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Microwave Theory and Techniques, IEEE Transactions on

Issue 7 • Date July 1970

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Displaying Results 1 - 23 of 23
  • [Front cover - July 1970]

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

    Publication Year: 1970 , Page(s): 337
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  • On the Inadequacy of Descrete Mode-Matching Techniques in Some Waveguide Discontinuity Problems (Discussion)

    Publication Year: 1970 , Page(s): 369 - 372
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    First Page of the Article
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  • Correction to "A Computer Optimization of the Rayleigh-Ritz Method"

    Publication Year: 1970 , Page(s): 412
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    First Page of the Article
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  • Contributors, Jul. 1970

    Publication Year: 1970 , Page(s): 412 - 414
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  • Information on computer program descriptions

    Publication Year: 1970 , Page(s): 415
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  • Information for authors

    Publication Year: 1970 , Page(s): 416
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  • [Back cover]

    Publication Year: 1970 , Page(s): b1 - b2
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  • A Simple Technique for Real-Time Measurement of Complex Reflection Coefficient (Correspondence)

    Publication Year: 1970 , Page(s): 410 - 412
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    A simple method for making real-time measurements of complex reflection coefficient px is described. The technique uses a hybrid tee and two crystal detectors to provide analog outputs from which the reflection coefficient is obtained. Sample measurements of px made at 34.3 GHz are presented which indicate a precision of greater than 0.02 units and 0.05 radians in magnitude and argument, respectively, for 0.1 ≤|px|≤ 1.0. View full abstract»

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  • The Influence of Cataphoresis Upon the Noise Temperature of F8T5 Lamps

    Publication Year: 1970 , Page(s): 393 - 400
    Cited by:  Papers (5)
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    Fluorescent lamps were once used as standard noise sources for microwave measurements. Because of unpredictable noise output, they were abandoned in favor of pure-gas discharge tubes. It is shown that the unpredictability resulted from changes in Hg vapor pressure which were indirectly caused by cataphoretic pumping of the Hg ions. Data are presented which give excess noise as a function of discharge current and as a function of bulb temperature. These data were obtained for normal and abnormal lamps at 147 MHz. View full abstract»

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  • On the Inadequacy of Discrete Mode-Matching Techniques in Some Waveguide Discontinuity Problems

    Publication Year: 1970 , Page(s): 364 - 369
    Cited by:  Papers (26)
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    It is shown that inattention to the limits of validity of a field expansion can lead to field matching along impermissible boundaries. Nevertheless the error may not show up in any obvious way, since the method amounts to an expansion in terms of an incomplete modal set. The "diffusion" of a discrete mode into a continuum takes place in a distance which may be of the order of a tenth of a wavelength or more, so that in fact fairly accurate numerical results can nevertheless ensue over quite a range of parameters. This would seem to be the case for some examples taken from the literature in which the analysis has apparently been undertaken on the assumption that the initial formulation was exact. View full abstract»

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  • Microwave Properties of a Rectangular Waveguide Semi-Infinitely Filled with Magnetic Material (Correspondence)

    Publication Year: 1970 , Page(s): 400 - 402
    Cited by:  Papers (1)
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    An infinite, lossless, rectangular waveguide semi-infinitely filled with a transversely magnetized magnetic material is discussed. With the limitation that only TEno modes are incident, an analytic solution for the transmitted and reflected energies is presented. Numerical computations near resonance are presented both for a ferrite and an easy-axis antiferromagnet. View full abstract»

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  • Design Tables for a Class of Optimum Microwave Bandstop Filters (Correspondence)

    Publication Year: 1970 , Page(s): 402 - 404
    Cited by:  Papers (9)
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    Element value tables for optimum microwave bandstop filters consisting of quarter-wave spaced shunt open-circuited stubs are given. Both the stubs and the connecting unit elements contribute to the attenuation response. The tables give element values for 0.01dB, 0.10 dB, and 0.25 dB ripple Chebyshev designs with up to twenty-three elements, and for bandwidths between 30 percent and 150 percent. View full abstract»

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  • Propagation in a Rectangular Waveguide Partially Filled with a Linearly Varying Dielectric

    Publication Year: 1970 , Page(s): 404 - 406
    Cited by:  Papers (1)
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    A closed form solution for the TElo mode in a rectangular waveguide partially filled with a linearly inhomogeneous dielectric is obtained. The dielectric is assumed to vary linearly in one transverse direction. The theory developed for the partially filled waveguide is extended to consider the characteristic equation of the completely filled waveguide with a linearly inhomogeneous dielectric. The phase velocity of the fields in the waveguide is studied by considering the ω / β diagrams. View full abstract»

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  • Experiments of a Discrete Reflecting Beam Waveguide with Parabolic Cylindrical Reflectors

    Publication Year: 1970 , Page(s): 348 - 351
    Cited by:  Papers (1)
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    The new beam waveguide with parabolic cylindrical reflectors, analyzed in another paper, has been constructed and experimentally investigated. The measurement of the attenuation is in fairly good agreement with the theoretical attenuation constant if surface roughness and installation error of the reflector are taken into account. By the fundamental experiment for train RADAR application, with various obstacles placed inside this beam waveguide, it is shown that the measured reflection from metallic obstacles is in good agreement with theoretical calculations. View full abstract»

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  • Microwave Properties of Slabs of Uniformly Magnetized Material Filling the Cross Section of a Rectangular Waveguide Operating in TENO Modes

    Publication Year: 1970 , Page(s): 377 - 382
    Cited by:  Papers (3)
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    The microwave properties of a slab of uniformly magnetized material filling the cross section of an infinite, lossless rectangular waveguide operating only in TENO modes are discussed analytically. The material is assumed to have a scalar permittivity and a permeability describable by a tensor of the Polder form. A dc magnetic field is applied normal to the broad wall of the waveguide. Two cases are treated in detail. 1) The slab is placed against a metal shorting wall. 2) The slab is placed with empty waveguide on each side. A general analytical solution is obtained for both cases. Numerical values are computed for MnF2, an easy-axis antiferromagnet. The computed values for the second are compared with values calculated on the basis of a plane-wave approximation and with experimental data. Applications of the technique to experimental measurements are described. View full abstract»

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  • Considerations on Matrix Methods and Estimation of Their Errors

    Publication Year: 1970 , Page(s): 352 - 359
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (688 KB)  

    Two-dimensional field equations are reduced to Fredholm integral equations of the second kind. The integral equations are solved by matrix methods. The convergence of the matrix solutions is discussed. The matrix methods are applied to calculating the cutoff wavenumbers of waveguides. A method of estimating the errors is proposed. A method of correcting the matrix solutions is described and applied to a field problem in which the boundary is large compared with the wavelength. It is pointed out that for the commonest method of solving integral equations numerically (the method of subsections), the accuracy depends strongly on the position in each subsection of the point to which the field is referred. The dependence of the error on position is examined quantitatively. View full abstract»

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  • Transmission Bandwidth of a Lens Waveguide with a Curved Axis

    Publication Year: 1970 , Page(s): 373 - 376
    Cited by:  Papers (1)
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    In a lens waveguide with a curved axis, light beams appreciably different in frequency split and take different paths due to the effect of chromatic aberration of lens. The deviation from a main beam can grow cumulatively through the curved lens waveguide. This effect knits permissible bandwidth to be transmitted without loss of beams. For bends having tilts and offsets at the connections to the straight waveguides, the deviation of the light beam from the guide axis due to the effect of chromatic aberration is derived. With random circular bends the bandwidth is inversely proportional to the square root of the number of bends and proportional to the average radius of curvature. For a normal design of the curved waveguide the allowable bandwidth is expected to be sufficiently broad for signal transmission, but it is narrow in the sense of optical frequency. View full abstract»

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  • An 18 GHz Single-Tuned Parametric Amplifier with Large Gain Bandwidth Product (Correspondence)

    Publication Year: 1970 , Page(s): 409 - 410
    Cited by:  Papers (2)
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    A single-tuned parametric amplifier was experimentally demonstrated at 18 GHz. A coaxial signal circuit and a radial idler cavity were used to obtain a large voltage-gain bandwidth product of 1440 MHz and a low noise temperature of 245°K including the circulator loss contribution. View full abstract»

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  • Coupling of Modes on a Tapered Dielectric Cylinder

    Publication Year: 1970 , Page(s): 383 - 392
    Cited by:  Papers (24)  |  Patents (1)
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    A generalized coupled-mode formulation is presented for propagation in nonuniform media, where the modes are those associated with both the discrete and continuous eigenvalue spectrum. The theory includes metallic and dielectric waveguide non-uniformities as special limiting cases. Analytic results are presented for a multimode linear tapered dielectric cylinder excited by the HE11 mode. View full abstract»

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  • Comparisons of Waveguide Losses Calibrated by the DC Potentiometer, AC Ratio Transformer, and Reflectometer Techniques (Correspondence)

    Publication Year: 1970 , Page(s): 406 - 409
    Cited by:  Papers (1)
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    Comparisons are made of the losses of two precision waveguide sections that were calibrated by three independent attenuation measurement methods. The loss measurement systems involved were the 1) dual-channel system which uses thermistors and a dc potentiometer test set, 2) dual-channel system which uses barretters and an ac ratio transformer test set, and 3) Nationaf Bureau of Standards reflectometer system which utilizes a quarter-wave short circuit and an IF attenuation standard. Loss values of about 0.05 dB, as calibrated by the three independent methods, typically agreed to within 0.0006 dB. It is believed that the results of these calibrations are representative of the best that can be achieved with current state-of-the-art techniques and available instrumentation for low-loss waveguide measurements. View full abstract»

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  • A Theoretical Analysis of Discrete Reflecting Beam Waveguide with Parabolic Cylindrical Reflectors

    Publication Year: 1970 , Page(s): 338 - 347
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    A discrete reflecting beam waveguide with parabolic cylindrical reflectors, proposed by M. Kamimura, is theoretically analyzed. Electric field elementary waves on the reflector and the exciting primary electric field from the launcher are represented in the elliptic cylindrical coordinate system, and boundary conditions on the reflector are introduced to derive simultaneous integral equations regarding the reflector current. By solving these integral equations approximately, the integral representation of the secondary electric field in the beam waveguide is obtained, and poles and residues of the integrand are calculated to obtain the propagation constant of the beam waveguide and beam waveguide modes. The beam waveguide mode reflected toward the transmitting side when an obstacle is placed in the beam waveguide is obtained. View full abstract»

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  • Millimeter Wave Attenuation through Illuminated Semiconductor Panel

    Publication Year: 1970 , Page(s): 360 - 364
    Cited by:  Papers (2)
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    Attenuation of millimeter wave energy through light-illuminated semiconductor panels is determined. The expressions for the attenuation are applied to cases of uniform circular light excitation and laser beam excitation of the panel. Families of curves are given for the attenuation as a function of ratio of distance from the center of excitation to the diffusion length of the semiconductor material. The effect of surface recombination velocities of semiconductor panels is also considered. View full abstract»

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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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