Flexible Electromagnetic Cap for Head Imaging

Alqadami, Abdulrahman S. M.; Trakic, Adnan; Stancombe, Anthony E.; Mohammed, Beadaa; Bialkowski, Konstanty; Abbosh, Amin

doi:10.1109/tbcas.2020.3025341

Cited by 29 publications

(23 citation statements)

References 34 publications

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“…The use of metamaterials has been hugely successful in adapting conventional antenna designs into a Figure 1. A Wireless Body Area Network (WBAN) and its applications [1,[8][9][10][11][12][13][14][15][16].…”

Section: Virtuality and Realitymentioning

confidence: 99%

“…In entertainment, a personal media device with high speed communication capability will enable augmented/virtual/mixed reality interaction with users, and wirelessly communicate with a device such as glasses [12] or headset [13]. In military applications, WBAN can provide personal location and mobile communications by a helmet [14,15] or a smart watch [16], etc. Figure 1 shows some typical applications of WBANs.…”

Section: Introductionmentioning

confidence: 99%

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Meta-Wearable Antennas—A Review of Metamaterial Based Antennas in Wireless Body Area Networks

2020

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Wireless Body Area Network (WBAN) has attracted more and more attention in many sectors of society. As a critical component in these systems, wearable antennas suffer from several serious challenges, e.g., electromagnetic coupling between the human body and the antennas, different physical deformations, and widely varying operating environments, and thus, advanced design methods and techniques are urgently needed to alleviate these limitations. Recent developments have focused on the application of metamaterials in wearable antennas, which is a prospective area and has unique advantages. This article will review the key progress in metamaterial-based antennas for WBAN applications, including wearable antennas involved with composite right/left-handed transmission lines (CRLH TLs), wearable antennas based on metasurfaces, and reconfigurable wearable antennas based on tunable metamaterials. These structures have resulted in improved performance of wearable antennas with minimal effects on the human body, which consequently will result in more reliable wearable communication. In addition, various design methodologies of meta-wearable antennas are summarized, and the applications of wearable antennas by these methods are discussed.

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Section: Virtuality and Realitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Meta-Wearable Antennas—A Review of Metamaterial Based Antennas in Wireless Body Area Networks

2020

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“…Microwave head imaging is nowadays an emerging technology for the medical diagnostic system that has drawn a significant interest among researchers all over the world because of its cost-effective, nonionizing, non-invasive, and portable features 13 – 18 . This technology is capable of detecting the early cancerous tissues, hemorrhages, and other internal changes in the human head from the variances in electrical properties of head 19 , 20 . Radar scanning and tomography both are the approaches for image reconstruction, and in both cases, the antenna array is one of the main components as the performances of the antenna array determine the success of the system.…”

Section: Introductionmentioning

confidence: 99%

A portable non-invasive microwave based head imaging system using compact metamaterial loaded 3D unidirectional antenna for stroke detection

Islam

Almutairi

2022

Sci Rep

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A metamaterial (MTM) loaded compact three-dimensional antenna is presented for the portable, low-cost, non-invasive microwave head imaging system. The antenna has two slotted dipole elements with finite arrays of MTM unit cell and a folded parasitic patch that attains directional radiation patterns with 80% of fractional bandwidth. The operating frequency of the antenna is 1.95–4.5 GHz. The optimization of MTM unit cell is performed to increase the operational bandwidth, realized gain, and efficiency of the antenna within the frequency regime. It is also explored to improve radiation efficiency and gain when placed to head proximity. One-dimensional mathematical modelling is analyzed to precisely estimate the power distribution that validates the performance of the proposed antenna. To verify the imaging capability of the proposed system, an array of 9 antennas and a realistic three-dimensional tissue-emulating experimental semi-solid head phantom are fabricated and measured. The backscattered signal is collected from different antenna positions and processed by the updated Iterative Correction of Coherence Factor Delay-Multiply-and-Sum beamforming algorithm to reconstruct the hemorrhage images. The reconstructed images in simulation and experimental environment demonstrate the feasibility of the proposed system as a portable platform to successfully detect and locate the hemorrhages inside the brain.

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“…The received signal is fed to the Delay Multiply and Sum (DMAS) algorithm for image construction. In [ 11 ], a flexible electromagnetic cap has been designed that is embedded with 16 antenna elements and a matching layer. This is again a TD system that uses a 16-port Vector Network Analyzer (VNA).…”

Section: Introductionmentioning

confidence: 99%

Localization of Dielectric Anomalies with Multi-Monostatic S11 Using 2D MUSIC Algorithm with Spatial Smoothing

Borjali

Cho

2022

Sensors

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This article demonstrates that the complex value of S11 of an antenna, acquired in a multi-monostatic configuration, can be used for localization of a dielectric anomaly hidden inside a dielectric background medium when the antenna is placed close (~5 mm) to the geometry. It uses an Inverse Synthetic Aperture Radar (ISAR) imaging framework where data is acquired at multiple frequencies and look-angles. Initially, near-field scattering data are used for simulation to validate this methodology since the basic derivation of the Multiple Signal Classification (MUSIC) algorithm is based on the plain wave assumption. Later on, from an applications perspective, data acquisition is performed using an antipodal Vivaldi antenna that has eight constant-width slots on each arm. This antenna operates in a frequency range of 1 to 8.5 GHz and its S11 is fed to the 2D MUSIC algorithm with spatial smoothing whereas the antenna artifact and background effect are removed by subtracting the average S11 at each antenna location. Measurements reveal that this methodology gives accurate results with both homogeneous and inhomogeneous backgrounds because the size of data sub-arrays trades between the image noise and resolution, hence reducing the effect of inhomogeneity in the background. In addition to near-field ISAR imaging, this study can be used in the ongoing research on breast tumors and brain stroke detection, among others.

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Flexible Electromagnetic Cap for Head Imaging

Cited by 29 publications

References 34 publications

Meta-Wearable Antennas—A Review of Metamaterial Based Antennas in Wireless Body Area Networks

Meta-Wearable Antennas—A Review of Metamaterial Based Antennas in Wireless Body Area Networks

A portable non-invasive microwave based head imaging system using compact metamaterial loaded 3D unidirectional antenna for stroke detection

Localization of Dielectric Anomalies with Multi-Monostatic S11 Using 2D MUSIC Algorithm with Spatial Smoothing

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