GOALI: SUPER-HIGH Q TE01 MODE DR FILTERS FOR WIRELESS PERSONAL COMMUNICATION SERVICES (PCS)

这个多所大学、跨学科的产学研合作（GOALI）提案代表了一个明确的、连贯的研究计划，以解决当前快速增长和竞争激烈的个人通信系统（PCS）行业面临的一些最重要的科学和技术挑战。我们提出了一种双管齐下的方法，包括实验和建模研究的结合，以解决美国个人电脑行业面临的这些关键挑战。该GOALI计划的第一个目标是进行系统的实验调查，以解开DR材料加工问题。我们将阐明钽酸钡镁（BMT）的加工-微波性质的关系，这是一种典型的DR材料。谐振腔材料的加工对dr的质量（用微波Q Tf， K来定义）有着深远的影响。目前，用于PCS基站滤波器的BMT材料加工难度大，成本高。这些材料的处理还不是很清楚，并采用了一种反复试验的方法。实现超高Q DR的处理路线需要在氧气环境中进行数天的处理，并且通常会导致微波特性的不可预测和巨大变化，特别是Q因素。我们将仔细研究与BMT材料加工相关的基本问题，并确定创新路线，这将导致具有可控和更可预测的微波介电特性的高性能DR。第二个目标是开发实用的、现实的计算机设计工具，用于pc设备的虚拟原型，如滤波器、多路复用器和功率分配器。目前，尽管pc的设备结构正变得越来越复杂，但设计这些设备的工具在其能力方面仍然相当有限。因此，我们将开发复杂的、精确的、高效的数值技术来模拟复杂的导向和谐振电磁结构。将开发和使用模式匹配技术，以确定不能用单一坐标系描述的结构的广义散射矩阵（例如，矩形围场中的圆柱形障碍物）。可以实现显著的成本节约，并且可以使用我们计划创建的虚拟原型工具来消除涉及构建实际原型的多次迭代的试错方法。具有丰富经验和互补性研究的PI正在联合起来进行拟议的跨学科研究。积极的工业合作（Trans-Tech, Inc.和condutus Inc.）将构成这一目标计划的一个重要方面。除了交流信息和材料外，学生和教师对行业的频繁访问（以及反向访问）也将对该计划产生积极影响。特别关注研究生、本科生和高中生的培训，特别是那些来自弱势群体的学生，并利用每一个可能的机会将我们的研究融入适当的学术课程，这将是这个项目的其他一些重要方面。在无线技术领域，来自国外的竞争非常激烈。在这方面，我们的建议是及时的，最终将有助于进一步提高美国在无线通信设备领域的竞争力。我们的计划解决了pc基站滤波器行业的一些最迫切的需求。该项目将促进DR材料和基于DR的器件的新型和改进的加工路线的发展。我们期望产生的新知识将作为未来商业开发改进和创新的基于DR的pc设备的工具。除了PCS之外，我们的想法/发现还可以输出到其他领域，如超导材料和磁性材料中使用平面结构的可调谐滤波器。因此，从长远来看，我们的计划将对无线通信领域和下一代科学家和工程师的教育培训产生更广泛的影响

9906242PhuleThis multi-university, cross-disciplinary industry-university collaborative (GOALI) proposal represents a well defined, coherent research plan to address some of the most significant scientific and technological challenges currently faced by the rapidly growing and highly competitive personal communication systems (PCS) industry. We propose a two-prong approach that involves a combination of experimental and modeling researches to address these key challenges facing the US PCS industry. The first objective of this GOALI program to undertake systematic experimental investigations to unravel the DR materials processing issues. We will elucidate the processing-microwave property relationships for barium magnesium tantalate (BMT), an archetypal DR material. The processing of resonator materials has a profound influence on the quality (as defined by the microwave Q Tf , K) of the DR. At the present time, the BMT materials used for PCS base station filters are quite difficult and expensive to process. The processing of these materials is not well understood and utilizes a trial-and-error approach. Processing routes for achieving super-high Q DR require several days of processing in oxygen ambient and often result in unpredictable and large variations in the microwave properties, especially the Q factors. We will carefully investigate the fundamental-issues related to the processing of BMT materials and identify innovative routes that will result in high performance DR with controlled and more predictable microwave dielectric properties. The second objective is to develop practical, realistic computer design tools for virtual prototyping for PCS devices such as filters, multiplexes, and power dividers. At the present time, although the device structures for PCS are witnessing increasing levels of complexity, the tools for designing these devices remain quite modest in terms of their capability. Therefore, we will develop sophisticated, precise, and efficient numerical techniques for modeling complex guiding and resonant electromagnetic structures. Mode matching techniques for the determination of generalized scattering matrices of structures, that cannot be described by a single coordinate system (e.g., cylindrical obstacles in rectangular enclosures), will be developed and used. Significant cost savings can be realized and a trial-and-error approach, that involves several iterations of building an actual prototype, can be eliminated using the virtual prototyping tools we plan to create.PI's with considerable experience and complementary research are joining forces to conduct the proposed cross-disciplinary research. An active industrial collaboration (Trans-Tech, Inc. and Conductus Inc.) will constitute an important facet of this GOALI program. In addition to exchange of information and materials, frequent visits of students and faculty to industry (as well as reverse visits) will also positively impact this program. Special attention to the training of graduate, undergraduate, and high-school students, especially those from underrepresented minorities and tapping every conceivable opportunity to integrate our research into the appropriate academic courses will be some of the other important dimensions of this program.In the area of wireless technology the competition from foreign countries is intense. In this regard, our proposal is timely and will ultimately help further enhance the competitiveness of the United States in the area of devices for wireless communications. Our program addresses some of the most compelling needs of the PCS base station filter industry. This program will catalyze the development of novel and improved processing routes for DR materials and DR based devices. The new knowledge we expect to generate will serve as a tool for future commercial development of improved and innovative DR based devices for PCS. In addition to PCS, our ideas/findings would be exportable to such other areas as tunable filters using planar structures in superconducting materials and magnetic materials. Therefore, in the long run our program will have a broader impact on the area of wireless communications and the educational training of the next generation of scientists and engineers.***