Ka频段200W线性固态功放设计

Design of a Ka-Band 200W High Linear Solid-State Power Amplifier

介绍了一种Ka频段200W高线性度固态功放的工程实现。采用混合式功率合成与波导功率合成相结合的技术路线,在Ka频段实现了近百路的高效功率合成。功放共合成了96个功放芯片,连续波输出功率可达250W;针对功率器件线性度不足的现状,采用射频预失真技术优化其线性度,三阶互调指标优于-33dBc,改善幅度最高达15dB;固态功放设计中充分考虑了工程化与产品化性能,结构外形标准、散热性能良好,并配置了完善的控保功能,在可靠性及实用性方面均初步达到工程使用的要求。

This paper introduces an engineering realization of a Ka-band 200W high linear solid-state power amplifier （SSPA）. By adopting hybrid and waveguide power combining technologies, a continuous wave output power of 250W can be realized at Ka-band with 96 channels combined. In order to improve its linearity, RF predistortion technology is applied. And the third-order intermodulation is better than -33dBc which the improvement is up to 15dB. To meet engineering and productive requirement, a standard configuration and good heat dissipation are designed. The control and maintenance func- tions are provided, the operation and reliability are both met the engineering requirement.