Presentation 2004/7/14
Radiation Characteristics of Imaging Reflector Antenna in 21-GHz Band
Shoji TANAKA, Kazunori YOKOHATA, Susumu NAKAZAWA, Takao MURATA,
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Abstract(in English) 21GHz-band satellite broadcasting is expected for one of advanced satellite broadcasting system capable of ultrahigh-definition TV and multi-channel HDTV broadcasting. To overcome large signal attenuation caused by rainfall in the 21GHz-band, we are now moving forward on on-board large phased array antennas that will increase the radiation power only for rainfall areas to compensate for rain attenuation. Imaging reflector antenna is a strong candidate for antenna configuration of 21-GHz band broadcasting satellites from the viewpoint of wide beam scanning characteristics and small range of excitation power variation. In this article, the relationship between the antenna gain and configuration parameters such as an aperture diameter of radiating element and magnification coefficient were studied. The radiation pattern was designed to compensate for rain attenuation by adjusting the amplitude and phase of excitation signals fed to the feed array. Then, we evaluated the radiation pattern designed by adjusting only phase of excitation signals while each amplitude was fixed. As a result, it was confirmed that the performance of radiation pattern was almost comparable to the radiation pattern designed by controlling both of amplitude and phase. Furthermore, the power efficiency could be improved.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) compensation technique of rain attenuation / array-fed reflector antenna / imaging reflector antenna / power efficiency
Paper # SAT2004-43
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Committee SAT
Conference Date 2004/7/14(1days)
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Registration To Satellite Telecommunications (SAT)
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Radiation Characteristics of Imaging Reflector Antenna in 21-GHz Band
Sub Title (in English)
Keyword(1) compensation technique of rain attenuation
Keyword(2) array-fed reflector antenna
Keyword(3) imaging reflector antenna
Keyword(4) power efficiency
1st Author's Name Shoji TANAKA
1st Author's Affiliation NHK Science and Technical Research Laboratories()
2nd Author's Name Kazunori YOKOHATA
2nd Author's Affiliation NHK Science and Technical Research Laboratories
3rd Author's Name Susumu NAKAZAWA
3rd Author's Affiliation NHK Science and Technical Research Laboratories
4th Author's Name Takao MURATA
4th Author's Affiliation NHK Engineering Administration Department
Date 2004/7/14
Paper # SAT2004-43
Volume (vol) vol.104
Number (no) 204
Page pp.pp.-
#Pages 6
Date of Issue