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Microwave Theory and Techniques, IEEE Transactions on

Issue 9 • Date Sep. 1981

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Displaying Results 1 - 25 of 26
  • [Front cover - Sep. 1981]

    Page(s): f1 - f2
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    Freely Available from IEEE
  • Guidance and Leakage Properties of a Class of Open Dielectric Waveguides: Part I - Mathematical Formulations

    Page(s): 843 - 855
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    A class of open dielectric waveguides is discussed which is of direct importance to the areas of integrated optics and millimeter-wave integrated circuits. An accurate analysis of the properties of these waveguides reveals that interesting new physical phenomena, snch as leakage and sharp cancellation or resonance effects, may occur under appropriate circumstances. The resulting leaky modes form a new class of such modes since the leakage, in the form of an exiting surface wave, has a polarization opposite to that which dominates in the bound portion of the leaky mode. These new effects are caused by TE-TM mode coupling, which was neglected in earlier approximate treatments. Part I presents the mathematical formulation based on a rigorous mode-matching procedure. View full abstract»

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  • Guidance and Leakage Properties of a Class of Open Dielectric Waveguides: Part II - New Physical Effects

    Page(s): 855 - 869
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    A class of open dielectric waveguides is discussed which is of direct importance to the areas of integrated optics and millimeter-wave integrated circuits. An accurate analysis of the properties of these waveguides reveals that interesting new physical phenomena, such as leakage and sharp cancellation or resonance effects, may occur under appropriate circumstances. The resulting leaky modes form a new class of such modes since the leakage, in the form of an exiting surface wave, has a polarization opposite to that which dominates in the bound portion of the leaky mode. These new effects are caused by TE-TM mode coupling, which was neglected in earlier approximate treatments. Part II describes the new physical effects and includes numerical results on various waveguiding structures to illustrate the new effects quantitatively. View full abstract»

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  • Patent abstracts

    Page(s): 990 - 996
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    These patent abstracts of recently issued patents of interest to microwave engineers are intended to provide the minimum information necessary for readers to detennine if they are interested in examining the patent in more detail. Complete copies of patents are available for a small fee by writing: U.S. Patent and Trademark Office, Box 9, Washington, DC, USA. View full abstract»

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  • [Back Cover - Sep. 1981]

    Page(s): b1
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    Freely Available from IEEE
  • Anomalous Low-Loss Transmission in a Gas-Confined Dielectric Waveguide for Millimeter and Submillimeter Wavelengths

    Page(s): 983 - 987
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    A novel low-loss (gas-confined) dielectric waveguide for millimeter and submillimeter wavelengths was previously reported by the author. The waveguide consists of a thin dielectric tube separating an internal high-dielectric-constant gas from an external low-dielectric-constant gas. The attenuation constant of this form of waveguide usually increases with increasing tube thickness. The thick tube is indispensable for a mechanically stable waveguide. In this paper, anomalous low-loss transmission characteristics in a gas-confined dielectric waveguide with a thick tube are described. Some condtions are theoretically found where the attenuation constant of the waveguide with a thick tube is extremely low, due to tight field confinement within the internal gas. A qualitative explanation of the operation mechanism is also given. View full abstract»

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  • Composite Dielectric Waveguides with Two Elliptic-Cylinder Boundaries

    Page(s): 987 - 990
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    It is shown that the propagation constants of composite dielectric waveguides with two different elliptic-cylinder boundaries, such as the recent single-polarization optical fibers, are computable by the point-matching method. Numerical results are shown for various combinations of the dielectric constants. View full abstract»

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  • A Quasioptical Circuit Technology for Shorttillimeter-Wavelength Multiplexer

    Page(s): 897 - 905
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    This paper describes constructions and electrical performances of shortmillimeter-wavelength quasioptical passive circuits using the Gaussian beam mode, i.e., beam mode Iaunchers, polarization-independent beam splitters, circular polarization duplexers, filters, diplexers, and multiplexer. The diplexers were devised to handle wide bandwidths with fairly low loss and to have a sharp cutoff response so that they can be applied to telecommunications systems. Experiments on these components including frequency multiplexers and antenna feed systems were carried out in the 100-GHz band. It is shown that quasioptical circuits are particular useful in reducing insertion loss of multiplexing systems for shortmillimeter wavelengths. View full abstract»

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  • Aperture Coupling Between Dielectric Image Lines

    Page(s): 891 - 896
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    Aperture coupling between dielectric image lines is used develop a design technique for directional couplers at millimeter-wave frequencies. Expressions for coupling coefficients and directivity, employing coupling between image lines through apertures in the common ground plane are developed. The design procedure is illustrated by application 10-, 20-, and 30-dB directional couplers in rectangular image lines with circular aperture coupling. View full abstract»

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  • Method of Analysis of Planar Networks Including Radiation Loss

    Page(s): 942 - 948
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    A general approach to the analysis of microwave planar structures, specifically intended to account for radiation loss is presented. By expanding the internal electromagnetic (EM) field in terms of resonant modes, also the external field is obtained in the form of a series, each term of which corresponds to the field radiated by a resonant mode excited in the structure. Neglecting the effect of the thin dielectric substrate on the power radiated and the coupling between the modes, occurring at the lateral surface of the structure, a simplified formulation is obtained which is shown to be in very good agreement with experiments, performed in the frequency range 2-12.4 GHz, which could not be explained on the basis of a Iossless model. View full abstract»

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  • Circularly Polarized Linear Array Antenna Using a Dielectric Image Line

    Page(s): 967 - 970
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    A new circularly polarized antenna using a dielectric image line is proposed. This antenna is composed of a slotted conductive plane and a rectangular dielectric rod. This paper describes the design of and experimental results achieved with the circularly polarized array antenna fed by a dielectric image line. The fundemental characteristics of the image line are also presented. Since this line's losses are far lower than the microstrip line losses in the millimeter wavebands, antenna feed line losses expect to be also very low. Bandwidth within the 2-dB axial ratio was more than 7 percent, and the angle range within the same ratio was more than +-7.8 degrees at 29.5 GHz. This antenna is far superior to the microstrip line feed array antenna in the millimeter wavebands. View full abstract»

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  • Analysis of Periodic Ferrite Slab Waveguides by Means of Improved Perturbation Method

    Page(s): 911 - 916
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    Periodic ferrite slab waveguides are analyzed by means of an improved perturbation method, and nonreciprocal leakage phenomena are shown theoretically. As an application of these phenomena, new planar isolators and circulators are proposed. Numerical examples are also provided. View full abstract»

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  • Analysis of Single and Coupled Rectangular Dielectric Waveguides

    Page(s): 870 - 874
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    Single and coupled rectangular dielectric waveguides are analyzed by means of the mode-matching technique. Dispersion characteristics are given for dominant modes of the inverted stripline and rib waveguides. The propagation constant for Ey11-mode of the inverted strip line is found to become less than the lowest limit for guidance above a certain frequency. Influence of frequency and dielectric constant of the rib on the normalized coupling length of two coupled rib waveguides is investigated. View full abstract»

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  • Asymptotic Eigenequations and Analytic Formulas for the Dispersion Characteristics of Open Wide Microstrip Lines

    Page(s): 933 - 941
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    Through the matched asymptotic expansions technique, asymptotic eigenequations for the even and odd modes of an open wide microstrip transmission line are derived. The eigenequations, and simplifications thereof which do not involve integration, can he solved easily for the effective permittivity. Even though d/W is assumed to be small, the solutions are good even if d/ W≅0.8 when compared with the numerical results of Jansen. From these eigenequations, asymptotic formulas for the effective permittivity can be derived which are excellent when d/ W≅0.2. When the frequency goes to zero, we reproduced the asymptotic formula derived under the quasi-TEM approximation in [8]. The asymptotic analysis provides good physical insight into the problem, otherwise unavailable from numerical analysis. View full abstract»

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  • Coupling Characteristics of Planar Dielectric Waveguides of Rectangular Cross Section

    Page(s): 875 - 880
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    An approximate analytical method based on experimental results for predicting the coupling characteristics of various coupling structures is described. Expressions for the propagation constants were derived using the generalized effective dielectric constant method. For nonsymmetric coupling structures, the theoretical coupling coefficients were modified by a correction factor. Comparisons between experimental and theoretical results are presented. View full abstract»

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  • A Generalized Two-Dimensional Coupled-Mode Analysis of Curved and Chirped Periodic Structures in Open Dielectric Waveguides

    Page(s): 881 - 891
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    A generalized two-dimensional coupled mode analysis of curved and chirped quasi-periodic structures in planar dielectric waveguides has been formulated. This analysis can be used to design curved and chirped quasi-periodic stuctures for obtaining phase matched interaction between two specific guided-wave beams. Alternatively, it can be used to calculate the amplitude and the phase of the diffracted guided-wave beam for a given quasi-periodic structure and for a specific incident beam, including the effect of the phase mismatch. The numerical example of linear chirped grating lenses with F= 10, f= 20 mm, Lambdamin = 2mu m, Lambdamax = 4.1mu m, and grating grooved length= 65mu m is presented. View full abstract»

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  • Metal Walls in Close Proximity to a Dielectric Waveguide Antenna

    Page(s): 962 - 966
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    The effect of placing metal walls in close proximity to a dielectric antenna has been examined theoretically. When these walls are less than one millimeter away from a silicon dielectric waveguide operating nominally at 60 GHz, they affect the wavelength of the electromagnetic radiation within the guide. As the guide wavelength changes, the angle of radiated energy emanating from the metal stripe perturbations on the upper surface of the dielectric guide also changes. A line scanning antenna can be realized by varying the change in guide wavelength in a controlled manner. Theoretical calculations were made to determine the physical parameters such as waveguide size, spacing of metal stripe perturbations and location of metal walls with respect to the silicon waveguide which can produce a large angular scan. Design curves are presented which can be used to examine tradeoffs between the initial radiation angle and range of angular scan as a function of frequency and perturbation spacing. A means of electronically controlling the simulated absence or presence of metal walls by current biasing distributed p-i-n diodes attached to the side of the dielectric guide from a nonconducting state into a high conductivity state is discussed. View full abstract»

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  • Irregular Magneto-Optical Waveguides

    Page(s): 906 - 910
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    The theory of wave propagation along irregolar anisotropic guides (fibers) is discussed in brief. The problem in question is considered by spectral expansion, which is constructed, in turn, with the help of the scattering operator of conical waves. The general relations are illustrated by example of a round gyrotropic waveguide of a small cross section. View full abstract»

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  • A Hybrid Method for Paraxial Beam Propagation in Multimode Optical Waveguides

    Page(s): 923 - 933
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    A hybrid (nonray, nonmodal) method for computing the fields of a paraxial beam propagating in a multimode waveguide (parallel-plate or dielectric slab) at large axial distances is presented. The method is based on the Fourier and Fresnel self-imaging properties of these waveguides, and is capable of high accuracy. The method is much more efficient than ray or mode approaches, while giving complete field information which coupled-power equations do not provide. View full abstract»

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  • Foreword, Sep. 1981

    Page(s): 841 - 842
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    Electromagnetic wave guiding and transmission are an integral part of microwave, rnillimeter-wave, and optical systems. Passive components can be made with particular waveguide or transmission-line configurations and active components can be realized by installing solid-state devices in them. To design passive and active components, characteristics of related waveguiding structures must be clearly understood. View full abstract»

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  • Millimeter-Wave InP Image Line Self-Mixing Gunn Oscillator

    Page(s): 958 - 961
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    Indium Phosphide Gunn Diodes have been used to develop self -mixing oscillators in the 60-GHz region using dielectric image line techniques. Experiments have been performed to measure conversion characteristics and minimum detectable signal. Applications are suggested based on minimum detectable signal for systems requiring small size and low cost. View full abstract»

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  • Microwave Modeling of Optical Periodic Waveguides

    Page(s): 979 - 983
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    A design procedure and experimental method is presented for modeling optical periodic waveguides by means of more convenient parallel plate microwave configurations. These models are suitable for verifying the beam-coupling properties of dielectric gratings that operate in the fundamental TE0 surface-wave mode. In particular, blazed gratings with high coupling efficiencies have been constructed and their characteristics have been measured. The results have shown that previously developed design criteria, which are based on a simple Bragg-scattering approach, can yield highly efficient broad-band beam couplers that are not subject to critical fabrication tolerances. View full abstract»

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  • Millimeter-Wave Dielectric Image Line Detector-Circuit Employing Etched Slot Structure

    Page(s): 953 - 957
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    In an earlier paper [1] slots in the ground plane are investigated as new circuit elements in dielectric image lines. In this paper slots in dielectric image lines employing metallized dielectric substrates as the ground plane are investigated. It is shown that this configuration can be used to realize truly integrated dielectric image line semiconductor circuits. As an example the design and performance of a detector circuit for 26 to 40 GHz is presented. View full abstract»

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  • A Periodic Branching Filter for Millimeter-Wave Integrated Circuits

    Page(s): 971 - 978
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    A number of passive and active devices using dielectric waveguides have been developed and find various applications in integrated circuits at the millimeter optical-frequency range. The design, theoretical considerations and experimental findings of a periodic branching filter using rectangular dielectric waveguides are described in this paper. Low insertion loss for the periodic branching filter with 850-MHz 3-dB bandwidth, less than 1.0 dB, is achieved in the frequency range from 77 to 85 GHz. Measured results are in good agreement with theoretical calculations. View full abstract»

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  • Millimeter-Wave Passive Components and Six-Port Network Analyzer in Dielectric Waveguide

    Page(s): 948 - 953
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    A cost effective scheme of fabricating millimeter-wave passive components in dielectric waveguide has been conceived and a computer program has been written for analyzing their frequency responses. By inlaying Teflon guides in the properly designed contours cut in a low dielectric constant foam material, passive components such as quadrature hybrids, in-phase power dividers, and six-port network analyzers have been developed. Design and performance data are presented. 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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