基于LTCC铁氧体集成的磁电双可调多功能微波滤波器研究

Tunable microwave device is wildly used in high-tech fields like mobile communication, radar and electric warfare system. This project is focused on the next generation magnetoelectric dual tunable microwave filter. Firstly, considering the collision between the need of high performance and integration in multi-frequency communicating system, and the large size ，difficult integration and single performance of current magnetoelectric dual tunable device, the magnetoelectric dual tunable substrate integrated waveguide resonator based on partially magnetized ferrite LTCC and RF MEMS switch, and its electromagnetic characteristics are mainly studied. And secondly, to solve the contradiction between the complexities of the magnetoelectric dual tunable filters in structure and the theory deficiency in tunable filters, this project presents a coupling matrix model of the magnetoelectric dual tunable filters, tuning theories in a wide range of frequency, and studies the methods of extracting and designing parameters accurately. Finally, in order to solve the conflicts between the demands of frequency agility in multi-band wireless communication system and the insufficient fully adjustable modes in the present tunable filters, the methods of designing multi-layer, multi-cavity, fully tunable magnetoelectric dual tunable substrate integrated waveguide filters are researched and designed in this program. In a word, this paper aims at forming a kind of fresh method of the magnetoelectric dual tunable filters design, designing microwave filters which have the merits of integration, miniaturization, high quality and multi-function tuning, improving the range of tunable or controllable frequency greatly, causing the revolutionary change of reconfigurable technology.

可调微波器件在移动通信、雷达、电子战系统等高技术领域有着广泛的应用空间，本项目拟着重研究下一代磁电双可调微波滤波器。针对多频通信系统的高性能、集成化需求与当前磁电双可调器件尺寸较大、难以集成、性能单一的矛盾，着重研究基于部分磁化LTCC铁氧体与RF MEMS开关集成的磁电双可调小型化基片集成波导谐振腔，分析其电磁特性；针对磁电双可调滤波器结构的复杂性与可调滤波器综合理论研究欠缺的矛盾，着重研究磁电双可调微波滤波器的耦合矩阵模型和宽范围调谐理论，分析其参数提取技术及精确设计的方法；针对多频通信系统的多性能捷变需求与当前可调滤波器“全可调”模式不足的矛盾，着重研究多层、多腔、多性能组合的“全可调”磁电双可调基片集成波导滤波器的设计方法。旨在形成一种全新的磁电双可调滤波器的设计思路，获得集成化、小型化、高品质、多功能调谐的微波滤波器，大大提升滤波器可调和可控范围，推动可重构技术的革命性变化。

磁电双可调滤波器既具备传统磁可调滤波器高品质因数和大范围调节的优点，又具有电可调滤波器调谐快、高精确度、能耗小、体积小的特点，具有巨大的潜力。本项目着眼于实现集成化、小型化、高品质、多功能调谐的磁电双可调微波滤波器展开研究。.首先对基片集成波导（Substrate Integrated Waveguide,SIW）小型化技术中的折叠技术的理论进行研究和完善，设计了多款小型化折叠基片集成波导滤波器，随后对多种电调谐方式分析，利用多种模型和调节方法，设计了中心频率和带宽可调、中心频率和传输零点可调以及中心频率带宽和传输零点三种参数可调的“全可调”滤波器，弥补当前全可调滤波器存在的可调参数较少、调节范围窄、腔体模式单一、调节不稳定等不足。.之后，重点研究磁电双可调微波滤波器的电路网络模型，分析其参数提取技术及精确设计的方法，在此基础上，将PIN二极管和钇铁石榴石铁氧体(Yttrium Iron Garnet,YIG)嵌入式SIW相结合，设计了一款YIG嵌入式的SIW电磁二维可重构窄带滤波器和一款YIG嵌入式的SIW电磁二维可重构超宽带滤波器。两款滤波器通过磁可重构和电可重构相结合扩展了单一重构调谐的范围，相较于现有文献减小了插入损耗，降低了中心频率调谐的复杂程度，实现了一种方式调谐时不再需要另外一种方式辅助调谐。.最后，提出将YIG作为SIW的基底，设计了基于YIG基底的磁电双可调滤波器和基于YIG基底的SIW磁电全可调滤波器，该类型的滤波器具备YIG嵌入式SIW磁电双可调滤波器调谐范围宽和调谐方式简单的优点，同时又避免了铁氧体材料的复杂嵌入工艺。设计的全可调滤波器可实现频率和带宽两种参数的独立调谐，与现有文献比较，调谐方式更为简单，仅通过PIN二极管可以实现25种状态的调谐，包含5种中心频率和5种带宽；磁调谐的加入使得中心频率的调谐范围扩展了110%，进一步增加了滤波器调谐的灵活性。所有的工作推动了可重构滤波器的发展。