Description
The main objective of this activity has been to develop critical Circular Polarization (CP) surfaces that will simplify the accommodation of multibeam antennas. A range of new CP surface designs including; a) a novel Circular Polarization Selective Surface (CPSS) geometry based on coupled split ring resonators; b) broadband linear to circular polarisation converters; c) dual-band dual-polarisation LP to CP converters; d) frequency selective CP absorbers with a reflection band; have been developed and validated by means of breadboards. Such designs can be exploited in e.g. a) the equivalent of dual gridded reflector antennas in CP; b) antenna architectures with multiport LP feeds; c) antennas capable to serve the down- and up-links from a single reflector and with a single feed per beam; d) reflectors with congruent beams for the up and down link frequencies. A baseline and a backup antenna architecture among those has been designed in more detail. The baseline solution was manufactured and tested, demonstrating very good agreement with theoretical predictions and thereby validating the benefits of the developed concept.
