提出了一种基于模式匹配法的窄带Iris波导滤波器设计方法,通过引入Matlab优化使滤波器设计周期缩短了约1/3。设计的窄带滤波器相对带宽小于3%,且较好的克服了毫米波频段滤波器高频端带外抑制较差的难题。测试结果表明,该带通滤波器插入...提出了一种基于模式匹配法的窄带Iris波导滤波器设计方法,通过引入Matlab优化使滤波器设计周期缩短了约1/3。设计的窄带滤波器相对带宽小于3%,且较好的克服了毫米波频段滤波器高频端带外抑制较差的难题。测试结果表明,该带通滤波器插入损耗小于0.8 d B,驻波比小于1.2,中心频率34.86 GHz,带外抑制52 d B@36.5 GHz,已被成功应用于某毫米波雷达通信系统中。展开更多
针对某型号设备需要,设计了一种Ka频段高功率、超窄带滤波器,采用圆波导高次模结构,利用耦合矩阵系数法,结合三维电磁场仿真对滤波器进行了分析,优化出结构尺寸,给出了该滤波器的仿真结果,并对该滤波器在常压和真空环境下所能承受的功...针对某型号设备需要,设计了一种Ka频段高功率、超窄带滤波器,采用圆波导高次模结构,利用耦合矩阵系数法,结合三维电磁场仿真对滤波器进行了分析,优化出结构尺寸,给出了该滤波器的仿真结果,并对该滤波器在常压和真空环境下所能承受的功率进行了近似分析,最终设计了一款相对带宽约0.1%的Ka频段高功率超窄带带通滤波器,经过调试,整个通带插入损耗小于0.4 d B,带内驻波小于1.25,带内平坦度小于0.2 d B,与仿真计算结果基本一致。展开更多
Colonic mucosa-associated lymphoid tissue(MALT)lymphomas are a rare occurrence and the definitive treatment has not been established.Solitary or multiple,elevated or polypoid lesions are the usual appearances of MALT ...Colonic mucosa-associated lymphoid tissue(MALT)lymphomas are a rare occurrence and the definitive treatment has not been established.Solitary or multiple,elevated or polypoid lesions are the usual appearances of MALT lymphoma in the large intestine and sometimes the surface may reveal abnormal vascularity.Herein,we report a case of MALT lymphoma and review the relevant literature.Upon colonoscopy,a suspected pathologic lesion was observed in the proximal transverse colon.The lesion could be distinguished more prominently after using narrowband imaging mode and indigo carmine-dye spraying chromoendoscopy.Histopathologic examination of this biopsy specimen revealed lymphoepithelial lesions with diffuse proliferation of atypical lymphoid cells effacing the glandular architecture and centrocyte-like cellsinfiltrating the lamina propria.Immunohistochemical analyses showed that tumor cells were positive for CD20 and Bcl-2e,and negative for CD10,CD23,and Bcl-6.According to Ann-Arbor staging system,the patient had stage IIE.A partial colectomy with dissection of the paracolic lymph nodes was performed.Until now,there is no recurrence of lymphoma at follow-up.展开更多
文摘提出了一种基于模式匹配法的窄带Iris波导滤波器设计方法,通过引入Matlab优化使滤波器设计周期缩短了约1/3。设计的窄带滤波器相对带宽小于3%,且较好的克服了毫米波频段滤波器高频端带外抑制较差的难题。测试结果表明,该带通滤波器插入损耗小于0.8 d B,驻波比小于1.2,中心频率34.86 GHz,带外抑制52 d B@36.5 GHz,已被成功应用于某毫米波雷达通信系统中。
文摘针对某型号设备需要,设计了一种Ka频段高功率、超窄带滤波器,采用圆波导高次模结构,利用耦合矩阵系数法,结合三维电磁场仿真对滤波器进行了分析,优化出结构尺寸,给出了该滤波器的仿真结果,并对该滤波器在常压和真空环境下所能承受的功率进行了近似分析,最终设计了一款相对带宽约0.1%的Ka频段高功率超窄带带通滤波器,经过调试,整个通带插入损耗小于0.4 d B,带内驻波小于1.25,带内平坦度小于0.2 d B,与仿真计算结果基本一致。
文摘Colonic mucosa-associated lymphoid tissue(MALT)lymphomas are a rare occurrence and the definitive treatment has not been established.Solitary or multiple,elevated or polypoid lesions are the usual appearances of MALT lymphoma in the large intestine and sometimes the surface may reveal abnormal vascularity.Herein,we report a case of MALT lymphoma and review the relevant literature.Upon colonoscopy,a suspected pathologic lesion was observed in the proximal transverse colon.The lesion could be distinguished more prominently after using narrowband imaging mode and indigo carmine-dye spraying chromoendoscopy.Histopathologic examination of this biopsy specimen revealed lymphoepithelial lesions with diffuse proliferation of atypical lymphoid cells effacing the glandular architecture and centrocyte-like cellsinfiltrating the lamina propria.Immunohistochemical analyses showed that tumor cells were positive for CD20 and Bcl-2e,and negative for CD10,CD23,and Bcl-6.According to Ann-Arbor staging system,the patient had stage IIE.A partial colectomy with dissection of the paracolic lymph nodes was performed.Until now,there is no recurrence of lymphoma at follow-up.
