Materials Map

Discover the materials research landscape. Find experts, partners, networks.

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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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in Cooperation with on an Cooperation-Score of 37%

Topics

Publications (2/2 displayed)

  • 2019Wearable electromagnetic head imaging using magnetic-based antenna arrays3citations
  • 2019Compact unidirectional conformal antenna based on flexible high permittivity custom-made substrate for wearable wideband electromagnetic head imaging system109citations

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Chart of shared publication
Bialkowski, Konstanty
1 / 16 shared
Nguyen-Trong, Nghia
2 / 3 shared
Heitzmann, Michael Tobias
1 / 1 shared
Mohammed, Beadaa
1 / 9 shared
Chart of publication period
2019

Co-Authors (by relevance)

  • Bialkowski, Konstanty
  • Nguyen-Trong, Nghia
  • Heitzmann, Michael Tobias
  • Mohammed, Beadaa
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article

Compact unidirectional conformal antenna based on flexible high permittivity custom-made substrate for wearable wideband electromagnetic head imaging system

  • Heitzmann, Michael Tobias
  • Stancombe, Anthony
  • Nguyen-Trong, Nghia
  • Mohammed, Beadaa
Abstract

An approach toward designing and building of a compact, low-profile, wideband, unidirectional, and conformal imaging antenna for electromagnetic (EM) head imaging systems is presented. The approach includes the realization of a custom-made flexible high-permittivity dielectric substrate to achieve a compact sensing antenna. The developed composite substrate is built using silicon-based poly-di-methyl-siloxane (PDMS) matrix and microscale of aluminium oxide (Al 2 O 3 ) and graphite (G) powders. Al 2 O 3 and G powders are used as fillers with different weight-ratio to manipulate and control the dielectric properties of the substrate for attaining better matched with the human head and reducing antenna’s physical size while keeping the PDMS flexibility feature. Using the custom-made substrate, a compact, wideband, and unidirectional on-body matched antenna for wearable EM head imaging system is realized. The antenna is configured as a multi-slot planar structure with four shorting pins, working as electric and magnetic dipoles at different frequency bands. The measured reflection coefficient (S11) shows an operating frequency band of 1–4.3 GHz. The time-average power density and the amplitude of the received signal inside the MRI-based realistic head phantom demonstrate a unidirectional propagation and high-fidelity factor (FF) of more than 90%. An array of 13 antennas are fabricated and tested on a realistic 3-D head phantom to verify the imaging capability of the proposed antenna. The reconstructed images of different targets inside the head phantom demonstrate the possibility of utilizing the conformal antenna arrays to detect and locate abnormality inside the brain using multistatic delay-multiply-and-sum beamforming algorithm.

Topics
  • density
  • impedance spectroscopy
  • aluminum oxide
  • aluminium
  • composite
  • Silicon