文中介绍了一种新型的RF MEMS可调帯阻滤波器。该滤波器是通过在共面波导地结构上刻蚀出缺陷地结构,形成基本谐振单元;再通过加入RF MEMS开关,实现可调滤波器。分析了滤波器的结构参数和RF MEMS开关与竖向槽的关系。可调帯阻滤波器制作...文中介绍了一种新型的RF MEMS可调帯阻滤波器。该滤波器是通过在共面波导地结构上刻蚀出缺陷地结构,形成基本谐振单元;再通过加入RF MEMS开关,实现可调滤波器。分析了滤波器的结构参数和RF MEMS开关与竖向槽的关系。可调帯阻滤波器制作在高阻硅（εr=11.9）基板上,厚度为460μm;表面金属材料为铝,厚度为2μm。该滤波器实现了14-18 GHz可调,可调范围约为30%;中心频点处对应的回波损耗大于-2 d B,插入损耗小于-35 d B;10 d B带宽大于8.6 GHz。展开更多
This paper proposes a printed log-periodic dipole antenna (LPDA) for ultra wide bandwidth (UWB) applications. The antenna comprises of cascading four U shaped elements of different line lengths with balun circuit to i...This paper proposes a printed log-periodic dipole antenna (LPDA) for ultra wide bandwidth (UWB) applications. The antenna comprises of cascading four U shaped elements of different line lengths with balun circuit to improve the antenna impedance matching. The proposed antenna dimensions are 50 × 50 mm2 with FR4 substrate thickness 0.8 mm. Full-wave EM solver HFSS (High Frequency Structure Simulator) is used for modeling the proposed antenna. The pulse distortion is verified by the measured the proposed antenna performance with virtually steady group delay. The simulation and experimental results show that the proposed antenna exhibits good impedance matching, stable radiation patterns throughout the whole operating frequency bands, acceptable gain and stable group delay over the entire operating band. An UWB extended from 1.85 GHz to 11 GHz is obtained, and the average antenna gain is about 5.5 dBi over the operating band with peak gain around 6.5 dBi and 70% average radiation efficiency.展开更多
文摘文中介绍了一种新型的RF MEMS可调帯阻滤波器。该滤波器是通过在共面波导地结构上刻蚀出缺陷地结构,形成基本谐振单元;再通过加入RF MEMS开关,实现可调滤波器。分析了滤波器的结构参数和RF MEMS开关与竖向槽的关系。可调帯阻滤波器制作在高阻硅（εr=11.9）基板上,厚度为460μm;表面金属材料为铝,厚度为2μm。该滤波器实现了14-18 GHz可调,可调范围约为30%;中心频点处对应的回波损耗大于-2 d B,插入损耗小于-35 d B;10 d B带宽大于8.6 GHz。
文摘This paper proposes a printed log-periodic dipole antenna (LPDA) for ultra wide bandwidth (UWB) applications. The antenna comprises of cascading four U shaped elements of different line lengths with balun circuit to improve the antenna impedance matching. The proposed antenna dimensions are 50 × 50 mm2 with FR4 substrate thickness 0.8 mm. Full-wave EM solver HFSS (High Frequency Structure Simulator) is used for modeling the proposed antenna. The pulse distortion is verified by the measured the proposed antenna performance with virtually steady group delay. The simulation and experimental results show that the proposed antenna exhibits good impedance matching, stable radiation patterns throughout the whole operating frequency bands, acceptable gain and stable group delay over the entire operating band. An UWB extended from 1.85 GHz to 11 GHz is obtained, and the average antenna gain is about 5.5 dBi over the operating band with peak gain around 6.5 dBi and 70% average radiation efficiency.
