Folded Reflectarray Antennas for Shaped Beam Applications

Folded reflectarrays in general consist of a feed, a reflectarray, and a second substrate with printed structures in front of feed and reflectarray, acting as polarizing filter. In this way, compact and possibly lowcost antennas can be designed. This contributions demonstrates the possibilities of this approach for shaped beam antennas using a phase-only design approach and extending the polarizer with additional phase-adjusting elements to allow all types of dual reflector approaches. As examples, two sector antennas, a multibeam antenna, and a multibeam antenna with sector-shaped lobes are presented.