Equilateral triangular dielectric resonator based co‐radiator MIMO antennas with dual‐polarisation

Abstract

In this study, two types of dielectric resonator antennas (DRAs) with dual‐polarisation are proposed and investigated for multiple‐input multiple‐output (MIMO) applications. The first design is a dual‐slant polarised DRA and exhibits the measured impedance bandwidth of 8.2% (5.27–5.72 GHz) and 11.2% (5.05–5.65 GHz) for Port1 and Port2, respectively. Across the operating frequency band, the isolation between the input ports is better than 22 dB and the measured gain of the antenna varies in the range of 5.99–6.38 dBi. The second design developed here is a dual‐linearly polarised DRA which is able to provide horizontal and vertical polarisations and is realised by integrating a two‐stage rat‐race coupler with the DRA for excitation purpose. In this case, the measured impedance bandwidths are 11.81% (5.18–5.83 GHz) and 15.18% (4.93–5.74 GHz) for Port1 and Port2, respectively, and the inter‐port isolation is better than 20 dB throughout the operating frequency band. The antenna exhibits the measured gain variation of 5.94–6.48 dBi for Port1 and 5.54–5.86 dBi for Port2. Furthermore, for both the antennas, the envelope correlation coefficient is below 0.0004 throughout the bandwidth and the total active reflection coefficient is better than −10 dB, confirming the good diversity and radiation performance.

Investigation on dual‐band equilateral triangular shaped dielectric resonator antennas for WLAN applications

“…Some relevant works are also available in Refs. 11‐17. Recently, the Q ‐factor and bandwidth performance of the dominant mode excited inside an ETDRA are reported by the authors of this article in Refs.…”

“…The triangular shaped dielectric resonator antennas (DRAs) of various forms are reported in the literature, 1‐19 among which, the equilateral triangular dielectric resonator antennas (ETDRAs) are quite popular.…”

MIMO Dielectric Resonator Antennas for 5G Applications: A Review

“…A 2 × 2 MIMO planar DRA array prototype is simulated, processed, and tested to confirm its viability. Figure 15 shows the design of the DRA structure In [70], isolation between the ports of a single-element triangular MIMO DRA was improved by removing a semi-cylindrical portion of the DRA between the ports. A simulated two-port MIMO dielectric resonator antenna for 5G mm-wave applications presented in [71] consisted of two p-shaped dielectric resonators that were excited by a microstrip line through a slot, improving isolation and offering a compact size.…”

Mutual Coupling Reduction in Closely Spaced MIMO Dielectric Resonator Antenna in H-Plane Using Closed Metallic Loop

“…Although MIMO antennas provide high data rates and speed over multipath channels, high coupling between radiating elements can affect a MIMO antenna diversity. Therefore, high isolation among radiating elements is required to realize the MIMO diversity system [1,2]. A lot of research has been done on MIMO antennas, that use a patch as a radiating element due to the ease of manufacturing.…”