Eigenspace Structure Estimation for Dual-Polarized Massive MIMO Systems Using an IDM-CGF Technique

Sarkar, Debdeep; Mikki, Said; Antar, Yahia M. M.

doi:10.1109/lawp.2019.2902369

Cited by 22 publications

(6 citation statements)

References 29 publications

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“…The researchers were able to create a more general way to deal with antenna directivity by putting together the infinitesimal dipole model and cross-correlation Green's function in a new formula [26]. Similar computations were also proven to be true [27]. They aimed to pursue their focus due to the fact that it would allow for better analysis and synthesis of antenna systems.…”

Section: Directivitymentioning

confidence: 99%

Effect of Dielectric Substrate on Dipole Antenna Directivity

Africa¹

2019

IJETER

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This paper aimed to determine how the directivity was affected by the dielectric substrate in the dipole antenna. The researchers had to choose different substrates and specific property of antennas in order to produce this study. Given all these substrates, the study focused on which of these would produce the best results that would be beneficial to antennas of a certain function. For this case, it is the directivity of the antenna that is being researched on. Through the use of the Matrix Laboratory (MATLAB) software, the researchers were able to conduct a comparative study on these different substrates to obtain their directivities. After the researchers conducted the simulation, the dielectric substrate, Fused Quartz was found to have the least value in directivity while Air had the highest directivity. Additionally, the researchers were able to deduce that the lower the constant of the material, the higher the directivity of the material. This showed that the relationship between the two variables was inversely proportional.

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Section: Directivitymentioning

confidence: 99%

Effect of Dielectric Substrate on Dipole Antenna Directivity

Africa¹

2019

IJETER

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“…Then by using MoMbased MATLAB Antenna Toolbox [27], we calculate spatial maps of reactive Helicity and EM Lagrangian density around multi-port antennas. Such studies would greatly benefit the design of multi-port antennas essential for MIMO (multipleinput multiple-output) configurations in wireless access points [28], massive MIMO arrays [29]- [30], near-field MIMO [31], full-duplex communication systems [32], as well as automotive MIMO Radars [33]- [34].…”

Section: Introductionmentioning

confidence: 99%

Antenna Mutual Coupling in Near-field: Insights using Reactive Helicity and EM Lagrangian Density

Sarkar¹,

Antar²

2023

Preprint

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<p>In this letter, we provide new insights into the mutual coupling between antennas, using spatial distribution of near-field reactive Helicity and period-averaged EM Lagrangian density. First, we analytically show that reactive Helicity (given by the real part of complex Helicity) in frequency domain always becomes zero in the far-field region of generic linearly and circularly polarized antennas. Furthermore, we introduce the concept of ‘instantaneous Helicity’ (analogous to instantaneous Poynting vector) to calculate reactive Helicity for antennas excited by arbitrary time-domain signals (eg. short-duration pulses). We analytically demonstrate the fundamental connection between this instantaneous Helicity, EM inertia density and EM Lagrangian density. Finally, using MoM-based MATLAB Antenna Toolbox, we compute the distribution (contour-plots) of normalized reactive Helicity and period-averaged Lagrangian density around a two-port system of thin-wire dipoles in frequency domain, revealing complex near-field inter-element interactions. Such visualization of mutual coupling via reactive Helicity and period-averaged EM Lagrangian density can enable antenna array designers to go beyond the traditional S-parameter approach, and identify regions containing near-zone non-TEM fields and non-propagating energy density, which may contribute constructively/destructively to the port-to-port mutual coupling. </p>

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“…Since, the wireless communication systems in 5G networks and beyond rely on multi-antenna configurations (arrays, multiple-input multiple-output or MIMO) both for transmitter and receiver modules, exploration of techniques to mitigate HOM effects in multi-band MIMO antennas becomes essential. The expected number of antennas for 5G user equipment (UE) is nearly 4-8 while the 5G base station focuses on larger scale antenna or massive-MIMO implemen- tation, where the expected antenna number is nearly 100 or more [13] - [17]. These multi-antenna system suffers from inter-element mutual coupling due to in-band fundamental frequency component and there are certain mutual coupling reduction techniques also available in literature to suppress the in-band effect only [18] - [20].…”

Section: Introductionmentioning

confidence: 99%

A Four-Port CSRR-Loaded Dual-Band MIMO Antenna With Suppressed Higher Order Modes

Dash

Sarkar

2022

IEEE Access

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In this paper, we propose a compact four-port dual-band MIMO antenna with suppressed higher order modes (HOMs). First, complementary split ring resonator (CSRR) loading is used on a square microstrip antenna to achieve simultaneous miniaturization and dual-band response. Next, the HOMs in the proposed CSRR loaded MIMO configuration are analysed using equivalent circuit model as well as surface current distribution plots. By placing a single shorting post close to antenna center line, these HOMs of the four-port dual-band MIMO antenna are then suppressed, while maintaining satisfactory mutual coupling (< −11 dB) and impedance matching (< −15 dB) performance in the operating band. Furthermore, simulated and measured values of total active reflection coefficient (TARC), envelop correlation coefficient (ECC) and channel capacity loss (CCL) are within the desired levels of −10 dB, 0.5 and 0.5 bits/s/Hz respectively, signifying good diversity performance of the proposed MIMO antenna. INDEX TERMSComplementary Split Ring Resonator (CSRR), Higher Order Modes (HOMs), Microstrip Antenna, Multiple Input Multiple Output (MIMO).

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Eigenspace Structure Estimation for Dual-Polarized Massive MIMO Systems Using an IDM-CGF Technique

Cited by 22 publications

References 29 publications

Effect of Dielectric Substrate on Dipole Antenna Directivity

Effect of Dielectric Substrate on Dipole Antenna Directivity

Antenna Mutual Coupling in Near-field: Insights using Reactive Helicity and EM Lagrangian Density

A Four-Port CSRR-Loaded Dual-Band MIMO Antenna With Suppressed Higher Order Modes

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