When two overhead conductors a few inches a part are used for each phase of a transmission line circuit, instead of one larger conductor, the reactance is reduced 20 per cent or more. Where voltage drop determines the...
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A method of producing frequency modulation is described wherein an eighth-wave radio-frequency transmission line is used as a modulation device. One end of the transmission line serves as a part of the tank circuit of...
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A method of producing frequency modulation is described wherein an eighth-wave radio-frequency transmission line is used as a modulation device. One end of the transmission line serves as a part of the tank circuit of the oscillator while at the other end is placed a variable resistance, such as a vacuum tube. Absolute linearity may be obtained with negligible amplitude modulation. A brief description of different types of transmission lines used is also given.
A new pulse regenerating circuit is developed, which has no reflection and transmits pulses unidirectionally, when it is inserted in a transmission line. The circuit consists of a pair of Esaki diodes connected face t...
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A new pulse regenerating circuit is developed, which has no reflection and transmits pulses unidirectionally, when it is inserted in a transmission line. The circuit consists of a pair of Esaki diodes connected face to face and a transformer.
Recent field tests of a 230-kV, 20 000-MVA oil circuit breaker are discussed and evaluated. Initial test results revealed requirements for design modifications, the nature of which are reviewed. An interim field devel...
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Recent field tests of a 230-kV, 20 000-MVA oil circuit breaker are discussed and evaluated. Initial test results revealed requirements for design modifications, the nature of which are reviewed. An interim field development test and the final acceptance tests are renewed and data are presented. The need for a developmental field test site and the characteristics and organization of one such facility are described.
Among the various approaches to the design of microwave integrated circuits, thick film hybrids combine a relative ease of manufacturing with excellent performance at the lower portion of the microwave frequency spect...
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Among the various approaches to the design of microwave integrated circuits, thick film hybrids combine a relative ease of manufacturing with excellent performance at the lower portion of the microwave frequency spectrum where high performance semiconductor devices are now available in a wide variety. When using conventional ceramic substrates for such circuitry, limitations exist in solving the problem of obtaining maximum degree of compactness at very low impedance levels required for optimum power handling capability of active semiconductor devices. One approach to this problem discussed here is the utilization of microstrip transmission line circuits on substrates with very high dielectric constants (/spl epsi//sub r/ = 33). A theoretical analysis of the microstrip transmission Iine structure, when based on conformal mapping techniques with the usual simplifying assumption of homogeneity throughout the entire field region, is entirely inaccurate when applied to high dielectric constants as considered here. A solution of this problem is presented which applied well known finite difference approximations of Laplace's equation in combination with a successive over-relaxatian program on a digital Computer.
This report was prepared as an activity of the IEEE Working Group* on Capacitance Current Switching of the Power Circuit Breaker Subcommittee of the IEEE Switchgear Committee. It includes references to the switching o...
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This report was prepared as an activity of the IEEE Working Group* on Capacitance Current Switching of the Power Circuit Breaker Subcommittee of the IEEE Switchgear Committee. It includes references to the switching of transmission lines, cables, and shunt capacitors, but excludes series capacitors. The references are arranged by years.
DURING THE PAST YEAR the Esaki diode has become firmly established as a microwave element. Several investigators have reported oscillator operating at X band with germanium diodes^1,2. Gallium-arsenide units have osci...
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DURING THE PAST YEAR the Esaki diode has become firmly established as a microwave element. Several investigators have reported oscillator operating at X band with germanium diodes^1,2. Gallium-arsenide units have oscillated with fundamental frequencies as high as 103 kMc^3. Amplifiers have been operated up to 26 kMc^4,5. The high frequency limit of usefulness appears to be dictated by the junction capacity rather than by transit time of the electrons.
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