基于超材料结构的小型化可调滤波器

A Compact Tunable Filter Based on Metamaterial Structure

为了提高频谱资源的利用率,解决传统滤波器组体积大的问题,利用开口环结构的超材料具有高集成度的特性,设计了一款整体尺寸仅为15mm×20mm的滤波器.基于时域有限积分法分析了开口环结构滤波器的反射系数曲线与电磁参数之间的响应特性,通过在开口环缝隙处加载可调谐的二极管器件,实现了超材料滤波器在X波段(10.9~12GHz)的连续可调,扩展了滤波器的工作频带.该可调谐超材料滤波器的工作带宽达11.0%,通带内回波损耗最小值为32dB,插入损耗最大值为0.38dB,具有高集成度、宽频带、通带内选频特性良好的特点.

To improve the utilization of spectrum resources and solve the problem of targe volume of traditional filter, a metamaterial filter with a compact size of 15 min× 20 mm was designed by using the high integration split-ring resonators. Based on time domain finite integral method, the response between the reflection coefficient curve of the split-ring structure filter and the electromagnetic parameters was analyzed. By loading tunable diode into the gap of split-ring, the filter was continuously tunable at X-ray band （from 10.9 GHz to 12 GHz）, extending the operating frequency band of the filter. The bandwidth of the designed filter is about 11.0% ,return loss minimum is 32 dB and insertion loss maximum is 0.38 dB. The results illustrate that the split-ring metamaterial filter shows the characteristics of compact size, wide bandwidth and good band pass.