The paper presents an original physical points of an intellectual CAD system designing for three-tier wide band waveguide-dielectric filters with LM modes. On the basis of formalized physical knowledge about the behav...The paper presents an original physical points of an intellectual CAD system designing for three-tier wide band waveguide-dielectric filters with LM modes. On the basis of formalized physical knowledge about the behavior of coupled resonators, the CAD system analyses electromagnetic signal passing through a filter structure and makes decisions gradually approaching the optimal filter design through a series of changes in its geometry. From a mathematical point of view, this approach is an alternative to well-known optimization methods and is also very promising for solving the problem of finding a global extremum of an objective function. We also include the filter optimization results obtained with the CAD system for the frequency range 23 - 81 GHz, band widths up to 30% and insertion losses less than 0.5 dB.展开更多
基于传统阶跃阻抗滤波器,提出了一种易于实现的超宽阻带微带低通滤波器改进设计方案。低阻抗线部分采用扇形微带结构,在同等阶数下,该结构的滤波器与传统阶跃阻抗滤波器相比,具有更紧凑的电路结构以及更好的阻带特性。在滤波器末端并联...基于传统阶跃阻抗滤波器,提出了一种易于实现的超宽阻带微带低通滤波器改进设计方案。低阻抗线部分采用扇形微带结构,在同等阶数下,该结构的滤波器与传统阶跃阻抗滤波器相比,具有更紧凑的电路结构以及更好的阻带特性。在滤波器末端并联开路短截线,使得阻带增加额外传输陷波点来抑制寄生通带。利用ADS和HFSS仿真软件对滤波器结构进行优化设计,并进行了实物的加工和测试。实测结果表明,通带3 d B截止频率为2 GHz,通带内0～1.8 GHz回波损耗大于20 d B,3～20 GHz频率范围内的阻带抑制能达到25 d B以上。展开更多
设计了一种加载集总电阻的单极化低频透射吸波型频率选择表面(absorptive frequency selective surface,AFSS).该结构由二维有耗频率选择表面(FSS)阻抗屏和三维带阻FSS级联组成.利用集总电阻加载的容性FSS和高选择性的三维宽阻带FSS实...设计了一种加载集总电阻的单极化低频透射吸波型频率选择表面(absorptive frequency selective surface,AFSS).该结构由二维有耗频率选择表面(FSS)阻抗屏和三维带阻FSS级联组成.利用集总电阻加载的容性FSS和高选择性的三维宽阻带FSS实现了超宽带通响应以及低剖面、高选择性特性.仿真结果显示设计的吸波型频率选择表面通带为1—3.5 GHz,吸波频段为6.6—11.6 GHz,通带与吸波频段的过渡带比为1.9.最后制作实物进行了实验验证,测试结果与仿真基本一致,充分验证了设计的有效性和正确性.展开更多
文摘The paper presents an original physical points of an intellectual CAD system designing for three-tier wide band waveguide-dielectric filters with LM modes. On the basis of formalized physical knowledge about the behavior of coupled resonators, the CAD system analyses electromagnetic signal passing through a filter structure and makes decisions gradually approaching the optimal filter design through a series of changes in its geometry. From a mathematical point of view, this approach is an alternative to well-known optimization methods and is also very promising for solving the problem of finding a global extremum of an objective function. We also include the filter optimization results obtained with the CAD system for the frequency range 23 - 81 GHz, band widths up to 30% and insertion losses less than 0.5 dB.
文摘基于传统阶跃阻抗滤波器,提出了一种易于实现的超宽阻带微带低通滤波器改进设计方案。低阻抗线部分采用扇形微带结构,在同等阶数下,该结构的滤波器与传统阶跃阻抗滤波器相比,具有更紧凑的电路结构以及更好的阻带特性。在滤波器末端并联开路短截线,使得阻带增加额外传输陷波点来抑制寄生通带。利用ADS和HFSS仿真软件对滤波器结构进行优化设计,并进行了实物的加工和测试。实测结果表明,通带3 d B截止频率为2 GHz,通带内0～1.8 GHz回波损耗大于20 d B,3～20 GHz频率范围内的阻带抑制能达到25 d B以上。
