Large 2-D thinned array for the Microwave Imaging Radiometer with Synthetic Aperture (MIRAS)

The development and performance of the large two-dimensional thinned array antenna for the ESA Microwave Imaging Radiometer with Aperture Synthesis (MIRAS) is here presented. The radiating elements are distributed along three arms that form a Y-shape when deployed in space. Interferometry in two orthogonal linear polarisations is performed by coherent reception at element level in order to produce aperture synthesis, thus avoiding a larger antenna area. The overall instrument performance is enhanced by sequentially rotating or mirroring the radiating elements as in array design techniques. This work is being performed under a Demonstrator Pilot Project of the European Space Agency for the provision of one arm's segment and radiators.