Polarization-Agile, Multiple-Resonant Smart Antenna Elements

9900280 Gearheart本研究计画的目的是发展一种新的极化捷变线天线单元。提出了一种新的四端线天线的几何结构，沿着提出了调谐天线的谐振频率、阻抗和辐射方向图的新方法。四端天线可以在两种模式中的一种下辐射：偶极模式或缝隙模式。理想情况下，这两种模式的辐射模式和谐振频率是相同的，并且它们的偏振在每个方向上都是正交的。此外，每个端子都应该看到与同轴馈电相匹配的阻抗，以减少系统反射。两种模式的叠加将允许任何线性、圆形或椭圆偏振的合成，并且相同的模式辐射图案和正交模式偏振将允许任何方向上的任何偏振的合成。新颖的集成调谐短截线将允许极化捷变线天线在多个指定频率有效地辐射每个模式。遗传算法优化技术将被用于极化捷变多谐振线天线的开发中。所提出的极化捷变线天线单元将允许通过包含优化的极化信息来显著改进智能天线系统。这表示相对于使用两个垂直天线并且使用来自一个天线或另一个天线的最强信号的传统极化分集系统的显著改进。这种天线不是正交极化的所有角度的到来和单一使用的一个天线或其他不允许合成的圆形或椭圆形极化。一个国家资源的教育高中和本科生的天线和微波电路的设计和测量提出。一个致力于高中和大学生教育的互联网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，向高中生和大学生介绍天线和微波电路领域。为全国高年级本科课程中使用的本科生微波和天线教科书提供补充。（例如少数民族）高中学生在密尔沃基通过提供无线数据和语音网络服务。此外，为来自少数民族代表性不足的大学的本科生研究人员开设的暑期研究项目将有助于增加这样的学生人数，成功完成电气工程学位，并鼓励这些学生考虑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.