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Microwave Conference, 1976. 6th European

Date 14-17 Sept. 1976

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Displaying Results 1 - 25 of 133
  • Contents

    Publication Year: 1976, Page(s):nil1 - nil24
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    Freely Available from IEEE
  • Non Linear Analysis of Three Terminal Avalanche Devices

    Publication Year: 1976, Page(s):3 - 7
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4382 KB)

    The Influence of a thermionic type injected current on the performances of GaAs IMPATT diodes under large signal conditions is studied. This theoretical approach is developed by using the computer program previously elaborated for high efficiency IMPATT diodes. The parameters used to vary the operating conditions are the r. f. level, injection phase, d.c. current multiplication factor and base col... View full abstract»

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  • Performance of Some GaAs Mesfet Mixers

    Publication Year: 1976, Page(s):8 - 13
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4279 KB)

    The performance of MESFET mixers used as down-converters from frequencies around 8 GHz to an intermediate frequency of 1 GHz is presented. Several possible mixer configurations have been considered and preliminary results are described involving the use of the MESFET in single as well as double device circuits. Experimental results concern the devices single sideband. noise figures and associated ... View full abstract»

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  • Minimum Resistance Microwave Diodes

    Publication Year: 1976, Page(s):14 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3692 KB)

    Silicon PIN switching diodes and GaAs varactor tuning diodes have demonstrated 100% performance improvements in quality factor Q by using straightforward optimization techniques, device processing innovations and improvements in materials. Analogous design techniques have been applied to both devices, including careful modeling to identify series resistance contributions, and directed process deve... View full abstract»

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  • Some Novel Characterisation Techniques Used in the Design of X-Band GaAs FET Amplifiers

    Publication Year: 1976, Page(s):19 - 23
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3790 KB)

    Some improved techniques are described for characterising FETs at X-band frequencies. Device s-parameters are measured on an Automatic Network Analyser using co-axial calibration standards, and much better agreement has been obtained between theoretical and experimental amplifier responses. The measurement of minimum device noise figure, and more especially the accurate determination of optimum so... View full abstract»

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  • Highly Reliable CW and Pulsed GaAs Read Diodes

    Publication Year: 1976, Page(s):24 - 24d
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2876 KB)

    The development of GaAs Read Impatt diodes has resulted in the availability of reliable, long life, highly efficient CW and pulsed medium power devices. The use of a hi-lo Read structure with a grown GaAs p-n junction provides for the long life and highly efficient medium power devices. CW efficiencies in excess of 15% are routinely available at power levels of 2-3 watts. Pulse power outputs above... View full abstract»

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  • Small Dayem Bridges as Active Components in Microwave Circuits

    Publication Year: 1976, Page(s):25 - 29
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    We report X-band microwave measurements on superconducting thin film micro-bridges (Dayem bridges), mounted in a half wavelength cavity with an adjustable coupling to match the bridge properly. Power emission from the bridge of 10¿¿13 W in a 10 MHz bandwidth was measured. Current noise fluctuations caused a total voltage line width corresponding to 150-200 MHz, when the voltage across the bridge w... View full abstract»

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  • High Power Low Noise Pt-Schottky Baritt Diodes

    Publication Year: 1976, Page(s):30 - 35
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4331 KB)

    The fabrication of Pt-Schottky Baritt diodes is described. Output power as high as 152 mW at 8.6 GHz has been obtained with an efficiency of 2.3 %. The highest efficiency of the diodes is 3 %. The signal to noise ratio is 150 dB and 100 dB for AM and FM noise, respectively. Minimum noise measure of 17 dB single sideband has been achieved. In Baritt diodes a negative rf-resistance can be obtained b... View full abstract»

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  • Reduced Coupling Aperture of Microstrip Stubs Provides New Aspects in Stub Filter Design

    Publication Year: 1976, Page(s):39 - 43
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2974 KB)

    Generally microstrip stubs are coupled galvanically over the whole cross-section of the adjoining main lines. Reducing the coupling aperture two effects can be observed being superimposed: Smaller coupling apertures lead to higher skirt selectivity, increase, however, the excitation of higher-order modes in the main lines. The resulting transmission characteristics seem to provide new applications... View full abstract»

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  • "The Field Focusing Filter" a Novel form of Microwave Band Branching Filter

    Publication Year: 1976, Page(s):44 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4392 KB)

    The paper describes a new form of microwave branching filter which may be realised in either waveguide or a microstrip form. The filter incorporates a semicircular non resonant cavity in which the various output frequency bands are focused to emerge at different output ports. This concept can provide a large number of matched output channels without the use of circulators and the shape of the outp... View full abstract»

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  • Coplanar Lines : Application to Broadband Microwave Integrated Circuits

    Publication Year: 1976, Page(s):49 - 53
    Cited by:  Papers (45)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4548 KB)

    The paper begins with a brief review of some of the shortcomings of the microwave microcircuit techniques most widely used in research and industry (e.g. microstrip, suspended stripline, and slot line). This is followed by a discussion of the advantages likely to be associated with the utilization of the coplanar line technique. The propagation characteristics are then determined using a digital c... View full abstract»

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  • Resonated Combline Bandpass Filter

    Publication Year: 1976, Page(s):54 - 58
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2995 KB)

    By loading the interior conductors of a classical combline filter with a series resonating impedance, very steep upper band skirt response may be generated. The procedure is particularly interesting for extending etched circuit combline filter technology to the lower microwave frequencies, with significant increases on filter performance and space requirements. View full abstract»

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  • Dielectric Wafer Filters in Waveguide

    Publication Year: 1976, Page(s):59 - 63
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4536 KB)

    Filters comprising dielectric wafers in TE10 mode rectangular, and TE01 mode circular or semi-circular waveguides are described. Their suitability for use in overmoded guides and for high power levels is explained. Design procedures and a computer optimisation process are formulated which allow wafers of standard thickness to be used. Examples of applications in a band-branching unit for a circula... View full abstract»

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  • Design of Low Loss 12 GHz Output Multiplexer for the Second Generation Telesat Canada Satellite

    Publication Year: 1976, Page(s):64 - 68
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4141 KB)

    The basic design considerations for the 12 GHz low loss TE103 filters are described. The synthesis, optimization and realization of a new type low loss non-contiguous triplexer which uses the above filters and a WR75 manifold is presented. Test results of an engineering model unit currently being qualified for use in the F-4 Telesat Canada communications satellite are also provided, and are in goo... View full abstract»

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  • Applications of GTD to Antenna Problems

    Publication Year: 1976, Page(s):71 - 75
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4171 KB)

    A general computer program package based on the geometrical theory of diffraction (GTD) is presented. The programs are based on a modular approach such that a complex geometry is broken down into smaller and simpler substructures. The applicability of the program package is illustrated by a number of examples ranging from dipole antennas mounted on simple geometrical structures to reflector antenn... View full abstract»

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  • Numerical Solution of Transient Electromagnetic Scattering Problems

    Publication Year: 1976, Page(s):76 - 80
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3946 KB)

    A novel computational technique is presented for obtaining the numerical solution of transient electromagnetic scattering problems directly in the time domain. This technique consists of numerically stepping on in time the exact space-time integral equation that represents the solution of the scattering problem. The space-time integral equation and its numerical solution are described. Recent resu... View full abstract»

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  • Microwave Imaging of Rotating Objects with Narrowband Signals

    Publication Year: 1976, Page(s):81 - 85
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4510 KB)

    The experimental investigations as described in this paper are based upon the evaluation of image-field distributions from the scattered fields of rotating objects measured at 36 GHz. Starting with a discussion of the reconstructing formalism and a suitable conversion into Fourier integral form, which is not restricted on small angular ranges, some illustrative examples of reconstruction for simpl... View full abstract»

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  • Transient Fields of Radiating Structures

    Publication Year: 1976, Page(s):86 - 90
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5366 KB)

    A rather simple and general analysis allows calculation of the exact transient near- and far-fields of thin loop antennas, thin linear antennas and apertures directly in the time domain without the knowledge of the time harmonic field. A numerical method (SEM) is used to derive the influence of the antenna radius of linear antennas on the transient near- and far-fields. Application of this tool le... View full abstract»

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  • Integral Equation Formulation for Prediction of Far-Field Radiation Patterns from Near-Field Measurements

    Publication Year: 1976, Page(s):91 - 95
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3510 KB)

    An integral equation formulation in which the plane wave spectrum functions of a measured aperture appear as the unknowns is presented. Solutions to this equation are obtained by expanding the unknwons into sampling series and enforcing the equation at a finite number of near-field measurement points. Considerable amount of computer time can be saved by using an aperture-synthesis-technique in the... View full abstract»

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  • A New Look at the Integral Equation Solution of High Frequency Diffraction Problems

    Publication Year: 1976, Page(s):96 - 97
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1844 KB)

    In this paper we report a transform method for combining the integral equation and high frequency asymptotic techniques, e.g., the geometrical theory of diffraction or GTD. The method takes advantage of the fact that the Fourier transform of the unknown surface current distribution is proportional to the scattered far field. Two methods are developed for systematically improving the initial form o... View full abstract»

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  • Spherical Near-Field Far-Field Techniques

    Publication Year: 1976, Page(s):98 - 102
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4523 KB)

    Spherical wave expansions are well suited to transform measured near-field data of an antenna to far-field data. In this paper a comparison between techniques for obtaining spherical wave expansions from near-field measurements is presented. The techniques are compared with respect to requirements on measuring time, computer storage, computer time and disk storage. It is concluded that the iterati... View full abstract»

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  • A `Microwave Eye' Can be Almost Human

    Publication Year: 1976, Page(s):105 - 111
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5553 KB)

    Microwave imagery is commonly accepted to have inherently lower resolution than optical systems produce, and small scale microwave imaging systems should be particularly poor in this respect. Since Man is an optical imaging system, and also the ultimate recognition system, it is interesting to compare his performance with a microwave lens system which remotely images suitably reflecting targets. I... View full abstract»

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  • Noise Suppression in Microwave Imagery by Exploitation of the MTF Approach to Human Vision

    Publication Year: 1976, Page(s):112 - 116
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    Optimised presentation of images from a microwave holographic system is essential, particularly the suppression of the effects of noise on the human visual system. Recent research into the human visual system has led to Fourier models of the visual cortex, and the proposition that object recognition is possible on relatively few critical low spatial frequency components. It is therefore possible t... View full abstract»

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  • Measurements of 0.915, 2.45 and 9.0 GHz Absorption in the Human Eye

    Publication Year: 1976, Page(s):117 - 121
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4176 KB)

    The absorption of microwave power on the axis of the eye was measured at 0.915, 2.45 and 9.0 GHz on a model of a human head. The absorbed power shows an essentially exponential decrease with the distance from the cornea at 9.0 GHz. At 2.45 and 0.915 a maximum in the absorbed power pattern occurs within the eyeball. The peak values are 50-100% higher for protuberant eyes than for deeper lying eyes.... View full abstract»

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  • A Method to Measure the Characteristics of Biological Materials at Millimeter Waves

    Publication Year: 1976, Page(s):122 - 125
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2915 KB)

    A new method of biological sample characterization at millimeter waves has been studied to verify and extend Webb's experimental results. This method, based on interferometric measurements, is suitable to obtain an absorption spectrum of a living bacterial sediment with a high sensitivity. It has been applied in the frequency range 66-73 GHz. Some experimental results are reported. View full abstract»

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