| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a multi-reflector antenna feeding part that suppresses a side lobe as a side lobe level rises under influence of an unnecessary diffracted wave due to a spillover at a sub-reflector edge. <P>SOLUTION: A loss material 7 is crimped on a sub-reflector 4, and a metal cover 8 is further fitted over the loss material 7. The size and inclination of the metal cover 8 are adjusted so as to guide an unnecessary diffracted wave generated at a sub-reflector edge 6 to the loss material 7. Further, the thickness and inclination of the loss material 7 are adjusted to absorb the whole of a guided electromagnetic wave. Consequently, a rise in the side lobe level due to a spillover at the sub-reflector edge 6 can be greatly reduced. The multi-reflector antenna feeding part having the sub-reflector which is partially conic and has its top directed to a feeding waveguide is characterized in that the loss material in a truncated-cone shape is crimped on the sub-reflector and the metal cover is fitted over the loss material. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
