铁电薄膜可调带通滤波器

低温物理学报 , 2008, 30(2): 150-153. doi: 10.3969/j.issn.1000-3258.2008.02.013

铁电薄膜可调带通滤波器

张晓玲 ^1, , 孟庆端 ^2, , 普杰信 ^3, , 张雪强 ^4, , 何豫生 ^5,

1.河南科技大学电子信息工程学院,洛阳,471003

2.河南科技大学电子信息工程学院,洛阳,471003

3.河南科技大学电子信息工程学院,洛阳,471003

4.超导国家重点实验室中国科学院物理研究所北京凝聚态物理国家实验室,北京,100080

5.超导国家重点实验室中国科学院物理研究所北京凝聚态物理国家实验室,北京,100080

关键词：铁电薄膜 , 介电常数 , 滤波器 , 可调带通滤波器

A CPW TUNABLE BANDPASS FILTER USING FERROELECTRIC THIN FILM

铁电薄膜的介电常数随外加电场强度的增加而减小.依据铁电薄膜的这一特性,提出了一种新颖的基于共面传输线结构的铁电薄膜可调带通滤波器.为了减小传输损耗,滤波器的导体部分由超导薄膜构成.滤波器的输入输出采用抽头线的方式分别与谐振器相接,外加电压通过输入输出端口直接施加到共面谐振器缝隙处的铁电薄膜上,用以改变铁电薄膜的介电常数,从而改变谐振器的谐振频率,实现带通滤波器通带频率的移动.这种新型可调带通滤波器具有结构紧凑、尺寸小及施加外加偏压容易等优点.仿真结果表明:铁电薄膜的介电常数在外加偏压下从250减小到150时,带通滤波器的传输特性曲线的形状基本保持不变,通带的中心频率从10.283GHz增加到10.518GHz,其3dB带宽保持在0.150GHz左右,反射损耗始终小于-17dB.

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