毫米波准光波束功率合成技术的研究

发布时间：2018-04-21 08:46

本文选题：准光波束功率合成 + 反射镜　；参考：《东南大学》2017年硕士论文

【摘要】：随着亚毫米波、太赫兹技术的发展,要求提高信号源输出功率以满足系统需求。目前为止,无论是电真空技术、光技术或固态电子技术,在太赫兹波段都很难产生满足系统要求的输出功率。在单个发射机输出功率难以满足需求的情况下,在微波毫米波频段广泛采用的功率合成技术是提高输出功率的一条有效的技术途径。传统电路级的固态功率合成技术通过传输线进行功率传输,随着合成器件数目的增加,电路长度、电路节点以及损耗都在增加,最终会抵消功率合成优势。波导空间功率合成技术虽然物理结构相比电路简单,但是随着工作频率的升高,波导的尺寸越来越小,在太赫兹频段实现这个技术难度太大。因此,波导空间功率合成技术在太赫兹波段难以应用。准光波束功率合成技术把多个波束在自由空间中叠加,再合成一个大波束来实现功率合成。各功率单元之间采用并行工作方式,避免了电路以及波导功率合成在高频领域合成数量受限以及损耗大等缺陷。该技术适合毫米波高频段和太赫兹频段的功率合成,且不论要合成的电磁波是由电真空技术、光技术还是固态电子技术产生,只要它们是相干的即可。本文在前人的基础之上,设计研究了一种由双曲镜面和椭球镜面组成的N路对称结构的准光波束功率合成网络。利用椭球反射镜和双曲反射镜对高斯束的变换特性,实现N路相干高斯波束到单路波束的传输转换。同时,设计波纹结构和赋形曲线结构的两种模式转换模块,通过模式转换模块,将合成波束中的高斯高次分量转换为高斯主模,其中经赋形结构变换后的波束合成效率可以达到74.75%,高斯耦合效率高达96.58%。最后,设计了基于双椭球反射面结构的功率合成网络。通过圆锥部件减小合成波束的半径,在变换后的波束后端添加双椭球反射面通道,利用椭球反射面的波束汇聚效果,对波束进行两次汇聚变换,从而实现波束在空间的汇聚,能量在中心区域集中分布,仿真计算的波束合成效率可以达到:87.65%。
[Abstract]:With the development of submillimeter wave and terahertz technology, it is necessary to improve the output power of the signal source to meet the system requirements. Up to now, it is very difficult to produce output power in terahertz band, whether it is electric vacuum technology, optical technology or solid-state electronic technology. Under the condition that the output power of a single transmitter is difficult to meet the demand, the widely used power combination technology in the microwave and millimeter wave band is an effective technical way to improve the output power. The traditional solid-state power synthesis technology transmits power through transmission lines. With the increase of the number of composite devices, the length of the circuit, the circuit node and the loss are all increasing, which will eventually cancel the power combination advantage. Although the physical structure of waveguide space power synthesizer is simpler than that of circuit, with the increase of operating frequency, the size of waveguide becomes smaller and smaller, so it is very difficult to realize this technique in terahertz band. Therefore, waveguide space power synthesis technology is difficult to be applied in terahertz band. Quasi-optical beam power synthesis technique superposes multiple beams in free space and then synthesizes a large beam to achieve power synthesis. The parallel operation mode is adopted among the power units to avoid the limitation of the number and loss of the circuit and waveguide power synthesis in the high frequency domain. This technique is suitable for the power combination of millimeter wave high frequency band and terahertz band, regardless of whether the electromagnetic wave to be synthesized is produced by electric vacuum technology, optical technology or solid state electronic technology, as long as they are coherent. In this paper, a quasi-optical beam power synthesis network with N-path symmetric structure composed of hyperbolic mirror and ellipsoidal mirror is designed and studied on the basis of previous studies. The transformation characteristics of ellipsoidal mirror and hyperbolic mirror to Gao Si beam are used to realize the transfer of N-channel coherent Gao Si beam to single-channel beam. At the same time, two mode conversion modules of corrugated structure and shape curve structure are designed. Through the mode conversion module, the Gao Si high-order component in the composite beam is converted into the Gao Si main mode. The beam-forming efficiency can reach 74.75 and the coupling efficiency of Gao Si is 96.58. Finally, a power synthesis network based on double ellipsoid reflector structure is designed. The radius of the composite beam is reduced by conical component, and a double-ellipsoidal reflector channel is added to the rear end of the transformed beam. Using the beam convergence effect of the ellipsoidal reflector, the beam is converged twice to realize the convergence of the beam in the space. The energy distribution is concentrated in the center area, and the efficiency of beam synthesis can reach to 87.65%.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN73

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