A Review on Different Techniques of Mutual Coupling Reduction Between Elements of Any MIMO Antenna. Part 2: Metamaterials and Many More

Abstract

The demand for high-data rate wireless transmission in compact handheld devices like smartphones has revolutionized the importance of compact multiple-input-multiple-output (MIMO) antenna design, which can fulfill the increasing demand without sacrificing the additional bandwidth or increased transmit power (A.

A Modified SWB Hexagonal Fractal Spatial Diversity Antenna With High Isolation Using Meander Line Approach

“…In this section, the various diversity performance parameters (for example ECC and DG) were analyzed to avail the advantages of the proposed MIMO/diversity antenna. The measurement of mutual coupling and correlation between the adjacent antennas can be evaluated by using the ECC based on the far-field radiation pattern [20], [21], [24]. It represents how isolated or correlated the communication channels of the MIMO antenna are.…”

“…Thus to achieve the benefits like high data rate transmission, improved channel capacity, larger bandwidth, reduced fading effect, and improved energy efficiency the MIMO technology is amalgamated with SWB antenna. Recently several wideband MIMO/diversity antennas have been VOLUME 4, 2016 investigated by contributors from academia and industry [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

“…The antenna with these drawbacks may not be suitable for future IoT communication devices. Other popular techniques to diminish the mutual coupling between closely stationed anten-nas employ metamaterial electromagnetic bandgap (MTM-EMBG) decoupling structure [23][24], fractal MTM-EMBG [25], metasurface [26], defected ground structure (DGS) [27][28], and meta-surface wall [29]. These antennas show reasonably high isolation but have narrow bandwidth, resulting in limited data transmission rate.…”

Quad‐band circularly polarized super‐wideband MIMO antenna for wireless applications

“…Better spatial diversity in the MIMO system will ensure a low correlation among antenna elements and will ensure less signal dropout in a multipath and fading environment. Several MIMO antennas have been designed in the literature to improve their characteristics in terms of impedance bandwidth, miniaturization, & isolation improvement 1,2 …”

“…Keeping the aim of compactness in mind several MIMO antennas have been demonstrated with high isolation among antenna elements in the existing literature till now 1,2 . A compact planar multi‐band antenna has been designed based on a Right Hand/Left‐Hand transmission line for mobile applications 3 .…”