Transferred electron oscillators at MM wave frequencies and their characterisation using quasi-optical techniques
Transferred electron oscillators at MM wave frequencies and their characterisation using quasi-optical techniques
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毫米波频率的转移电子振荡器及其使用准光学技术的表征
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发表时间：
1990
期刊：
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通讯作者：
Graham M. Smith
中科院分区：
文献类型：
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作者：
Graham M. Smith
使用在圣安德鲁斯设计和建造的测试台设备，对W频段及以上的高频毫米波振荡器进行了研究。倍频程可调谐振荡器已被设计、制造并用于验证开发的古恩器件，以及为测试台测量系统提供理想的振荡器。这些振荡器已出售给英国各地的许多毫米波实验室。这些振荡器的操作，优化和特性的详细描述，和各种非线性效应的解释和建模成功。宽带调谐和匹配还允许对新开发的古恩器件进行评估，以准确地确定器件的最佳工作频率范围。这是GEe Hirst和MEDL开发计划的一部分，现在已经生产出94 GHz的最先进的GaAs古恩振荡器。大部分的振荡器的特性是使用新的准光学技术，这使得低损耗精确的性能在这些非常高的频率。介绍了几种准光学技术，并给出了许多光学元件的设计、制造和评价。特别地，使用利用频率计数技术的Martin-Puplett干涉仪确定振荡器的频率和谐波含量。这使得宽带测量能够以比传统腔体波长计高得多的精度进行。此外，一个国家的最先进的噪声工作台已被设计和建造的工作在W波段及以上，利用一种新型的开放式谐振器，以实现一个非常高的Q抑制滤波器。该系统已被证明，使噪声测量在更低的功率水平和更大的灵敏度比可比系统。
A study of high frequency millimetre wave oscillators is performed operating at Wband and above, using test bench equipment designed and constructed in St. Andrews. Octave tuneable oscillators have been designed, constructed, and used to characterise developmental Gunn dervices, as well as to provide ideal oscillators for test bench measurement systems. These oscillators have been sold to many millimetre-wave laboratories throughout Britain. The operation, optimisation and characterisation of these oscillators is described in detail, and various non-linear effects are explained and modelled successfully. The wideband tuneability and matching has also allowed evaluation of new developmental Gunn devices to accurately determine the optimum operating frequency range of the devices. This was part of a developmental program by GEe Hirst and MEDL which has now produced state of the art GaAs Gunn oscillators at 94GHz. Much of the characterisation of the oscillators is performed using novel quasioptical techniques, which has allowed low loss accurate performance at these very high frequencies. Several quasi-optical techniques are described and the design, manufacture and evaluation of many optical components are given. In particular, the frequency and harmonic content of the oscillators was determined using a Martin-Puplett Interferometer which utilised a frequency counting technique. This enabled easy wideband measurements to be performed with much greater accuracy than traditional cavity wavcmeters. In addition, a state of the art noise bench has been designed and constructed for operation at W-band and above, that utilises a novel open resonator to effect a very high Q suppression filter. The system has been shown to make noise measurements at much lower power levels and with greater sensitivity than comparable systems.