【作者】 赵伟；

【导师】 延波；

【作者基本信息】 电子科技大学 ， 电磁场与微波技术， 2014， 硕士

【摘要】 在毫米波频段,全固态功率放大器因其高可靠性,低供电电压,易于实现轻量化和模块化的特点在越来越多的应用场合取代了传统的电真空器件。当单个芯片放大器输出功率不能满足要求时,采用功率合成放大技术是目前最有效的办法。为了克服传统二进制波导电桥结构在多级级联后合成效率下降的瓶颈,本课题采用径向波导空间功率合成的方法来实现多路高功率放大技术的突破。本文针对一般性的功率合成放大器,采用合成网络参数化的方法分析了功率合成放大器的工作状态,讨论了合成放大器连带失效性的问题,推导了电路损耗和幅相的不一致性对合成效率的影响,阐述了径向波导功率合成技术的原理,以此为基础设计了两种8mm频段径向波导功率合成网络。依据同轴主模轴对称的特点,设计制作了同轴激励八路径向功率合成网络。实测结果表明,在29GHz-31GHz频带内,背靠背网络插入损耗约为2.7dB。基于圆波导第五高次模圆对称的特点,设计仿真了圆波导激励十六路功率分配网络,利用模式渐变的方法设计了marine型模式转换器。仿真结果表明该功率分配网络达到了宽频带低损耗的要求。基于同轴八路径向功率分配网络,采用模块化设计的思路,制作了8mm频段八路径向功率合成放大器。实测结果显示,在29GHz-31GHz频率范围内,饱和输出功率在30GHz处达到最大值31.72dBm,1dB压缩点输出功率在30GHz处达到最大值31.04dBm,最大合成效率在30GHz达到83%。此多路径向波导功率合成放大器的成功研制表明,基于直接一分多路空间功率合成思想的径向波导功率合成结构可以应用于多路高功率场合,是对多路功率合成技术的一次有效拓展与突破。由于国内鲜有此类径向结构的功率合成放大器的报道,所以此研究成果具有重要的研究与参考价值。更多还原

【Abstract】 In the millimeter-wave band, the electronic vacuum power amplifier has been replaced by solid-state power amplifiers due to advantages of high reliability, low DC supply voltage, lightweight and easy to modularize. The use of power combining and amplifying technology is the most effective way when the requirements can not be satisfied with output power of MMIC amplifier.The combining efficiency reduced following multi-stage concatenation of 3dB waveguide bridge.In order to overcome the barrier, the method of radial waveguide spatial power combining was taken to seek a breakthrough in the multi-way and high-power situations in this issue.To the general power combining amplifiers, this paper analyzed the state of power combining amplifier with the method of Parameterization of combining network, discussed the related invalid issues of combining power amplifier, deduced the influence of combining efficiency caused by circuit losses and amplitude and phase imbalance, elaborated the principles of radial waveguide power combining technology. I designed of two 8mm band radial waveguide power combiner on this basis.Based on the dominant mode of coaxial line, designed the 8 way power combiner network excited by coaxial. Test result show that: within the frequency range 29 GHz to 31 GHz, the insertion loss is about 2.7dB. Based on the feature of the fifth high-order mode of circular waveguide, Designed and simulated the sixteen-way power combiner excited by circular waveguide, designed the marine-type mode converter on the basis of gradual change of mode. The simulation results show that the power combiner meet the requirements of low loss and wide band.Based on the idea of modular design and 8-way power combiner excited by coaxial, I produced the8-way radial power combining amplifier of 8mm band.Test results show that: in the frequency range 29GHz-31 GHz, the saturated output power achieve the maximum of 31.72 dBm at 30 GHz, the 1dB compression point output power achieve the maximum of 31.04 dBm at 30 GHz, the peak of combining efficiency is 83% at 30 GHz.The successful development of waveguide power combining amplifier revealed that: the structure based on the idea of spatial power combining Technology of one divided directly multiple can be applied to multi-way and high power applications and as a effective expansion and breakthrough has the value of research and reference.更多还原