G. Zhai, Z. N. Chen and X. Qing, "Enhanced Isolation of a Closely Spaced Four-Element MIMO Antenna System Using Metamaterial Mushroom," in IEEE Transactions on Antennas and Propagation, vol. 63, no. 8, pp. 3362-3370, Aug. 2015. doi: 10.1109/TAP.2015.2434403
Abstract:
A double-layer mushroom structure is proposed to enhance the interelement isolation of a four-element antenna system, wherein four closely positioned substrate-integrated cavity-backed slot (SICBS) antenna elements are configured for multiple-input multiple-output (MIMO) applications. A wall with a double-layer mushroom structure is positioned in between the four antenna elements. An antenna prototype with a ground plane size of 0.96 λo × 0.96 λo (λo is the free space-wavelength at 2.4 GHz) demonstrates an enhanced interelement isolation of 16 dB for parallel-directed antenna element pairs, while the isolation of the orthogonally directed antenna element pairs remains unchanged over the operating bandwidth (|S11|
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