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Microwave Theory and Techniques, IEEE Transactions on

Issue 11 • Date Nov. 1984

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Displaying Results 1 - 22 of 22
  • [Front cover - Nov. 1984 [T-MTT]]

    Page(s): f1 - f2
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    Freely Available from IEEE
  • Patent abstracts

    Page(s): 1505 - 1509
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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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  • Asian abstracts

    Page(s): 1510 - 1519
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    Freely Available from IEEE
  • IEEE Annual Combined Index [advertisement]

    Page(s): 1520
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    Freely Available from IEEE
  • IEEE Standard Dictionary of Electrical and Electronics Terms [advertisement]

    Page(s): 1521
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  • IEEE Microfilm [advertisement]

    Page(s): 1522
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    Freely Available from IEEE
  • [Back cover - Nov. 1984 [T-MTT]]

    Page(s): b1 - b2
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    Freely Available from IEEE
  • Accurate Hybrid-Mode Finline Configurations Including Analysis of Various Multilayered Dielectrics, Finite Metallization Thickness, and Substrate Holding Grooves

    Page(s): 1454 - 1460
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    An accurate analysis of various finline configurations is introduced. The method of field expansion into suitable eigenmodes used considers the effects of finite metallization thickness as well as waveguide wall grooves to fix the substrate. Especially for millimeter-wave range applications, the propagation constant of the fundamental mode is found to be lower than by neglecting the finite thickness of metallization. For increasing groove depth in cases of asymmetrical and "isolated finline," higher order mode excitation reduces the monomode bandwidth significantly. In contrast to hitherto known calculations, this parameter only causes negligible influence on a fundamental mode if the groove depth is lower than hall of the waveguide height. View full abstract»

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  • Analysis of Finline with Finite Metallization Thickness (Short Papers)

    Page(s): 1484 - 1487
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    In this paper, we present a method for analyzing finline structures with finite metallization thickness. The method is based on a hybrid mode formulation but it by-passes the lengthy process of formulating the determinantal equation for the unknown propagation constant. Some numerical results are presented to show the effect of the metallization thickness for unilateral and bilateral finlines. View full abstract»

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  • Quasi-Optical Method for Measuring the Complex Permittivity of Materials (Corrections)

    Page(s): 1504
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    In the above paper, in Column 1 of Table II on page 663, Reference [9] should read [10] and Reference [10] should read [12]. View full abstract»

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  • Even- and Odd-Mode Impedances of Coupled Elliptic Arc Strips (Short Papers)

    Page(s): 1475 - 1479
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    A derivation of the expression for even- and odd-mode impedances of coupled elliptic arc strips between grounded, confocal elliptic cylinders, and above a grounded elliptic cylinder, symmetrically located with the minor axis, is presented. The analysis is based on TEM-mode approximation. Green's function formulation is used to obtain variational expressions for the even-and odd-mode capacitances for the more general case of different dielectrics on the two sides of the coupled strips. Numerical results are presented for coupled elliptic and circular cylindrical arc strips. It is also shown that the formulation can be used to find the effect of environmental changes on an otherwise planar structure. View full abstract»

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  • An Evanescent Mode Waveguide Bandpass Filter at Q Band (Short Papers)

    Page(s): 1487 - 1489
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    Evanescent-mode filters have previously been restricted in frequency to X band or below. Here, the performance of an evanescent-mode waveguide bandpass filter with a center frequency in the 26-40-GHz band (Q band) is reported. View full abstract»

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  • The Electrostatic Field of Conducting Bodies in Multiple Dielectric Media

    Page(s): 1441 - 1448
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    A method for computing the electrostatic fields and the capacitance matrix for a multiconductor system in a multiple dielectric region is presented. The number of conductors and the number of dielectrics in this analysis are arbitrary. Some of the conductors maybe of finite volume and others may be infinitesimally thin. The conductors can be either above a single ground plane or between two parallel ground planes. The formulation is obtained by using a free-space Green's function in conjunction with total charge on the conductor-to-dielectric interfaces and polarization charge on the dielectric-to-dielectric interfaces. The solution is effected by the method of moments using triangular subdomains with piecewise constant expansion functions and point matching for testing. Computed results are given for some finite-length conducting lines, compared to previous results obtained by two-dimensional analysis. View full abstract»

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  • Regenerative Frequency Division with a GaAs FET

    Page(s): 1461 - 1468
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    The circuit concept to be described accomplishes regenerative frequency division by employing a GaAs FET which is biased near pinchoff. The concept aims at efficient utilization of basic device characteristics, providing well-behaved divider performance and easy circuit designability. This is exemplified with the help of an experimental 16-to-8-GHz divider circuit whose output response is studied for single-tone CW, RF-pulsed, and two-tone CW excitations. View full abstract»

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  • Coupled-Mode Theory of Two Nonparallel Dielectric Waveguides

    Page(s): 1469 - 1475
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    A general theory for treating the coupling between two nonparallel dielectric waveguides is developed using the coupled-mode assumption. This theory is used to analyze directional couplers consisting of two circularly curved, single-mode dielectric slab waveguides. By assuming continuous coupling between the two waveguides rather than only between adjacent segments on the two waveguides, the present theory avoids the awkwardness of having to specify in a somewhat arbitrary manner the separation between these segments, as is the case for existing theories reported in the literature. It is shown that this over-simplification results often in an overestimate of the power transfer in a directional coupler by 10-20 percent, compared to this theory. View full abstract»

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  • A Generalized Formulation of Electromagnetically Coupled Striplines

    Page(s): 1427 - 1433
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    This paper presents a method of derivation of general expression for coupling which can he applied to coplanar as well as noncoplanar strips of equal and unequal widths arbitrarily located between ground planes and filled with layered substrate. Assuming TEM-mode propagation, the couping coefficient is determined in terms of self and mutual inductances. The method of derivation of these circuit parameters is also presented. The expressions for the fields required for analysis are obtained from Green's function formulation. Comparison of the numerical data with those obtained by other methods is presented. View full abstract»

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  • Extension of Levy's Large-Aperture Design Formulas to the Design of Circular Irises in Coupled-Resonator Waveguide Filters (Short Papers)

    Page(s): 1489 - 1493
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    This paper extends some results for waveguide irises to obtain accurate design formulas for the design of circular waveguide irises in coupled-resonator rectangular waveguide filters. Experimental results confirm the improved accuracy of the new design formulas. The new approach has been successfully applied to the design of a 12-GHz waveguide filter in WR90 waveguide for satellite transponder studies. Improved accuracy in the iris design enabled the filter to meet stringent group delay specifications. View full abstract»

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  • Waveguide Modes Via an Integral Equation Leading to a Linear Matrix Eigenvalue Problem

    Page(s): 1495 - 1504
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    A numerical method for determining the modes of a rectanguIar or a circular waveguide strongly perturbed by axial cylindrical conducting objects is presented. The method is based upon an integral equation which leads to a matrix eigenvalue problem by using the Galerkin procedure. Cutoff wavenumbers are simultaneously calculated with very good precision for a number of modes near to the order of the matrix eigenvalue problem. Excellent results are obtained also when the perturbed waveguide section exhibits reentrant parts or edges. Computing time is short and storage requirements are moderate. The method is also applicable for waveguides of arbitrary cross section. View full abstract»

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  • A True Elliptic-Function Filter Using Triple-Mode Degenerate Cavities

    Page(s): 1449 - 1454
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    A six-pole triple-mode filter capable of a true elliptic-function response has been synthesized and experimentally realized. This was achieved by using a new intercavity iris structure that can control three intercavity-mode couplings simultaneously. View full abstract»

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  • Computer-Optimized Multisection Transformers Between Rectangular Waveguides of Adjacent Frequency Bands (Short Papers)

    Page(s): 1479 - 1484
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    Design data are given for multisection double-plane step transformers between X- (8.2-12.4 GHz), Ku- (12.4.-18 GHz), K- (18-26.5 GHz), and Ka- (26.5-40 GHz) band waveguides. The calculations, based on a field expansion into orthogonal eigenmodes, take into account the influence of higher order modes. For frequency ranges other than the bands given, simple scaling formulas based on the optimized data yield transformer designs with sufficiently low VSWR. Optimum short transformers are possible if the total transformer length is included within the error function to be optimized. Measurements agree with theory. View full abstract»

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  • Amplification by Interdigital Excitation of Space-Charge Waves in Semiconductors

    Page(s): 1434 - 1441
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    A new concept of amplification of the electromagnetic (EM) wave as a consequence of its interaction with a space-charge wave in a semiconductor is analyzed. The EM wave is applied to an interdigital line which in turn excites a space-charge wave in a high-resistivity silicon. The theoretical calculations are carried out by means of the least-square boundary residual method, where a theoretical gain of 84 dB is obtained at synchronism of the third harmonic of the wave. The experimental device exhibits a net gain of 13 dB at synchronism. The mobility of the carriers in the semiconductor is deduced out of the experimental results. View full abstract»

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  • A Technique to Identify Electromagnetic Modes in Oversize Waveguides (Short Papers)

    Page(s): 1493 - 1495
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    There are problems associated with the multimode character of oversize waveguides. This paper reports on a novel, direct way to identify modes in an oversize waveguide by looking at the field map on a liquid crystal sheet inserted in the waveguide. The local temperature change in the liquid crystal due to absorbed microwave energy is translated to a color change in such a way that a map of the Iocal power flow is observed on the sheet. Mode identification is very important in gyrotrons, for example, where the microwave energy generating device is subject to severe problems from mode competition. 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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