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固态源准光功率合成的典型结构包括一个曲率半径为R,口面半径为r的输出球面装置和一个输入混合球台装置。两装置的中心相距为L,其中输入混合球台装置由一个平面和曲率半径为R、内口面半径为r′、外口面半径为r的球台组成。在球台的内口面上有一个源阵结构,它对整个合成器的性能起着关键作用,也是固态源准光功率合成器设计的核心问题。在源阵上安装有数个至数十个的有源器件(例如耿氏器件或雪崩器件),用直流低压电源供电的这些有源器件,把直流能量不断转换为准光腔内的射频能量,并通过射频能量与有源器件之间循环往复的相互作用,使有源器件激发产生更大射频能量。当准光腔尺寸合适的条件下形成稳定的射频振荡,射频能量经阻抗变换装置输出。由于准光腔具有比波导腔高得多的品质因数,因此准光合成器的频谱特性等远远优于波导腔功率合成器。源阵结构是整个合成器的心脏,它的设计包括射频辐射单元的相互间隔和各自的取向,也包括有源器件的馈电与散热。这些问题往往矛盾交叉,错综复杂,然而源阵设计的优劣直接影响合成器的主要性能,(如基模功率P、分数功率F、合成效率η,)因此源阵的设计是本文重点内容。本文给出设计公式与分析方法,介绍优化设计的计算步骤,确定合成器的具体结构与尺寸,最后说明实验结果与结论。
The typical structure of the solid-state source optical power synthesis consists of an output spherical device with a radius of curvature R, a radius of face r, and an input mixing stage device. The centers of the two devices are separated by a distance L, wherein the input mixing table device consists of a table with a radius of curvature R and a radius r ’of the inner mouth and a radius r of the outer mouth. There is a source array structure on the inner face of the table, which plays a key role in the performance of the entire synthesizer. It is also a core issue in the design of a solid state source quasi-optical power combiner. In the source array installed on the array of several dozens of active devices (such as Gunn device or avalanche devices), with DC low voltage power supply of these active devices, the continuous conversion of DC energy into the quasi-optical cavity RF energy, And through the reciprocating interaction between the radio frequency energy and the active device, the active device is excited to generate more radio frequency energy. When the quasi-cavity size suitable for the formation of a stable RF oscillation, RF energy output by the impedance transformation device. Since the quasi-optical cavity has a much higher quality factor than the waveguide cavity, the spectral characteristics of the quasi-optical synthesizer are far superior to the waveguide cavity power combiner. The source array structure is the heart of the entire synthesizer. Its design includes the mutual spacing of radiofrequency radiating elements and their respective orientations, as well as the feeding and dissipation of active devices. However, the advantages and disadvantages of the source matrix design directly affect the main performance of the synthesizer (such as the fundamental power P, the fractional power F, the synthesis efficiency η). Therefore, the design of the source matrix is the key point of this paper. This paper presents the design formulas and analysis methods, introduces the calculation steps of optimization design, determines the specific structure and size of the synthesizer, and finally shows the experimental results and conclusions.