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IEEE Transactions on Microwave Theory and Techniques

Issue 7 • Date Jul 1987

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Displaying Results 1 - 14 of 14
  • [Front cover - Jul. 1987 [T-MTT]]

    Publication Year: 1987, Page(s):f1 - f2
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    Freely Available from IEEE
  • Patent abstracts

    Publication Year: 1987, Page(s):676 - 679
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (301 KB)

    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 - Jul. 1987 [T-MTT]]

    Publication Year: 1987, Page(s):b1 - b2
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    Freely Available from IEEE
  • Analysis of Nonreciprocal Coupled Image Lines

    Publication Year: 1987, Page(s):629 - 635
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The effective dielectric constant method is used to analyze the nonreciprocal coupling properties of coupled image lines separated by a Iongitudinally magnetized ferrite slab. Two structures are considered, one incorporating low-dielectric-constant image lines (epsilonr = 2.56), the other incorporating image lines consisting of high-dielectric-constant material (epsilonr = 9.... View full abstract»

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  • Characteristics of Metallic Waveguides Inhomogeneously Filled with Dielectric Materials with Surface Plasma Layers

    Publication Year: 1987, Page(s):609 - 614
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The propagation of millimeter waves in metallic waveguides inhomogeneously filled with dielectric materials having surface plasma layers is characterized. The modal phase shift and attenuation of a 94-GHz wave are computed for a 10-µm plasma layer thickness as a function of carrier density. In the unexcited state, 90 percent of the millimeter-wave power is confined to the interior air region ... View full abstract»

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  • Design of Broad-Band Dielectric Waveguide 3-dB Couplers

    Publication Year: 1987, Page(s):621 - 628
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    It is shown how 3-dB couplers with bandwidths on the order of 30 percent can be designed by appropriately taking advantage of the dispersion and the frequency dependence of coupling per unit length between two dielectic waveguides with asymmetrical cross sections. Theoretical methods for computing frequency responses of such couplers are discussed. It is shown how the phase response can be simply ... View full abstract»

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  • MMIC 14-GHz VCO and Miller Frequency Divider for Low-Noise Local Oscillators

    Publication Year: 1987, Page(s):657 - 662
    Cited by:  Papers (17)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    An MMIC voltage-controlled oscillator and an MMIC frequency divider are developed and applied to a 14-GHz low-noise local oscillator. To obtain both wide tuning range and low pulling figure, the source-follower FET circuit is used in the voltage-controlled oscillator. A wide-band balanced mixer and a filtering amplifier are integrated in a single chip and constitute the Miller frequency divider. -... View full abstract»

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  • Two Methods for the Measurement of Substrate Dielectric Constant

    Publication Year: 1987, Page(s):636 - 642
    Cited by:  Papers (51)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Two methods for the accurate and convenient measurement of the dielectric constant of a microwave substrate are proposed. Both methods use the precision measurement capability of the HP-8510 Network Analyzer system and a rigorous theoretical analysis of multilayer transmission lines [6], and hence can also be used for the measurement of the frequency dependence of the relative dielectric constant.... View full abstract»

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  • Characteristic Impedance and Effective Permittivity of Modified Microstrip Line for High Power Transmission

    Publication Year: 1987, Page(s):615 - 620
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    In a quasi-TEM approximation, the calculation of the characteristic impedance and effective permittivity of a modified microstrip line with the upper strip conductor edges turned up from the substrateis presented. Both these theoretically derived quantities are compared with experimental values. To further facilitate the analysis and synthesis of the modified microstrip line, closed-form approxima... View full abstract»

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  • An Investigation of Parametric Noise in Millimeter-Wave IMPATT Oscillators

    Publication Year: 1987, Page(s):663 - 671
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    The IMPATT oscillator used as an LO source in a receiver has often been found to contribute a large amount of excess noise to the system (sometimes more than 40 dB compared to a klystron). Often the IMPATT noise has been referred to as avalanche noise, but theoretically this should only reduce the carrier-to-noise ratio by 10-15 dB when compared to a klystron. In the following paper, we show that ... View full abstract»

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  • Analysis and Design of MESFET Gate Mixers

    Publication Year: 1987, Page(s):643 - 652
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    A general and efficient nonlinear/linear analysis of MESFET gate mixers is presented. In the nonlinear analysis, the Newton-Raphson algorithm is used in conjunction with a novel approach for computing partial derivatives required by the Jacobian.The study of conversion gain and stability characteristics of the mixer is based on S-parameter matrix theory. As a result of the analysis, the possibilit... View full abstract»

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  • Spectral-Domain Analysis of Single and Coupled Cylindrical Striplines (Short Papers)

    Publication Year: 1987, Page(s):672 - 675
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A spectral-domain technique for finding the characteristic impedances of a single cylindrical stripline and a coupled pair of cylindrical striplines is presented. Assuming a charge distribution on the strip, the variational expression for the line capacitance for single cylindrical strip-Iine is derived. Good agreement with published results is obtained. The cylindrical coupled strip and microstri... View full abstract»

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  • Thermal Lowering of the Threshold for Microwave Breakdown in Air-Filled Waveguides

    Publication Year: 1987, Page(s):653 - 656
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    It is demonstrated that the presence of absorbing inhomogeneities in an air-filled microwave waveguide may significantly lower the threshold for microwave breakdown. The underlying physical mechanism is locally enhanced microwave absorption and subsequent heating of the waveguide air. The results provide an explanation of the fact that break-down thresholds of microwave transmission systems are ob... View full abstract»

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  • Getting the Picture (Jul. 1987 [T-MTT])

    Publication Year: 1987, Page(s): 680
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    First Page of the Article
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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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