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IEEE Transactions on Microwave Theory and Techniques

Issue 6  Part 1 • Date Jun 1989

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Displaying Results 1 - 17 of 17
  • New type of spectral-domain analysis of a microstrip-line

    Publication Year: 1989, Page(s):947 - 952
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The problem of an open microstrip line is analyzed by the spectral-domain method combined with the sampling theorem. In the spectral domain, the boundary conditions of zero tangential electric fields are expressed in terms of the convolution integral forms with a sampling function, and these relations are discretized by the method of moments with the spherical Bessel function as a weighting functi... View full abstract»

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  • Waveguide discontinuity analysis with a coupled finite-boundary element method

    Publication Year: 1989, Page(s):993 - 998
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    A numerical method for the analysis of waveguide discontinuities is proposed. The approach is based on the coupling of the finite-element and boundary-element methods. The respective merits of these methods are extracted to yield a much faster solution and to enhance computation efficiency. A general procedure is described using quadratic elements approximation, and the validity and efficiency of ... View full abstract»

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  • Mutual impedance between probes in a circular waveguide

    Publication Year: 1989, Page(s):1006 - 1012
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The general formulas of mutual impedance between two probes arbitrarily located in a circular waveguide are derived by a dyadic Green's function (DGF) and reaction concept. The waveguide is semi-infinite. The reflection coefficient at the terminal plan is Γ. The lengths, feeding points and orientations of the two probes in the waveguide are all arbitrary. As examples, expressions of mutual i... View full abstract»

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  • Nonreciprocal operation of structures comprising a section of coupled ferrite lines with longitudinal magnetization

    Publication Year: 1989, Page(s):1012 - 1020
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Nonreciprocal devices based on a section of two coupled lines containing ferrite magnetized in the propagation direction are investigated. The necessary conditions for nonreciprocal operation are derived. Several configurations are proposed and their scattering matrices are given. An explanation of the action of experimental devices constructed by other researchers is proposed and substantiated by... View full abstract»

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  • Bandwidth characteristics of inhomogeneous T-septum waveguides

    Publication Year: 1989, Page(s):1021 - 1026
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Rectangular waveguides with T-shaped septa were recently shown to have superior characteristics compared to conventional ridged guides. Here, the dispersion equations of the hybrid modes of an inhomogeneously filled septum guide are determined by the Ritz-Galerkin technique. Results of numerical computations indicate that with dielectric filling of the septum gap, further enhancement of the cutoff... View full abstract»

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  • TM waves guided by nonlinear planar waveguides

    Publication Year: 1989, Page(s):941 - 946
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    A numerical method is given for calculating the dispersion relations and field distributions of stationary, nonlinear transverse magnetic (TM) waves guided by optical planar waveguides with intensity-dependent permittivities. The method can treat arbitrary linear permittivity profiles and arbitrary types of the nonlinearity, since it is based on a numerical integration of the nonlinear wave equati... View full abstract»

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  • Synthesis, design, and construction of ultra-wide-band nonuniform quadrature directional couplers in inhomogeneous media

    Publication Year: 1989, Page(s):969 - 976
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    A computer-aided synthesis design procedure is given for nonuniform quadrature directional couplers in inhomogeneous media. A wiggly geometry is used which effectively slows the odd-mode phase velocity to match the even-mode phase velocity. The wiggly geometry results in improved isolation and increased effective dielectric constant. This technique provides a shorter coupler length due to increase... View full abstract»

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  • Microwave complex conductivity of a square post in rectangular waveguide

    Publication Year: 1989, Page(s):984 - 992
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    A simple measurement technique for the complex conductivity of a square lossy dielectric post loaded in a rectangular waveguide is described. The technique is based on a solution of the reflection coefficient for the incident electric field of the TE10 mode. The reflection coefficient can be expressed by a simple formula for the electric fields scattered from the post. Values of complex... View full abstract»

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  • Two cylindrical obstacles in a rectangular waveguide-resonances and filter applications

    Publication Year: 1989, Page(s):962 - 968
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Two metallic or lossy dielectric cylinders placed in one cross section of a rectangular waveguide are investigated by the orthogonal expansion method. Resonances are shown by frequency responses of the transmission coefficient. They are discussed by patterns of the magnetic field and diagrams of the Poynting vector. Physical explanations of the resonances are given. The structure may be used as a ... View full abstract»

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  • Traveling-wave inverted-gate field-effect transistors: concept, analysis, and potential

    Publication Year: 1989, Page(s):1027 - 1032
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A unified approach to the analysis of the traveling-wave inverted-gate FET (INGFET) is presented. The equivalent circuit parameters of the GaAs inverted-gate FET, with submicrometer gate length, are obtained using a two-dimensional computer model which takes into account the nonstationary electron dynamics. The parameters of the passive transmission line, corresponding to the INGFET structure, are... View full abstract»

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  • FET up-converter design using load-dependent mixing transconductance

    Publication Year: 1989, Page(s):1033 - 1039
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    A method for a more accurate prediction of FET up-converter gain is proposed. The method uses an equivalent circuit containing a conversion current source at the upper and lower sideband output frequency. The magnitude of the current is related to the IF input voltage by the mixing transconductance factor that is a function of internal LO voltages in the FET. These voltages depend on the output lo... View full abstract»

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  • A proposed microwave and millimeter-wave spectrum analyzer

    Publication Year: 1989, Page(s):1054 - 1057
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The system that performs real-time spectrum analysis of large-bandwidth radio-frequency signals is proposed. The apparatus allows the simultaneous monitoring of all frequencies within the band of interest, and operates in the presence of multiple frequencies. The approach also overcomes the slowness and ambiguity of scanning methods View full abstract»

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  • Modeling of arbitrarily shaped signal lines and discontinuities

    Publication Year: 1989, Page(s):1057 - 1060
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The propagation characteristics of signal lines and discontinuities embedded in a homogeneous medium, having any shape composed of steps along the Cartesian coordinates, are obtained through an extension of the author's previous work (1986) on scattering from periodic apertures. The approach is specifically applied to high-performance computer packages, where previously used capacitance and induct... View full abstract»

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  • Computation of complex resonance frequencies of isolated composite objects

    Publication Year: 1989, Page(s):953 - 961
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    A technique based on the null-field method is presented to investigate the resonance frequencies and the quality factors of isolated composite dielectric/ferrite resonators. A method of identifying the resonant modes is suggested for nonspherical resonators by analyzing the peaks of their scattering sections in the resonance frequency range. Computed resonance frequencies and quality factors for c... View full abstract»

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  • Selected technology summaries for microwave theory and techniques-1988

    Publication Year: 1989, Page(s):1040 - 1053
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1460 KB)

    Technical advances during the years 1984-8 in nine technical areas of interest to the microwave community are summarized. These areas are: computer-aided design, acoustics, lightwaves, integrated circuits, network theory, packaging, ferrites, systems, and superconductivity View full abstract»

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  • An approximate variational solution to the step discontinuity in finline

    Publication Year: 1989, Page(s):977 - 983
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The variational method is applied to a step discontinuity in unilateral finline on the basis of a simplified description of the finite modes, as modes of a symmetrical finned waveguide. A prudent choice of the trial field in the electric and the magnetic formulations allows the derivation of economical simple equivalent circuits with frequency-independent elements over a full waveguide band for a ... View full abstract»

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  • Finite element solution of longitudinally magnetized elliptical gyromagnetic waveguides

    Publication Year: 1989, Page(s):999 - 1005
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The classic method used to derive a functional is to construct a quadratic form by premultiplying the wave equation by the conjugate field and then integrating this quantity over the cross section of the problem region. This procedure is utilized to construct a solution of the longitudinally magnetized gyromagnetic problem using the z-directed coupled wave equations. It is used in conjunc... 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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