Abstract: A space-fed, flat, reflectarray antenna apparatus for providing a desired degree of phase shift to a received electromagnetic wave to form a narrow beamwidth signal. The reflectarray antenna, in one form, is provided as a dual reflection antenna having a polarization sensitive subreflector and a reflectarray element spaced apart from the subreflector. The reflectarray element includes a large plurality of independent patch antenna units which each form antenna cells. Each patch antenna unit includes a vertical polarization sensitive antenna, a horizontal polarization sensitive antenna and a microstrip transmission line conjoining the two antennas. The microstrip transmission line of each antenna unit has a predetermined length intended to provide a predetermined degree of phase shift.