Isolation enhancement in dual-band MIMO antenna by using metamaterial and slot structures for WLAN applications

Abstract

A dual-band MIMO antenna with enhanced isolation operating in 2.35-2.50 GHz and 5.13-5.88 GHz bands is investigated and presented. The proposed antenna system is deformed from two inverted-F antennas, and the distance between the antenna elements is only 0.104λ (λ- wavelength of 2.4 GHz). To enhance isolation and reduce mutual coupling, the metamaterial and slot structures are efficiently and innovatively designed on the ground plane for two bands. Both decoupling methods effectively improve the antenna isolation, with metamaterials acting on the lower band and slots acting on the higher band. The mutual coupling at 2.4 GHz and 5.5 GHz is reduced by 15.24 dB and 8.19 dB, respectively. Then, the optimized MIMO antenna can cover both 2.4 GHz and 5 GHz WLAN bands, and has the advantages of wideband, compact size, good radiation, enhanced isolation, and low ECC. The measured results agree with the simulated results, which shows that the proposed MIMO antenna system has potential application value in WLAN system.

Reduction of mutual coupling in a microstrip array antenna with circular polarization in the C-frequency band using a combination of DGS and EBG methods

“…There are different types of antennas (spiral wire, reflective horn, phased array, microstrip, etc). MIMO (multi-input, multi-output) is a wave propagation technology (antenna) for wireless telecommunication systems, and it has found a special place in wireless telecommunications due to the significant increase in data throughput and telecommunication link range, without the need for additional bandwidth or additional transmission power [1][2][3][4]. If the antennas are placed next to each other in an array [5] (both in receiver and transmitter modes), an undesired coupling occurs between the two antenna radiators elements, due to the reciprocal coupling of electric fields [6] which is induced from the first radiating element to the second radiating element and causes current to flow on the second radiating element, which is called the undesired electromagnetic coupling effect of the reciprocating coupling [7].…”

Design and analysis of metasurface-based CPW-Fed UWB MIMO antenna for wireless communication systems

“…The decoupling network was reported in [16,17]. In addition, several studies on metasurfaces have been reported in [18][19][20]. The content of these researches can only improve the coupling of single frequency point or narrow band, which can not provide good universality for the design of broadband MIMO antenna.…”