Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TF2
Session:
Number:3TF2-1
Antenna Array Feed of Minimum Power Consumption by Adopting the Optimum Amplifier Selection
Takayuki Nakanishi, Kazunari Kihira, Tamotsu Nishino, Yoshihiko Konishi,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
In recent years, multibeam satellite systems with hundreds of spot beams have been developed and studied [1,2]. A Multibeam satellite system realizes adaptive frequency allocation for efficient frequency reuse, and has the flexibility to control traffic in communication. Generally, most multibeam satellite systems use an array-fed reflector antenna. When natural disasters (earthquake, flood, tsunami, etc.) happen, the communications traffics concentrate at the area because many people use cellular phones and access to the Internet. The corresponding beam to the area requires the highest output power opperation in the emergency case. The amplifiers consist of the beam is operated at the required output power (ROP) in the emergency case. Generally, all amplifiers have the same maximum output power (MOP) corresponding to the gate width. However, not all the amplifiers require the same power as the MOP. Because the ROP of amplifier is different for each antenna element. The amplifier whose MOP is much higher than the ROP has low efficiency. To minimize power consumption of array-fed element, we need to design optimal selection of MOP of amplifiers. Also, in practice design, only a few kinds of amplifiers with different MOP could be used. In this paper, to minimize the power consumption of array-fed element, we propose the method how to select the MOP for each amplifier of antenna element of array antenna system.