中文摘要：

设计与实现了一种在2.4 GHz和5.8 GHz工作的双频带低噪声放大器。以共基-共射电路作为增益级,引入一个增益增强级电路,减小PCB传输线损耗;利用峰化电感和RC网络来补偿在高频下的增益下降;采用π-型微带线来取得输入和输出的良好匹配。结果表明,在2.4 GHz和5.8 GHz两点上,增益S21分别为15 dB和13 dB,噪声系数为3.6 dB和4.5 dB,S11和S22的模拟与实测结果均小于-10 dB。

英文摘要：

A dual-band low noise amplifier（DBLNA）, which can operate at 2.4 GHz and 5.8 GHz, is designed and realized. A common-base common-emitter circuit structure is employed as gain stage to achieve wider bandwidth. In order to compensate the loss of transmission line and the PCB process error, a gain enhancement circuit is intro- duced. Meanwhile,a RC circuit and matching inductor are used to improve the gain at high frequency. A w-type micro-strip line structure is designed to achieve input and output matching. The results show that at the 2.4 GHz and 5.8 GHz,the S21 are 15 dB and 13 dB respectively,noise factor are 3.6 dB and 4.5 dB respectively,both of simulation and test result of S11 and S22 are below -10 dB.