Abstract

ABSTRACT Digital beamforming (DBF) transmitting multibeam planar arra y antenna with nonlinear behaviors of solid-state power amplifiers (SSPA) is discussed. This paper investigates the intermodulation beams produced by the nonlinearity characteristics of the SSPA with multiple carrier components. The Shimbo model is simplified to describe the nonlinear behaviors of SSPA. The optimal SSPA input back-off (IBO) point which is given the desired the carrier and the intermodulatin ratio (C/IM) is simulated. And the tradeoffs between linearity and efficiency of the power amplifier which influence this IBO is also discussed, helping to selecting suitable SSPA device and reducing the dc power consumption in satellite array antenna system. Keywords: DBF transmitting multibeam array ante nna, SSPA, IBO, intermodulation beams 1. INTRODUCTION Satellite multibeam antenna plays an important role on performance of satellite communication systems. Multibeam antenna is in advanced development status which can be implemented in analog or digital beamforming. In contrast to conventional analog beamforming, DBF has the advantages of the flexible multibeam forming, beam scanning and beam reconfiguring. For mobile satellite communication systems, multibeam antenna has a great deal of advantages, such as increasing communication capacity through effective frequency reuse, portable and hand-hold mobile terminal (MT). With the advent of the

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