Polarization-Agile, Multiple-Resonant Smart Antenna Elements

本研究项目的目标是开发一种新型的极化捷变线天线元件。提出了一种新的四端线天线几何结构，并提出了调整天线谐振频率、阻抗和辐射方向图的新方法。四端天线可以以两种模式之一辐射：偶极模式或槽模式。理想情况下，两种模式的辐射模式和谐振频率是相同的，它们的偏振在每个方向上都是正交的。此外，每个终端都应该看到同轴馈电的匹配阻抗，以减少系统反射。两种模式的叠加将允许合成任何线性、圆形或椭圆偏振，而相同的模式辐射模式和正交模式偏振将允许合成任何方向的任何偏振。新颖的集成调谐存根将允许极化敏捷线天线在多个指定频率下有效地辐射每种模式。遗传算法优化技术将应用于极化捷变多谐振线天线的研制。所提出的极化敏捷线天线元件将通过包含优化的极化信息来显著改进智能天线系统。这代表了传统极化分集系统的重大改进，传统极化分集系统使用两个垂直的天线，并使用来自其中一个天线或另一个天线的最强信号。这样的天线在到达的所有角度上都不是正交极化的，而且单一地使用一根或另一根天线不允许合成圆形或椭圆极化。提出了一项面向中学生和大学生的天线和微波电路设计与测量教育的全国性资源。一个致力于高中生和大学生教育的网站是该提案的关键组成部分。该网站的目标如下：通过设计实例、测量演示和实时天线辐射方向图测量，向高中和本科生介绍天线和微波电路领域。为全国本科高级课程使用的本科微波与天线教材提供补充。通过提供无线数据和语音网络服务，瞄准密尔沃基市中心（如少数族裔）的高中学生。此外，针对来自少数族裔占很大比例的机构的本科生研究人员的夏季研究项目将有助于增加成功完成电气工程学位的学生人数，并鼓励这些学生考虑攻读电气工程研究生学位。

9900280GearheartThe goal of this research project is to develop a new polarization-agile wire antenna element. A new four-terminal wire antenna geometry is proposed along with novel methods of tuning the resonant frequency, impedance, and radiation pattern of the antenna. The four terminal antenna can radiate in one of two modes: dipole mode or slot mode. Ideally, the radiation patterns and resonant frequencies of the two modes are identical and their polarizations are orthogonal in every direction. Furthermore, each terminal should see a matched impedance to the coaxial feed to reduce system reflections. Superposition of the two modes will allow for the synthesis of any linear, circular, or elliptical polarization, and identical mode radiation patterns and orthogonal mode polarizations will allow for synthesis of any polarization in any direction. The novel integrated tuning stubs will allow the polarization-agile wire antenna to radiate each mode effectively at multiple specified frequencies. Genetic algorithm optimization techniques will be used in the development of the polarization-agile multiple-resonant wire antenna.The proposed polarization-agile wire antenna element will allow for significant improvement in smart antenna systems through inclusion of optimized polarization information. This represents a significant improvement over traditional polarization diversity systems that use two perpendicular antennas and use the strongest signal from one antenna or the other. Such antennas are not orthogonally polarized for all angles of arrival and the singular use of one antenna or the other does not allow for the synthesis of circular or elliptical polarization.A national resource for the education of high school and undergraduate students on the design and measurement of antennas and microwave circuits is proposed. An internet site devoted the education of high school and undergraduate students is the key component of the proposal. The goals of the internet site are as follows:Introduce high school and undergraduate students to the fields of antennas andmicrowave circuits through design examples, measurement demonstrations, and real-time antenna radiation pattern measurements.Provide a supplement for undergraduate microwave and antenna textbooks used in senior-level undergraduate courses nationwide.Target inner city (e.g. minority) high school students in Milwaukee through theoffering of wireless data and voice network services.In addition, a summer research program for undergraduate student researchers from institutions with large percentages of underrepresented minority groups will help increase the number of such students that successfully complete a degree in Electrical Engineering and encourage those students to consider graduate degrees in Electrical Engineering.