高功率微波束的旋摆扫描方法

A method for high power microwave beam scan by spin and swing

用于高功率微波发射的偏置抛物面天线 ,使其反射面绕馈源轴旋转 ,反射面与馈源借助真空椭圆软波导进行摆动 ,从而实现面域扫描。给出这种天线的旋摆扫描关系式 ,对其扫描性能及其与结构和旋摆参数的关系进行分析 ,结合物理光学修正 。

For high power microwave application, the offset parabolic antennas have advantages of lower side lobes, lower standing wave ratio, high efficiency and avoiding breakdown comparing with the center feed parent. Without any rotary RF joint in the high power microwave transmit system, the scan can be achieved by spinning the reflector around the axe of the feed and swinging the reflector and feed around the focus in the ( x,z ) plane by using a vacuum flexible elliptical waveguide. By geometric approach, the scan functions are presented. The scan properties are characterized with the maximum elevation angle range at a definite distance. The renations between the scan characteristics and the antenna geometric and spin swing parameters are given for the antenna design. The spin swing single offset parabolic antenna has small transmission loss and simpler mechanical scan construction.