SWEPT HETRODYNE NETWORK MAGNITUDE ANALYZER FOR MILLIMETER-WAVE ANALYSIS

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 毫米波分量和网络功率（矢量幅度）响应的宽带测量对于我们的HF光谱仪中的电桥设计改进的快速评估和发展是理想的。然而，目前还没有相对低成本的这种类型的系统存在于W波段和更高的毫米波长的研究。因此，我们设计了一种新型的多功能扫频幅度响应评估装置，并考虑将这种仪器组装成可在95，170，240和250 GHz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，有效和相对便宜的方法来进行这种测量，并且为了经济，是基于使用我们中心目前手头上的几种仪器和组件。对于每个毫米波段，我们建议结合联合收割机的传统频谱分析仪和它的同伴跟踪发生器与适当的锁相源，并与波导谐波混频器，PLDRO和几个标准的微波组件，实现经济，但高性能的标量网络分析仪。 我们的设计是独一无二的，因为它是基于并提供了具有成本效益的，高动态范围块转换器概念的性能优势，在这种情况下，与毫米波源相结合，这是锁相到传统的频谱分析仪/跟踪发生器。这种配对使我们能够通过更高的毫米波频段实现具有特殊能力的仪器。 我们只需要构建一个快速分频器（或者替代频率特定的PLDRO）和混频器部分，因为所有其他子系统都在或将在手边。在170 GHz的规格是：扫描跨度为10.0 GHz，动态范围为75 dB，分辨率为20 KHz。其他毫米波段的解决办法是适当的源模块和波导谐波混频器的替代。在随后的中心更新赠款期间，将继续根据这一新设计建造扫频毫米波分析仪。

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.