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Microwave Theory and Techniques, IEEE Transactions on

Issue 6 • Date Jun. 1971

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Displaying Results 1 - 19 of 19
  • [Front cover - June 1971]

    Publication Year: 1971 , Page(s): f1 - f2
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  • Table of contents - June 1971

    Publication Year: 1971 , Page(s): 503
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  • Numerical Solution of Dielectric Loaded Waveguides: II - Modal Approximation Technique

    Publication Year: 1971 , Page(s): 504 - 509
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (554 KB)  

    A numerical method is described for the solution of the electromagnetic fields in dielectric loaded waveguides. The method uses the cutoff modes of the waveguide, obtained by finite-element analysis, to determine by matrix methods the fields above cutoff. A theoretical comparison with the conventional finite-element method is given and a general, highly efficient computer program for the analysis of dielectric loaded waveguides by the new method is described. Dispersion curves and contour plots obtained from the program are shown for several geometrical configurations, and these results are compared with analytic values and those obtained by the conventional finite-element method. View full abstract»

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  • A 35-GHz Isolator Using a Coaxial Solid-State Plasma in a Longitudinal Magnetic Field

    Publication Year: 1971 , Page(s): 510 - 516
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (723 KB)  

    The device considered in this study is a semiconductor isolator consisting of a circular waveguide with a cylindrical rod of n-type InSb mounted coaxially in the guide. To achieve nonreciprocal operation, the InSb was cooled to liquid nitrogen temperature, a dc magnetic field was applied parallel to the direction of propagation, and a circularly polarized signal was used to excite the waveguide containing the rod. The pertinent solution of Maxwell's equations was programmed for a digital computer to allow numerical evaluation of the characteristics of the isolator using an InSb rod in which losses were present. Experimental data for various parameters and the corresponding calculated data are presented and compared. Low forward loss is achieved with the present coaxial geometry because of strong power concentration effects within or outside of the InSb rod as a function of the direction of propagation. Two series of calculated mode patterns are presented that demonstrate two types of operation of the isolator in achieving a high loss for one direction of propagation, one depending on field displacement, the other on mode coupling. These data are again compared to the experimental evidence. View full abstract»

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  • Determination of Complex Permittivity of Arbitrarily Dimensioned Dielectric Modules at Microwave Frequencies

    Publication Year: 1971 , Page(s): 517 - 521
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (673 KB)  

    A method of evaluating the microwave dielectric properties of any geometrically defined sample is described by general theory and through experimental verification. The typical mathematical relations that describe specimen loss tangent by cavity methods are uniquely modified through inclusion of the derivative of cavity resonant frequency with respect to dielectric constant of the material comprising the particular configuration studied. The dielectric modules under study need not meet the small volume requirements demanded by perturbation theory; they may even occupy a very large volume of the cavity. A particular advantage of the described evaluation technique is the continuity of use of a given dielectric specimen for tests at microwave frequencies, without geometric alteration, after its properties at lower frequencies have been determined. View full abstract»

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  • Scattering by a Ferrimagetic Circular Cylinder in a Rectangular Waveguide

    Publication Year: 1971 , Page(s): 521 - 527
    Cited by:  Papers (18)
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    A general and rigorous formulation of the scattering by a dc magnetized ferrimagnetic cylinder in a rectangular waveguide is derived. This formulation leads to an approximate solution whose error can be quantitatively estimated. As an example, the case in which the ferrimagnetic cylinder is centrally placed is solved. It is shown that previously existing approximate solutions are not valid for the resonant situation in view of their accuracy. View full abstract»

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  • Convergence of Numerical Solutions of Iris-Type Discontinuity Problems

    Publication Year: 1971 , Page(s): 528 - 536
    Cited by:  Papers (67)
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    The convergence of numerical solutions of several iris-type discontinuity problems in waveguides and periodic structures is investigated. It is demonstrated that the numerical solution of a set of equations obtained from a mode-matching procedure (which corresponds to an integral equation formulation of the problem generally known as the moment method) may converge to an incorrect value if an improper ratio is chosen between the number of modal terms in the aperture and the number of terms retained in the kernel of the integral equation. Guidelines for efficient numerical computations are indicated. View full abstract»

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  • Characteristics of Propagating Waves on Yagi-Uda Structure

    Publication Year: 1971 , Page(s): 536 - 542
    Cited by:  Papers (10)
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    Analytic solutions of the current distribution, the k-/spl beta/ diagram, and the cutoff frequencies are obtained for electromagnetic waves propagating on an infinite Yagi-Uda structure. All quantities are expressed in terms of tabulated functions without involving numerical integrations. Theoretical limits of various passbands are also calculated. View full abstract»

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  • Note on the Inversion of the Schwarz-Christoffel Conformal Transformation

    Publication Year: 1971 , Page(s): 542 - 546
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (510 KB)  

    An inversion procedure, based on the methods used in proving Burmann's theorem, is used to provide an integral expression which exhibits the form of the electrostatic field explicitly in terms of the field coordinates. The method is illustrated with an example of a stepped-guide junction. The form of the field and the expression for the mode expansion coefficients are examined. The results are related to the companion problem of solving for the transverse field from a singular integral equation formulation. The two methods agree in the particular case of a two-to-one step for which special simplifications are possible. In the general case, progress in the solution of a class of double-kernel integral equations may be expected through the indirect use of the inversion of the solution obtained from the conformal transformation methods. View full abstract»

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  • On the Complete Eigenvalue Solution of Ridged Waveguide

    Publication Year: 1971 , Page(s): 547 - 555
    Cited by:  Papers (82)  |  Patents (3)
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    The complete solution of the ridged waveguide eigen-value problem is presented. The solution is obtained by the formulation of an integral eigenvalue equation which is subsequently solved numerically by application of the Ritz-Galerkin method. The significance of the eigenvalue spectrum is discussed and the modes are classified as either hybrid or trough modes. Equations are given for the electric and magnetic fields and a brief discussion of the edge singularity is presented. The theory is illustrated by computing the dominant eigenvalues and characteristic impedances of various unsymmetrical ridged waveguides. View full abstract»

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  • Millimeter Wave Power Transmission and Reflection in Semiconductor Image-Converting Systems (Correspondence)

    Publication Year: 1971 , Page(s): 555 - 558
    Cited by:  Papers (1)
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    Power transmitted or reflected at millimeter wave-lengths in image-converting systems using a semiconductor illuminated panel is determined. The panel assembly response is defined and evaluated for two modes of operation. In the reflection mode both the cases of uniform circular light illumination and laser beam illumination of the semiconductor material are considered. In the transmission mode of operation the panel is assumed to be uniformly illuminated apart from a circular shadow region. The effect of recombination velocity at the surface of the semiconductor panel is determined. View full abstract»

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  • 400-MHz Acoustic Surface-Wave Pulse Expansion and Compression Filter (Correspondence)

    Publication Year: 1971 , Page(s): 558 - 559
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB)  

    An acoustic surface-wave device capable of both the generation and compression of a linear FM waveform has been developed. The device has a synchronous frequency of 400 MHz, a dispersive bandwidth of 80 MHz, and achieved a pulse compression ratio of 25:1. The uncompressed pulsewidth is 0.5 /spl mu/s. View full abstract»

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  • Foreshortening of Microstrip Open Circuits on Alumina Substrates

    Publication Year: 1971 , Page(s): 559 - 561
    Cited by:  Papers (15)
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    One particular discontinuity encountered in microstrip circuitry, the end effect of microstrip lines, is discussed. Experimental data of the end effect of 10 microstrip lines are plotted and compared with previously published data. Results reported here are consistent with that which is known about the edge effect of uniform microstrip transmission lines. View full abstract»

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  • On High-Power Circulators with Mismatched Terminations (Correspondence)

    Publication Year: 1971 , Page(s): 561 - 562
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    A comparison of the signal level in the ferrite-loaded sections of high-power circulators shows that the advantage presented by the coupled-line approach decreases when the device is terminated into a mismatch. View full abstract»

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  • A Note on the Dielectric-Filled Waveguide as a Delay Line for Pulse Compression (Correspondence)

    Publication Year: 1971 , Page(s): 562 - 563
    Cited by:  Patents (1)
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    For equal group delays, bandwidth, and frequency, a dielectric-filled waveguide is always Iossier than an empty one, even if the dielectric is Iossless. View full abstract»

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  • Toroid Corner Chamfering As a Method of Improving the Figure of Merit of Latching Ferrite Phasers (Correspondence)

    Publication Year: 1971 , Page(s): 563 - 564
    Cited by:  Papers (7)
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    Corner chamfering of latching phaser toroids has been investigated. It is shown that the resulting increase in differential phase shift is a function of the dielectric loading of the toroid slot. View full abstract»

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  • Contributors, Jun. 1971

    Publication Year: 1971 , Page(s): 565 - 566
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  • Microwave abstracts

    Publication Year: 1971 , Page(s): 567 - 568
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  • [Back cover]

    Publication Year: 1971 , Page(s): b1 - b2
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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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