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A very compact dual-band two-element multiple-input-multiple-output antenna for wireless local area network applications is presented in this letter. The antenna occupies an overall area of 24 × 25 mm 2 . A microstrip-line-fed antenna with two quarter-wavelength slots of different lengths, which radiate at 2.5 and 5.6 GHz, is used as an antenna element. The proposed antenna uses a simple decoupling network, based on a wide slot and a pair of narrow slots, to achieve good isolation (better than 20 dB) between the ports. Moreover, the envelope correlation coefficient of the proposed antenna is within the acceptable limit.
Nandi et al. (Sun,) studied this question.