Miniaturized CORPS-BFN to feed OLAF SAR Instrument

Abstract

A miniaturization of a CORPS-BFN (Coherently Radiating Periodic Structures - Beam Forming Network) to properly feed OLAF (OverLapped subArray Fed) antenna for SAR Instrument at L-Band is presented. The original beam-forming network was based on 4-ports Gysel power combiner/divider implemented in a suspended stripline technology, and in this work a strong miniaturization technique has been applied to fit it in the desired lattice of 230 mm, which is slightly less than a wavelength of the higher frequency of the system (1.215-1.3 GHz). The minimized version still provides low insertion and return losses, high isolation between input/output ports and the required overlapping between the different equivalent beams.