By Topic

Microwave and Optoelectronics Conference, 1995. Proceedings., 1995 SBMO/IEEE MTT-S International

Date 24-27 July 1995

Go

Filter Results

Displaying Results 1 - 25 of 79
  • A hybrid method solution of scattering by conducting cylinders (TM case)

    Publication Year: 1995, Page(s):881 - 887 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The finite element or finite difference techniques are well known for the solution of Maxwell's equation in the differential form. But terminating the mesh accurately at a finite distance from the body in the case of an open problem is a major challenge. The method of Sadiku (see Numerical Techniques in Electromagnetics, CRC Press, Inc., Boca Raton, 1992) is applied for only the electrostatic prob... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Author index

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (171 KB)
    Freely Available from IEEE
  • 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Proceedings

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (70 KB)
    Freely Available from IEEE
  • Quasi-static model for circular transmission lines

    Publication Year: 1995, Page(s):825 - 828 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Models have been developed for circular transitions of commonly used transmission lines, such as the stripline and the microstrip line, and have been included in commercial microwave CAD packages. Yet no general theory has been made for modeling the bends of other transmission lines, such as the coplanar waveguide. A model was derived for general circular transmission lines, based on a quasi-stati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optical power budget allocation in linear embedding and active delimitation electro-optic router network

    Publication Year: 1995, Page(s):641 - 646 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The design of an optical fiber network with linear embedding and active delimitation electro-optic router (LEADER), based on an array of optical amplifiers is presented. An analytical theory is used with prediction of the spontaneous noise power influence. The power budget allocation in the network can be calculated using the results. The longitudinal dependence of the photon population in the act... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The capacity of a CDMA wireless system

    Publication Year: 1995, Page(s):816 - 821 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Code division multiple access is a technique in which several users access a common medium, by modulating their symbols with designed spreading sequences. This article describes and analyzes a model for the discrete-input continuous-output Gaussian multiple access channel, that uses spread spectrum techniques. The relationship between the capacity of such system and the associated probability of e... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of normal mode helical antenna on finite ground plane

    Publication Year: 1995, Page(s):632 - 637 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The input impedance and the radiation pattern or normal mode helical antenna over a finite size ground plane are investigated. The problem is formulated in terms of the surface integral equation based on the piecewise-sinusoidal reaction concept. The current distribution along the helical wire as well as on the ground plane is determined using the method of moments View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Pro's and con's of TDMA and CDMA for digital cellular networks

    Publication Year: 1995, Page(s):810 - 815 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The main differences of today's TDMA (the GSM system family) and CDMA systems (the IS-95 CDMA) and their relative performance are shown. Technical features like frequency hopping, hand-off, hierarchical cell structures, power control, voice activity detection, equalization and RAKE reception are discussed. The speech coder is shown as the most essential part of a system in terms of quality and cap... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Active microstrip array for satellite communication applications

    Publication Year: 1995, Page(s):626 - 631 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    In this paper two microstrip arrays designed manufactured and tested for the needs of DBS signal reception in the X-band are presented. The TPA-256 antenna was a passive array and the TPA-256A antenna was an active one. TPA-256 and TPA-256A differed in their beamforming networks (BFN)-BFN of the TPA-256A array contained two microwave low noise amplifiers (LNA) to increase antenna sensitivity. The ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Trends in mobile communication

    Publication Year: 1995, Page(s):803 - 809 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Some current developments of digital mobile systems are discussed including new coding techniques, channel modelling and simulation programs. Progress in high GHz-techniques and smart hardware development is illustrated. International exposure limits for biological interaction are summarized View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Statistical estimation of the complex reflection coefficient of microwave loads using a multiport reflectometer

    Publication Year: 1995, Page(s):685 - 689 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A new universal technique of microwave network complex reflection coefficient measurement based on the solution of the (N+2)-port equations by the maximum likelihood method is proposed. The expressions for the measurement errors are obtained in a linear approximation. It is shown that the measurement accuracy grows with the increase in the number of measurement ports View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of band-limited functions to the analysis of axially symmetric reflectors

    Publication Year: 1995, Page(s):620 - 625 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A band-limited set of basis functions is employed, in a 3-D situation, to reduce the spatial-sample count associated with the method of moments (MoM) procedure. Results obtained from modelling axially symmetric reflectors, using variable spatial sample counts, are compared with ones derived from other classes of basis functions. The comparison evidences a superior computational performance (CPU ti... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The horizontal structure of rain and its impact on the design of advanced satellite systems at centimetre and millimetre wavelengths

    Publication Year: 1995, Page(s):519 - 525 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    The paper deals with the severe propagation problems that will be probably encountered in designing the future satellite communication systems in the Ka band and above and with some possible advanced solutions based on the knowledge of the local climatology. Within the very wide spectrum of new envisaged systems two particularly significant examples have been selected: the TV-sat at 22 GHz and the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Diffractive structures in integrated optics

    Publication Year: 1995, Page(s):795 - 799 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Integrated optical diffractive structures can be profitably used in a variety of applications. Grating couplers, for example, are suitable for waveguide characterization, while more complex components, such as Fresnel lenses, can constitute the focusing elements of most IO signal processing devices. We consider both practical and design aspects of the realization of several waveguide diffractive s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bias unit for microwave and high speed fiber optic systems

    Publication Year: 1995, Page(s):681 - 684 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Optoelectronic component interconnections are essential for high data transfer performance in gigabit per second systems and ultrashort pulse applications. Bias “T” units have found extensive use as DC supplies for lasers and photodiodes. However, commercially available units for microwave components operation have not only large dimensions but also very high prices. The very high spee... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Heterojunction bipolar transistors under illumination: theory and experiment

    Publication Year: 1995, Page(s):920 - 925 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A new model for the HBT has been developed which solves for the electrical and photogenerated currents in the base, emitter, and collector. The model accounts for the discontinuity in the quasi-fermi level by defining an effective carrier interface velocity. Experimental and theoretical curves relating to the device behavior are presented and compared View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Wide flare angle Ku band axially corrugated horn for offset VSAT antennas

    Publication Year: 1995, Page(s):615 - 619 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    A wide semi-flare angle linearly tapered corrugated horn, with eight axial slots, has been developed for use in single offset antennas for VSAT earth stations with low cross-polarization peak levels from 10.7 GHz to 14.8 GHz. Mode-matching techniques have been successfully applied to the horn return loss and radiation pattern prediction and the critical effects of the ridges and output flange thic... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A spectral domain method for multiple scattering in transition layer of two-scale random surface

    Publication Year: 1995, Page(s):901 - 905 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The spectral domain method is extended to a wavefield propagating in the transition layer of a two-scale random surface. The integral equations set for the two-dimensional Fourier spectra of the wavefield by scattering from the random surface is obtained: the shadow and multiple scattering effects are taken into account in the approach. The solution of this set can be computed by a number of itera... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comparative performance of the reduced integration penalty approach for removing spurious FE solutions of dielectric waveguides

    Publication Year: 1995, Page(s):511 - 515 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The reduced integration penalty method and the use of vector interpolation are two basically different new approaches for eliminating spurious finite element solutions of dielectric waveguides. Their computational performances are compared in terms of the convergence of the eigenvalues considering the mesh densities, computation times and storage demands, and highlighting their significant feature... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The applications of photonics to radar: a system designer's perspective

    Publication Year: 1995, Page(s):717 - 724 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A generic active array radar system is defined, and a brief functional description of the subsystems presented. For comparison, two contemporary conceptual views of optically controlled arrays are discussed, and the transition to a more realistic architecture model is described. Several proposed photonic antenna systems from the current literature are critiqued with respect to the model View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Efficient coupling of a graded index glass guide to a polymer guide by means of a tapered transition

    Publication Year: 1995, Page(s):789 - 794 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A new four layer tapered coupler (FLTC) has been studied and tested, able to transfer light efficiently from a monomode fiber to a polymer film guide by means of an auxiliary graded index glass waveguide. A simple theory has been developed to calculate the maximum efficiency of these structures. Experiments have been performed at λ=1.321 μm on several FLTC samples, containing K... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The six-port reflectometer: choosing a calibration method

    Publication Year: 1995, Page(s):675 - 680 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    This paper presents a discussion on four known and frequently employed six-port reflectometer calibration procedures, namely the ones by Glenn Engen (1978), Ghannouchi et al. (1988), Sunil Judah (1985) and Cong-Zhen Qian (1985). The desired features usually sought in a calibration method, like accuracy, ease of calibration and low cost, among others, are discussed for each method above. The proced... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Distortion in a semiconductor laser under quasi-sinusoidal current modulation

    Publication Year: 1995, Page(s):932 - 935 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    Both intensity modulation (IM) and frequency modulation (FM) of a directly-modulated semiconductor laser are considered. Harmonic and intermodulation distortions are evaluated with the aid of a nonlinear differential equation for the photon density. Theoretical results are obtained through the Bessel function and the perturbation methods. They allow one to compare FM and IM distortion levels, as w... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Delayed self homodyne measurements of AM and FM response of modulated multisection diode lasers

    Publication Year: 1995, Page(s):914 - 919 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The delayed self homodyne technique was applied to the measurement of the FM response of modulated multisection lasers over a wide frequency range. The AM was observed simultaneously to the FM measurements. A theoretical description of the power spectra measured by the delayed self homodyne is presented. The experimental results using a three section DFB laser are in good agreement with the theore... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spacecraft antennas-a EUTELSAT perspective

    Publication Year: 1995, Page(s):607 - 614 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    The paper reviews the development of linear polarized Ku-band spacecraft antenna technology as seen on the EUTELSAT I and II series of telecommunication satellites and the EUTELSAT Hot Bird series of television broadcast satellites. Some aspects of the design of spacecraft antenna coverages for EUTELSATs are reviewed as well as possible directions for future development of telecommunication spacec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.