A compact multiple-input multiple-output antenna with high isolation for wireless applications

A systematic investigation of four ports MIMO antenna depending on flexible material for UWB networks

“… The antenna operates in a good way under the bending conditions in the term of S-parameters ECC, DG, and CCL which confirms the stability of the suggested antenna under bending conditions. A flexible MIMO antenna in comparison with other flexible and rigid designs to confirm the performance of the suggested MIMO antenna shows that the suggested antenna has a miniaturized size with a thin substrate than the flexible and rigid substrates in 13 – 23 with a suitable level of isolation, gain, and ECC values that support it in the UWB flexible networks applications. …”

“…A flexible MIMO antenna in comparison with other flexible and rigid designs to confirm the performance of the suggested MIMO antenna shows that the suggested antenna has a miniaturized size with a thin substrate than the flexible and rigid substrates in 13 – 23 with a suitable level of isolation, gain, and ECC values that support it in the UWB flexible networks applications.…”

“…However, adding an antenna with a small distance increase the mutual coupling between elements and decrease the isolation between ports. as well, the efficiency of the individual antenna can be affected 12 which leads to the use of decoupling structures to reduce the mutual coupling which in turn increases the complexity of the design 10 , 13 . Both 2-port and 4-port with rigid and flexible substrates and with suitable isolation can be utilized in the MIMO systems 13 – 23 .…”

“…In 13 , 4 ports monopole antennas with four stubs between elements placed on a rigid FR-4 substrate operating from 3.2 to 12 GHz and producing isolation and peak gain higher than 17 dB and 4 dBi. A four ports MIMO antenna printed on a rigid FR-4 substrate with adding the elements orthogonally to each other is designed to operate from 3.03 to 10.74 GHz and achieve isolation higher than 20 dB and a peak gain of 5 dBi is investigated in 14 .…”

UWB MIMO antenna with 4-element, compact size, high isolation and single band rejection for high-speed wireless networks

“…Researchers developed several attempts to enhance the isolation of the UWB MIMO antenna. Some of them used decoupling structures such as stubs [8][9][10] and the others arranged the antenna elements in an orthogonal layout [11][12][13][14][15].…”