A unified breakdown model of SOI RESURF device with uniform,step,or linear drift region doping profile is firstly proposed.By the model,the electric field distribution and breakdown voltage are researched in detail fo...A unified breakdown model of SOI RESURF device with uniform,step,or linear drift region doping profile is firstly proposed.By the model,the electric field distribution and breakdown voltage are researched in detail for the step numbers from 0 to infinity.The critic electric field as the function of the geometry parameters and doping profile is derived.For the thick film device,linear doping profile can be replaced by a single or two steps doping profile in the drift region due to a considerable uniformly lateral electric field,almost ideal breakdown voltage,and simplified design and fabrication.The availability of the proposed model is verified by the good accordance among the analytical results,numerical simulations,and reported experiments.展开更多
A novel dual-band planar microstrip filter using parallel coupled microstrip lines and open-loop stepped-impedance resonators（SIRs）loaded with two shunt open stubs is presented.By tuning the physical lengths of open...A novel dual-band planar microstrip filter using parallel coupled microstrip lines and open-loop stepped-impedance resonators（SIRs）loaded with two shunt open stubs is presented.By tuning the physical lengths of open-loop SIRs,parallel coupled microstrip lines and two stubs,the bandpass filter has good dual-passband performance at 2.55 and 5.35 GHz and high isolation between the two passbands.The relative bandwidths of the two passbands are 11.8% and 16.8%,respectively.Compared with the conventional open-loop SIR filters,the designed filter has a comparatively broader fractional bandwidth at the second passband.So it can cover all the wireless LAN（local area network）bands.In addition,the filter has the features of low loss,high rejection and low ripple.The measured results are in good agreement with the simulated responses by HFSS software.展开更多
设计了一个毫米波频段的宽带功率均衡器与固态功率驱动模块。通过对用于驱动模块的功率均衡器进行改进,提出了一种新型的微带阶梯阻抗谐振线的功率均衡器结构,这种结构频带宽,驻波好,结构紧凑。为了验证其性能,加工实物并进行测试,测试...设计了一个毫米波频段的宽带功率均衡器与固态功率驱动模块。通过对用于驱动模块的功率均衡器进行改进,提出了一种新型的微带阶梯阻抗谐振线的功率均衡器结构,这种结构频带宽,驻波好,结构紧凑。为了验证其性能,加工实物并进行测试,测试结果表明,均衡器在32 GHz^40 GHz宽带频段,其最小插入损耗小于3.3 d B,回波损耗优于13 d B,均衡量9 d B。固态功率驱动模块采用2级放大器,且均衡器后置,布局合理。测试结果表明,在32 GHz^40 GHz,功率均衡精确度优于2 d B,输出功率更为准确,实现了固态驱动模块的小型化设计。展开更多
This paper deals with the problem of stabilization design for a class of continuous-time Takagi-Sugeno（T-S）fuzzy systems.New stabilization conditions are derived based on a relaxed approach in which both fuzzy Lyapu...This paper deals with the problem of stabilization design for a class of continuous-time Takagi-Sugeno（T-S）fuzzy systems.New stabilization conditions are derived based on a relaxed approach in which both fuzzy Lyapunov functions and staircase membership functions are used.Through the staircase membership functions approximating the continuous membership functions of the given fuzzy model,the information of the membership functions can be brought into the stabilization design of the fuzzy systems,thereby significantly reducing the conservativeness in the existing stabilization conditions of the T-S fuzzy systems.Unlike some previous fuzzy Lyapunov function approaches reported in the literature,the proposed stabilization conditions do not depend on the time-derivative of the membership functions that may be the main source of conservatism when considering fuzzy Lyapunov functions analysis.Moreover,conditions for the solvability of the controller design are written in the form of linear matrix inequalities,but not bilinear matrix inequalities,which are easier to be solved by convex optimization techniques.A simulation example is given to demonstrate the validity of the proposed approach.展开更多
基于微带方形环谐振器,采用一种新的微扰方式来实现奇偶模分裂,并对其模式分裂机制进行分析。采用阶梯阻抗微带线结构实现输入/输出与双模谐振器之间的强耦合,构成了宽带带通滤波器。测试结果表明,该滤波器中心频率为4.9 7 G H z,通带...基于微带方形环谐振器,采用一种新的微扰方式来实现奇偶模分裂,并对其模式分裂机制进行分析。采用阶梯阻抗微带线结构实现输入/输出与双模谐振器之间的强耦合,构成了宽带带通滤波器。测试结果表明,该滤波器中心频率为4.9 7 G H z,通带内最小插损为1.3 3 d B,3 d B相对带宽为2 4.7 5%,并且具有准椭圆函数响应,改善了阻带抑制特性。展开更多
文摘A unified breakdown model of SOI RESURF device with uniform,step,or linear drift region doping profile is firstly proposed.By the model,the electric field distribution and breakdown voltage are researched in detail for the step numbers from 0 to infinity.The critic electric field as the function of the geometry parameters and doping profile is derived.For the thick film device,linear doping profile can be replaced by a single or two steps doping profile in the drift region due to a considerable uniformly lateral electric field,almost ideal breakdown voltage,and simplified design and fabrication.The availability of the proposed model is verified by the good accordance among the analytical results,numerical simulations,and reported experiments.
基金The National Natural Science Foundation of China(No.60621002,60702027,60921063)the National Basic Research Program of China(973Program)(No.2010CB327400)the National High Technology Research and Development Program of China(863Program)(No.2008ZX03005-001,2008AA01Z223,2009AA011503)
文摘A novel dual-band planar microstrip filter using parallel coupled microstrip lines and open-loop stepped-impedance resonators（SIRs）loaded with two shunt open stubs is presented.By tuning the physical lengths of open-loop SIRs,parallel coupled microstrip lines and two stubs,the bandpass filter has good dual-passband performance at 2.55 and 5.35 GHz and high isolation between the two passbands.The relative bandwidths of the two passbands are 11.8% and 16.8%,respectively.Compared with the conventional open-loop SIR filters,the designed filter has a comparatively broader fractional bandwidth at the second passband.So it can cover all the wireless LAN（local area network）bands.In addition,the filter has the features of low loss,high rejection and low ripple.The measured results are in good agreement with the simulated responses by HFSS software.
文摘设计了一个毫米波频段的宽带功率均衡器与固态功率驱动模块。通过对用于驱动模块的功率均衡器进行改进,提出了一种新型的微带阶梯阻抗谐振线的功率均衡器结构,这种结构频带宽,驻波好,结构紧凑。为了验证其性能,加工实物并进行测试,测试结果表明,均衡器在32 GHz^40 GHz宽带频段,其最小插入损耗小于3.3 d B,回波损耗优于13 d B,均衡量9 d B。固态功率驱动模块采用2级放大器,且均衡器后置,布局合理。测试结果表明,在32 GHz^40 GHz,功率均衡精确度优于2 d B,输出功率更为准确,实现了固态驱动模块的小型化设计。
基金The National Natural Science Foundation of China(No.60764001,60835001,60875035,61004032)the Postdoctoral Research Fund of Southeast Universitythe Natural Science Foundation of Jiangsu Province(No.BK2008294)
文摘This paper deals with the problem of stabilization design for a class of continuous-time Takagi-Sugeno（T-S）fuzzy systems.New stabilization conditions are derived based on a relaxed approach in which both fuzzy Lyapunov functions and staircase membership functions are used.Through the staircase membership functions approximating the continuous membership functions of the given fuzzy model,the information of the membership functions can be brought into the stabilization design of the fuzzy systems,thereby significantly reducing the conservativeness in the existing stabilization conditions of the T-S fuzzy systems.Unlike some previous fuzzy Lyapunov function approaches reported in the literature,the proposed stabilization conditions do not depend on the time-derivative of the membership functions that may be the main source of conservatism when considering fuzzy Lyapunov functions analysis.Moreover,conditions for the solvability of the controller design are written in the form of linear matrix inequalities,but not bilinear matrix inequalities,which are easier to be solved by convex optimization techniques.A simulation example is given to demonstrate the validity of the proposed approach.
文摘基于微带方形环谐振器,采用一种新的微扰方式来实现奇偶模分裂,并对其模式分裂机制进行分析。采用阶梯阻抗微带线结构实现输入/输出与双模谐振器之间的强耦合,构成了宽带带通滤波器。测试结果表明,该滤波器中心频率为4.9 7 G H z,通带内最小插损为1.3 3 d B,3 d B相对带宽为2 4.7 5%,并且具有准椭圆函数响应,改善了阻带抑制特性。
