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IEEE Transactions on Microwave Theory and Techniques

Issue 5 • May 1988

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Displaying Results 1 - 13 of 13
  • Mode stability of radiation-coupled interinjection-locked oscillators for integrated phased arrays

    Publication Year: 1988, Page(s):921 - 924
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    An analysis is presented of a two-element, 10-GHz array consisting of two oscillators coupled solely by means of the free-space interaction between their respective antenna elements. The oscillators are modeled as energy-storing L-C tank circuits in parallel with voltage-dependent negative conductances. A simplified far-field slot antenna model is used to derive the mutual admitt... View full abstract»

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  • Characteristic impedance of a coaxial system consisting of circular and noncircular conductors

    Publication Year: 1988, Page(s):917 - 921
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Two types of equivalent eccentric coaxial lines are described whose eccentricities vary with the ratio of inner and outer conductors, for a coaxial system consisting of circular and noncircular conductors. The equivalent lines can provide a smooth transition between extremes of a small wire and a wire near contact. The results obtained are simple analytical expressions for fast computation of the ... View full abstract»

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  • Comparison of power deposition by in-phase 433 MHz and phase-modulated 915 MHz interstitial antenna array hyperthermia systems

    Publication Year: 1988, Page(s):908 - 916
    Cited by:  Papers (14)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    The interstitial microwave antenna array hyperthermia (IMAAH) system produces a pattern of specific absorption rate (SAR) that is nonuniform within a 2-cm square array when driven in phase at 915 MHz. It was found that phase modulation makes the time-averaged SAR pattern significantly more uniform in planes perpendicular to the antennas. To drive antennas in phase at 433 MHz similarly improves SAR... View full abstract»

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  • Oscillator priming and preoscillation noise in a gyrotron

    Publication Year: 1988, Page(s):891 - 901
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    Phase control is achieved in a pulsed gyrotron oscillator both by applying an external priming signal directly to the oscillator and by applying the signal to a prebunching cavity. A pulse-to-pulse phase jitter of greater than 2.5° is achieved in the gyrotron at drive-to-oscillator power ratios of -36.6 dB (drive signal-to-noise power ratio of 36 dB) in the direct injection case and -71 dB (dr... View full abstract»

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  • Heinrich Hertz-theorist and experimenter

    Publication Year: 1988, Page(s):824 - 829
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    It is argued that when Heinrich Hertz was appointed professor of physics at Karlsruhe in 1885 he was uniquely prepared for his historic experiments that opened the radio spectrum. Hertz made the first antennas and transmitter-receiver radio system and conducted a series of experiments which establish that radio waves are identical to light except for their much greater length. His description of t... View full abstract»

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  • Green's function for layered lossy media with special application to microstrip antennas

    Publication Year: 1988, Page(s):875 - 881
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Suitable Green's dyadics are determined for the fields generated by a surface current density in a plane parallel to the interface of a layered isotropic structure. Special care is taken to ensure that Green's function can still be calculated in the source region by circumventing the numerical problems using analytical procedures. The obtained Green's function is used to calculate the power deposi... View full abstract»

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  • Millimeter-wave diode-grid phase shifters

    Publication Year: 1988, Page(s):902 - 907
    Cited by:  Papers (65)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    Monolithic diode grids have been fabricated on 2-cm square gallium-arsenide wafers with 1600 Schottky-barrier varactor diodes. Shorted diodes are detected with a liquid-crystal technique, and the bad diodes are removed with an ultrasonic probe. A small-aperture reflectometer that uses wavefront division interference was developed to measure the reflection coefficient of the grids. A Phase shift of... View full abstract»

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  • Heinrich Hertz: a short life

    Publication Year: 1988, Page(s):802 - 805
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The author presents a biography of Heinrich Rudolf Hertz (1857-94). After brief mention of Hertz's childhood, his education and papers on electrical theory are reviewed. Investigations conducted on electromagnetic wave propagation phenomena are recounted View full abstract»

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  • The first century of microwaves-1886 to 1986

    Publication Year: 1988, Page(s):830 - 858
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3948 KB)

    The author reviews the first century of experiments into microwaves, which he considers began with the experiments of Heinrich Hertz, between 1886 and 1889, using what are now called microwave circuits and techniques. Hertz's thorough investigations validated the Faraday-Maxwell theory of electromagnetism, opened up the electromagnetic spectrum between DC and light for scientific and practical use... View full abstract»

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  • Flexible dielectric waveguides with powder cores

    Publication Year: 1988, Page(s):882 - 890
    Cited by:  Papers (16)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    Flexible dielectric waveguides have been demonstrated at 10 GHz and 94 GHz using thin-wall polymer tubing filled with low-loss, high-dielectric-constant powders. Absorptive losses of the order of 10 dB/m were measured at 94 GHz. with nickel-aluminium titanate and barium tetratitanate powder in polytetrafluoroethylene (PTFE) lightweight electrical tubing. Bending losses at 94 GHz were negligible fo... View full abstract»

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  • The history of electromagnetics as Hertz would have known it

    Publication Year: 1988, Page(s):806 - 823
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1728 KB)

    Highlights of the separate developments of the sciences of electrostatics and magnetostatics are traced through the end of the 18th century, climaxed by the work of Coulomb and Poisson. The linkage of these two sciences due to the discoveries of Oersted, Ampere, Biot and Savart, and Faraday are described, followed by the theoretical culmination embodied in the work of Maxwell. It is shown how Maxw... View full abstract»

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  • A new six-port microwave network; six-port magic junction

    Publication Year: 1988, Page(s):859 - 864
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    A six-port junction is proposed that consists of an H-plane symmetrical waveguide Y-junction with a coaxial line on one side of its axis and a circular waveguide on its other. The scattering matrix of the junction in an ideal case is derived using the symmetry properties of the structure. If both the coaxial and the circular waveguide arm are matched without destroying the symmetry, the a... View full abstract»

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  • Complex modes in boxed microstrip

    Publication Year: 1988, Page(s):865 - 874
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    A method is described for obtaining the propagation coefficients and field patterns of a large number of modes for microstrip with a minimum of computational effort. The method uses a discrete space-domain formulation to calculate a large number of higher-order modes in a way which leads to their fast location and which ensures that node modes are missed. This includes those pairs of modes with co... 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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