ITE Technical Report
Online ISSN : 2433-0914
Print ISSN : 0386-4227
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Volume 15, Issue 59
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1991 Volume 15 Issue 59 Pages Cover1-
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_Cover1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    1991 Volume 15 Issue 59 Pages Toc1-
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_Toc1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • Development of optical fiber amplifiers for optioal CATV transmission systems
    Masayuki Shigematsu, Hiroo Kanamori, Masayuki Nishimura, Toshio Okita, ...
    Article type: Article
    1991 Volume 15 Issue 59 Pages 1-6
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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    An optical fiber amplifier for optical AM-VSS transmission systems has been developed. CNR characteristics was estimated theoretically when using flber amplifiers. It was made clear that the input signal power into a flber amplifier was limited to be more than a certain level for achieving a desired CNR. An optical flber amplifier have been fabricated by using an erbium-doped fiber with high conversion afficiency which we have also developed. The loss budget was improved to be 14dB for CNR of 51dB at the 40 channel transmission.
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  • Small Earth Station Antenna for Satellite News Gathering
    Katsuhiko AOKI, Takashi EBISUI, Shigeru MAKINO, Mitsuo OGIWARA, Soichi ...
    Article type: Article
    1991 Volume 15 Issue 59 Pages 7-12
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_7
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    This paper describes the design and performance of elliptical offset gregorian antenna (2m×1m) for satellite news gathering (SNG). The primary horn of this antenna is a triple mode horn with double flare and has a low cross polarization component. It was confirmed that this antenna with the triple mode horn realized a low sidelobe (29-25log θ dBi). low cross polarization discrimination (35dB) and high efficiency (70%). The results show the effectiveness of this design.
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  • Designs of AM/FM・Mobile Telephone Triway Antenna
    Takayuki TANAKA, Shigeru EGASHIRA, Akihide SAKITANI, Yoshimizu EGASHIR ...
    Article type: Article
    1991 Volume 15 Issue 59 Pages 13-18
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_13
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    In this paper, for AM/FM B.C. and mobile telephone (MT) in vehicles, a triway antenna with double sleeves has been desined. one of the triway antennas has been analyzed numerically and the results have been compared with experimental results.
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  • Image Type antenna of Two and Four Stacked Circular-Loops
    Toshikazu Korekado, Kiyoshi Okuno, Sadao Kurazono
    Article type: Article
    1991 Volume 15 Issue 59 Pages 19-24
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_19
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    A high gain image type antenna combined two and four stacked circular loop antenna with a metal plate is analyzed by a proposed theoretical model. Several computed curves are given, and the values computed for current distributions and radiation characteristics are substantiated by experiments. Computed radiation characteristics are utilized to obtain a desirable configuration, and four stacked image antenna used to UHF TV broadcast is experimentally examined.
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  • Wideband Monopole Antenna of Circular Disc
    Satoshi Honda, Michiaki Ito, Yoshio Jinbo, Hajime Seki
    Article type: Article
    1991 Volume 15 Issue 59 Pages 25-30
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_25
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    Extraordinary increase of operable frequency range is achieved when the cylindrical rod of a monopole antenna is replaced by a circular disc. The radiation patten is omni-directional and the beam width is slightly frequency-dependent. A mesh of wire may also be used instead of a solid disc. The entire broadcast TV channels (VHF and UHF) are covered by a single disc monopole antenna of 500mm diameter.
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  • Propagation Characteristics for the Next Generation Satellite Broadcasting at Frequencies above 20 GHz
    Hajime FUKUCHI
    Article type: Article
    1991 Volume 15 Issue 59 Pages 31-36
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_31
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    As the next generation satellite broadcasting system, the system which uses the K-band, such as 22GHz band, have been studied. For the design of this kind of system, it is necessary to have detailed knowledge of the wave propagation characteristics along satellite-to-earth path. In this paper, propagation characteristics ; rain attenuation, cross-polarization discrimination, etc., in the K-band are explained together with mitigation technologies of those effects. One system example of K-band satellite broadcasting is proposed, in which time-diversity technology is introduced to compensate the rain attenuation.
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  • FIELD STRENGTH CHART FOR RADIO AND TELEVISION PROPAGATION
    Ryoichi Oda, Kazuaki Wakai, Tadao Sugita
    Article type: Article
    1991 Volume 15 Issue 59 Pages 37-42
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_37
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    Development of the field strength chart is used for determination of the optimum antenna direction for radio and television propagation. We have an idea of the chart has a constant field intensity characteristic, following the cosecant beams on the propagation. The field intensity characteristic shows constant gradient curves, and the free space field intensity value is shown at horizontal line on the chart. This field strength chart is useful for any praotical measurements for radio and television electromagnetic wave propagation, and we discuss the CCIR propagation characteristics.
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 15 Issue 59 Pages App1-
    Published: October 24, 1991
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.15.59_App1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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