Abstract
A multi-input multi-output (MIMO) antenna for wireless local area network (WLAN) applications operating in 2.4 GHz and 5.8 GHz frequency bands is proposed in this paper. The proposed dual-band MIMO antenna is composed of two symmetrical radiation elements, and the isolation performance is improved by adopting parasitic elements and a defective ground plane. The measured reflection coefficients are less than −10 dB in the bandwidth range of 2.12–2.8 GHz and 4.95–6.65 GHz, respectively. The measurements show excellent isolation of −21 dB and −15 dB in both desired frequency bands, respectively. The total peak gain is greater than 4.8 dBi. The calculated envelope correlation coefficients (ECC), based on the measured S-parameters, are smaller than 0.01 and 0.024 in the lower and higher frequency bands, respectively. The dimension of the presented antenna occupies 50 × 40 × 1.59 mm3. It is suitable for IEEE 802.11 a/b/g/n (2.4–2.4835 GHz, 5.15–5.35 GHz and 5.725–5.85 GHz) WLAN applications.
Highlights
In recent years, the available wireless communication spectrum has faced a high degree of traffic limitation due to rapid growth in the number of subscribers, and the need for a higher data transmission rate, better reliability and spectrum allocation efficiency has stimulated considerable research on multiple-input multiple-output technology [1,2,3]
It is challenging work to improve the isolation of a multi-input multi-output (MIMO) antenna, and so various methods have been proposed [1,2,3,4,5,6,7,8,9,10,11]
Metamaterials [12] have been applied to various mobile terminals, such as artificial magnetic conductor (AMC) [13], called meta-surface or reactive impedance surface (RIS) [14]
Summary
The available wireless communication spectrum has faced a high degree of traffic limitation due to rapid growth in the number of subscribers, and the need for a higher data transmission rate, better reliability and spectrum allocation efficiency has stimulated considerable research on multiple-input multiple-output technology [1,2,3]. It is challenging work to improve the isolation of a MIMO antenna, and so various methods have been proposed [1,2,3,4,5,6,7,8,9,10,11]. Several decoupling technologies, such as a neutralization line (NL) [2,3], parasitic elements [4,5] and a defected ground structure (DGS) [6,7,8], have been presented. TThhee aaccttuuaall ppiiccttuurree ooff tthhee aanntteennnnaa.. ((aa)) TToopp vviieeww;; ((bb)) bboottttoomm vviieeww
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