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本文介绍了一种行波量子放大器,它被安装在 Amherst,MA.附近的五个学院联合射电天文观测站13.7米天线的毫米波射电望远镜上。该量子放大器用掺铁金红石作为激活材料,样机在85—90GHz 频率范围内,在整个140MC 的瞬时带宽内达到了15dB的电子增益。本文对窄缝馈电镜象波导方式的使用进行了分析和说明,用这种方式可使带宽很宽的电磁波耦合到顺磁晶体中去。由于使用了这个量子放大器,可使整个系统的噪声温度减小到低于100K(包括大气噪声),这就可以使系统灵敏度提高一个数量级。
This article describes a traveling-wave quantum amplifier mounted on a millimeter-wave radio telescope at a 13.7-meter antenna of five academies affiliated with Radio Astronomy Observatory near Amherst, MA. The quantum amplifier uses iron-doped rutile as the active material. The prototype achieves an electronic gain of 15 dB over the instantaneous bandwidth of the 140MC in the 85-90 GHz frequency range. In this paper, the use of narrow slot feeding mirror waveguide is analyzed and explained. In this way, a very wide bandwidth electromagnetic wave can be coupled to the paramagnetic crystal. Thanks to the use of this quantum amplifier, the overall system noise temperature can be reduced to less than 100K (including atmospheric noise), which can increase system sensitivity by an order of magnitude.