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Microwave Conference, 1980. 10th European

Date 8-12 Sept. 1980

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Displaying Results 1 - 25 of 137
  • Contents

    Publication Year: 1980, Page(s):nil1 - nil28
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    Freely Available from IEEE
  • Optical Communications Versus Microwave Transmission Systems

    Publication Year: 1980, Page(s):2 - 8
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  • Gigabit Electronics - Present State and Trends

    Publication Year: 1980, Page(s):9 - 18
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    Application fields for Gb/s electronics, with high-throughput signal processing as the prime motive, are indicated. Recent implementations of Gb/s ICs are mentioned. After describing and commenting on the multitude of silicon and GaAs approaches, a projection on their ultimate functional throughput rate (FTR) is attempted, based on present experimental data. In a similar way, the possibilities of ... View full abstract»

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  • New Semiconductor Materials for Microwave Applications

    Publication Year: 1980, Page(s):19 - 24
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  • MIC Wave-Guiding Structures Filled with Anisotropic Media

    Publication Year: 1980, Page(s):25 - 36
    Cited by:  Papers (1)
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    There are considered generalized multiconductor lines with many anisotropic layers which cover a broad range of practically importent microwave guides suitable for present and future applications in MIC technology. After a short review and evaluation of existing analyses enabling to study such lines a new and efficient analysis method is developed and implemented. As an example a thorough and deta... View full abstract»

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  • Low Noise mm-Wave Receivers

    Publication Year: 1980, Page(s):38 - 47
    Cited by:  Papers (4)
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    In this review paper coherent low noise receivers for frequencies from about 20 GHz up to a few hundred GHz are discussed. Mixers using Schottky barrier diodes, the working horses in mm-wave receivers, are described in some detail. The noise sources are identified and methods to minimize the noise of room temperature and cooled single ended mixers, as well as subharmonically pumped mixers, are rel... View full abstract»

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  • Microwave Aquametry

    Publication Year: 1980, Page(s):48 - 58
    Cited by:  Papers (4)
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    Same problems connected with application of microwave techniques for moisture content measurement in solid and liquid materials have been presented. It has been shown that in many cases microwaves are superior to other methods because of the specific microwave properties of materials and the possibility of contactless, remote probing. Present state of the art in microwave instrumentation as well a... View full abstract»

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  • Fast Calculation of Far-Field Patterns of Reflector Antennas with Fast Fourier Transform

    Publication Year: 1980, Page(s):61 - 66
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    The development of a numerical technique for the fast calculation of farfield radiation patterns of reflector antennas is reported. The technique applies to antennas subjected to a small angle approximation, with no restrictions as to the reflector shape and as to the feed location. Considerable acceleration of calculations is achieved through the utilization of a two-dimensional FFT algorithm ass... View full abstract»

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  • Numerical Evaluation of Antennas Field using a New Aperture-Like Expansion

    Publication Year: 1980, Page(s):67 - 71
    Cited by:  Papers (1)
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    This paper deals with a new aperture-like expansion of the field scattered by a reflector antenna, which allows to reconstruct the field radiated by such an antenna starting from a limited number of computed values, essentially one per lobe. This values, in turn, are exact Fourier transforms evaluated at the Nyquist rate, which allows an optimal use of the Fast Fourier Transform algorithm. An exte... View full abstract»

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  • A Complete GTD Analysis of RIM Loaded Cassegrain Antennas

    Publication Year: 1980, Page(s):72 - 77
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    A complete numerical analysis of the radiation pattern of centered symmretric Casse grain antennas is carried out. The peripherical rims of both the reflector and the subreflector are assumed to be loaded by material media described in terms of surface impedances. The Geometrical Theory of Diffraction (GTD), properly generalized to handle surface impedance boundary conditions, is used to compute t... View full abstract»

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  • Calculation of the Radiation Patterns of Axially Symmetric Reflectors

    Publication Year: 1980, Page(s):78 - 83
    Cited by:  Papers (2)
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    Scattered fields from axially symmetric reflectors (paraboloid, ellipsoid, hyperboloid, spheroid and plane) are calculated by high-frequency asymptotic techniques. For this purpose, the scattered fields from an axially symmetric reflector are expressed in terms of the reflector eccentricity. By using appropriate eccentricity values, the scattered fields from a reflector of any eccentricity can be ... View full abstract»

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  • Complete Theoretical Pattern of a Cassegrain Antenna with Experimental Check of Validity

    Publication Year: 1980, Page(s):85 - 89
    Cited by:  Papers (1)
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  • The Application of Single Reflector Multi-Feed Antennas to Direct T.V. Satellites

    Publication Year: 1980, Page(s):90 - 94
    Cited by:  Papers (1)
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    The antenna technique associating a single offset-fed reflector cut out from a revolution paraboloid to a multi-element feed source is being widely used for telecommunication satellites. This paper shows over the example of the French coverage area that the antenna technique is also an excellent solution for direct T.V. Broadcast satellites because of these decisive features : - large flexibility ... View full abstract»

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  • A European Contoured Beam Reflector Antenna Development

    Publication Year: 1980, Page(s):95 - 99
    Cited by:  Papers (2)
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    This communication provides the present results of an ongoing development, sponsored by the European Space Agency, of design software and of a feasibility model for a contoured beam reflector antenna (COBRA), to cover Europe from a geostationary satellite. The design software, feed array elements and feed network components are described. Present computed and experimental results are given. New re... View full abstract»

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  • Corrugated Horn of HE11 and HE21 Mode

    Publication Year: 1980, Page(s):100 - 103
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    A corrugated conical horn for monopulse feed, which uses the HE11 mode as sum. one and the HE21 as difference one, is described in this paper. When the ratio for the radius of the hor aperture and the free space wavelength is very large, the balanced hybrid condition can be met for both HE11 and RE21 modes. Therefore, the horn has rotational symmetry beams and low side-lobe levels for both sum. an... View full abstract»

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  • Experimental Analysis of Corrugated Conical Horns with very Wide Flare Angles

    Publication Year: 1980, Page(s):104 - 108
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    It is well known the difficulty of predicting theoretically the radiation properties of a corrugated conical horn with very wide flare angle (2¿ ¿ 180°). So a detailed experimental analysis on these antenna feeders has been carried out as function of the geometrical parameters and of the frequency. The results are summarized in graphics and analytical expressions in order to predict the radiati... View full abstract»

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  • Ring-Shaped Dielectric Antenna

    Publication Year: 1980, Page(s):109 - 113
    Cited by:  Papers (7)
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    This paper describes some results of an extensive theoretical and experimental work on a novel type of antenna design-a ring-shaped dielectric antenna. It consists of two basic elements:a dielectric ring and a primary feed. One possible construction of a such antenna has a ring with rectangular cross-section and a waveguide-dielectric radiator serves as a primary source. The optimum dielectric rin... View full abstract»

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  • Current Distribution in Microstrip Planar Antennas

    Publication Year: 1980, Page(s):117 - 121
    Cited by:  Papers (3)
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    The accurate determination of surface currents in microstrip planar antennas requires the solution of a two-dimensional singular integral equation. The first problem encountered when solving this equation numerically, is the obtention of a fast and accurate algorithm for evaluating its kernel, which cannot be calculated by standard computer integration methods. A second problem is the implementati... View full abstract»

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  • Design Considerations in Microstrip Antenna Fabrication

    Publication Year: 1980, Page(s):122 - 126
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    Deviations in effective electrical dimensions caused by slight variations in finished microstrip antenna length, variations in the relative permittivity of the substrate material or nonuniformity in the substrate thickness lead to discrepancies between the designed and actual resonant frequencies. This sort of discrepancy is especially significant because of the narrow bandwidth of such antennas. ... View full abstract»

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  • Approximate Coupling Formulas for the Coupling Between Microstrip Resonator Antennas

    Publication Year: 1980, Page(s):127 - 131
    Cited by:  Papers (2)
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    Generally the best-known methods for computing mutual impedances are based on a direct integration of the ¿ and H¿ fields, as given in Jordan [1]. Other methods involve approximations valid for large, in theory infinite arrays, reducing any integration in the spectral domain to mere summations [2]. Some derivations have been made by array specialists coming to the solution for identical slots in... View full abstract»

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  • Radiation from a Gap Cut Across the Conducting Strip of a Double Shorted Microstrip Resonator

    Publication Year: 1980, Page(s):132 - 136
    Cited by:  Papers (1)
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    A double shorted linear microstrip resonator symmetrically loaded with a gap is used to investigate the radiation from the gap. Gap will only radiate in odd modes and its radiation can be predicted using far field approach. Measured properties of the gap using pdd and even modes of resonances gave results which are very close to the theoretical values up to 18 GHz. Resonator construction, ways of ... View full abstract»

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  • Phased Array Matching with Grating Lobe Reduction

    Publication Year: 1980, Page(s):139 - 143
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    An analysis is given of a method of phased array grating lobe suppression and matching in the inifinite array approximation. The method is suited to limited scan operation but not restricted to it. The theoretical approach is also applicable almost unchanged, to the design of strip polarizers and a class of waveguide directional couplers. View full abstract»

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  • Analysis and Tolerance Study of an Array Antenna for a New Generation of Secondary Radars

    Publication Year: 1980, Page(s):144 - 148
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    An open array antenna is analyzed considering performance and tolerances with respect to the specifications given by Eurocontrol and F.A.A. Computed results and parametric charts are presented. The analytical methods used briefly described. Some considerations on the choice of the radiating element (slot or dipole) are given with respect to the wished performance. View full abstract»

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  • The Prismatic Array Antenna a non Dispersive Travelling Wave Array Antenna

    Publication Year: 1980, Page(s):149 - 152
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    The prismatic array antenna is a new array antenna, the maximum gain direction of which is almost stationnary in the frequency band. A first scattering array acts as a feed for a second array tilted relative to the first one at some specific angle. Between the two arrays, propagation may be either a guided-space one (between parallel plates for example) or a free-space one (in case of two-dimensio... View full abstract»

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  • Array Antenna on a Dielectric Layer

    Publication Year: 1980, Page(s):153 - 158
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    Antennas of this type constitute a significant progress in the construction of complex linear antenna arrays used in micro-wave range because of their specific production technology. However, no theoretical characteristics of those antennas on a dielectric layer exist. The paper presents results of an analysis of radiation characteristics for an antenna array on a dielectric without a screen. We d... View full abstract»

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