排序方式: 共有2条查询结果,搜索用时 0 毫秒
1
1.
Zhang Xu Liu Jia Chen ChuangYe Liu Wei Liu JingBin Li BaoHui He Ming Zhou TieGe Zhao XinJie Yan ShaoLin Fang Lan 《科学通报(英文版)》2011,56(35):3884-3887
A new circuit model for designing and manufacturing an S-band low noise amplifier(LNA) with the software,Advanced Design System(ADS),is introduced in this paper.The proposed model involves shunted impedance at the grid to achieve a stable LNA without measuring the S-parameters of transistors at low temperatures.The LNA was measured over the operation band of 2.2-2.3 GHz,which has input and output standing wave ratios below 1.2.The noise figure of the manufactured LNA was about 0.2 dB and the gain was above 22 dB,which indicated that our LNA worked well at 77 K. 相似文献
2.
HouHai Xia ChunXia Zhou Tao Zuo Ming He Lu Ji TieGe Zhou XinJie Zhao Lan Fang ShaoLin Yan 《科学通报(英文版)》2009,54(19):3596-3599
This paper represents the development of a high temperature superconducting (HTS) filter, the highest operating temperature of which is up to 93 K. The filter is designed for S band with 4% fractional bandwidth and fabricated using thallium-barium-calcium-copper oxide (TI2Ba2CaCu2O8) thin films. At 93 K, the measurements of the filter show that the insertion loss in the passband is less than 0.22 dB, the return loss is better than 20 dB, and the out-of-band rejection is more than 80 dB. The analysis on the characteristics of the filter operating at different temperatures shows that the filter can work well at temperatures around 90 K. The temperature of 93 K is the highest among the previous reports for HTS filters. The result reported in this paper is significant for HTS filters to be used in the field of microwave communication requiring high sensitivity. 相似文献
1