SWEPT HETRODYNE NETWORK MAGNITUDE ANALYZER FOR MILLIMETER-WAVE ANALYSIS

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 毫米波分量和网络功率(矢量值)响应的宽带测量对于快速评估和改进我们的高频光谱仪的电桥设计改进是可取的。然而，目前还不存在用于W波段和更高频段的毫米波研究的这种类型的相对低成本的系统。因此，我们设计了一种新型的多功能扫频震级响应评估装置，并考虑将该仪器组装成可在95、170、240和250 GHz我们的信号源的毫米频率范围内使用的形式。我们的初步设计是一种简单、有效和相对便宜的测量方法，为了经济起见，我们基于我们中心目前手头的几种仪器和部件的使用。对于每个毫米波频段，我们建议将传统的频谱分析仪及其配套的跟踪发生器与合适的锁相源相结合，并结合波导型谐波混频器、PLDRO和几种标准的微波元件，实现了一种经济但高性能的标量网络分析仪。 我们的设计是独一无二的，因为它基于经济高效的高动态范围块转换器概念，并提供了性能优势，在这种情况下，它与锁相到传统频谱分析仪/跟踪发生器的毫米波源相结合。这种配对使我们能够通过更高的毫米波频段实现性能出众的仪器。我们只需要构造一个快速分频器(或者，替代一个特定于频率的PLDRO)和混频部分，因为所有其他子系统都在或将在附近。170 GHz的规格为：扫描范围为10.0 GHz，动态范围为75db，分辨率为20 kHz。其他毫米波频段将通过替换适当的源模块和波导谐混频器来解决。在随后的中心续期赠款期间，将继续建造基于这一新设计的扫频毫米波分析器。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Wideband measurement of millimeter-wave components and network power (vector magnitude) response is desirable for rapid evaluation and evolution of bridge design improvement in our HF spectrometers. However, no relatively low-cost system of this type presently exists for millimeter-wavelength studies at W-band and higher. Therefore, we have designed a new type of versatile swept magnitude-response evaluation set and contemplate assembling this instrument in a form usable over the millimeter-frequency ranges of our sources at 95, 170, 240 and 250GHz. Our preliminary design is a straightforward, effective and relatively inexpensive approach to such measurements, and, for economy, is based the use of several instruments and components presently on hand at our Center. For each millimeter-wave band, we propose to combine a conventional spectrum analyzer and its companion tracking generator with a appropriate phase-locked source, and, with a waveguide harmonic mixer, PLDRO and several standard microwave components, realize an economical but high-performance scalar network analyzer. Our design is unique in that it is based on and offers the performance advantages of the cost-effective, high-dynamic range block converter concept, in this case combined with a millimeter-wave source which is phase-locked to the conventional spectrum analyzer/tracking generator. This pairing allows us to realize an instrument of exceptional capability through the higher millimeter-wave frequency bands. We will only need to construct a fast divider (or, alternatively, substitute a frequency-specific PLDRO) and the mixer sections, since all other sub-systems are, or will be, on hand. Specifications at 170GHz are: sweep span of 10.0GHz and a dynamic range of 75dB for 20KHz resolution. Other millimeter-wave bands are to be addressed by substitution of appropriate source modules and waveguide-harmonic-mixers. Construction of a swept millimeter-wave analyzer based on this new design will be continued during the ensuing Center renewal grant period.