一种Ku波段低噪声放大器的设计

Design of a Ku-band Low Noise Amplifier

基于ADS和HFSS电磁仿真软件,设计了一种Ku波段低噪声放大器。放大器包含波导-微带转换单元和低噪声放大器两部分。波导-微带转换单元采用体积小,性能优良的微带探针型过渡,为提高转换性能和带宽,采用二阶λ/4阻抗变换结构来实现50Ω微带线与微带探针之间的阻抗匹配。低噪声放大器选用CDK公司生产的具有超低噪声和高增益的FET器件CKRF7512CK24晶体管,采用偏置电路、最小噪声匹配及最大输出增益匹配相结合的方案,实现了低噪声和高增益。实测结果表明,在11.5GHz~13.5GHz的频率范围内,该低噪声放大器的输入输出回波损耗均小于-10dB,噪声系数小于0.8dB。

Based on ADS and HFSS electromagnetic simulation software,a Ku band low noise amplifier is designed.The amplifier consists of waveguide microstrip transition unit and low noise amplification.The waveguide microstrip transition element adopts the microstrip probe type transition with small volume and excellent performance.In order to improve the conversion performance and bandwidth,the second-orderλ/4 impedance transformation structure to realize the impedance matching between 50Ωmicrostrip line and microstrip probe.The low noise amplifier adopts the FET device CKRF7512 CK24 transistor with ultra-low noise and high gain produced by CDK company.The scheme of combining bias circuit,minimum noise matching and maximum output gain matching is adopted to realize low noise and high gain.The measurement results show that in the frequency range of 11.5 GHz~13.5 GHz,the input and output return loss of the low noise amplifier is less than-10 dB,the noise coefficient is less than 0.8 dB.