach is verified with a 1 × 300‐μm GaAs MESFET application example. © 1995 John Wiley & Sons, Inc.
A 3 × 3 quasioptical power combining array using FET active notch antennas
Authors: Leverich W. Kent , Wu Xiao‐Dong , Chang Kai 
Published: July 2007

AbstractActive antenna elements consisting of FET oscillators integrated with notch antennas have been used to create a 3 × 3 quasioptical power combining array. The array has a good power combining efficiency and a well‐defined main beam. The design of the FET active notch antenna element and the performance of the 3 × 3 array are discussed. © 1995 John Wiley & Sons, Inc.
Time‐domain beltrami‐maxwell solitons in certain nonlinear chiral media
Authors: Bass F. G. , Slepyan G. Ya. , Maksimenko S. A. , Lakhtakia A. 
Published: July 2007

AbstractTime‐dependent Beltrami fields are used as the basis of a novel phenomenological theory of the self‐action of electromagnetic pulses in certain nonlinear, isotropic chiral media. A set of coupled nonlinear Schrödinger equations for slow space‐time amplitudes is obtained. The specific features of some soliton solutions in the chosen chiral medium are described and qualitatively compared with those of soliton solutions in nonlinear, anisotropic, achiral dielectric media. © 1995 John Wiley & Sons, Inc.
Proposal of a novel interferometric fiber‐optic gyroscope
Authors: Shi Chao‐Xiang , Yuhara Toshiya , Lizuka Hisao , Kajioka Hiroshi 
Published: July 2007

AbstractA novel interferometric fiber‐optic gyroscope with amplified optical feedback by an Er‐doped fiber amplifier (EDFA) is proposed and theoretically investigated (the proposed gyro is called FE‐FOG). FE‐FOG functions like an R‐FOG (resonant fiber‐optic gyro) due to its multiple utilization of the Sagnac loop; however, it is completely different, because a low‐coherence light source is used. In addition, the gyro output signal is pulsed, because the modulation frequency of the phase modulator placed in the Sagnac loop is selected to match the round‐trip time delay of the light. When the rotation occurs the peak position of output pulse is shifted due to the Sagnac effect. The resolution of rotation measurement depends on the sharpness of the output pulse. Both open‐loop and closed‐loop methods are described in detail. © 1995 John Wiley & Sons, Inc.
Performance predictions for GaAs franz‐keldysh effect optical reflection modulators based on measured absorption data
Authors: Leeson M. S. 
Published: July 2007

AbstractPerformance predictions for a simple reflection modulator based on measured absorption data are presented, and then resonant enhancement is described. Calculated and measured performance for a resonant transmission device is presented with excellent agreement. An optimized resonant reflection modulator is designed giving 17‐dB contrast for 2.1‐dB insertion loss at — 30‐V bias. © 1995 John Wiley & Sons, Inc.
Analytical formulas for calculating the effective dielectric constants of coplanar lines for OIC applications
Authors: Zhu Ning Hua , Pun Edwin Yue Bun , Li Jia Xu 
Published: July 2007

AbstractWe use conformal mapping techniques to derive the quasianalytical formulas for calculating the effective dielectric constants of coplunar lines on LiNbO3 substrates having a buffer layer. Our calculations agree well with the results obtained using the point‐matching method. © 1995 John Wiley & Sons, Inc.
A12‐GHZ high‐temperature superconducting semiconductor oscillator
Authors: Chauvel D. , Crosnier Y. , Carru J. C. , Chambonnet D. , Belouet C. 
Published: July 2007

AbstractIn view of a monolithic integration of high‐temperature superconducting (HTS) passive circuits and semiconductor (SC) active devices, we propose in this work a hybrid SC / HTS microstrip oscillator operating at 77 K and 12 GHz, combining a HEMT and a YBaCuO ring resonator. © 1995 John Wiley & Sons, Inc.
Simplified method for an active transverse dipole array design
Authors: Floc'h J. M. , Desclos L. 
Published: July 2007

AbstractThe basic topology is a series of transverse dipoles coupled electromagnetically to a microstrip line. After modeling each element with a numerical technique (MoM), this array is modeled with an equivalent circuit in CAD software. This method is shown to be reliable and can interface easily with commercially available software, which allows global simulation and optimizes the design. This versatility is demonstrated with a realization example: A six‐dipole active array at 10 GHz showing a 27.5‐dBi gain. © 1995 John Wiley & Sons, Inc.
Characterization of cylindrical microstrip gap discontinuities
Authors: Chen Hua‐Ming , Wong Kin‐Lu 
Published: July 2007

AbstractA rigorous full‐wave analysis of microstrip gap discontinuities on cylindrical surfaces is presented. Numerical results for the frequency‐dependent reflection and transmission coefficients and the gap capacitance and conductance are calculated using a moment‐method calculation, in which a combination of entire‐domain sinusoidal and piecewise sinusoidal basis functions is used to represent the currents on the microstrip line. The characteristics of cylindrical microstrip gap discontinuities for various curvatures and gap spacings are analyzed. © 1995 John Wiley & Sons, Inc.
Sensitivity comparison of MSM‐HBT and p‐i‐n — HBT OEIC receivers
Authors: Liu Qing Z. 
Published: July 2007

AbstractThe sensitivity of heterojunction‐bipolar‐transistor‐ (HBT‐) based OEIC receivers with metal‐semiconductor metal photodetectors (MSM‐PD) or p‐i‐n photodetectors (p‐i‐n‐PD) are compared. With an accurate small‐signal circuit model of an InP/InGaAs HBT, it is shown that sensitivity of the p‐i‐n‐HBT receiver is higher than that of the MSM‐HBT receiver even though the high‐frequency equivalent input noise current density is higher for the former than the latter. However, the HBT receiver using MSM‐PD with light transparent conducting fingers would offer a potential sensitivity improvement of 0.5 dB over the p‐i‐n‐HBT receiver at 10 Gbit/s due to an increased responsivity of the MSM‐PD. © 1995 John Wiley & Sons, Inc.
General field theory treatment of a quasioptical faraday rotator
Authors: Dou W. B. , Sun Z. L. 
Published: July 2007

AbstractGeneral field theory treatment of quasioptical Faraday rotator for use as either an isolator or circulator is presented. The use of matrix methods in conjunction with Fourier‐transformation techniques greatly facilitates the formation of the boundary‐value problem, and provides a closed‐form representation of the electromagnetic field over the anisotropic region. Numerical results are presented and compared with those in Reference [2], and they agree with experiments. © 1995 John Wiley & Sons, Inc.
Physical optics applied to discs and square plates in near field leads to a simple formula
Authors: Desclos L. , Pouliguen P. 
Published: July 2007

AbstractIn this article the analytical solution of physical optics in near field for a perfectly conducting disc or square plane surface is discussed. This discussion leads to very simple formulations giving the values and positions of the minima and the maxima of the radar cross section (RCS) with simple laws © 1995 John Wiley & Sons, Inc.
Experimental and theoretical analysis of planar applicators for microwave hyperthermia at 434 MHz
Authors: Michel C. , Dubois L. , Cresson P. Y. , Chive M. , Pribetich J. 
Published: July 2007

AbstractWe propose to show that the use of applicators designed for 915 MHz is possible at 434 MHz provided that a high‐permittivity dielectric layer is laid on the microstrip excitation line. In this case, the heated area is practically the same, but we obtain a better focusing of the hot zone inside the heated tissues. © 1995 John Wiley & Sons, Inc.
Mutual coupling computation of cylindrical‐rectangular microstrip antennas using cavity‐model theory
Authors: Chen Jin‐Sen , Wong Kin‐Lu 
Published: July 2007

AbstractThe cavity‐model solutions for mutual coupling between two probe‐fed cylindrical‐rectangular microstrip antennas are presented. Typical numerical results of the mutual impedance and the mutual coupling coefficient for different curvature radii are shown. Results are found to be in good agreement with the full‐wave solutions. © 1995 John Wiley & Sons, Inc.
Matrix thinning with reduced‐field testing (RFT)
Authors: Kastner Raphael , Nocham Gabriela 
Published: July 2007

AbstractThe reduced‐field testing (RFT) method, presented here, is based on the distinction between near‐field and far‐field interactions in the spatial domain, generating a single, explicit sparse matrix. Basis functions are chosen independently; thus the method can enhance existing codes and be combined with other efficient techniques. © 1995 John Wiley & Sons, Inc.
Multifrequency microwave imaging of a lossy dielectric cylinder in a lossy medium
Authors: Kim Jung‐Hye , Ra Jung‐Woong 
Published: July 2007

AbstractMultifrequency Born inversion of the dielectric object is modified to include the lossy dielectric in a slightly lossy background medium. Two typical numerical examples of a circular and an L‐shaped lossy dielectric cylinder are presented with their ranges of validity. By using the improved Born inversion, a permittivity contrast of 1–6 may be reconstructed, but the range of conductivity is rather limited. © 1995 John Wiley & Sons, Inc.
Curvature effect on the mutual coupling of circular microstrip antennas
Authors: Chen Jin‐Sen , Wong Kin‐Lu 
Published: July 2007

AbstractThe mutual coupling between cylindrical‐circular microstrip antennas is studied by applying the cavity‐model analysis and the reaction theorem. Expressions of the mutual coupling coefficients for the E‐plane and H‐plane coupling casés are presented. Theoretical results are calculated, and the curvature effects on the mutual coupling are discussed. © 1995 John Wiley & Sons, Inc.
Broadband twin‐junction tuning circuit for submillimeter SIS mixers
Authors: Belitsky V. Yu. , Jacobsson S. W. , Filippenko L. V. , Kollberg E. L. 
Published: July 2007

AbstractA 400–550‐GHz fixed tuned quasioptical Nb/AlOx/Nb SIS heterodyne receiver has been built, and its performance has been evaluated. The receiver, operated at 3.5 K, showed noise temperatures ≤ 300‐K DSB within the tuning range of the available LO source (440–520 GHz). The SIS junction capacitance was tuned out by a novel twin‐junction circuit, which offered 130‐GHz fixed tuned bandwidth at 480 GHz. Large‐area SIS junctions (3.5 μm2, ωRnC ≈︁ 7.5 at 500 GHz), patterned by optical lithography, were used. © 1995 John Wiley & Sons, Inc.
Wavelength‐multiplexed photonic beam‐former architecture for microwave phased arrays
Authors: Minasian R. A. , Alameh K. E. , Fourikis N. 
Published: July 2007

AbstractA novel architecture is presented for beam formers in multiple‐beam active phased arrays operating over one or more octaves in frequency. The photonics‐based beam former is suitable for large‐scale arrays with multiple simultaneous and independent antenna beams, and substantially reduces the number of required interconnects between antennas and beam ports, when compared to conventional beam‐forming architectures. We show that a significant reduction of 96.5% in the required number of delay lines for a 512‐beam array is possible, through the use of a new wavelength division multiplexing (WDM) delay unit in the novel architecture. © 1995 John Wiley & Sons, Inc.
Fast iterative algorithm for the fine detail analysis of planar scatterers
Authors: Finkelstein Bezalel , Kastner Raphael 
Published: July 2007

AbstractA very efficient iterative algorithm is presented for the analysis of planar scatterers at the very fine detail regime. The mechanisms causing slow convergence in other techniques have been identified and corrected. The resultant algorithm converges very fast for problems with fine details sampled faster than 0.001°, where other methods fail. © 1995 John Wiley & Sons, Inc.
Some aspects of electron‐optical system numerical synthesis
Authors: Yurchenko Lidiya V. 
Published: July 2007

AbstractThe possibilities and the conditions for the creation of laminar axial electron beams with any desired electrical and geometrical characteristics have been investigated. The problem of synthesis has been formulated in a general way. A number of numerical results for different physical situations has been obtained. The principal possibility of arbitrary dense laminar electron beams forming has been shown. © 1995 John Wiley & Sons, Inc.
Optical compact crossbar and an HIPPI interconnection system
Authors: Wang Ning , Liang Feng , Yin Yaozuo , Liu Liren 
Published: July 2007

AbstractA compact packaging optical crossbar network is proposed in the article. It is based on a polarization multiplex technique. This compact packaging crossbar network is easy to assemble and insensitive to environmental disturbance. We also construct an optical HIPPI interconnection system. © 1995 John Wiley & Sons, Inc.
Whispering‐gallery modes of nonuniform dielectric resonators
Authors: Filipov Yuri , Kharkovsky Sergey , Kirichenko Alexsandr 
Published: July 2007

AbstractNew results of theoretical and experimental investigations of nonuniform dielectric resonators (DRs) with higher‐order azimuthal waves (whispering‐gallery modes) are presented. The frequency splitting and modal coupling phenomena are studied. The effect of the space‐frequency field separation of the modes is found. Application of nonuniform dielectric resonators for the study of various materials (semiconductive and dielectric plates and films, high‐Tc superconductors), and for the design of millimeter‐wave filters and oscillators is proposed. © 1995 John Wiley & Sons, Inc.
Design of wave absorbers for cylindrical objects for both horizontal and vertical polarizations
Authors: Hashimoto Osamu , Motoyoshi Souichiro , Mittra Raj 
Published: July 2007

AbstractThis article discusses the design of wave absorbers for cylindrical objects with a view to reducing their radar cross sections (RCSs). The case of a two‐layer absorber is presented, and it is shown that, with appropriate design, the coating can help reduce, simultaneously, the scattering from the cylinder for both polarizations. © 1995 John Wiley & Sons, Inc.
FDTD analysis of permittivity measurement with rectangular cavity resonators
Authors: Abe Takumi , Hashimoto Osamu , Mittra Raj 
Published: July 2007

AbstractIn this article we describe an application of the finite‐difference‐time‐domain (FDTD) method to the problems of the cavity resonator measurement of material permittivity and a quantitative estimation of errors in such measurements via the use of perturbation methods. It is shown in this article that the error in the permittivity estimation increases with an increase of the size of dielectric material and that it has a positive correlation with the material permittivity. © 1995 John Wiley & Sons, Inc.
Bistability of a complex‐coupled DFB laser with TM‐mode injection
Authors: Shi Chao‐Xiang 
Published: July 2007

AbstractWe propose a novel method to produce optical bistability by using a complex‐coupled DFB (CC‐DFB) laser with TM‐mode injection. Because the CC‐DFB laser has good, dynamically stable operation, our proposed method is advantageous in high‐speed switching for signal processing. Polarization optical bistabilities are detailed using coupled‐mode equations and rate equations for the CC‐DFB lasers considering longitudinal hole burning and carrier‐dependent complex‐coupling coefficients. Many parameters reflecting the physical features of a complex‐coupled DFB laser are discussed. It is shown that for a CC‐DFB laser the polarization bistability induced by TM‐mode injection is much stronger for the antiphase of complex coupling than for the in phase. For the antiphase case the bistability becomes stronger if the complex‐coupled DFB laser structure is close to a pure gain grating DFB laser. © 1995 John Wiley & Sons, Inc.
Stubbed right‐angle H‐plane waveguide bend
Authors: Lee Jae W. , Eom Hyo J. , Lee Jung H. , Yoshitomi Kuniaki 
Published: July 2007

AbstractA stubbed right‐angle H‐plane waveguide bend is proposed and its solution is obtained in analytic series form. The Fourier sine transform is used in the spectral domain to obtain the transmission and reflection coefficients in fast convergent series forms. The stubbed right‐angle H‐plane waveguide bend is shown to have better transmission characteristics (wider bandwidth) than the conventional bend without a stub. © 1995 John Wiley & Sons, Inc.
Bandwidth enhancement of a metal‐semiconductor‐metal photodetector array
Authors: Liu Qing Z. 
Published: July 2007

AbstractAnalyses and detailed simulations of the bandwidth performance of a metal‐semiconductor‐metal photodetector (MSM‐PD) array were carried out. Based on a simple model of an array with two MSM‐PDs, analytical expressions were derived to calculate the transfer function of the array, from which the 3‐dB bandwidth of the MSM‐PD is determined. The extrinsic responses of the 1 × 8 MSM‐PD array were examined by introducing packaging elements. It is shown that the use of bonding wires with appropriate length results in an improvement of the 3‐dB bandwidth compared to that of the intrinsic MSM‐PD array. © 1995 John Wiley & Sons, Inc.