W-band microstrip reflectarray with single-layer

This paper describes a W-band microstrip reflectarray antenna with a single-layer substrate. The reflector element is a double resonant ring-round mixed structure, in which the circle radius and ring inner radius are changed. The combination of the two types elements can achieve a full 360° range of phase shifts. Using this technique, a 50 by 50 W-band reflectarray antenna has been designed. The feasibility of this design is verified with simulated and measured results.