Band-Reconfigurable Filter With Liquid Metal Actuation
Band-Reconfigurable Filter With Liquid Metal Actuation
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DOI：
10.1109/tmtt.2018.2823307
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发表时间：
2018-06-01
影响因子：
4.3
通讯作者：
Sigmarsson, Hjalti H.
中科院分区：
文献类型：
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作者：
McClung, Sarah N.;Saeedi, Shahrokh;Sigmarsson, Hjalti H.
一种基片集成波导带可重构滤波器，具有四种配置：1)双频段；2)低频段；3)高波段；4)无带，提出。选择液态金属是为了通过填充或清空某些通孔和通道来实现不同结构之间的切换。通过改变液态金属在滤波器中的位置，调整腔边界和传输线以获得所需的响应。为了验证这一概念，设计并制作了一个c波段的原型滤波器。液体金属驱动滤波器的频率响应（在所有的工作配置）与模拟和制造镀铜滤波器进行了比较。仿真结果与实测结果吻合较好。对于单频和双频滤波器配置，在中心频率为4.6 GHz和7 GHz时，插入损耗小于1.9 dB，回波损耗大于16 dB。对于无频带（或全停止）配置，在4至8 GHz之间的整个频带上的隔离优于36 dB。此外，为了量化使用液态金属的影响，比较了制备的液态金属驱动谐振器和镀铜谐振器的卸载质量因子。所提出的滤波器清楚地展示了在未来可重构射频硬件中使用液态金属驱动的潜力。
A substrate integrated waveguide band- reconfigurable filter with four configurations: 1) dual band; 2) low band; 3) high band; and 4) no-band, is presented. Liquid metal is chosen to enable switching between the different configurations by filling or emptying certain via holes and channels. By altering the liquid metal placement in the filter, cavity boundaries and transmission lines are adjusted to obtain the desired response. In order to demonstrate the concept, a prototype filter in C-band is designed and fabricated. The frequency responses of the liquid-metal-actuated filter (in all operating configurations) are compared with simulated and fabricated copper-plated filters. Good agreement is observed between the simulation results and the measurements. For the single-and dual-band filter configurations, insertion loss less than 1.9 dB and return loss greater than 16 dB are achieved at the center frequencies of 4.6 and 7 GHz. For the no-band (or all-stop) configuration, isolation is better than 36 dB over the entire band between 4 and 8 GHz. Additionally, to quantify the impact of using liquid metal, unloaded quality factors of a fabricated liquid-metal-actuated and copper-plated resonator are compared. The presented filter clearly demonstrates the potential of using liquid metal actuation in future reconfigurable RF hardware.