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This work addresses the integration of reflectarray antennas (RA) on thinfilm Solar Cell (SC) panels, as a mean to save real estate, weight, or cost inplatforms such as satellites or transportable autonomous antenna systems. Ourgoal is to design a good RA unit cell in terms of phase response and bandwidth,while simultaneously achieving high optical transparency and low microwaveloss, to preserve good SC and RA energy efficiencies, respectively. Since thereis a trade-off between the optical transparency and microwave surfaceconductivity of a conductor, here both standard copper and transparentconductors are considered. The results obtained at the unit cell leveldemonstrates the feasibility of integrating RA on a thin-film SC, preservingfor the first time good performance in terms of both SC and RA efficiency. Forinstance, measurement at X-band demonstrate families of cells providing a phaserange larger than 270{\deg} with average microwave loss of -2.45dB (resp.-0.25dB) and average optical transparency in the visible spectrum of 90% (resp.85%) using transparent conductive multilayer (resp. a copper layer).

Copper and Transparent-Conductor Reflectarray Elements on Thin-Film Solar Cell Panels