超导带通滤波器产生的三音互调失真
Three-Tone Intermodulation Distortion Generated by Superconducting Bandpass Filters
摘要：
由表现出某种非线性的材料（如超导体）构成的微波带通滤波器，当受到多个频率的信号时会产生互调失真（IMD）。在中频接收滤波器的商业应用中，当弱接收信号与非常强的带外信号（例如来自发射机的信号）混合时，可能会生成IMD。开发了一种测量程序，并对几种不同类型的超导带通滤波器进行了数据采集，所有这些都是为商业应用而开发的。已经发现，在某些干扰情况下，3音混合可以产生接收器可察觉的杂散，但是存在简单的预防性设计解决方案。
英文摘要：
Microwave bandpass filters constructed from materials exhibiting some nonlinearity, such as superconductors, will generate intermodulation distortion (IMD) when subjected to signals at more than one frequency. In commercial applications of superconductive receive filters, it is possible for IMD to be generated when a weak receive signal mixes with very strong out-of-band signals, such as those coming from the transmitter. A measurement procedure was developed and data were taken on several different types of superconducting bandpass filters, all developed for commercial application. It was found that in certain interference situations, the 3-tone mixing can produce a spur that is noticeable by the receiver, but that there are simple preventative design solutions.
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