应某雷达系统射频前端提出的对超宽带功分器的应用需求,文中提出一种基于多节Wilkinson结构的超宽带功分器,并使用ADS与HFSS软件进行仿真设计。首先利用ADS软件快速综合出功分器的初始尺寸,然后在HFSS软件中进行精确的仿真和优化,在此...应某雷达系统射频前端提出的对超宽带功分器的应用需求,文中提出一种基于多节Wilkinson结构的超宽带功分器,并使用ADS与HFSS软件进行仿真设计。首先利用ADS软件快速综合出功分器的初始尺寸,然后在HFSS软件中进行精确的仿真和优化,在此基础上进行了实验验证,测试结果表明该功分器在2~12 GHz工作频率内,插入损耗小于5d B,端口回波损耗大于10 d B,输出隔离度大于20 d B。展开更多
A good design of LNA for S band satellite navigation receivers and 4G LTE wireless communication system has been implemented in this paper.Due to increased congestion in the present L band,the S Band frequency from 24...A good design of LNA for S band satellite navigation receivers and 4G LTE wireless communication system has been implemented in this paper.Due to increased congestion in the present L band,the S Band frequency from 2483.5-2500 MHz has been allocated for the future satellite navigation systems.For this purpose ATF-34143 amplifier(pHEMT)having high electron mobility and fast switching response has been chosen due to its very low Noise Figure(NF).The amplifier has been designed having bandwidth of 0.8 GHz from 1.8-2.6 GHz.Because of the large bandwidth,the amplifier could serve many wireless communication applications including 4G LTE mobile communication at 2.1 GHz.The design was implemented using the micro strip technology offering extremely low noise figure of 0.312 dB and 0.377 dB for 2.1 GHz and 2.49 GHz respectively.The gain of the amplifier was low and found to be 10.281 dB and 9.175 dB.For the purpose of increasing the gain of an amplifier,the proposed LNA design was then optimized by using Wilkinson Power Divider(WPD).The Balanced LNA design using WPD offered very low noise figure of 0.422 dB and 0.532 dB respectively and the gain was considerably increased and was found to be 20.087 dB and 17.832 dB respectively against 2.1 GHz and 2.49 GHz.Simulations and measurements were taken in Agilent Advanced Design System(ADS)software.The suggested LNA can be used for a variety of wireless communications applications including the future S band satellite navigation systems.展开更多
针对传统Wilkinson功分器尺寸大且工作频率只局限于基波及其奇次谐波的问题,通过采用级联两条不同特性阻抗的周期性电容加载的传输线代替传统的1/4波长阻抗变换器,并结合RLC并联谐振网络,设计一种适用于任意两个频率的Wilkinson功分器,...针对传统Wilkinson功分器尺寸大且工作频率只局限于基波及其奇次谐波的问题,通过采用级联两条不同特性阻抗的周期性电容加载的传输线代替传统的1/4波长阻抗变换器,并结合RLC并联谐振网络,设计一种适用于任意两个频率的Wilkinson功分器,从而显著减小了功分器的尺寸。最后基于FR4基板,设计应用于900 MHz和1.8 GHz的双频Wilkin-son功分器。测量结果显示,功分器的三端口电路匹配良好,在900 MHz,S11约为-25 d B,S22约为-26 d B,S21约为-3.23 d B;在1.8 GHz,S11约为-23 d B,S22约为-17.5 d B,S21约为-3.39 d B;在两个频点下,输出端口的隔离度分别为-27 d B和-23 d B,仿真结果和测量结果吻合,验证了该方法的可行性和实用性。展开更多
文摘应某雷达系统射频前端提出的对超宽带功分器的应用需求,文中提出一种基于多节Wilkinson结构的超宽带功分器,并使用ADS与HFSS软件进行仿真设计。首先利用ADS软件快速综合出功分器的初始尺寸,然后在HFSS软件中进行精确的仿真和优化,在此基础上进行了实验验证,测试结果表明该功分器在2~12 GHz工作频率内,插入损耗小于5d B,端口回波损耗大于10 d B,输出隔离度大于20 d B。
文摘A good design of LNA for S band satellite navigation receivers and 4G LTE wireless communication system has been implemented in this paper.Due to increased congestion in the present L band,the S Band frequency from 2483.5-2500 MHz has been allocated for the future satellite navigation systems.For this purpose ATF-34143 amplifier(pHEMT)having high electron mobility and fast switching response has been chosen due to its very low Noise Figure(NF).The amplifier has been designed having bandwidth of 0.8 GHz from 1.8-2.6 GHz.Because of the large bandwidth,the amplifier could serve many wireless communication applications including 4G LTE mobile communication at 2.1 GHz.The design was implemented using the micro strip technology offering extremely low noise figure of 0.312 dB and 0.377 dB for 2.1 GHz and 2.49 GHz respectively.The gain of the amplifier was low and found to be 10.281 dB and 9.175 dB.For the purpose of increasing the gain of an amplifier,the proposed LNA design was then optimized by using Wilkinson Power Divider(WPD).The Balanced LNA design using WPD offered very low noise figure of 0.422 dB and 0.532 dB respectively and the gain was considerably increased and was found to be 20.087 dB and 17.832 dB respectively against 2.1 GHz and 2.49 GHz.Simulations and measurements were taken in Agilent Advanced Design System(ADS)software.The suggested LNA can be used for a variety of wireless communications applications including the future S band satellite navigation systems.
文摘针对传统Wilkinson功分器尺寸大且工作频率只局限于基波及其奇次谐波的问题,通过采用级联两条不同特性阻抗的周期性电容加载的传输线代替传统的1/4波长阻抗变换器,并结合RLC并联谐振网络,设计一种适用于任意两个频率的Wilkinson功分器,从而显著减小了功分器的尺寸。最后基于FR4基板,设计应用于900 MHz和1.8 GHz的双频Wilkin-son功分器。测量结果显示,功分器的三端口电路匹配良好,在900 MHz,S11约为-25 d B,S22约为-26 d B,S21约为-3.23 d B;在1.8 GHz,S11约为-23 d B,S22约为-17.5 d B,S21约为-3.39 d B;在两个频点下,输出端口的隔离度分别为-27 d B和-23 d B,仿真结果和测量结果吻合,验证了该方法的可行性和实用性。
