A Study on 21-GHz Band Direct Broadcast Satellite using Phased Array Antenna -System Concept and Key Technologies to Compensate for Rain Attenuation-

Paper number

IAC-05-B3.2.03

Author

Mr. Kazuo Imai, STRL of Japan Broadcasting Corporation (NHK), Japan

Year

2005

Abstract

Succeeding the direct broadcast satellite service in the 12-GHz band, we are studying an advanced broadcasting satellite systems using 21-GHz band. The 21-GHz band has 600-MHz bandwidth and it is expected to be the strong candidate to broadcast the wide-band program such as Super High-Vision broadcasting. However, the rain attenuation in the 21-GHz band is very large compared to that in the 12-GHz band. Hence effective rain attenuation compensation techniques are needed to achieve the reliable satellite broadcast services in the 21-GHz band. 
We proposed an onboard phased array antenna system that will increase radiation power only in areas with rain fall to compensate rain attenuation for the 21-GHz band.
This paper describes an array-fed reflection antenna to concentrate the RF power to the narrow area using small number of array elements. Also, it describes a newly developed 21-GHz band mini-TWT with small cross-sectional area used as the array element. 
Furthermore, it introduces the long block-length interleave transmission scheme as new rain attenuation mitigation technique. 

Abstract document

IAC-05-B3.2.03.pdf

Manuscript document

IAC-05-B3.2.03.pdf (🔒 authorized access only).

To get the manuscript, please contact IAF Secretariat.