| Summary: | Although many different kinds of polarisers have been extensively studied in the last 20 years, most previous designs were passive and single-functional designs. In this study, a kind of a new active polarisation converter is designed. The active polarisation converter is comprised of periodically arranged circular ring embedded with PIN diodes. Four different results of polarisation transformation and reflection can be presented by controlling the bias voltage of the PIN diodes. The full-wave simulation results show that the proposed metasurface can rigorously satisfy the asymmetric transmission and can achieve cross-polarisation conversion with high efficiencies for linearly polarised waves. In addition, there is another particularly obvious advantage of the proposed structure is its broad operation bandwidth in microwave band, the bandwidth of the polariser reaches 70%, more than 90% cross-polarisation conversion efficiency is observed from 6.5 to 13.5 GHz.
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