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A MIMO structure consisting of two extremely compact planar inverted-F antennas (PIFAs) (λ/60×λ/20×λ/60) is proposed for GSM 900 MHz and 2.4 GHz wireless local area network applications. The miniaturisation of each antenna is achieved through a spiral-shaped PIFA and a capacitive load, forming a LC resonator. Both antennas have a good impedance bandwidth of 0.88–0.945 and 2.39–2.48 GHz for 0.9 and 2.4 GHz band, respectively. The two PIFA antennas are polarised orthogonally to each other, and isolation better than −28 dB is achieved in both bands without any structure etched on the ground. The predicted results are compared with the measured data and good agreement is found.
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Li et al. (2009) studied this question.
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