左手材料微波带通滤波器的滤波特性分析

Filter Characteristic Analysis of Materials Microwave Band-Pass Filter by Left-Handed

研究了多层复合左右手传输线结构微波滤波器的滤波特性.用有限时域差分法对结构滤波特性进行了数值模拟和优化,结果表明结构的几何参数得到优化匹配时,在带内衰减-10 dB处左手通带带宽0.46 GHz,插入损耗-0.38 dB,带内没有波纹等滤波特性.表明结构的几何参数得到优化匹配时,可得到通带带宽更宽,插入损耗降低,带内平坦度提高的滤波特性.

To study the filter characteristic of the microwave band-pass filter by multilayered （ML） composite- right/left - handed （CRLH） transmission line （TL） structure, the structural filter characteristic was optimized ,and numerical simulations were made by the finite-difference time-domain （FDTD）method. The results showed that ：When the structural design parameter were well matched, as in-bandpass loss was -10 dB, passband width became 0. 46 GHz, if insertloss is -0. 38 dB, wave filter characteristics were not showed inside band width. This means that the better design parameters were set the better filter characteristics such as broader pass band , lower insert loss , better flatterness could gee.