Dual-band compact MIMO antenna for 3G, Wi-MAX and WLAN applications

This paper presents a compact MIMO antenna with dual band operation. S
¹¹
<; -9.5 dB is achieved over lower band of 2.576-3.728 GHz and upper band of 5.14-5.88 GHz which covers 2.572-2.62 GHz (3GPP), 2.6-2.69 and 3.3-3.7 GHz (4G Wi-Max) and 5.15-5.35, 5.725-5.875 GHz (WLAN) applications. Isolation techniques like ground slots and ground extension are used to achieve a S
₁₂
<; -20 dB in both the operating bands. The measured results of fabricated antenna structure match with the simulation results. MIMO performance parameter ECC in the lower band is <; 0.02 and in higher band is <; 0.04 with stable radiation pattern. The proposed antenna has dimension of 28×35×28×1.6 mm
³
which makes it feasible to be used within portable devices.