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A switchable wideband reflective metamaterial polarisation rotator based on plasmon resonances has been presented. The proposed design comprises of periodically arranged split rings on which PIN diodes are mounted to demonstrate switching operation. By controlling the bias voltage of the PIN diodes, the polarisation of the reflected wave can be controlled over a broad frequency range. The simulated result shows that over 90% cross‐polarised reflection is observed in 2.42–3.52 GHz under OFF state, whereas co‐polarised reflection is exhibited under ON state. Polarisation rotation has also been explained using two plasmon resonances in terms of electromagnetic responses. Finally the structure has been fabricated, whose measured results agree well with simulated responses, thus validating the concept behind switchable polarisation rotator. [ABSTRACT FROM AUTHOR]