AbstractThis article presents a cascaded arrangement comprising a double‐layer frequency selective surface circularly polarizing (CPFSS) and a second screen that can be switched between artificial magnetic conductor (AMC), or perfect electric conducting, (PEC), states.The CPFSS consists of two stacked aluminum sheets patterned with periodic split ring structures. While the AMC is a PCB sheet patterned with metallic squares interconnected by links. By either open or short circuiting these links it is shown that the cascade of screens can be made to twist, or not to twist, an incident 45° linearly polarized signal through 90° upon reflection from the assembly. The system was designed and optimized using CST software and predictions were validated experimentally at X‐band. The results obtained show good agreement between experimental and measured monostatic reflection loss results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 577–580, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24979