High frequency techniques at UHF and above

“超高频及以上高频技术”泛指可用射线从数学上描述超高频电磁波的技术。拟议的研究将开发可应用于下文所述实际问题的数学模型。 航空业感兴趣的是符合飞机曲面外表面的低调“共形天线”。我们最近对“漏波”的研究使我们了解到，如果平面结构变得弯曲，漏波天线可能会发生什么。我们将探索设计弯曲漏波天线的可能性。 当射线穿过复杂的建筑材料(如钢筋混凝土)时，很难预测其强度。我们正在开发一种针对这种情况的模型。研究结果对室内无线网络的规划有一定的参考价值。 在渥太华国防部的支持下，我们开发了一种计算机代码，它使用高频技术来预测海军舰艇、飞机和其他感兴趣目标的雷达特征。在这项工作中，我们确定了一些需要解决的理论限制。特别是， 目标上的锐角和边缘的影响很难建模，这将需要进一步的基础研究。

"High Frequency Techniques at UHF and Above" broadly refers to techniques that can be used to mathematically describe electromagnetic waves at ultra-high frequencies in terms of rays. The proposed research will develop mathematical models that can be applied to practical problems described below. The aircraft industry is interested in low-profile "conformal antennas" that conform to the curved outer surface of the aircraft. Our recent research on "leaky waves" has led us to an understanding of what might happen to a leaky-wave antenna if the flat structure gets curved. We will explore the possibilities of designing curved leaky wave antennas. As a ray passes through a complicated bulding material such as reinforced concrete, it is difficult to predict its strength. We are developing a model for this situation. The results will be useful for the planning of indoor wireless networks. With support from the Department of National Defence, Ottawa we developed a computer code that uses high frequency techniques to predict the radar signature of naval vessels, aircraft, and other targets of interest. In the course of that work we have identified some theoretical limitations that need to be addressed. In particular, the effects of sharp corners and edges on a target are difficult to model, and this will require further basic research.