A high efficiency offset-fed X/Ka-dual-band reflectarray using thin membranes

Modern space-borne applications require large-aperture antennas having capabilities of low mass and high packaging efficiency to overcome the launch vehicle size and weight restrictions. This paper presents a dual-band reflectarray antenna developed for future space inflatable structures with thin membranes. To offset the effects of the thin-membrane substrates required in the inflatable structure, foam layers are inserted below the X and Ka band membranes, allowing broadband CP performance at both bands. More than 50% efficiencies are achieved at both frequency bands, showing potential for even larger high-gain inflatable antennas for future space applications.