太赫兹间隙波导径向功率合成技术研究

Research on Terahertz Gap Waveguide Radial Power Combining Technology

针对太赫兹固态功放研制对于低损耗功率合成器的需求,基于间隙波导技术在200~240 GHz的频段开发了一种4路波导径向功率合成器。经无源测试,该间隙波导径向合成器的回波损耗优于-15 dB,无源合成效率达到了88.7%,展现出了间隙波导在太赫兹频段的低损耗特性。通过封装2只GaN功放芯片形成功率模块为基本单元,进一步开展有源功率合成,最终在220 GHz实现了311 mW的峰值输出功率,在200~240 GHz的频率范围内平均功率合成效率为81%。

To meet the demand for low loss power combiners in the development of terahertz solid-state power amplifiers,a 4-way radial waveguide power combiner was developed at 200-240 GHz with gap waveguide technology.The passive tested return loss is better than-15 dB,with a passive combining efficiency of 88.7%,which shows the low-loss characteristics of the gap waveguide at terahertz band.Based on the power amplifier module packaged with two GaN MMICs,further active power combining is carried out.A peak output power of 311 mW is achieved at 220 GHz,and the average power combining efficiency of 81%is got cross over the frequency band of 200-240 GHz.