星用C频段50W固态功率放大器设计

Design on C-band 50W Solid State PowerAmplifier for Satellite Application

为了满足通信卫星对于固态功率放大器高功率、高效率、高集成的要求,文章提出了一种星用C频段固态功率放大器的设计方法。首先通过采用半导体单片集成电路芯片,对射频电路进行创新性设计,将电调衰减、数字增益控制、功率放大等功能集成在一个模块中,实现功率放大器的高集成;其次,通过整机热设计,并结合红外热像仪测试,优化高功率氮化镓器件的散热途径,在实现整机大功率输出的同时,保证整机的高可靠应用;最后,对电源电路进行优化设计,使得固放电源具备高效率、高稳定的特点,为射频电路提供稳定的供电。温度循环、热真空等试验结果表明,所研制的C频段50W固放性能稳定、可靠性高,满足星载应用要求。

To meet the high power,high efficiency,high integration requirements of communications satellite on solid state power amplifier,a design approach on C-band solid state power amplifier for satellite application was proposed.Firstly,the functions of electrically controlled attenuation,digital gain control and power amplifier are integrated in a single module,by using monolithic microwave integrated circuit(MMIC)chips and researching the microwave circuits deeply,to achieve the high integration of power amplifier.Secondly,heat dissipation simulation and thermal infrared imager measurements were performed,to ensure the reliability of the high power module.Lastly,the design of DC power circuits were optimized,to achieve the high efficiency,high stability characteristics,and to ensure the reliable power supply to the radio circuits.Thermal cycling and thermal vacuum measurements indicate that the produced C-band 50W solid state power amplifier has sufficient reliability and satisfies the requirement of satellite application.