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IEEE Transactions on Microwave Theory and Techniques

Issue 10 • Date October 1970

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  • [Front cover - Oct. 1970]

    Publication Year: 1970, Page(s):f1 - f2
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  • Table of contents - Oct. 1970

    Publication Year: 1970, Page(s): 681
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  • Contributors, Oct. 1970

    Publication Year: 1970, Page(s):745 - 746
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  • Microwave abstracts

    Publication Year: 1970, Page(s): 747
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  • Information on computer program descriptions

    Publication Year: 1970, Page(s): 748
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  • [Back cover]

    Publication Year: 1970, Page(s):b1 - b2
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  • Measurement of AM Noise in Pulsed Oscillators and Amplifiers

    Publication Year: 1970, Page(s):712 - 715
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The noise properties of amplifiers and oscillators are critical in systems applications. This paper describes a system for the measurement of AM noise in amplifiers and oscillators pulsed on for durations on the order of a microsecond or less. Such a system is useful in measuring AM noise in pulsed solid-state microwave devices such as avalanche- and Gunn-diode simplifiers and oscillators, where h... View full abstract»

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  • Low-Loss Cryogenic L-Band Circulator (Correspondence)

    Publication Year: 1970, Page(s):743 - 745
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    It is shown that a three-port stripline circulator can be constructed to operate in Z-band at 15°K with 0.5 dB insertion loss and up to 20-percent bandwidth for the 20-dB isolation. View full abstract»

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  • The Adjustment of the m-Port Single- Junction Circulator

    Publication Year: 1970, Page(s):705 - 711
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The purpose of this paper is to present a systematic procedure for the adjustment of the m-port single-junction circulator in terms of the scattering-matrix eigenvalues of the junction. The theory used starts by defining the initial location of the scattering-matrix eigenvalues before any adjustment to the junction is made and also by defining the eigenvalue arrangement of an ideal circulator. The... View full abstract»

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  • A Simple Method for Obtaining the System Function of a Cascade Connection of Transmission Lines (Correspondence)

    Publication Year: 1970, Page(s):738 - 740
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A method is presented for finding, by inspection, the system function (i.e., the Laplace transform of the impulse response) of a cascade connection of equal-length TEM-mode transmission lines. View full abstract»

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  • N-Way TEM-Mode Broad-Band Power Dividers

    Publication Year: 1970, Page(s):682 - 688
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    An integrative graphical method of designing a broadband TEM-mode power divider of N output ports is presented. Each branch of the divider's circuit consists of cascaded transmission-line segments, and the corresponding segments of each branch are connected by resistors to a common junction. These resistors absorb the reflected signals due to mismatch at any of the output ports; they are therefore... View full abstract»

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  • The Precision Measurement of Noise Temperature of Mismatched Noise Generators

    Publication Year: 1970, Page(s):715 - 724
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    By refining the technique and analysis of an earlier paper, it is shown that a compensation method is the basis of the most precise measurement of noise temperature, especially for cryogenic noise generators. The measurement system is adjusted so that it is in thermal equilibrium with the generator under test. As is typical for the compensation method, the generator under test may be mismatched, a... View full abstract»

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  • Numerical Formation of Finite-Difference Operators (Correspondence)

    Publication Year: 1970, Page(s):740 - 743
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A matrix formulation is given for the classical Taylor's series method of approximating differential operators by finite differences. This formulation lends itself to digital computation, so that automatic generation of finite-difference formulas becomes possible. A program to perform this task has been written and tested, with good results for those operators of particular interest in microwave t... View full abstract»

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  • Influence of Wall Losses on Energy Flow Center Velocity of Pulses in Waveguides

    Publication Year: 1970, Page(s):689 - 696
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    A rectangular carrier pulse is studied under the assumption of the propagation of a pure basic mode in a circular waveguide with low wall losses. An analytical expression of the electromagnetic field of an output pulse and an analytical expression of, the velocity with which the temporal center of gravity of the axial component of the Poynting vector of a pulse is traveling in a waveguide were der... View full abstract»

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  • Variational Bound Principle for Scattering of Electromagnetic Waves by Obstacles in a Waveguide

    Publication Year: 1970, Page(s):725 - 731
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A formulation is presented for the determination of variational bounds on the even and odd phase shifts that characterize the scattering of electromagnetic waves by symmetric dielectric obtacles in waveguides. The formulation is an extension of a technique recently developed in quantum mechanical scattering theory for the determination of variations bounds on partial-wave phase shifts for scatteri... View full abstract»

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  • Waves and Evanescent Fields in Rectangular Waveguides Filled with a Transversely Inhomogeneous Dielectric

    Publication Year: 1970, Page(s):696 - 705
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    A numerical-calculation method for rectangular waveguides containing a transversely inhomogeneous dielectric is presented. The method is not restricted to the cutoff case or to special inhomogeneities. The relative permittivity of the dielectric can be an arbitrary function of the cross-sectional coordinates. The electric-and magnetic-field strengths, the dispersion characteristics of the propagat... View full abstract»

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  • Frequency Dependence of a Coupled Pair of Microstrip Lines (Correspondence)

    Publication Year: 1970, Page(s):731 - 733
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A Fourier-transform method is used for determining the frequency dependence of the transmission parameters for coupled micro strip lines. Experimental measurements of the even- and odd-mode velocities are described for substrates made of dielectric as well as demagnetized ferrite. The results show a significant difference in the amount of dispersion of the two normal modes of propagation. View full abstract»

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  • C-Band Ultrasonic Delay Line Using Mode Conversion in YAG (Correspondence)

    Publication Year: 1970, Page(s):733 - 734
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A delay line is described which uses longitudinal-to-shear wave conversion to achieve low acoustic loss in YAG with CdS transducers. This device provides 4 μs of delay at 5 GHz with a 6-dB bandwidth of ~1.3 GHz and an insertion loss of ~65 dB. View full abstract»

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  • Scattering of a Shielded Surface Wave by a Wall-Impedance Discontinuity (Correspondence)

    Publication Year: 1970, Page(s):734 - 736
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The Wiener-Hopf technique is used to compute the transmission and reflection coefficients of a shielded surface wave in a parallel-plate waveguide consisting of inductively reactive guiding surfaces and characterized by an abrupt wall-reactance discontinuity. View full abstract»

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  • Loss Calculations for Rectangular Coupled Bars (Correspondence)

    Publication Year: 1970, Page(s):736 - 738
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    By using slope information obtained from Getsinger's or Gupta's charts, it is possible to calculate incidental loss in TEM coupled-line sections using the equation for αcc given in this correspondence. This value of loss factor can then be used to calculate incidental loss in components that include coupled-line sections for which Z02 = Z0eZ... 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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Jenshan Lin
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