T. Y. Otoshi

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In past years, it was known that paint on reflector surfaces causes degradation of antenna gain and noise temperatures, but it was not known how much degradation occurs as a function of paint and primer thickness or frequency. This article presents an approach used to study the properties of paint by first measuring the complex dielectric constants of paint(More)
This article presents an analytical method for determining the exact distance a load is required to be offset from a passive two-port network to obtain maximum or minimum return losses from the terminated two-port network. Equations are derived in terms of two-port network S-parameters and load reflection coefficient. The equations are useful for predicting(More)
In Part I of this article, complex dielectric constant values in the frequency range of 24 through 34 GHz were presented for paints and primers currently being used as well as for candidate replacements. Tables of complex dielectric constant values were given for (1) Triangle no. 6 white flat paint, (2) zinc chromate primer, (3) 18FHR6 white water-based(More)
chemical lasers of the hydrogen-halogen variety are capable of the above indicated efficiency and output (16-18). Of the Cw C02 industrial lasers, the sealed types are limited to outputs of a few hundred watts. The axial flow lasers of folded and multistage construction are acceptable, preferably those having a recirculating system in which a catalyst (or a(More)
ABSTRACT A new 34-meter research and development antenna was fabricated and tested as a precursor to introducing beamwaveguide antennas and Ka-band frequencies into the NASA/JPL Deep Space Network. For deep space use, system noise temperature is a critical parameter. There are thought to be two major contributors to noise temperature in a BWG system: the(More)
Multi-element neutron activation analysis method was applied to the determination of metallic foreign bodies which penetrated into the eyes of workers while engaged in grinding and cutting work. A total of 23 small pieces ranging in size from 1 to 10(2) mg were surgically obtained and then analyzed non-destructively with only simple washing treatment. The(More)
This article presents the results of tests performed to verify predicted sources of receive antenna gain-to-system noise temperature ratio (G/T ) improvements for the DSS-13 beam-waveguide antenna. The sources that gave the most improvement were (1) covering holography adjustment holes with aluminum-tape circular disks, (2) covering all panel gaps on the(More)
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