ECCM AUXILIARY ANTENNA SYSTEM FOR A MULTIBEAM SAR ARRAY
A SAR (Synthetic Aperture Radar) antenna typically consists of a large planar array to obtain a directive pattern with low side lobe level. A multibeam SAR system requires a set of secondary beams, implementing some additional features. To protect the SAR operation from possible jammers ECCM (Electronic Counter-Countermeasure) capabilities can be implemented requiring an auxiliary beam which cover the portion of main pattern to be protected. A possible architecture of this secondary antenna system is here presented by using a set of radiating elements combined together to obtain the ECCM channel. To minimize the feeding network complexity and to maximize the system reliability, the ECCM antenna is a cluster of circular corrugated horns, eventually realized as a single-block unit.
synthetic aperture radar secondary antenna system multibeam antenna horn cluster electromagnetic compatibility techniques