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A reconfigurable antenna is attractive for advanced wireless communication systems in the future. A novel polarisation switchable slot-ring array antenna as a kind of reconfigurable antenna is proposed. To realise the orthogonal polarisation switchable antenna, four switching diodes are mounted on a slot-ring antenna element. The both-sided MIC technology is effectively employed in forming this slot-ring array antenna. The Ansoft HFSS is used to simulate the antenna, and the characteristics of this functional antenna are discussed. The calculated results are compared with the measured ones, and these results agree well. Consequently, a readability of the polarisation switchable antenna is successfully verified.