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本文从理论上阐明了低温冷却肖特基位垒混频器,在其转换损失仅略有增加的情况下,获得了相当可观的噪声减小。直流偏压和本地振荡器的振荡必须适量。实验结果表明它与冷参放中频放大器,单边带接收机连接时,目前在85GC的频率上获得约350K的噪声温度;在33GC的频率上获得够260K噪声温度是可能的。这与当前的室温混频器接收机相比较,在85GC的频率上获得了5倍的噪声温度改善,在33GC的频率上获得了3倍的噪声温度改善。在二极管内还观察到一种无法解释的噪声源,如果能消除此噪声源,噪声温度可进一步获得一倍改善。
In this paper, the low-temperature Schottky barrier mixer is theoretically demonstrated, and a considerable noise reduction is obtained with only a slight increase of the conversion loss. DC bias and local oscillator oscillation must be modest. The experimental results show that when it is connected with the cold-amplifier IF amplifier and the single-sideband receiver, the current noise temperature of about 350K is obtained at the frequency of 85GC; it is possible to obtain the temperature of 260K at 33GC. This gives a 5x improvement in noise temperature at 85GC compared to the current room temperature mixer receiver and a 3x improvement in noise temperature at 33GC. An unexplained source of noise is also observed within the diode, and the noise temperature can be further doubled if this source of noise can be eliminated.