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With the development of measurement and control technology, the Ka-band has become an important direction for the development of next-generation satellite communications and millimeter-wave radar. Low-noise amplifiers are core components at the front end of receivers, and their noise temperature directly affects key system indicators such as the receiving sensitivity and action distance of the system. This paper introduces an ultra-low-noise temperature amplifier working in the Ka-band, achieving ultra-wideband, ultra-low noise temperature, miniaturization and generalization. The measured results show that within the frequency range of 26.5～40 GHz, the gain is more than 35 dB, the noise temperature is less than 215 K, and the VSWR is less than 2.38 with the size of 32 mm×19 mm×8 mm.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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