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Microwave Theory and Techniques, IEEE Transactions on

Issue 12 • Date Dec. 1978

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Displaying Results 1 - 25 of 28
  • [Front cover - Dec. 1978]

    Publication Year: 1978 , Page(s): f1 - f2
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  • 1978 Index, IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-26

    Publication Year: 1978 , Page(s): i - xvi
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  • Table of contents - Dec. 1978

    Publication Year: 1978 , Page(s): 925
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  • Freely Available from IEEE
  • [Back cover]

    Publication Year: 1978 , Page(s): b1 - b2
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  • An Approximate Dynamic Spatial Green's Function for Microstriplines

    Publication Year: 1978 , Page(s): 978 - 983
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    A dynamic model of both charge aud current images is constructed to give rise to a frequency-dependent dyadic Green's function in the space domain for rnicrostriplines. While the spatial Green's function is approximate, its image model is very simple, and the propagation constants calculated from it agree well with published results. View full abstract»

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  • 1.6-Gb/s 16-Level Superposed APSK Modem with Baseband Signal-Processing Coherent Demodulator

    Publication Year: 1978 , Page(s): 945 - 951
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1208 KB)  

    A 1.6-Gb/s 16-level superposed APSK modem using a newly developed baseband signal-processing coherent demodulator is described. ln the modulator, the superposing modulation method is adopted in which two QPSK carriers having different levels are superposed so that the combined signal forms a 16-level APSK carrier. Sixteen signal points are arranged in lattice form on the signal space. In the demodulator, a newly developed carrier recovery loop is adopted in which quantizing error signals are detected in the process of data regeneration; they are used for generating the phase error signal to control a VCO. The principles of operation and theoretical analysis of this carrier recovery loop is described, through which it is shown that the recovered carrier has inherently low-pattern jitter power. Furthermore, it features a very simple circuit configuration. The circuit configurations of an experimental modem and some important test results are deseribed in detail. It is shown that the modem has improved performance characteristics in such a high-speed region as 1.6 Gb/s while its circuit configuration is much simplified. View full abstract»

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  • Editor's Overview, Dec. 1978

    Publication Year: 1978 , Page(s): 926
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    With the 1978 International Microwave Symposium now behind us, it is good to review some of the highlights and to sample the technical content by publishing several of the papers presented in expanded form. View full abstract»

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  • Noise and Transfer Properties of Harmonically Synchronized Oscillators

    Publication Year: 1978 , Page(s): 939 - 944
    Cited by:  Papers (4)
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    A theoretical model of a harmonically synchronized oscillator is developed. Using this model output power, stability conditions, noise, and transfer properties of a harmonic frequency divider are calculated and discussed. View full abstract»

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  • The 1978 International Microwave Symposium

    Publication Year: 1978 , Page(s): 927 - 931
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    The 1978 MTT International Microwave Symposium was organized by the Ottawa chapter of MTT with very significant assistance of members of the Montreal chapter. It was held at the Chateau Laurier Hotel, Ottawa, Canada, the first venture outside the United States of America. View full abstract»

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  • Exact Calculation of the Uncertainty on the Input Reflection Coefficient of Arbitrary Two Ports Due to Mismatches and Arbitrary Reference Planes

    Publication Year: 1978 , Page(s): 973 - 978
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    A specific problem of worst case analysis of microwave networks is dealt with. Exact formulas are derived for the upper and lower limits of the amplitude of the input reflection coefficient of an arbitrary two port, in the presence of mismatched source and load and/or arbitrary reference planes. The derivation is based on certain properties of the bilinear transformation. View full abstract»

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  • Computer-Aided Filter Alignment and Diagnosis

    Publication Year: 1978 , Page(s): 958 - 963
    Cited by:  Papers (8)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    The cavity resonant frequencies and coupling values of a wide range of bandpass filters, band-reject filters, and equalizers have been determined in situ by computer-adjusting analytic models to fit the scattering parameters measured on an automatic network analyzer. A higher order mode elliptic filter, a dual-mode quasi-elliptic filter, and a dual-mode band-reject filter are presented as examples. The general relationships between mechanical dimensions and circuit parameters are discussed. The circuit adjustment procedure is outlined, and equations for the sensitivity coefficients of several element types are tabulated. View full abstract»

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  • Reflection of Magnetostatic Forward Volume Waves by a Shallow-Grooved Grating on a YIG Film

    Publication Year: 1978 , Page(s): 1039 - 1044
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    The magnetostatic forward volume wave (MSFVW) reflection characteristics of a uniform grating of shallow grooves etched on the planar surface of an epitaxial YIG film are treated using an approach which integrates field theory with the coupled-mode approach. The MSFVW reflectivity per groove is found to be comparable to the reflectivity of magnetostatic surface waves (MSSW's) and thus is found to be significantly large considering that the volume waves are reflected by surface-localized and shallow grooves. View full abstract»

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  • Simulation Study of Electronically Scannable Antennas and Tunable Filters Integrated in a Quasi-Planar Dielectric Waveguide

    Publication Year: 1978 , Page(s): 987 - 991
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    Preliminary studies on electronically scannable leaky-wave antennas integrated in a dielectric waveguide are reported. Electronic scan is simulated by a small mechanical motion from which the relation between the scan angle and the necessary change in the dielectric constant can be derived. The work is also applicable to electronically tunable bandstop filters. View full abstract»

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  • Surface-Oriented Transferred-Electron Devices

    Publication Year: 1978 , Page(s): 1023 - 1028
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    The application of MESFET technology to the manufacturing of surface-oriented transferred-electron devices (TED's) with parmeters close to GaAs MESFET's is discussed. The limitations related to the contact resistance, fringing capacitance, domain formation time, impact ionization, and heat sinking are analyzed for GaAs and InP devices. Our estimates show that the surface-oriented devices can be used as microwave LSA generators at higher frequencies than the conventional LSA diodes. In a domain mode, the surface-oriented TED's can yield low values of the power-delay product comparable to those of GaAs MESFET's at higher speeds. The analysis of impact ionization within a high-field domain leads to a conclusion that even InP logic devices with practical lengths of the active layer can be manufactured with doping densities up to 1017cm-3. The estimate of the temperature rise indicates that a CW operation is possible for practical device parameters. Because the parameters of surface-oriented TED's are similar to those of GaAs MESFET's they may be manufactured using the rapidly developing GaAs integrated-circuit technology and used in combination with GaAs MESFET's. View full abstract»

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  • A Simple Method for Analyzing Fin-Line Structures

    Publication Year: 1978 , Page(s): 1002 - 1007
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    A first-order design theory for fin-line circuits is developed by establishing a correspondence between a fin line and a set of rectanguIar waveguides. The usefulness of the method is demonstrated by applying it to the analysis of a transition from a fin line to a below-cutoff waveguide. Finally, theoretical and experimental results are given for a bandpass filter, which show a fairly good agreement. View full abstract»

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  • Measurements of Excitation Condition and Quantitative Mode Analysis in Optical Fibers

    Publication Year: 1978 , Page(s): 992 - 997
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    The purpose of this paper is to describe an accurate method for determining the modal-power distribution along optical fibers and also to present a technique for measuring the launching conditions produced by an input laser beam. Experimental results demonstrate both the accuracy and the effectiveness of those methods for investigating the transmission characteristics of optical waveguides. Various factors having an important influence upon the accuracy are discussed, and appropriate methods for minimizing the systematic errors also are presented. View full abstract»

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  • 1977 MTT Awards

    Publication Year: 1978 , Page(s): 932 - 934
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    At the annual Symposium Banquet, MTT President Harold Sobol presented the following MTT Society awards for the year 1977: View full abstract»

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  • Cryogenic Millimeter-Wave Receiver Using Molecular Beam Epitaxy Diodes

    Publication Year: 1978 , Page(s): 935 - 938
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    A millimeter-wave cryogenic receiver has been built for the 60-90-GHz frequency band using GaAs mixer diodes prepared by molecuIar beam epitaxy (MBE). The diodes are mounted in a reduced-height image rejecting waveguide mixer which is followed by a cooled parametric amplifier at 4.5-5.0 GHz. At a temperature of 18 K the receiver has a total single-sideband (SSB) system temperature of 312 K at a frequency of 81 GHz. This is the lowest system temperature ever reported for a resistive mixer receiver. The low-noise operation of the mixer is seen to be a result of 1) the short-circuiting of the noise entering the image port and 2) an MBE mixer diode with a noise temperature which is consistent with the theoretical shot noise from the junction and the thermal noise from the series resistance. View full abstract»

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  • New Results in Network Simulation, Sensitivity, and Tolerance Analysis for Cascaded Structures

    Publication Year: 1978 , Page(s): 963 - 972
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (728 KB)  

    An attractive, exact, and efficient approach to network analysis for cascaded structures is presented. It is useful for sensitivity and tolerance analyses, in particular, for a multiple of simultaneous large changes in design parameter values. It also facilitates the exploitation of symmetry to reduce computational effort for the analysis. Responses at different loads in branched networks, which may be connected in series or in parallel with the main cascade, can be obtained analytically in terms of the variable elements. Sensitivity and large-change effects with respect to these variables can be easily evaluated. The approach is not confined to 2-port elements but can be generalized to 2p-port cascaded elements. View full abstract»

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  • Calibrating the Six-Port Reflectometer by Means of Sliding Terminations

    Publication Year: 1978 , Page(s): 951 - 957
    Cited by:  Papers (123)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (680 KB)  

    The six-port technique promises to have a major impact on the next generation of automatic network analyzers because complex heterodyne methods may be replaced by simple amplitude detectors. This projection, however, is predicated upon the existence or development of calibration techniques which permit one to conveniently and accurately obtain the parameters which characterize the six-port. This paper describes a number of substantial refinements to a previously described procedure which is based upon the use of sliding terminations. View full abstract»

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  • YIG Resonator Circuit with Isolator Property and its Application to a Gunn Diode Oscillator

    Publication Year: 1978 , Page(s): 1035 - 1039
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    This paper presents the analysis and experiment of a newly developed YIG resonator circuit with isolator property, which is constructed with a YIG sphere, three coupling loops, and a 3-dB stripline directional coupler. This YIG circuit can be used advantageously as the toning element of a magnetically tunable oscillator. The circuit has an advantage in preventing frequency pulling and the variation of output power level of the oscillator due to a change in load condition because of the resonator circuit having isolator property at the same time. The design procedure and experiment of a magnetically tunable Gunn diode oscillator with the YIG circuit is also shown. It has been confirmed that the YIG circuit when applied to a tunable oscillator is quite useful. View full abstract»

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  • Generalized Spectral Domain Method for Multiconductor Printed Lines and its Application to Turnable Suspended Microstrips

    Publication Year: 1978 , Page(s): 983 - 987
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    An efficient method is developed for obtaining propagation characteristics of microstripline type structures in which a number of conductors are located on various interfaces. Specific computations have been carried out for suspended microstripline structures with tuning conductive septums. A number of data useful for design are included. View full abstract»

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  • Groove- and H-Waveguide Design and Characteristics at Short Millimetric Wavelengths

    Publication Year: 1978 , Page(s): 998 - 1001
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    The design of the H guide and groove guide for use in the short millimetric range with relatively low-loss, Iow-dispersion, and single-mode operation is considered. Measurements at 40 and 100 GHz show encouraging characteristics. It is considered feasible to construct components to form complete systems in these guides. View full abstract»

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  • A Technique for Predicting Large-Signal Performance of a GaAs MESFET

    Publication Year: 1978 , Page(s): 1017 - 1023
    Cited by:  Papers (85)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    A method is described for accurately predicting the nonlinear microwave performance of GaAs MESFET devices. The method utilizes time-domain analysis and is based upon the experimentally characterized bias dependence of device-circuit model elements. Precise predictions are made of fundamental and harmonic power levels up to 6 dB of gain compression. View full abstract»

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Aims & Scope

The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design..

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Meet Our Editors

Editor-in-Chief
Dominique Schreurs
Dominique.Schreurs@ieee.org

Editor-in-Chief
Jenshan Lin
jenshan@ieee.org