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Microwave Theory and Techniques, IEEE Transactions on

Issue 10 • Date October 1967

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  • Table of contents - October 1967

    Publication Year: 1967 , Page(s): 537
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  • A Design Technique for Realizing a Microwave Tunnel-Diode Amplifier in Stripline

    Publication Year: 1967 , Page(s): 554 - 561
    Cited by:  Papers (1)
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    A significant problem in realizing a practical tunnel-diode amplifier is that of stabilizing the amplifier both within and outside its passband while maintaining a specified center-frequency gain and bandwidth. A new technique for realizing a moderate-bandwidth tunnel-diode amplifier that utilizes a directional filter as a bandpass structure is described. This technique was investigated analytically and an experimental S-band amplifier was built and tested. This experimental amplifier had typically the following characteristics: bandwidth, 400 MHz; center frequency, 2.9 GHz; and center-frequency gain, 12.5 dB. The technique described yields an amplitler which is reproducible and which has an analytically predictable and well-defined response. None of the experimental models have shown any tendencies toward oscillation. View full abstract»

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  • An Adjustable Narrow Band Microwave Delay Equalizer

    Publication Year: 1967 , Page(s): 566 - 574
    Cited by:  Papers (9)
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    A simple low loss microwave delay equalizer for the delay equalization of narrow band microwave bandpass filters has been explored. This equalizer is quite small and does not require the use of additional components such as circulators or hybrids. It exhibits a reflection coefficient of less than 1 percent and possesses two very valuable and convenient features: a continuous adjustment of the delay shape and of the center frequency. The structure is analyzed theoretically, an equivalent circuit is derived, and expressions for both delay and loss are given. Also presented are design data and experimental results concerning the actual delay equalization of a bandpass filter and the temperature behavior of the equalizer and the filter-equalizer combination. View full abstract»

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  • High-Power S-band Power Divider (Correspondence)

    Publication Year: 1967 , Page(s): 584 - 586
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  • Controlled Wideband Differential Phase Shifters Using Varactor Diodes (Correspondence)

    Publication Year: 1967 , Page(s): 586 - 589
    Cited by:  Patents (1)
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  • Bandwidth Curves for Mumford's Maximally Flat Filter (Correspondence)

    Publication Year: 1967 , Page(s): 589
    Cited by:  Papers (1)
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  • Design Curves for Waveguide Absorbers (Correspondence)

    Publication Year: 1967 , Page(s): 590
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  • Contributors, October, 1967

    Publication Year: 1967 , Page(s): 591 - 592
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  • Microwave Abstracts, October, 1967

    Publication Year: 1967 , Page(s): 592 - 593
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    Based on technical merit and timeliness, microwave papers in journals published outside the United States have been selected and compiled here, many with annotations. Reprints of the papers may be obtainable by writing directly to the author or to the source auoted. The papers are in English unless noted otherwise. View full abstract»

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  • Membership application

    Publication Year: 1967 , Page(s): 594
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  • Information for authors, October, 1967

    Publication Year: 1967 , Page(s): 595
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  • Tunnel-Diode Low-Level Detection

    Publication Year: 1967 , Page(s): 538 - 553
    Cited by:  Papers (5)
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    An analysis of tunnel-diode low-level detection is presented for the purpose of explaining some of the unusual detection characteristics that occur under certain bias conditions. For example, in the vicinity of its inflection bias point, a tunnel diode exhibits a discriminator-like rectification behavior with two sensitivity peaks. When biased at one of these peaks, the diode is capable of unusually high sensitivities, at least an order of magnitude better than the sensitivity of any other known diode. It is shown that these high sensitivities are proportional to (1 - Γ2),where Γ2 is the RF power gain of the detector viewed as a reflection-type amplifier. The resultant gain bandwidth (or sensitivity bandwidth) limitations of the detector are discussed. Unusually high sensitivities are also possible at the lower microwave frequencies when the tunnel diode is biased at its peak current point. A knowledge of the diode static characteristics, the reflection coefficient, and the video circuit permits an accurate analytical evaluation of the sensitivity performance of any tunnel diode, and calculations are carried out for an example diode and compared against measured data. The paper also contains a specific comparison of the relative sensitivity performance of the example tunnel diode versus a hot carrier diode. View full abstract»

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  • The Negative Capacitor, An Impedance Matching Element for Dielectric-Filled Transmission Line (Correspondence)

    Publication Year: 1967 , Page(s): 583 - 584
    Cited by:  Papers (1)
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  • The Overdriven Varactor Upper Sideband Upconverter

    Publication Year: 1967 , Page(s): 561 - 565
    Cited by:  Papers (6)
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    The equations for the overdriven upper sideband upconverter are derived and computer solutions are given for tbe abrupt junction, graded junction, and punch through varactor. The necessary design parameters are presented for the design of an upconverter. The performance of the abrupt, graded, and punch through varactors are compared. View full abstract»

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  • The Accuracy of Finite-Difference Solutions of Laplace's Equation

    Publication Year: 1967 , Page(s): 575 - 582
    Cited by:  Papers (29)
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    The cross sections of most TEM mode transmission lines have reentrant corners or edges where the potential gradient is singular. In this paper the accuracy of the finite-difference solution for the electric field normal to the conductor boundary at a right-angle corner and at the edge of a thin plate is examined. The accuracy of the finite-difference solution is related to the mesh length h, the magnitude of the lattice point residuals, and the finite-difference operator which is used in place of the Laplacian differential operator. The computing time required to solve the mesh equations by the method of successive overrelaxation is specified. The surface charge density in the neighborhood of the boundary singuIarity is expressed as a truncated series of circuIar harmonics. As a result, the integral of the surface charge can be calculated with very good accuracy. The paper concludes by using the harmonic series treatment to determine the capacitance per unit length of a square coaxial transmission line. 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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