毫米波波导多路功率分配合成器研究

发布时间：2018-04-13 18:00

本文选题：径向功率分配/合成器 + 波导　；参考：《华南理工大学》2015年硕士论文

【摘要】：近年来,无论在民用还是在军用领域,毫米波技术都得到了越来越多的重视。在通信应用方面,毫米波通信适应了频谱资源向高端发展的技术趋势;在军事领域,毫米波技术是重要的信息对抗手段;甚至在医疗领域,毫米波也具有巨大的发展潜力。而功率放大器正是毫米波通信系统的关键元件,然而,随着频率的升高,单个固态器件的输出功率逐渐降低,通常达不到实际系统的需求。为了得到足够大的输出功率,可以将多个固态器件的输出功率合成从而实现。为此,毫米波功率分配/合成器成为一个研究热点。现有的毫米波空间功率分配/合成技术可以分为二进制树形结构、行波结构、波导内空间功率合成结构以及径向结构等。相比其他几种结构,径向结构具有一次性分配/合成多路信号,且每路信号的幅度和相位一致性良好等优点。本论文主要着眼于实现高隔离度的小型化径向功率分配/合成器,同时还对一种已有的共面魔T结构进行了结构上的优化,主要工作如下:1、设计了一种基于E-T功分网络的的矩形波导-圆波导模式转换器。该结构利用了圆波导的TE01传输模的电场力线绕圆周旋转的特点,通过设计基于E-T分支器单元的一分四路功分网络并与圆波导进行连接,实现了将矩形波导中传播的TE10主模成功变换为圆波导中的TE01模,与传统结构相比,具有尺寸小,能实现高模式纯净度等优点。论文介绍了其工作原理和设计步骤,最后加工和测试了一个Ka波段的模式转换器背靠背结构,验证了设计的正确性。2、设计了基于上述圆波导模式转换器的20路高隔离径向功率分配/合成器。该功分器通过引入设计加工好的圆波导模式转换器,适应了输入输出端口皆为标准矩形波导的设计需求,并大幅减小了尺寸。同时,通过在输出端口间插入电阻膜片,改善了端口匹配和隔离。本文详细阐述了其工作原理和实现方法,最后加工测试了一个实物结构,测试结果与仿真结果吻合良好,显示出良好的特性。3、设计了基于脊波导的共面波导魔T。该结构在前人基于波导-微带探针的具有共面臂的波导魔T研究工作的基础上,使用脊波导耦合结构取代微带探针,提高了功率容量,并且降低了加工难度。在设计、仿真工作完成后,加工了一个脊波导魔T实物,并进行了测试,最后对测试结果进行分析。
[Abstract]:In recent years, millimeter wave technology has been paid more and more attention in both civil and military fields.In communication applications, millimeter-wave communication adapts to the technical trend of the high-end development of spectrum resources; in the military field, millimeter-wave technology is an important means of information countermeasure; even in the medical field, millimeter-wave has great development potential.Power amplifier is the key component of millimeter-wave communication system. However, with the increase of frequency, the output power of a single solid-state device decreases gradually, which usually falls short of the requirement of the actual system.In order to obtain enough output power, the output power of multiple solid state devices can be combined to achieve.Therefore, millimeter wave power distribution / synthesizer has become a research hotspot.The existing millimeter-wave spatial power allocation / synthesis techniques can be divided into binary tree structure, traveling wave structure, spatial power synthesis structure in waveguide and radial structure.Compared with other structures, the radial structure has the advantages of one-time allocation / synthesis of multiple signals, and good consistency of amplitude and phase of each signal.In this paper, we mainly focus on the realization of a miniaturized radial power distribution / synthesizer with high isolation. At the same time, we also optimize the structure of an existing coplanar magic T structure.The main work is as follows: 1. A rectangular wave-circular waveguide mode converter based on E-T power division network is designed.The structure utilizes the characteristic that the electric field force wire of the TE01 transmission mode of circular waveguide rotates around the circle by designing a four-way power distribution network based on E-T branch unit and connecting with the circular waveguide.The TE10 main mode propagating in rectangular waveguide is successfully transformed into TE01 mode in circular waveguide. Compared with the traditional structure, it has the advantages of small size and high mode purity.The working principle and design steps are introduced in this paper. Finally, a Ka-band back-to-back structure of mode converter is fabricated and tested.The correctness of the design is verified. 2. A 20-channel high isolation radial power distribution / synthesizer based on the circular waveguide mode converter is designed.By introducing the designed circular waveguide mode converter, the power divider adapts to the design of standard rectangular waveguides with input and output ports, and greatly reduces the size.At the same time, the port matching and isolation are improved by inserting resistance diaphragm between the output ports.In this paper, the working principle and the implementation method are described in detail. Finally, a physical structure is processed and tested. The test results are in good agreement with the simulation results, showing good characteristics. 3. The coplanar waveguide magic T based on ridge waveguide is designed.On the basis of the previous work of waveguide magic T with coplanar arm based on waveguide microstrip probe, the ridge waveguide coupling structure is used to replace the microstrip probe, which improves the power capacity and reduces the processing difficulty.After the design and simulation work is completed, a ridge waveguide magic T object is fabricated and tested. Finally, the test results are analyzed.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN626;TN73

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