This subject aim at designing a linear power amplifer whose output power is 40w for 225 - 450mhz band . but it seems not easy to finish the task because of this power amplifier own unique requirements including high output power , broad working frequency band , high linearity , and flat gain . due to the complexity involved , theoretically several soltuions are derived in the final scheme such as broadband matching technology , power - retreat , power synthesize , automatic power control and negative feedback . in addition , the design will be optimized by eda software and the final test result indicates that our design is successful 本课题的目标是研制一个输出功率为40w的225 450mhz的线性功率放大器。由于该功放要求输出功率大，工作频带宽，带内增益波动小，线性度高，所以其终合设计难度大。鉴于这个原因，在理论设计上笔者采用了宽带匹配、功率合成、功率回退、负反馈、自动功率控制等技术；在实践中精心设计电路，并且配合eda软件仿真，最终达到所要求的指标。
The multilevel binary power combing technique based on 3 - db hybrid have experienced heavily development , because of the development of technique the millimeter - wave devices have endured , because of the mature of millimeter - wave monolithic integrated circuits which make the circuits fabricated more easily and cost effectively , and because of the design of low loss 3 - db hybrid which is key to improve the combing efficiency 以3 - db电桥为基础的多级二进制功率合成技术得以迅速发展，其原因除了毫米波器件技术的发展以及毫米波单片集成电路（ mimic ）成熟而降低了电路制作的难度与成本外，设计出低损耗的3 - db电桥是提高合成效率的关键。
Design of a high output power , high combining efficiency power combiner at ka - band based on a slotted - waveguide was presented in this thesis . slotted - waveguide power divider , which achieves power - dividing and waveguide - microstrip transition at the same time takes the advantages of low profile , low cost and high combining efficiency 用开槽波导同时完成功率分配/合成及波导-微带过渡,具有体积小、合成效率高的特点,既不属于空间功率合成又与传统的电路合成有所区别。
The theory of wilkinson power combiner and ratrace coupler is analyzed by using the odd - even mode method in this thesis . on the basis of the theoretical analysis , we designed and tested the wilkinson power divider , the modified wilkinson power divider and ratrace coupler , good agreement is observed . in addition we propose a power combiner based on a waveguide - to - microstrip transition using antipodal finlines . this structure united the two functions of transition and equal power division , it can not only be used in the circuit power combiner but also be used in spatial power combiner 另外提出一种基于鳍线波导微带过渡功分器，该结构将过渡与功分两种功能完全结合，不但可以用于电路合成式功率合成，也可用于空间功率合成中。对功率合成器，其主要指标是输出功率和效率，其中提高输出功率和效率的一个方法是在输出端抑制谐波，主要是对二次谐波的抑制。
Furthermore , performance degradation due to device failures and the contribution of phase and amplitude uniformity to power - combining efficient were also simulated and measured . on the base of the researches above , a power combiner with an output power of 10watt , combining efficiency of 80 % was finally designed and realized 分析了各关键参数对耦合系数的影响,以及幅相一致性对合成效率的影响,测试了功率合成器不同位置芯片失效对整体输出功率的影响,经比较,与理论分析结果吻合良好。
Above all , we introduce the development of millimeter - wave power combiner and the novel study production at home and abroad . taking circuit form into consideration in the design of millimeter - wave power combiner , the gauge of high reliability and high performance must be defined . we design two kinds of waveguide - to - microstrip transition , the first kind of transition based on the achievement of a matched impedance probe show excellent performance , the second transition can also have good performance on some conditions through numerical simulation 介绍了国内外毫米波功率合成的发展状况和最新的研究成果。考虑拟以电路合成方式做毫米波功率合成器，必须解决与功率合成有关的相关组件的高可靠高性能指标问题，因此设计了两种波导微带过渡结构，其中探针式过渡测试达到了较好的效果，并对所提出的一种新型微带波导过渡进行了仿真，在一定条件下具有较好的性能。
