Frequency and Bandwidth Tunable mm-Wave Hairpin Bandpass Filters Using Microfluidic Reconfiguration With Integrated Actuation
Frequency and Bandwidth Tunable mm-Wave Hairpin Bandpass Filters Using Microfluidic Reconfiguration With Integrated Actuation
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DOI：
10.1109/tmtt.2020.3006869
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发表时间：
2020-07
影响因子：
4.3
通讯作者：
Enrique González-Carvajal;G. Mumcu
中科院分区：
文献类型：
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作者：
Enrique González-Carvajal;G. Mumcu
微流体可重构射频（RF）器件通常被发现具有低损耗、宽频率可调谐性和高功率处理能力。最近，集成驱动的微流体可重构器件已经提出了紧凑的毫米波器件的应用。本文首次介绍了微流体可重构频率和/或带宽可调带通滤波器（BPF）在毫米波段与集成驱动操作。BPF由耦合发夹谐振器组成。频率调谐是通过电容加载谐振器。带宽调谐是通过在谐振器之间产生变化的电容负载来控制谐振器间的耦合来实现的。电容加载机制是使用选择性金属化板（SMP），可以重新定位在微流体通道内实现的。微流体通道直接位于过滤器的固定金属化层上方。压电弯曲致动器放置在过滤器的接地平面提供SMP运动能力。BPF在最坏情况下的插入损耗为3.1 dB。具有频率调谐能力的滤波器在28-38 GHz频带内工作。分数带宽可调谐性变化从7.8%到16.7%，在38 GHz和7.6%到12.5%，在28 GHz的滤波器，是能够两种调谐机制。滤波器的特点是处理5 W的连续RF功率，而不需要厚的接地层或散热器。此外，频率调谐速度被表征为285 MHz/ms。
Microfluidically reconfigurable radio-frequency (RF) devices in general have been found attractive for low-loss, wide-frequency tunability and high-power-handling capabilities. Recently, integrated actuation of the microfluidically reconfigurable devices has been proposed for compact mm-wave device applications. This article for the first time introduces microfluidically reconfigurable frequency- and/or bandwidth-tunable bandpass filters (BPFs) operated at the mm-wave band with integrated actuation. The BPFs consist of coupled hairpin resonators. Frequency tuning is achieved by capacitively loading the resonators. Bandwidth tuning is achieved by creating varying capacitive loading among the resonators to control the interresonator couplings. The capacitive loading mechanisms are realized using the selectively metallized plates (SMPs) that can be repositioned within the microfluidic channels. The microfluidic channels are located directly above the stationary metallizations of the filter. Piezoelectric bending actuators placed under the filter’s ground plane provide the SMP motion capability. The BPFs perform with the worst-case insertion loss of 3.1 dB. Frequency-tuning capable filters operate within 28–38-GHz band. Fractional bandwidth tunability varies from 7.8% to 16.7% at 38 GHz and 7.6% to 12.5% at 28 GHz for the filter that is capable of both tuning mechanisms. The filters are characterized to handle 5 W of the continuous RF power without needing thick ground planes or heat sinks. In addition, the frequency-tuning speed is characterized to be 285 MHz/ms.