Improved Isolation Metamaterial Inspired Mm-Wave Mimo Dielectric Resonator Antenna for 5g Application

Abstract

A rectangular Dielectric Resonator Antenna (DRA) four element Multiple in Multiple Out (MIMO) is proposed for 5G application, and each element is supplied with slot-coupled microstrip feed. The entire construction has a dimension of 20 mm × 40 mm. Four Dielectric Resonators are mounted exactly above the slot. In order to improve the isolation, metamaterial is printed on top of the dielectric resonators, which move away the solidest coupling fields. As the metamaterial structure interacts with electromagnetic fields, field distributions are disturbed which results in reduction of coupled fields. Since the metamaterials are printed on top of the dielectric resonator, the proposed antenna structure has the simplest and compact design. The proposed structure is operating with an impedance bandwidth of 2.23 GHz with operating range from 26.71 GHz to 28.91 GHz, which covers the 28 GHz (27.5 GHz-28.35 GHz) band allotted by Federal Communications Commission (FCC) for 5G application. With all four-port excitation, the proposed structure shows a broadside radiation pattern with gain above 7 dBi in the entire operating bands. The Envelope Correlation Coefficient (ECC) for operating bands is within the target value. They are designed and fabricated to validate the proposed antenna. The simulated and measured values are nearly equal, which means that the proposed MIMO DRA is the right choice for mm-Wave 5G implementation.

A Metasurface-Based MIMO Antenna for 5G Millimeter-Wave Applications

“…It is observed that the the proposed MIMO antenna with metasurface array outperforms the other reported works in terms of isolation. Moreover, the antenna gain exhibited by proposed MIMO antenna is significantly higher than the works [32,34,36,38,39,40]. Although the works presented in [35,37] achieved higher gain as compared to the proposed antenna, however, these MIMO structures have only two elements, and also MIMO performance analysis is not provided.…”

“…In recent years, metamaterials have been investigated extensively owing to their various electromagnetic characteristics not commonly present in natural materials [33]. Several works reported mm-wave MIMO antennas with metamaterial structures to enhance the antenna performance, particularly reduction in mutual coupling or antenna gain improvement [34][35][36][37][38][39][40]. The work in [34] proposed a 2×2 mm-wave MIMO antenna with bi-layered Frequency Selective Surface (FSS) superstrate for addressing the mutual coupling effects.…”

“…The introduction of EBG enhances gain by 1.9 dBi with a peak gain of 6 dBi. In [40], a DRA with four element MIMO configuration is proposed for mm-Wave applications. A metamaterial structure is printed on the top side of the DRA to enhance isolation.…”

Metasurface-Based Wideband MIMO Antenna for 5G Millimeter-Wave Systems

“…Recently, lot of research has been done on metamaterials due to their electromagnetic properties do not present in the natural materials [33]. Few mm-wave antennas utilizing a metamaterials concept, specifically focusing on gain improvement have been reported in [34][35][36][37][38]. In [34], a bowtie shaped antenna for the mm-wave band holding a MIMO configuration is presented.…”

“…The proposed antenna yields a maximum bandwidth of 1 GHz while the size of the antenna after employing EBG surface becomes 27.5x27.5 mm 2 . Likewise, in [36], a DRA with four port MIMO antenna is proposed for the mm-wave band. For the gain enhancement purpose, a metamaterial surface is used on the top of DRA surface which gives a maximum gain of 7 dB for the desired operating band .…”