Design of microstrip patch reflectarray antenna at W-band

Printed Reflectarrays have a wide range of advantages of Reflector antennas and Phased array antennas. In this paper, the phase compensation techniques for Microstrip Reflectarray antennas have been investigated for W-Band frequency and reviews of various techniques for phase compensation, like variable sizes of the patch, adding stubs of variable lengths which form the essential part in the design of a Reflectarray antenna. A waveguide simulator concept is implemented in the characterization of reflected phase. An array of 9×9 patch elements with and without patch compensation is designed at 94GHz with a waveguide feed using ANSYS HFSS. A good agreement of antenna performance has been observed in terms of SLL and HPBW.