Microwave Guidance Technology and Its Applications
FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT-PATTERSON AFB OH
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This article provides the basic features of millimeter wave guidance technology as well as the primary millimeter wave guidance systems and their characteristics. It also analyzes current levels of technology inside and outside China and discusses future prospects of millimeter wave technology and its applications. Millimeter waves revere to the frequency spectrum of operational wave lengths from one to ten millimeters. This corresponds to operational frequencies between 300 GHz and 30 GHz. The position on the electromagnetic frequency spectrum of millimeter waves is between microwave and infrared waves. This determines that millimeter waves have both microwave and optical characteristics. Millimeter waves are weakened by the atmosphere to a much greater extent than are microwaves. There are marked changes in the amount of loss as the frequencies are changed. In general, the higher the frequency the greater the attenuation. However, due to absorption effect of vapors and oxygen, peaks appear at certain frequencies, resulting in especially great attenuation rises around 35 GHz, 94GHz, 140GHz and 220 GHz. Another way of putting this is that the areas where there is slight attenuation are called transmission windows.
- Radiofrequency Wave Propagation