Performance analysis of edge-feed rectangular parallel plate slot-array antenna panel for compact space-borne x-band sar system

In this paper, we discuss the design scheme of a waveguide feeder for a wideband rectangular parallel plate slot-array antenna for a high resolution synthetic aperture radar sensor on-board a 100kg micro-satellite, scheduled to be launched in 2020. We analyze the performance of the edge-feed system with two waveguide feeders for each antenna panel. HFSS simulation results show that the edge-feed system reduces the undesired Poynting vector tilt in the parallel plate and achieves good antenna gain and efficiency with larger bandwidth, thereby giving it an edge over the conventional end-feed system However, the two-feeder antenna system increases the weight and active reflection and due to asymmetric design, phase opposition is difficult to achieve, thereby leading to structural complexity.