中文摘要：

Ka波段毫米波功率放大器的输出功率往往受限于功率合成部分的损耗,其合成器多路之间的隔离度、多级放大模块的级间匹配好坏及整体散热性能是影响整个功放可靠性的重要因素。针对上述毫米波固态功放的特点,提出了一种新颖的高效高可靠性的Ka波段宽带功率合成结构,采用低损耗的多支节波导作为功率分配/合成单元,结合以双探针波导-微带转换结构,实现了高效率的8路功率合成,各路之间隔离度大于25 dB,保证了功率合成器的高可靠性。以此为基础成功研制出一个脉冲式Ka波段固态功率放大器模块,该模块在33～37 GHz频段内,最高输出功率大于16 W,小信号增益大于55 dB,功率合成效率达到87%。

英文摘要：

The output power of Ka band millimeter-wave power amplifier is often limited by the loss of power combiner.The isolation of each way of the combiner,the inter-stage impedance match of multi-stage amplifier and the overall thermal dissipation capability are very important facts of the reliability of a power amplifier module.Considering of these characteristics of millimeter-wave solid-state power amplifier,a new power combination structure with high efficiency,high reliability and broad bandwidth was presented.It took multi-branch waveguide as its power splitting/combining unit,and with dual-probe waveguide-to-microstrip transition structure together,consisted a high efficient 8-way power combiner.The isolation between each way of the combiner is great than 25 dB which ensures high reliability operation.A Ka-band power amplifier module was made based on this structure.It provids a peak output power of more than 16 W,small signal gain of more than 55 dB and the combining-efficiency reaches 87% at the frequency band of 33-37 GHz.