Antennas on metamaterial substrates as emitting components for THz biomedical imaging

Abstract

Terahertz technology is considered a viable option for medical imaging, since many biological and chemical agents exhibit signatures in this spectral domain. Ultimately, large biomolecules and protein strands will be accessible, enabled by the coupling of THz science with near-field probes. In this paper, we present the recent advances of our research regarding a novel 2-D THz imaging system that it is intended to be used for imaging and characterization of tissue and biomolecule samples associated to brain functionality. Herein, we specifically focus on the emitting elements of the system, by studying two types of THz planar antennas for THz emission: a rectangular and a bow-tie patch antenna working at 1 THz. The aim and novelty of this work is to present an effective THz antenna with high gain and to this end we use left-handed materials for the substrate.

High directivity microstrip antenna with stopband and passband frequency selective surfaces for 6G at low-THz

“…Not similar to that obtained in work [9], where experimental measurements did verification. While at work [7]- [9], and [10], [11], the simulation results were neither validated nor compared. At this work, like work [9], the wanted THz antenna design was done with the CST MWS software, while at works [7], [8] and [10], the modeling and simulating of the wanted THz antenna were made with an Ansys HFSS software.…”

“…According to [7], the authors modeled, optimized, and simulated with an Ansys high-frequency structure solver (HFSS), duo 1 THz antennas, with metamaterials for increasing the antenna's gain. The first was a microstrip antenna, and the second was a bow-tie patch antenna.…”

“…The BW, peak gain, and radiation efficiency attained were 800 GHz (100%), 13.2 dB, and 95%. Out of the reported published works [7]- [11], it can have been shown that there is still no high-directivity microstrip antenna with directivity beyond 25 dBi, and BW of more than 24%, which can be used for 6G cellular communication at low-THz at the resonance frequency of 144 GHz. This research investigates a low-THz antenna's design and simulation at a resonance frequency of 144 GHz, with good directivity and BW to establish a communication propagation range of over 100 m and enable a data rate of 20 Gb/s for 6G.…”

Effect of Metamaterial Cells Array on a Microstrip Patch Antenna Design

“…In [13], the SRR labyrinth geometry obtained an increase in BW by 600%, better voltage standing wave ratio (VSWR) by 1.5% and a miniaturized antenna by 400%. And an antenna for THz [20], obtained a high gain using a rectangular MTR type SRR.…”

In Situ Polymerization of Chiral Poly(fluorene-alt-benzothiadiazole) Nanocomposites with Enhanced Chirality

“…The research field of chiral photonics is an area of growing interest, with potential to contribute to applications ranging from negative-and near-zero refractive index metamaterials [1,2], to chiral bioimaging [3,4], to all-optical switching [5][6][7][8]. Realization of such applications, and the full potential of this field, demands materials with dramatically greater optical chirality than that observed in naturally occurring materials [9][10][11].…”