Dielectric resonator‐based four‐element eight‐port MIMO antenna with multi‐directional pattern diversity

In this article, a three-port nonplanar multiple-input-multiple-output/diversity antenna with very high isolation between the radiating elements is presented. To realize diversity from the proposed three-dimensional (3-D) antenna configuration, three monopole radiating elements are arranged at an angle of 120 . The isolation between the radiators is enhanced by using a multilayered cylindrical decoupling structure and defected ground structure (DGS). The DGS reduces the coupling due to surface waves while the cylindrical decoupling structure reduces the coupling due to space waves. The proposed antenna offers consistent pervasive connectivity in the wireless communication environment due to its 3-D geometry with multiple radiating elements and good diversity performance. The prototype is fabricated and measured result shows that more than 42 dB isolation is obtained at the center frequency 1.45 GHz. An increment of 1.2 dBi in the antenna gain is also achieved by using DGS and decoupling structure arrangement. The proposed antenna can be easily placed inside the cylindrical housing or it can be integrated with the existing electronics chip, thus nullifying the requirement for dedicated location in the system. K E Y W O R D Scylindrical decoupling structure, DGS, isolation, MIMO, monopole, diversity

“…The total active reflection coefficient (TARC) is also an important parameter to define the diversity performance of multiport antenna system which can be calculated by:

TARC = \sqrt{\sum_{i = 1}^{N} {|b_{i}|}^{2}} / \sqrt{\sum_{i = 1}^{N} {|a_{i}|}^{2}}

{[b]}_{N \times 1} = {[S]}_{N \times N} {[a]}_{N \times 1}

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three‐dimensional cylindrical design multiple‐input‐multiple‐output/diversity antenna with high isolation for wireless communication applications

Mishra

Das

Pattnaik

et al. 2019

“…TARC is also an important parameter to define diversity performance of the multi‐port antenna system . The simulated and measured TARC curves of the proposed MIMO antenna are shown in Figure .…”

Section: Mimo Characteristicsmentioning

confidence: 99%

“…The modern communication systems desire high data rate and reliability with improved system capacity, which can be achieved by using a multi‐port antenna configuration. In a rich scattering environment, antenna diversity is an important technique, which mitigates the multipath fading problem . In recent years, multi‐port antenna systems have received remarkable attention as they utilize diversity techniques to improve quality, reliability, and signal reception of the wireless link.…”

Section: Introductionmentioning

confidence: 99%

Carbon fiber‐based deca‐port multiple‐input‐multiple‐output antenna with pattern diversity and high inter‐element isolation

Mishra

Das

Pattnaik

et al. 2020

In this article, a deca-port carbon fiber-based multiple-input-multiple-output (MIMO) antenna with pattern diversity is presented. The radiating elements of the proposed antenna consist of low cost, light weight, environmental friendly graphite material. The 10 radiating elements of the MIMO antenna are arranged in a group of two (termed as sub-MIMO structure), in a cubical manner to cover all the propagating directions. Furthermore, the two carbon fiber-based radiating elements of the sub-MIMO structure are placed in an orthogonal arrangement to generate different radiation patterns. The antenna exhibits high inter-element isolation and low envelope correlation coefficient due to orthogonal placement of the radiating elements. The antenna is fabricated and the measured results confirm that the proposed MIMO/diversity antenna may be useful for vehicle-to-network applications. The MIMO performance parameters such as diversity gain, total active reflection coefficient, mean effective gain, channel capacity loss are evaluated and found within suitable limits. The three-dimensional pattern diversity helps to communicate in all directions.

“…Metamaterial surface shields and frequency selective surface walls (FSSs) have been used to avoid parasitic waves between antenna elements. A two‐element, 4‐port, and 8‐port CDRA diversity/MIMO system with bidirectional pattern diversity is proposed by Das et al for WLAN applications.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐compact 4‐port DR antenna for multi‐input multi‐output standards

Belazzoug

Messaoudene

Aidel

et al. 2020

Here, an ultra‐compact Multi‐Input‐Multi‐Output (MIMO) antenna system is presented for Wireless Local Area Network (WLAN) applications. The proposed antenna compactness approach is based on using Cylindrical‐Dielectric‐Resonator‐Antenna (CDRA) symmetry with the help of image theory to achieve the best size reduction of the resonators and maintain the resonance frequency of the original CDRA. The electric/magnetic walls approach is utilized to miniaturize the size by exploring the symmetry and antisymmetry of the resonant mode. First, a CDRA for MIMO system is designed and tested in terms of return loss and radiation efficiency. Then, two configurations of MIMO‐Antennas (two and four ports) are examined by using the same substrate size. The 2‐port‐MIMO antenna is built from two half‐CDRs (HCDRs) facing each other. Similarly, four‐quarter‐CDRs (QCDRs) are created to form a 4‐port MIMO antenna system. As a result, a 75% size reduction is achieved (size of 30 × 30 × 7.62 mm3). The measured impedance bandwidth for the 4‐port MIMO antenna is 5.4% (5.4‐5.7 GHz), with more than 15 dB isolation levels. Proper levels of Envelope Correlation Coefficients (ECCs) are also achieved (1 × 10−2‐4 × 10−2), with a channel capacity loss (CCL) of 0.04 bits/S/Hz. The proposed MIMO antennas are suitable for compact wireless communication systems.