新型的平面双模椭圆函数带通滤波器

根据传统的方形贴片双模滤波器,提出了一种新颖的带有两个切角的平面双模带通滤波器结构.该结构使用单个贴片谐振器并且没有耦合缝隙,通带两端各有一个衰减极点,有效减小了滤波器的辐射损耗.对该滤波器结构进行改进,又提出了一种带有两个相互正交、长度不等槽线的双模椭圆函数带通滤波器结构.该滤波器在中心频率1.8GHz处,回波损耗达到31.53 dB,通带内最小插损达到0.01 dB,3 dB相对带宽为19.44%.采用Ansotf公司的En-sem ble 8.0仿真软件进行的仿真研究.仿真结果表明该结构可以更加有效地减小辐射损耗,增加带宽,且体积比传统滤波器减小了约40%,有利于小型化.

NOVEL BANDPASS FILTERS OF PLANAR DUAL-MODE ELLIPTIC-FUNCTION

A novel planar dual-mode bandpass filter with double-corner cuts was proposed on the basis of traditional square patch dual-mode filter.The proposed structure has single patch resonator without coupling gaps,and two attenuation poles can be implemented on both sides of passband.The filter can also provide a low loss.An improved novel dual-mode elliptic-function passband filter with a pair of unequal crossed slots was also proposed.The return loss of this filter is 31.53dB at the center frequency of 1.8GHz,and the minimum insertion loss in passband is 0.01dB,and the 3dB relative bandwidth is 19.44%.The results show that this filter can reduce loss effectively,and its size is reduced about 40% compared with the traditional filter.It makes miniaturization easy.The bandwidth is also greatly increased.The proposed filters are simulated by Ansoft Ensemble 8.0 software.