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Microwave Theory and Techniques, IEEE Transactions on

Issue 9 • Date Sep. 1976

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Displaying Results 1 - 21 of 21
  • [Front cover - Sep. 1976]

    Publication Year: 1976 , Page(s): f1 - f2
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    Freely Available from IEEE
  • Comments on "Design Equations for an Interdigitated Directional Coupler" [Letters]

    Publication Year: 1976 , Page(s): 628
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    In the above short paper, Ou derived some design equations for interdigital couplers. The purpose of this letter is to point out a limitation which may not be apparent upon reading the above work. View full abstract»

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  • Correction to "Analysis of Microstrip-Like Transmission Lines by Nonuniform Discretization of Integral Equations" (Letters)

    Publication Year: 1976 , Page(s): 628
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    In the above paper, on page 195, the last line of the Abstract, and on page 198, line 4 of Section V, the abbreviation LSM was erroneously said to represent "linear synchronous motor." The correct meaning is "longitudinal-section magnetic modes." View full abstract»

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  • Contributors, Sep. 1976

    Publication Year: 1976 , Page(s): 629 - 630
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1976 , Page(s): b1 - b2
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    Freely Available from IEEE
  • Analytical IC Metal-Line Capacitance Formulas (Short Papers)

    Publication Year: 1976 , Page(s): 608 - 611
    Cited by:  Papers (49)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    In semiconductor IC technology, capacitance formed by the multilevel interconnection metal lines usually dominate circuit performance. However, for lack of accurate formulas, a numerical method usually has to be used to determine these capacitances. Two analytical capacitance formulas were derived using approximate conformal mapping techniques. One formula gives the capacitance of a finite-thickness metal line over a conducting ground plane, or over a silicon surface. The other formula gives the capacitance of the same metal line, but with an additional conducting metal line over it. The formulas are most accurate for metal lines whose width exceeds the dielectric thickness; accuracy increases with Iinewidth. They are accurate to 1 percent for a metal line whose width is comparable to the dielectric thickness. With these simple formulas, statistical distribution of the metal-line capacitances can be easily determined in a few seconds of computer time. View full abstract»

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  • Electromagnetic Theory of the Loosely Braided Coaxial Cable: Part I

    Publication Year: 1976 , Page(s): 547 - 553
    Cited by:  Papers (10)  |  Patents (4)
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    A solution to Maxwell's equations subject to boundary conditions on counterwound helical wires is achieved. The helices are contained in a cylindrical surface that is concentric to a perfectly conducting center conductor of circular cross section. The permittivity of the annular region may be different from that of the external region. The excitation is taken to be symmetrical about the cable which leads to a considerable simplification of the formulation. The key step is to recognize that the assumed form of the current on the thin helical wires is a spatial harmonic expansion that leads to a doubly infinite expansion, in such harmonics, for the resultant fields. The inherent complication of the problem results from the intercoupling between the spatial harmonics of the helix currents. Various generalizations of the theory are also indicated. View full abstract»

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  • A Perturbation Method for the Analysis of Wave Propagation in Inhomogeneous Dielectric Waveguides with Perturbed Media

    Publication Year: 1976 , Page(s): 559 - 566
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (712 KB)  

    This paper presents a perturbation method for determining the modes and the propagation constants of TE and TM waves in inhomogeneous dielectric waveguides whose index distributions depart from well-known profiles; e.g., a parabolic profile for which exact solutions can be obtained. Applying the variable-transformation technique to the wave equations, the wave-equation problem is transformed into the related-equation problem. The approximate solutions of the wave equations are obtained solving the related equation. The method is applied to the analysis of lower order mode propagation in a near-parabolic-index medium. The first-order field functions and the second-order propagation constants are given. View full abstract»

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  • A New Approximation for the Capacitance of a Rectangular-Coaxial-Strip Transmission Line (Short Papers)

    Publication Year: 1976 , Page(s): 602 - 604
    Cited by:  Papers (10)
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    The method of conformal transformation is used to obtain the exact capacitance of a rectangular-coaxial-strip transmission line. An approximate form, which includes the edge-interaction capacitance of the strip, is obtained and is shown to reduce in an appropriate limit to a form obtained by other authors. View full abstract»

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  • Slow-Wave Propagation Along Variable Schottky-Contact Microstrip Line

    Publication Year: 1976 , Page(s): 566 - 573
    Cited by:  Papers (47)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB)  

    Schottky-contact microstrip lines (SCML) are a special type of transmission line on the semiconducting substrate: the metallic-strip conductor is specially selected to form a rectifying metal-semiconductor transition while the ground plane exhibits an ohmic metallization. Thus the cross section of SCML is similar to that of a Schottky-barrier diode. The resulting voltage-dependent capacitance per unit length causes the nonlinear behavior of such lines. In this paper a detailed analysis of the, slow-wave propagation on SCML is presented, including the effect of metallic losses. Formulas for the propagation constant and characteristic impedance are derived and an equivalent circuit is presented. Conditions for slow-mode behavior are given, particularly taking into account the influence of imperfect conductors and defining the range of many interesting applications. Experimental results performed on Si-SCML are compared with theory. View full abstract»

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  • Effect of Diode Parameters on Reflection-Type Phase Shifters (Short Papers)

    Publication Year: 1976 , Page(s): 619 - 621
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB)  

    This short paper describes effects of series inductance, shunt capacitance, and resistances associated with p-i-n diodes on the performance of reflection-type digital phase shifters using a shorted transmission line behind a shunt-mounted diode. It is found that the shunt capacitance is the most dominant reactance influencing the phase shift and it increases the phase-shift value. The series inductance reduces the phase-shift value. Expressions for phase shift in various cases are presented. View full abstract»

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  • Integrated Approach to Microwave Design

    Publication Year: 1976 , Page(s): 584 - 591
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    A new, integrated approach to microwave design is presented involving concepts such as optimal design centering, optimal design tolerancing, optimal design tuning, parasitic effects, uncertainties in models and reference planes, and mismatched terminations. The approach is of the worst case type, and previously published design schemes fall out as particular cases of the ideas presented. The mathematical and computational complexity as well as the benefits realized by our approach is illustrated by transformer examples, including a realistic stripline circuit. View full abstract»

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  • General Form of Green's Function for Multilayer Microstrip Line with Rectangular Side Walls (Letters)

    Publication Year: 1976 , Page(s): 626 - 628
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    This letter shows the general form of Green's functions for multilayer microstrip lines with rectangular side walls derived for the eight cases classified according to the boundary conditions by taking account of the reciprocity relation for Green's function and using the method of separation of variables View full abstract»

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  • A Coplanar Waveguide with Thick Metal-Coating (Short Papers)

    Publication Year: 1976 , Page(s): 604 - 608
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    A theoretical method is presented for the analysis of a coplanar waveguide, with thick metal-coating. Numerical results are given and compared with published data. It is shown that the metal-coating thickness of the coplanar waveguide causes an increase in wavelength and a decrease in characteristic impedance and that the changes are about the same as those of a slot line. View full abstract»

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  • Vector Variational Formulation of Electromagnetic Fields in Anisotropic Media

    Publication Year: 1976 , Page(s): 553 - 559
    Cited by:  Papers (61)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB)  

    Maxwell's equations can be cast into a basic differential operator equation, the curlcurl equation, which lends itself easily to variational treatment. Various forms of this equation are associated with problems of practical importance. The formulation includes the treatment of loss-free anisotropic media. The boundary conditions associated with electromagnetic-field problems are treated in detail and the uniqueness of the solution is discussed. A functional is derived for the curlcurl equation in Cartesian and cylindrical coordinates. View full abstract»

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  • Different Representations of Dyadic Green's Functions for a Rectangular Cavity

    Publication Year: 1976 , Page(s): 597 - 601
    Cited by:  Papers (40)
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    Several different but equivalent expressions of the dyadic Green's functions for a rectangular cavity have been derived. The mathematical relations between the dyadic Green's function of the vector potential type and that of the electric type are shown in detail. This work supplements the one by Morse and Feshbach. View full abstract»

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  • On the Theory of Coupling Between Finite Dielectric Resonators (Short Papers)

    Publication Year: 1976 , Page(s): 615 - 619
    Cited by:  Papers (3)
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    The coupling coefficients between open dielectric resonators in three useful dielectric-filter configurations, calculated from an electric rather than from a magnetic excitation of the fields, are given. The limitations of the latter method are pointed out and experimental results are given which supports the first method and shows that the differences cannot always be neglected. View full abstract»

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  • Analysis of a Waveguide Mounting Configuration for Electronically Tuned Transferred-Electron-Device Oscillators and its Circuit Application

    Publication Year: 1976 , Page(s): 573 - 584
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (976 KB)  

    Theoretical analysis of a waveguide-post mounting configuration employed for high electronic (varactor) tuning of a transferred-electron-device oscillator is presented. The resulting two-port-coupling network representation is also used to derive the impedance of the post structure as an obstacle to the dominant TE10 mode in the waveguide. Obstacle measurements conducted on the post structure for the incident TE10 mode are found to be in very good agreement with the theory. This network representation is then applied to a practical transferred-electron-device oscillator reported elsewhere. It has been able to successfully explain the characteristic features of the oscillator. It is observed that the main source of discrepancy between the theoretical and experimental characteristics could be attributed to a lack of knowledge of the precise values of the package parasitic elements. The nature of the theoretical varactor-tuning characteristic predicted by the model is discussed and indicated for a particular configuration. View full abstract»

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  • Effects of the Surroundings on Electromagnetic-Power Absorption in Layered-Tissue Media (Short Papers)

    Publication Year: 1976 , Page(s): 621 - 625
    Cited by:  Papers (5)
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    The influence of the surroundings on the interaction between electromagnetic (EM) waves and biological tissue is examined by schematizing the environment by a perfectly conducting screen placed beyond the irradiated tissue. The effects of standing waves, which are created in this situation, are determined as a function of the electrical and geometrical parameters of the structure. In particular, the hazard increase due to the presence of the screen combined with a phase disuniformity of the incident field--an elementary schematization of the "near-field"--is pointed out. View full abstract»

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  • Effect of the Magnetic Perturbation on Magnetostatic Surface-Wave Propagation

    Publication Year: 1976 , Page(s): 591 - 597
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    This paper discusses the propagation of the magnetostatic surface wave in two ferrite slabs (namely, YIG and Ga-YIG) with different magnetic saturations, and considers a weak coupling in between them. The theoretical results are obtained by using the conventional perturbation technique which is subsequently supported by experiment. Further, the time delay in group velocity affected by the magnetic perturbation is treated theoretically. View full abstract»

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  • Equivalent Circuit of a Narrow Axial Strip in Waveguide (Short Papers)

    Publication Year: 1976 , Page(s): 611 - 615
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    A theoretical determination is made of the two-port equivalent circuit of a narrow strip located axially in a rectangular waveguide such that it extends partially or completely across the waveguide narrow dimension. The analysis is based upon derivation of a variational expression for a field quantity from which can be determined the reflection coefficient and the equivalent-circuit parameters. Experimental input susceptance values agree closely with the theory. The analysis shows that the T-equivalent network of a nontouching strip has a series-resonant shunt circuit. This element has application in filter and impedance-transforming networks, in planar circuits, and in fin-line structures. 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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