Since its discovery ferroelectricity has been an intriguing phenomenon in material science and is usually observed in a single ferroelectric material. Here, it is shown that ferroelectriciy can also occur...

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Shipborne antenna is the important part in the communication system of modern ships. However, the coupling between shipborne antennas greatly influences their communication performance so an effective decoupling method is needed to address the coupling problem and guarantee communication quality. In this paper, a metamaterial screen consisting of complementary split ring resonators (CSRRs) which are arranged periodically on the both sides of a substrate, is placed between two cone shipborne antennas to reduce their mutual coupling. The decrease of coupling is verified by a fabricated prototype. The measure results show considerable decoupling effect that the isolation at 0.1 GHz and 0.22 GHz can be increased by 24dB and the average of isolation in 0.1-0.25 GHz band with the strongest coupling is increased by 44%. Meanwhile the isolation in the whole operation band of the cone shipborne antenna, i.e. 0.1-0.5 GHz, is better than 20dB. Moreover, the envelope correlation coefficient (ECC) in 0.1-0.25 GHz band, which is the band with the strongest coupling, is below 0.15. The simulated and measured results indicate that this metamaterial screen can be applied to enhance the isolation between two shipborne antennas.INDEX TERMS complementary split ring resonator (CSRR), decoupling, metamaterial, shipborne antenna

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