Investigations on Stub-Based UWB-MIMO Antennas to Enhance Isolation Using Characteristic Mode Analysis

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The article proposes a broadband dual-port planar multiple-input-multiple-output (MIMO) antenna for the lower sub-6 GHz band (1.67 GHz to 3.15 GHz) applications. The simple structure of the MIMO antenna system consists of a semi-annular ring-shaped patch with a covering cap-like structure connected with two symmetrical L-shaped like structures. A partial ground with a rectangular mesh-like structure at the centre is designed and the same rectangular mesh has been added as the parasitic element with the driven patch to attain circular polarization and enhanced isolation. The miniaturized dimensions of the two-port MIMO antenna system are 0.28 λ0 × 0.54 λ0. The suggested two-port MIMO antenna offers a wider impedance bandwidth (IBW) of 61.41% around the versatile resonant frequency of 2.4 GHz. The proposed MIMO also depicts a minimum isolation of 26 dB with an edge-to-edge spacing of 0.19 λ0. An axial ratio bandwidth of 280 MHz is attained between 2.36 GHz and 2.64 GHz. The proposed antenna shows good IBW with excellent isolation, along with good radiation and MIMO diversity characteristics to operate at 2.4 GHz with circular polarization. The designed MIMO antenna can be utilized for IoT and modern mobile wireless applications as the broad bandwidth covers various IoT communication protocol frequencies such as 1.8 GHz (NB-IoT) and 2.4 GHz (Wireless LAN).

“…'Diversity gain' is yet another means of measuring the operation of MIMO antenna systems [22]. Figure 21(a) shows the software analyzed and measured values of ECC and DG.…”

Section: Diversity Gainmentioning

confidence: 99%

A compact circularly polarized dual port MIMO antenna with DGS and parasitic patch for modern wireless communication and IOT applications

Roges,

Sharma,

Malik

et al. 2024

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“…For conductor analysis, the characteristic mode theory was proposed in the year 1971 [40,41] and has been extensively utilized for the MIMO antenna design [16,[42][43][44][45]. In this current MIMO antenna analysis, various parameters of characteristic mode analysis like characteristic angle, eigenvalues and modal significance are introduced.…”

Section: Characteristic Mode Analysis Of the Proposed Techniquementioning

confidence: 99%

“…The Mode weight Coefficient (MWC) of the system with overall current J n and the contribution for nth mode is represented by with a symbol α n which is given by [44] as…”

Section: Characteristic Mode Analysis Of the Proposed Techniquementioning

confidence: 99%

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Deep learning assisted fractal slotted substrate MIMO antenna with characteristic mode analysis (CMA) for Sub-6 GHz n78 5 G NR applications: design, optimization and experimental validation

Babu,

Sudipta,

Sree

et al. 2023

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This article presents the design and optimization of a Deep Learning assisted MIMO antenna for 5G New Radio (NR) applications in Sub-6GHz band. The Prototype of the simulated geometry has been practically modelled and experimentally tested to validate the theoretical results. The optimized two-port MIMO antenna of 48 × 24 mm2 size is designed using fractal slotted substrate geometry. The concept of characteristic mode analysis (CMA) method is performed to characterize the performance of the proposed slotted substrate monopole MIMO Antenna. Usually, Optimization techniques based on traditional electromagnetic simulation tools (CST, HFSS, etc) are time-consuming for the design purpose of complex MIMO antenna geometries. The simulation studies using electromagnetic simulation tools are needed to be performed repeatedly to evaluate the optimum geometrical parameters for achieving better acceptable performance. In order to solve this issue, Deep Learning (DL) method-based design optimization approach is considered as an effective technique for determining the optimum physical parameters. In this article, Deep learning method based Dual-Channel type Deep Neural Network (DC-DNN) optimization technique is suggested to estimate the S-parameters. The generated data is fed to DC-DNN acting as a surrogate model to map the input features with the reflection and transmission coefficients, thereby enabling the search for the optimum design parameters to obtain the best performance. The diversity parameters are observed within acceptable limits and the characteristic parameters related to impedance and radiation performance are best suitable for lower sub-6 GHz n78 (3300–3800 MHz) 5G NR network applications.

“…In [26], the metamaterial acted as a building block to optimize impedance, isolation and gain. In [27], elliptical shaped stubs were used to improve isolation with Characteristic Mode Analysis. Through the analysis of the above literature, although these methods can improve the performance of antenna, but further increase the difficulty of design and technology.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of metasurface-based CPW-Fed UWB MIMO antenna for wireless communication systems

Li,

Yang,

Cheng

et al. 2023

A compact 4-port coplanar waveguide (CPW) fed ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna with enhanced isolation is proposed to operate from 3.66 GHz to 16.61 GHz with 127.78 % impedance bandwidth. The proposed antenna system consists of four orthogonal arrays of monopole antennas improved by four iterations.The UWB characteristic of the antenna is obtained from an improved monopole antenna fed by CPW. The final MIMO antenna is printed on a Rogers 4003C substrate with dimensions of 60 × 60 × 0.3 mm3.The orthogonal arrangement of antennas brings about the polarization diversity and certain isolation of MIMO antennas.Four rows of orthogonal metasurface elements with via holes and the ring of the backplane further improve the isolation between antenna elements in the MIMO system. The measured results of MIMO antenna agree with the simulated results. The MIMO antenna achieves an impedance bandwidth of 12.95 GHz with S11 < -10 dB and good isolation ( S21 = S41 < -30 dB and S31 < -20 dB). In particular, S31 is always less than -25 dB at frequencies greater than 6 GHz. The optimized MIMO antenna has the advantages of UWB, compact size, good radiation, and enhanced isolation, which shows that it has potential application value in UWB wireless communication systems.