Metallic Plasmonic Array Structures: Principles, Fabrications, Properties, and Applications (Adv. Mater. 50/2021)

AbstractIn the context of this research work, we study the so-called problem of full snapshot reconstruction in hybrid antenna array structures that are utilized in mmWave communication systems. It enables the recovery of the snapshots that would have been obtained if a conventional (non-hybrid) uniform linear antenna array was employed. The problem is considered at the receiver side where the hybrid architecture exploits in a novel way the antenna elements of a uniform linear array. To this end, the recommended scheme is properly designed so as to be applicable to overlapping and non-overlapping architectures. Moreover, the full snapshot recoverability is addressed for two cases, namely for time-varying and constant signal sources. Simulation results are also presented to illustrate the consistency between the theoretically predicted behaviors and the simulated results, and the performance of the proposed scheme in terms angle-of-arrival estimation, when compared to the conventional MUSIC algorithm and a recently proposed hybrid version of MUSIC (H-MUSIC).

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2D Antenna Array Structures for Hybrid Massive MIMO Precoding

GLOBECOM 2020 - 2020 IEEE Global Communications Conference ◽

10.1109/globecom42002.2020.9322477 ◽

2020 ◽

Author(s):

Mobeen Mahmood ◽

Asil Koc ◽

Tho Le-Ngoc

Keyword(s):

Antenna Array ◽

Massive Mimo ◽

Array Structures ◽

Mimo Precoding

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Fabrication and characterization of resistive double square loop arrays for ultra-wide bandwidth microwave absorption

Scientific Reports ◽

10.1038/s41598-021-91868-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Ji-Young Jeong ◽

Je-Ryung Lee ◽

Hyeonjin Park ◽

Joonkyo Jung ◽

Doo-Sun Choi ◽

...

Keyword(s):

Sheet Resistance ◽

Manufacturing Process ◽

End Milling ◽

Milling Process ◽

Wide Bandwidth ◽

Machined Surface ◽

Array Pattern ◽

Micro End Milling ◽

Array Structures ◽

Printing Processes

AbstractMicrowave absorbers using conductive ink are generally fabricated by printing an array pattern on a substrate to generate electromagnetic fields. However, screen printing processes are difficult to vary the sheet resistance values for different regions of the pattern on the same layer, because the printing process deposits materials at the same height over the entire surface of substrate. In this study, a promising manufacturing process was suggested for engraved resistive double square loop arrays with ultra-wide bandwidth microwave. The developed manufacturing process consists of a micro-end-milling, inking, and planing processes. A 144-number of double square loop array was precisely machined on a polymethyl methacrylate workpiece with the micro-end-milling process. After engraving array structures, the machined surface was completely covered with the developed conductive carbon ink with a sheet resistance of 15 Ω/sq. It was cured at room temperature. Excluding the ink that filled the machined double square loop array, overflowed ink was removed with the planing process to achieve full filled and isolated resistive array patterns. The fabricated microwave absorber showed a small radar cross-section with reflectance less than − 10 dB in the frequency band range of 8.0–14.6 GHz.

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DALLAS: Design automation language for logic array structures

Microprocessing and Microprogramming ◽

10.1016/0165-6074(87)90137-2 ◽

1987 ◽

Vol 20 (1-3) ◽

pp. 173-177

Author(s):

Paolo Lusiani

Keyword(s):

Design Automation ◽

Array Structures ◽

Logic Array

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Sunflower-Like Nanostructure with Built-In Hotspots for Alpha-Fetoprotein Detection

Molecules ◽

10.3390/molecules26041197 ◽

2021 ◽

Vol 26 (4) ◽

pp. 1197

Author(s):

Xiaoyu Zhao ◽

Aonan Zhu ◽

Yaxin Wang ◽

Yongjun Zhang ◽

Xiaolong Zhang

Keyword(s):

Rapid Detection ◽

Clinical Medicine ◽

Electromagnetic Coupling ◽

Low Cost ◽

Surface Enhanced Raman Spectroscopy ◽

Alpha Fetoprotein ◽

Low Concentrations ◽

Surface Enhanced Raman ◽

Active Substrate ◽

Array Structures

In the present study, a sunflower-like nanostructure array composed of a series of synaptic nanoparticles and nanospheres was manufactured through an efficient and low-cost colloidal lithography technique. The primary electromagnetic field contribution generated by the synaptic nanoparticles of the surface array structures was also determined by a finite-difference time-domain software to simulate the hotspots. This structure exhibited high repeatability and excellent sensitivity; hence, it was used as a surface-enhanced Raman spectroscopy (SERS) active substrate to achieve a rapid detection of ultra-low concentrations of Alpha-fetoprotein (AFP). This study demonstrates the design of a plasmonic structure with strong electromagnetic coupling, which can be used for the rapid detection of AFP concentration in clinical medicine.

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