无线电工程

采用混合集成技术的宽带毫米波接收前端,由于MMIC器件增益或插损在工作频带内存在起伏,导致组件输出增益平坦度较差,可采用增益均衡器来改善组件的平坦度。设计了吸收式的毫米波微带增益均衡器来补偿2级低噪放的增益不平坦度。介绍了增益均衡器的基本原理,利用仿真软件ADS构建电路模型,按步骤进行了优化设计。简要讨论了薄膜电阻的相关设计问题,采用薄膜电路的形式实现了小型化,并最终用HFSS进行了全波仿真验证,设计结果与实测值十分吻合。

Because of the gain and insertion loss of MMIC are not flat in the operating frequency band,broadband millimeter-wave receiving front-end,which uses hybrid-integrated technology,would have unacceptable output gain flatness,the gain equalizer is used to improve the flatness.Absorptive millimeter-wave microstrip gain equalizer is designed to compensate the gain unevenness of the two-stage LNA.The basic principle of the gain equalizer is introduced,its circuit model is built by using ADS and optimized step-by-step.Thin film circuit is adopted to realize miniaturization and the relevant consideration about thin film resistor is discussed briefly.The result is testified by HFSS and shows excellent agreement with the measured data.