ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
Broadcasting and Communication Technologies(BCT)
Session ID : BCT2017-94
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Efforts toward Transmission Experiments Utilizing Transponder of 21-GHz Band on Broadcasting Satellite
*Masafumi NAGASAKASusumu NAKAZAWAHisashi SUJIKAIShoji TANAKA
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Abstract
The broadcasting satellite BSAT-4a was successfully launched on September 30th, 2017 (JST). BSAT-4a has a 21GHz-band experimental transponder in addition to the 12-GHz-band broadcasting transponders using right- and left-hand circular polarization. We are planning to use the 21-GHz-band transponder for various experiments, for example, on wideband-transmission and rain-attenuation measurement. As one of the efforts toward the experiments, we fabricated a 21-GHz-band receiving antenna with a 1.5 m parabolic reflector. The receiving frequency is 21.4 to 22.0 GHz and the polarizations are right- and left-hand circular polarization. Measured results showed that the antenna gain and cross-polarization discrimination were more than 48 dBi and 32 dB, respectively. We also confirmed that the fabricated antenna satisfied the reference pattern of Rec. ITU-R BO.1900.
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© 2017 The Institute of Image Information and Television Engineers
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