ALMA-北美边带分离SIS混频器的研制
Development of the ALMA-North America Sideband-Separating SIS Mixers
摘要：
随着阿塔卡马大型毫米/亚毫米阵列（ALMA）接近完成，73个双极化接收机已交付给每个波段3（84-116 GHz）和6（211-275 GHz）。接收机使用边带分离超导Nb/Al-AlOx/Nb隧道结（SIS）混频器，为ALMA开发，以抑制图像波段的大气噪声。混频器的设计考虑了动态范围、输入回波损耗和信号到图像转换（这在SIS混频器中可能很重要）。频带3和6中的典型SSB接收机噪声温度分别为30 K和60 K，并且镜像抑制通常为15 dB。
英文摘要：
As the Atacama Large Millimeter/submillimeter Array (ALMA) nears completion, 73 dual-polarization receivers have been delivered for each of Bands 3 (84-116 GHz) and 6 (211-275 GHz). The receivers use sideband-separating superconducting Nb/Al-AlOx/Nb tunnel-junction (SIS) mixers, developed for ALMA to suppress atmospheric noise in the image band. The mixers were designed taking into account dynamic range, input return loss, and signal-to-image conversion (which can be significant in SIS mixers). Typical SSB receiver noise temperatures in Bands 3 and 6 are 30 K and 60 K, resp., and the image rejection is typically 15 dB.
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