Conversion from LP to CP by a tunable FSS with Embedded Microstrip Lines as Feeding Network

The design of a tunable Frequency Selective Surface (FSS) structure by means of PIN diodes is presented in this paper. Some significant FSS-related applications such as polarization control, polarization filtering, and spatial filtering are represented in the frequency band from 2 to 14 GHz. Using of a control network (CN) as a new configuration for biasing the active elements to compensate the symmetry breaking is also suggested.