Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FC3
Session:
Number:4FC3-4
Electrical Design of a Multi-beam Large Antenna for Satellite Payload
So-hyeun Yun, Man-suk Uhn, In-bok Yom,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
As the demand for the universal communication and broadcasting services to personal portable terminals has recently increased, the needs for necessity of a large satellite antenna with a high gain have been on the rise. Multi-beam system applied to a large antenna can dramatically increase transmission capacity and reuse of allocated frequency band [1]. An array-fed reflector antenna by the name of a hybrid antenna composed of a over 20m-class reflector and multi feed array elements are an attractive option for this demand because of their flexibility with regard to beam scanning and beam shaping [2]. Hybrid antennas can be implemented by single fed systems or array-fed systems. Single fed antenna systems maximally use the surface of reflector but the wide angle scanning which is more than ten times of beamwidth is impossible to achieve acceptable quality [1], [3]. The wide angle scan with high gain is possible only if a group of radiating elements in the phased array elements is excited simultaneously with appropriate amplitude and phase. Therefore, the electrical design method of the offset reflector antenna fed by array elements will be described and the electrical analysis of the multi-beam system will be performed in this paper.