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

Ahmed

2022

Sci Rep

Self Cite

A flexible quad-port MIMO antenna with good isolation features with both flat and bending configurations is presented and investigated in this work. The single unit of the MIMO is composed of a crescent-shaped monopole antenna connected with a curved coplanar waveguide (CPW) fed to enhance the operating bandwidth. A thin and flexible Roger 3003 material with thickness = 0.13 mm, εr = 3, and tan δ = 0.001 is used. To improve the isolation between ports which in turn improves the performance of the MIMO system, the single unit antenna is repeated four times and placed orthogonal to each other. A 54 mm × 54 mm × 0.13 mm (0.63λo × 0.63λo × 0.0015λo @ 3.5 GHz) is the total size of the quad ports MIMO antenna. The flexible MIMO antennas in both flat and bending layouts are simulated, tested and the outcomes achieved S11 < − 10 dB from 3.5 GHz up to 11 GHz with mutual coupling ≤ − 17 dB between ports. The radiation patterns of the MIMO antenna are tested with 5 dB peak gain and with semi-omnidirectional and bidirectional patterns in both two planes. The Diversity Gain (DG) values ≥ 9.9 dB through the designed working band, Envelop Correlation Coefficient (ECC) lower than 0.03 from 3.5 GHz to 4 GHz and lower than 0.01 from 4 to 11 GHz, and Channel Capacity Loss (CCL) value ≤ 0.5 bit/s/Hz over the worked band are calculated and extracted in flat and bending configurations and achieved suitable values which support the suggested antenna in the UWB flexible networks.

Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Ahmed

2022

Sci Rep

Self Cite

“…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].…”

mentioning

confidence: 99%

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

Sree

2022

Wireless Netw

Self Cite

In this paper, a miniaturized size UWB 4-element MIMO antenna with a band rejection feature is introduced. The four elements have a rectangular radiator with curved edges and a partial ground plane with an etched slot to enlarge the bandwidth of the suggested structure to operate from 3 up to 12 GHz with S11 ≤ − 10 dB. The high isolation between elements was achieved by forming the antennas orthogonally without adding decoupling elements to simplify the design. The suggested design has a size of 47 × 47 mm2 placed on low price FR4 substrate. A simple slot is etched into the radiator to achieve the desired band rejection. The simulated and tested outcomes achieved operated band extended from 3 up to 12 GHz with band rejection feature within 3.3 GHz up to 4.3 GHz to eliminate interference with WIMAX applications and high isolation of more than 22 dB between ports. Also, the antenna fulfills peak gain of 3.5 dBi, envelope correlation coefficient(ECC) < 0.005, diversity gain (DG) 9.98 dB and channel capacity loss (CCL) < 0.4 bit/s/Hz within the operating bands. The outcomes have good consistency which made the suggested antenna to be used in UWB MIMO systems.

Four‐radiator ultra‐wideband multiple‐input multiple‐output antenna with high performance and dual‐band rejection features for high‐speed communications

Aboelleil

Khalaf

2022

Int J Communication

Self Cite

We are discussing a compact, four elements with high-performance ultrawideband (UWB) multiple-input multiple-output (MIMO) antenna with dual band-notched traits. The antenna has a partial ground plane and the radiator has truncation to enhance the matching through the frequency range 2.5-12 GHz. The coupling between ports was reduced by assorting the elements of the antenna in an orthogonal manner and applying four stubs between them.The proposed antenna achieves two band-notched characteristics by introducing a T-shaped strip etched in the radiating elements and adding an open-loop resonator near the feeding line. The results, which were simulated and measured, indicate that the proposed design achieved a wideband from 2.5 to 12 GHz with two band-notched characteristics within 3.3-3.6 GHz (WiMAX implementations) and within 5.2-5.8 GHz (Wireless Local Area Network [WLAN] applications). As well as, the proposed antenna has high isolation >20 dB and a low-envelope correlation coefficient <0.005 through the band except for the band notches. These outcomes demonstrate the adequacy of the proposed UWB MIMO antenna for UWB MIMO applications.band notch, high isolation, MIMO antenna, UWB antenna | INTRODUCTIONUltra-wideband (UWB) technology plays an essential role in modern wireless communication systems and is attractive following the Federal Communications Commission (FCC) approval on frequency bands with no license. 1 UWB systems have many benefits, for example, low price, increasing the data rate, high security, and low power. The antenna is the main element in the UWB system; so many efforts are made to design the optimal UWB antenna. 2,3 But UWB technology faces a multipath problem. Therefore, the multiple-input multiple-output (MIMO) antenna is used as a solution.MIMO technology is used for increasing system capacity without increasing power and quality. [4][5][6][7] There are challenges in designing the MIMO antenna. The main challenges in the design are how to design the MIMO antenna with a compact size, low correlation, an increased number of elements in the antenna to improve the link data rate, and high isolation to be used in portable devices. To increase the isolation in the system, there should be a distance between the antenna elements, and this increases the antenna size; there are various techniques used for improving the system's isolation.