Multiband hybrid MIMO DRA for Sub‐6  GHz 5G and WiFi ‐6 applications

Abstract

This paper inspects a parasitic element-based inverted meandered U-shaped printed line fed hybrid MIMO DRA. The feed of a single element of the 2-elements hybrid MIMO DRA consists of a meandered shaped line coupled to the inverted L-shaped parasitic element printed on the top side of FR-4 substrate with a partial ground on the back. The rectangular-shaped alumina dielectric is placed over the feed to form the single element hybrid DRA. The individual element resonating at 3.40-4.32 GHz (23.83%) and 4.96-5.05 GHz (1.80%) achieves the dual-band characteristics by exciting multiple modes within the rectangular dielectric resonator. The low-profile Multiple Input-Multiple Output (MIMO) antenna configuration having an overall size of 0.57 λ Â 0.23 λ Â 0.14 λ mm 3 consists of two orthogonally placed hybrid rectangular DRAs. The inter-element isolation for a connected ground MIMO structure is better than 22 dB in the desired bands of operation without using any isolation improvement techniques. The MIMO diversity parameters are simulated and measured to validate the MIMO performance. The diversity metrics envelope correlation coefficient is below .175, and .15, the mean effective gain ratio is 0 dB, the total active reflection coefficient values are below 15 dB, and channel capacity loss values are below 0.5 bits/sec/Hz in the lower, and upper bands of operation which are within the recommended practical limits. The presented MIMO design achieved the peak gain of 12.87dBi, and minimum radiation efficiency of 83%, with stable radiation characteristics that make the antenna suitable for Sub-6 GHz 5G and WiFi-6 applications.

MIMO Dielectric Resonator Antennas for 5G Applications: A Review

“…However, the design has the drawback of limited impedance bandwidth. A hybrid MIMO DRA with multiband characteristics was introduced in [13]. It used two rectangular DRAs on a substrate with a partial ground plane.…”

Enhancing gain and isolation of a quad-element MIMO antenna array design for 5G sub-6 GHz applications assisted with characteristic mode analysis

“…Despite its high gain, it has quite low bandwidth with large size. In 18 , 2-element MIMO Dielectric Resonator Antenna (DRA) with an inverted meandering U-shaped line engraved on it, is examined with measurements of 50 × 25 × 1.6 mm 3 . Due to its dual band design, it resonates at 3.7 GHz and 5 GHz with – 35 dB and – 21 dB, impedance bandwidth of 0.92 GHz (3.40–4.32) GHz and 0.09 GHz (4.96–5.05) GHz and gain is 12.87 dBi.…”

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

“…Out of these, operating frequency plays a vital role in the MIMO antenna design. The selection of operating frequency depends on the application targeted for the proposed system, and major applications of these antennas are in cellular communication [13], baseband communication and Wi-Fi or Bluetooth services [14,15]. The operating frequency also depends on the size and shape of the antenna elements designed for specific applications.…”