A dual‐band MIMO antenna decoupled by a meandering line resonator for WLAN applications

Abstract

In this article, a couple of dual‐band MIMO antenna operating in 2.4–2.48 GHz and 5.15‐5.825 GHz bands for WLAN applications is presented. The WLAN MIMO antenna system comprised double dual‐band monopole structures and a meandering line decoupling resonator connected to the ground. The two antenna elements have a distance of 15.3 mm which is about 1/8 wavelength at 2.4 GHz. The coupling between two ports at 2.4 GHz is decreased from −9 dB to −25 dB by involving the meandering‐line resonator. Since the return loss becomes worse after the meandering line resonator is involved for decoupling, the parasitic elements are used to improve the matching performance in the working frequency band. The simulation model is designed and manufactured. The measurement results show the antenna system is an eligible candidate in MIMO WLAN applications.

A Compact Multiband Mimo Antenna for Ieee 802.11 a/B/G/N Applications

“…However, compact size results in strong electromagnetic coupling and weak isolation between antenna elements. The isolation performance of MIMO antennas can be enhanced by loading SRRs [1,2], neutralizing line [3][4][5], Y-shape isolator element [6], a wide slot and a pair of narrow slots [7], meandering-line resonator [8], bent T-shaped resonator [9], and an elliptical slot and a rectangular parasitic strip [10]. There are also some novel structures such as reconfigurable MIMO antenna [11] and simple decoupling structure [12].…”

Dual‐element antenna with high isolation operating at the WLAN bands

“…The isolation between the two planar inverted‐F antennas (PIFAs) is increased higher than 20 dB by etching two slots on the ground plane . The meandering line resonator technique is proved to be effective in achieving good isolation. In Reference , a bent T‐shaped resonator embedded between two C‐shaped monopole antennas increases the isolation higher than 15 dB.…”

“…By using pattern and polarization diversity, the three‐element MIMO antenna achieves good isolation higher than 15 dB . As presented in these references, meandering line resonator and polarization diversity all need larger space. For the neutralization line, it may take a long time to find the favorable connection points, which are usually located at low‐impedance area.…”

Higher isolation dual‐frequency distinct coupled antennas based on integrated filtering structures

“…But the maximum coupling of the two antennas with 4.5 mm spacing with recommended decoupling network in the entire frequency bands exceeds −14 dB. There are also many studies on decoupling networks between the MIMO antennas . For example, a dual‐band lumped element decoupling network is used in to reduce coupling for two‐antenna system.…”

“…There are also many studies on decoupling networks between the MIMO antennas. [2][3][4][5][6] For example, a dualband lumped element decoupling network is used in 7 to reduce coupling for two-antenna system. In addition, the defect ground structure 8 and partially extended ground plane 9 between adjacent MIMO antennas also effectively reduce mutual coupling.…”