US-Sweden Cooperative Research: Ferroelectric Thin Films and Applications to Tunable Microwave Components

该奖项支持来自代顿大学的Guru Subrmanyam和学生与瑞典哥德堡查尔姆斯理工大学微电子系的Spartak Gevorgian的合作。此次合作将对铁电薄膜和可调谐微波元件的应用领域做出重大贡献。目标是开发可调谐电磁带隙结构（EBGs）和频率选择表面（FSS），开发重点是硅单片微波集成电路（MMIC）兼容的设计和工艺。钛酸锶和钛酸锶钡铁电薄膜在室温下具有低微波损耗和介电可调性。该研究还将专注于为电磁带隙结构和频率选择表面创建铁电可调谐平面二维人工晶格。通过铁电薄膜的介电可调性，可以通过调节阻带（带隙）和通带的中心频率来获得频率可调性。这个美国小组已经展示了一种可调的一维EBG，它提供了阻带频率可调性。目前的工作将把这一概念扩展到2D和潜在的3D EBGs，从而获得更好的抑制带和可调性。EBGs和FSS已被证明可以提高低天线的带宽并提高其增益。随着频率可调谐的可能性，微带贴片等低轮廓天线的性能将得到改善，可调谐FSS的空间滤波性能也将得到改善。Si MMIC兼容设计将使这些电路更容易集成到mic和MMIC中。与瑞典集团的合作。此外，来自代顿大学的研究生和本科生将积极参与拟议的研究，与查尔姆斯大学的博士后和研究生一起工作。

0405217SubramanyamThis award supports Guru Subrmanyam and students from University of Dayton in a collaboration with Spartak Gevorgian of the Department of Microelectronics at the Chalmers University of Technology in Gothenburg, Sweden. The collaboration will make significant contributions to the field of Ferroelectric thin-films and Applications in Tunable Microwave Components. The goal is to develop tunable Electromagnetic Bandgap structures (EBGs) and frequency selective surfaces (FSS) with development focused on Si monolithic microwave integrated circuits (MMIC) compatible designs and processes. Strontium titanate and barium strontium titanate ferroelectric thin-films with low microwave loss and dielectric tunability at room temperature will be used in this work. The research will also focus on creating ferroelectric tunable planar two-dimensional artificial lattices for electromagnetic bandgap structures as well as frequency selective surfaces. Through the dielectric tunability of the ferroelectric thin-films, one can obtain frequency tunability with the possibility of tuning the center frequencies of the stop- bands (bandgaps) and the pass-bands. The US group has already demonstrated a tunable one- dimensional EBG that offers stop-band frequency tunability. The current work will extend this concept to 2D and potentially 3D EBGs resulting in superior rejection bands and tunability. EBGs and FSS have proven to enhance the bandwidth of low antennas as well as improve their gain. With the possibility of frequency tunability, will come improved performance of low profile antennas such as microstrip patches, and improved spatial filtering properties of tunable FSS. Si MMIC compatible designs will allow easier integration of these circuits into MICs, and MMICs. The collaboration with the Swedish group. In addition, graduate and undergraduate students from the University of Dayton will be actively involved in the proposed research, working in conjunction with post- doctoral and graduate students from Chalmers University.