Reconfigurable Antennas and FSS with Magnetically-Tunable Multiferroic Components
Reconfigurable Antennas and FSS with Magnetically-Tunable Multiferroic Components
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DOI：
10.1109/ectc51906.2022.00027
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
Pawan Gaire;J. Volakis;S. Bhardwaj;Veeru Jaiswal;M. Pulugurtha
中科院分区：
文献类型：
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作者：
Pawan Gaire;J. Volakis;S. Bhardwaj;Veeru Jaiswal;M. Pulugurtha
薄膜铁电材料的介电性能通常随电场的变化而变化。然而，射频介质的厚膜调谐需要更高的电压来产生足够的电场。此外，可调性总是与质量因子(Q)的损失相关联。我们提出利用磁场来调整载流线圈在铁电-铁磁多铁质异质结构下的介电常数。这将使我们能够实现可重构的射频结构，如用于智能屏蔽应用和可调谐天线的频率选择表面。首先，我们通过使用基于多物理场的铁电-铁磁异质结构层压板数值模拟来证明这种系统的可行性。合成了一种具有代表性的多铁性全陶瓷堆，并对其进行了表征，结果表明该堆具有大于2倍变化的应变敏感介电常数，该介电常数可以通过磁场偏置进行磁调谐而有效地产生。
Dielectric properties of thin-film ferroelectric materials are commonly tuned with electric field. However, thick-film tuning of RF dielectrics requires higher voltage to induce adequate electric field. Furthermore, tunability is always associated with a loss in Quality Factor (Q). We propose the use of magnetic fields to tune permittivity of RF dielectrics with current-carrying coils integrated under the ferroelectric-ferromagnetic multiferroic heterostructures. This will allow us to realize reconfigurable RF structures such as frequency-selective surfaces for smart shielding applications and tunable antennas. First, we demonstrate the feasibility of such systems by using multiphysics-based numerical modeling of ferroelectric-ferromagnetic heterostructures laminates. A representative multiferroic all-ceramic stack is synthesized and characterized to show strain-sensitive permittivity with more than 2× variation, which can be effectively created through magnetic field bias for magnetic tuning.