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Microwave Conference, 1981. 11th European

Date 7-11 Sept. 1981

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Displaying Results 1 - 25 of 148
  • Contents

    Publication Year: 1981, Page(s):nil1 - nil27
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    Freely Available from IEEE
  • Techniques for Optical Fibre Transmission

    Publication Year: 1981, Page(s):3 - 10
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8634 KB)

    A review is presented of the most significant characteristics of devices for optical fibre transmission. Some fundamental limitations in optical transmission are mentioned and the performance of digital and analog systems is discussed. View full abstract»

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  • Advances in Microwave Remote Sensing

    Publication Year: 1981, Page(s):11 - 17
    Cited by:  Papers (1)
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    First Page of the Article
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  • High Speed Low Power Circuits with Josephson Junctions

    Publication Year: 1981, Page(s):18 - 27
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    After a phenomenologic description of the Josephson effect, performance data of oscillators, detectors, mixers and parametric amplifiers as well as of integrated memory and logic circuits with Josephson junctions are presented. View full abstract»

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  • GaAS Digital ICs for High-Speed Signal Processing

    Publication Year: 1981, Page(s):28 - 37
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (11390 KB)

    This paper reviews the basic concepts of digital signal processing, the principal functions needed by special-purpose hardware implementation, and the main features and present status of high-speed digital GaAs ICs technology, with some illustrations of potential applications in future radar and telecommunication systems. View full abstract»

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  • 20/30 GHz Communication Systems: Microwave Hardware Requirements in the Near Term, and Present Achievements.

    Publication Year: 1981, Page(s):38 - 47
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    This paper reviews some of the planned 20/30 GHz Satellite Communication Systems. Recent achievements are presented and correlated to System Designer's requirements, highlighting critical areas needing effort for near term applications. Some speculative thoughts on second generation Payload Architectures are given, in view of expected technology developments in some years from now. View full abstract»

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  • Advances in Microwave GaAs Power FET Device and Circuit Technologies

    Publication Year: 1981, Page(s):48 - 58
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (9365 KB)

    The latest advances in microwave GaAs power FET device and circuit technologies are discussed. Optimum device structures and design parameters for operating frequencies up to K-band are covered. Broadband matching networks for hybrid power GaAs FET amplifiers are described. These matching networks were obtained with CAD technique, using FET equivalent circuit models deduced from S-parameter charac... View full abstract»

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  • Recent Advances in Multibeam Antennas

    Publication Year: 1981, Page(s):59 - 72
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (18326 KB)

    An overall survey of the multibeam spacecraft antenna technology is given on the basis of recent theoretical and experimental work at GE's Space Systems Division. Results are included for a 3.53 m diameter, offset fed paraboloid illuminated by a 16 reconfigurable feed in the 5.925-6.725 GHz frequency band. The paper is based in part on work under the sponsorship and technical direction of the Inte... View full abstract»

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  • RF Systems for Large Particle Accelerators

    Publication Year: 1981, Page(s):73 - 80
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    General trends of RF systems for particle accelerators of ever-increasing energy are reviewed, with special emphasis on the CERN accelerators. View full abstract»

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  • Phased Arrays - Current Technology and Future Prospects

    Publication Year: 1981, Page(s):81 - 90
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10928 KB)

    The paper reviews the basic techniques of electronic scanning in phased arrays and identifies current implementations of those techniques. The applications most suited to phased arrays are discussed for both radar and satellite communications. The role of microwave semiconductor devices in future active arrays and the importance of monolithic technology is emphasised. Other future prospects includ... View full abstract»

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  • Cascade Synthesis of Lumped and Distributed Networks by Means of the Minkowski Model of Lorentz Space

    Publication Year: 1981, Page(s):93 - 98
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3878 KB)

    The Minkowski model of three-dimensional Lorentz space with its submodels of two-dimensional hyperbolic space, namely the Cayley-Klein model, the polar Poincaré model (the Smith Chart), and the rectangular Poincaré model (the Z-plane), can be used both constructively and as a guiding light in the analysis and synthesis of cascaded lumped and distributed two-port networks. The Minkowski model con... View full abstract»

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  • The Design of Microstrip Directional Couplers using Exponential Lines

    Publication Year: 1981, Page(s):99 - 104
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3189 KB)

    Accurate formulas are derived for the scattering parameters of coupled exponential transmission lines (CETL) in inhomogeneous media. The formulas are used to design wide-band directional couplers. Practical measurements on designed couplers prove the accuracy of the derived formulas. View full abstract»

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  • Asymmetric Synthesis

    Publication Year: 1981, Page(s):105 - 110
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3376 KB)

    This paper details a synthesis procedure suitable for realisation in a number of microwave media, and which allows attenuation poles to be placed on one side of the passband of a filter. This greatly increases the selectivity of the device on that side of the passband. An example is given of a sixth degree waveguide filter with two extracted poles on the upper side of the passband. View full abstract»

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  • Odd-Degree Pseudoelliptical Phase-Equalized Filter with Asymmetric Band-Pass Behaviour

    Publication Year: 1981, Page(s):111 - 116
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4437 KB)

    The paper considers an odd-degree band-pass filter with a single real-frequency attenuation pole and one pair of complex-frequency transmission zeros. The design is particularly suitable for single-sideband selection. For stated phase and amplitude specs, it results in a low degree of complexity, in comparison with conventional band-pass filters having an even number of transmission zeros. An appr... View full abstract»

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  • Technology for a 29 GHz Local Distribution Radio

    Publication Year: 1981, Page(s):119 - 125
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5164 KB)

    A microwave link equipment for the 27.5-29.5 GHz frequency band is being developed by British Telecom for use in the Local Network. To keep the equipment cost compatible with single subscriber service microwave integrated circuit techniques are exploited. Narrowband filters at 29 GHz have been produced with good reproducibility using chemical milling. Evaluation of Ba2 Ti9 020 dielectric resonator... View full abstract»

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  • Low Noise Microwave Receivers for Radio Application

    Publication Year: 1981, Page(s):126 - 131
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3626 KB)

    After a survey on "image recovery" microwave mixers, the paper presents a complete line from 2 to 11 GHz of new low noise wide-band microwave receivers using field effect transistor preamplifier. Design criteria and achieved performances are shown. View full abstract»

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  • Large Capacity Digital Radio Systems using 16QAM and 8PSK Modulation

    Publication Year: 1981, Page(s):132 - 138
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6462 KB)

    This paper is a report on the features and performances of the digital radio systems using 16QAM and 8PSK developed for large capacity trunking systems. A study on interference is one of the topics in this paper. Digital to digital and digital to analog interferences are discussed on the basis of measured performances. Another topic dealt with concerns the outage characteristic due to multipath di... View full abstract»

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  • A QPRS 140 Mb/s Digital Radio Relay System in the 11 GHz Band

    Publication Year: 1981, Page(s):139 - 144
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    A high-capacity digital radio relay system operating in the 11 GHz band has been developed and tested in the laboratory. The modulation method used is Quadrature Partial Response Signalling (QPRS). The system is designed to use the existing frequency plan for the 11 GHz band according to CCIR rec. 387-3, giving an overall spectrum utilization of 3.08 bit/s/Hz. View full abstract»

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  • Linear-Phase Stripline Filter

    Publication Year: 1981, Page(s):147 - 152
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    A realization of narrow-passband planar printed circuit microwave filter having real and complex transmission zeros is presented. The filter consists of two symmetric capacitively coupled resonator chains which are coupled inductively together. These filters can be used in applications where an efficient phase-equalization together with amplitude selectivity is required. View full abstract»

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  • A Waveguide Filter as Low Loss Delay Element for Direct DCPQSK Demodulation

    Publication Year: 1981, Page(s):153 - 157
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3617 KB)

    A waveguide delay element for direct DCQPSK demodulation operating at 14 GHz is presented. A temperature stable 16.7 ns delay is achieved by a single linear phase dual-mode filter. The device shows a compactness and hightness comparable with a microstrip solution, but displays a much lower insertion loss. This permits a significant relaxation of some critical demodulator specifications. View full abstract»

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  • Microwave Directional Filter using Suspended Dielectric Resonators

    Publication Year: 1981, Page(s):158 - 163
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5082 KB)

    A novel simple realization of the directional filter using dielectric resonators suspended between two single microstrip lines has been described. The structure of the proposed filter allows easy coupling adjustment and frequency tuning by means of changing the distance between the two microstrip lines being coupled via a dielectric resonator. A simplified method to determine the resonant frequenc... View full abstract»

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  • Parallel-Coupled-Line Filters for Inverted-Microstrip and Suspended-Substrate MIC's

    Publication Year: 1981, Page(s):164 - 168
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3031 KB)

    An improved design procedure is outlined for parallel-coupled-resonator filters in non-homogeneous media such as inverted microstrip and suspended stripline. A modified filter section is used, comprising a parallel-coupled o.c. section in cascade with short un-coupled line sections. Much improved characteristics, both in the pass-band and in the stop-band may be achieved, and the difficulties asso... View full abstract»

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  • The Measurement of Modulation Noise in Microwave Oscillators

    Publication Year: 1981, Page(s):171 - 176
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5341 KB)

    A novel technique is described for the measurement of modulation noise in microwave oscillators. The basis of the system is a delay line discriminator employing a four-port junction, the system is readily set up and calibrated and is inherently broadband. It is easy to operate and can be completely automated. View full abstract»

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  • Accurate Experimental Noise Characterization of GaAs FET's at 18 and 20 GHz through the use of the Noise Waves Model.

    Publication Year: 1981, Page(s):177 - 182
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4690 KB)

    The noise temperature of FET's at 18 and 20 GHz is experimentally determined as a function of the source reflection factor through the use of the recently developed noise waves model. The method appears to be able to provide unbiased results for FET'-chips without any input tuning. Removing the second stage contribution is possible under arbitrary load conditions (with or without output matching).... View full abstract»

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  • Application of an Open Coaxial-Line Resonator for the Determination of the Local Permittivity of Low-Loss thin Slabs at Microwave Frequencies

    Publication Year: 1981, Page(s):183 - 187
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4292 KB)

    A non-destructive method for the determination of the local dielectric constant of thin slab-like materials is investigated. The dielectric material is brought into the electromagnetic fringing field of a suitable unflanged open coaxial-line resonator with a small aperture area. The change of resonant frequency is related to the real part of the permittivity of the tested material. A so called "op... View full abstract»

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