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已经研制了一种20—25GHz 和29—35GHz 频率范围内的金红石行波量子放大器。本文给出了掺铁金红石的最佳数据,并确定了最佳的掺铁浓度。在10—50GHz 频率范围内,特别有用的一种新型介质镜象线慢波结构已经用于其中二个量子放大器。这种慢波结构的性能比所试验过的其它结构,如介质加载波导更为优越。对于这两类量子放大器,都使用了铁氧体隔离器以保证在30分贝净增益时,增益稳定性优于±0.2分贝,这是射电天文使用所要求的。各个量子放大器的三分贝瞬时带宽为30—60兆赫。在输入波导法兰处测量得量子放大器的噪声温度为27±4K
A rutile traveling-wave quantum amplifier in the 20-25 GHz and 29-35 GHz frequency ranges has been developed. This paper presents the best data for iron-doped rutile and determines the optimum iron concentration. A new type of dielectric mirror line slow-wave architecture that is particularly useful in the 10-50 GHz frequency range has been used for two of these quantum amplifiers. The performance of this slow-wave structure is superior to other structures tested, such as dielectric-loaded waveguides. For both types of quantum amplifiers, a ferrite isolator is used to ensure gain stability of better than ± 0.2 dB at a net gain of 30 dB, which is required for radio astronomy use. The three decibels of each quantum amplifier has an instantaneous bandwidth of 30-60 MHz. The measured noise temperature of the quantum amplifier at the input waveguide flange is 27 ± 4K