4-Port MIMO Antenna Using Common Radiator on a Flexible Substrate for Sub-1GHz, Sub-6GHz 5G NR, and Wi-Fi 6 Applications

Abstract

In this paper, an angular symmetric, common radiator coplanar waveguide (CPW) fed four-port multiple-inputmultiple-output (MIMO) antenna is designed on a 0.129λ L 2 RT Duroid (ε r =3.0, tanδ=0.001) substrate where λ L is the free space wavelength at the lowest operating frequency (f L ) of 0.6 GHz. The antenna has a -6 dB impedance bandwidth from 0.6-1.09 GHz, 2.6-3.4 GHz and 4.2-7.0 GHz to cover the emerging wireless communication bands. At the same time, it also has a -10 dB impedance bandwidth extending from 0.7-1.01 GHz, 2.6-3.18 GHz, 5.3-6.06 GHz, and 6.7-6.94 GHz. Design steps to enhance the operating bandwidth and the isolation in the sub-1GHz bands are presented. The antenna has a reasonable realized gain at the simulated and measured frequencies. It exhibits the pattern diversity which is useful for the MIMO implementation. The envelope correlation coefficient (ECC), Mean effective gain (MEG), and the channel capacity of the antenna have been computed from the measured results. In spite of the small circuit size at f L , the ECC 0.50 over the entire band is observed. In addition to the existing communication applications, this antenna can find newer applications in the emerging 0.6-1.09 GHz band, sub-6GHz 5G near radio (NR), and Wi-Fi 6 communications.

Mutual Coupling Reduction through Defected Ground Structure in Circularly Polarized, Dielectric Resonator-Based MIMO Antennas for Sub-6 GHz 5G Applications

“…Because of the absence of side waves, as well as elevated radiation effectiveness, extreme gain, adjustable structure, and exciting mechanisms, dielectric resonators have become a viable alternative for MIMO antennas in recent years [ 1 ]. Only a limited investigation articles on MIMO DRA are available in the open literature [ 2 , 3 , 4 , 5 , 6 ]. A rectangular MIMO DRA for 4G applications has been proposed in ref.…”

“…A rectangular MIMO DRA for 4G applications has been proposed in ref. [ 2 ]. However, using a short brooch and a cupper feed complicates the construction.…”

Investigation of a Miniaturized Four-Element Antenna Integrated with Dipole Elements and Meta-Couplers for 5G Applications

“…With 5G networks [ 9 , 10 , 11 ] and adoption of the derivatives such as 5G chipsets, the Internet-of-Things (IoTs), Machine-2-Machine (M2M) connectivity, multi-element antennas are integrated to optimize the performance with high bandwidth and low latency. The optimal feature is to synchronize the signal transmission process between Tx and Rx [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. This type of transmission process depends on antenna metrics, such as antenna sizes, bandwidth, isolations, and envelope correlation coefficients (ECC).…”

Circularly Polarized Printed MIMO Antenna for 5G Applications

“…The bandwidth of the antenna was 400 MHz when measured at 10 dB. Used an annular slot [7] as a cavity decreases port isolation by 20 dB at 28 GHz. Both ports reported 6.9 dBi, the 28 GHz maximum gain per element.…”