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Fig 1.

Geometry of different single-element CP antennas.

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Fig 1 Expand

Table 1.

Optimized dimensions of different single-element CP antennas (unit: mm).

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Table 1 Expand

Fig 2.

Simulated performance of different single-element CP antennas.

(a) Reflection coefficient (|S11|) and (b) Axial-ratio (AR).

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Fig 2 Expand

Fig 3.

Configurations of different two-element antennas.

(a) Ant-4 and (b) Ant-5.

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Fig 3 Expand

Fig 4.

Simulated performance of (a) Ant-4 and (b) Ant-5.

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Fig 4 Expand

Fig 5.

Simulated (a) S-parameter and (b) AR of the reference antenna and Ant-5.

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Fig 5 Expand

Fig 6.

Simulated surface current distribution at 5.5 GHz with Port-1 excitation.

(a) Ant-5 and (b) reference antenna.

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Fig 6 Expand

Fig 7.

Simulated |S11| results of Ant-5 with different lengths of (a) ls and (b) lf.

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Fig 7 Expand

Fig 8.

Simulated AR results of Ant-5 with different values of W0.

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Fig 8 Expand

Fig 9.

Simulated transmission coefficients of Ant-5 with different numbers of unit cells.

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Fig 9 Expand

Fig 10.

Simulated current distributions at 5.5 GHz for Ant-5 with different types of MS.

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Fig 10 Expand

Fig 11.

Photographs of the fabricated MS-based MIMO CP antenna.

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Fig 11 Expand

Fig 12.

Simulated and measured S-parameters, axial ratio, and gain of the proposed antenna.

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Fig 12 Expand

Fig 13.

Simulated and measured radiation patterns of the proposed antenna at 5.2 GHz.

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Fig 13 Expand

Fig 14.

ECC and DG of the proposed antenna.

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Fig 14 Expand

Table 2.

Performance comparison among two-element CP antenna.

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Table 2 Expand