Design & analysis of a dual-band MIMO antenna to reduce the mutual coupling

Abstract

A compact dual wide-band multiple-input-multiple-output (MIMO) radiator is presented in this article. The MIMO radiator is developed on a 1.5 mm thick FR-4 substrate. The proposed structure is composed of U-shaped patches which are connected with small rectangular slit loaded circular rings and partial ground plane with chamfer edges. This arrangement is placed symmetrically at a far distance of 2.5 mm to achieve dual-operating bands with a high amount of isolation, radiation efficiencies and group delay between two radiators. The proposed compact dual-band radiator is resonating at 2.5/6.4 GHz frequencies and it provides isolation greater than 20 dB over the operating bands. The proposed design has a size of 0.45λ 0 × 0.291λ 0 × 0.03λ 0 mm and |S 11 | of about 41.25 dB and 14.58 dB. This design has a wide impedance matching in the range of frequencies from 2.38 GHz to 3.17 GHz & 5.14 GHz to 7.39 GHz with |S 21 | < 15 dB. The performance of diversity is calculated through diversity gain (DG) higher than 9.99, and Envelope Correlation Coefficient (ECC) which is less than 0.04 over the operating bands.

Six-element MIMO antenna structure with squared ring structure with multiband and high gain characteristics for C/X/Ku/K band applications

“…Secondly, for a system with highly efficient antennas (>90%), the ECC can be calculated in terms of S-parameters, as expressed in equation (2). The S-parameters technique, shown in equation (2) [37], demonstrates a different technique for calculating ECC.…”

A Numerical Investigation of Graphene-Based Hilbert-Shaped Multi-Band MIMO Antenna for the Terahertz Spectrum Applications

“…Evaluating ECC using far-field radiation parameters takes a long time and much effort. Another method described in [ 29 ] for finding ECC using the S-parameters approach is shown in Equation (2). …”

Multiple-input multiple-output antenna for dual-band applications with a novel radiating patch and enhanced feeding network

“…A comparison between the introduced MIMO antenna characteristics and the references (Rezvani and Zehforoosh, 2018; Babu et al, 2019) is listed in Figure 14. It is observed that the proposed antenna has the highest frequency band coverage compared to other designs despite the low complexity of the structure.…”

“…Multi-input multi-output (MIMO) antennas are a good solution for the mentioned issues. Also, there are lots of designs introduced in the recent years, such as Rezvani and Zehforoosh (2018), Aw et al (2019), Babu et al (2019). MIMO antennas were designed for the most of the wireless technology systems including Bluetooth and WLAN.…”