Results 201 to 210 of about 3,003 (240)

Coating‐Free Nanoscratching for Liquid‐Crystal Alignment on PCB‐Compatible Millimeter‐Wave Reflective Unit Cells

Advanced Materials Technologies, EarlyView.
Direct nanoscratching with a 500 nm diamond lapping film creates groove‐guided liquid‐crystal alignment interfaces on PCB‐compatible Cu‐patterned RF substrates within minutes, eliminating polymer coating and high‐temperature baking. The coating‐free process enables optical/molecular alignment validation and voltage‐programmable 28 GHz reflection‐phase ...
Junseok Ma, Ga‐Yeong Park, Geunjung Lee, Hyo‐Won Lee, Jong‐Won Yu, Dong Ki Yoon   +5 more
wiley   +1 more source

Ultrathin and Flexible Organic Light‐Addressable Potentiometric Sensors

Advanced Materials Technologies, EarlyView.
The first ultrathin, fully organic, and flexible light‐addressable potentiometric sensor (LAPS) is demonstrated. With a thickness of only 2.3–2.9 µm, this standalone film offers sensitivity to electrolyte potential and stable performance for over 170 days.
Ami Ichikawa, Yudai Hemmi, Yuanyuan Guo, Georgios Bairaktaris, Carl Frederik Werner, Tomohiko Murayama, Hiroyuki Matsui   +6 more
wiley   +1 more source

Wood‐Derived Nanocellulose‐Biocarbon Fresnel‐Zone Plate Lenses for Sub‐THz Frequency Applications

Advanced Materials Technologies, EarlyView.
Wood‐derived nanocellulose and lignin‐based biocarbon were combined to fabricate fully bio‐based Fresnel zone plate (FZP) lenses for sub‐terahertz frequencies. These sustainable FZP lenses exhibit low dielectric loss and high directivity, achieving performance comparable to that of metallic references, and remain functional under environmental stress ...
Riikka Haataja, Mikko Kokkonen, Niina Halonen, Sami Myllymäki, Umair Rafique, Mandeep Singh, Ossi Laitinen, Heli Jantunen, Kristiina Oksman, Henrikki Liimatainen   +9 more
wiley   +1 more source

Modular Binary Tree Architecture for Distributed Large Intelligent Surface [PDF]

ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2021
Large intelligent surface (LIS) is a technology that extends massive MIMO by considering an even greater number of antennas distributed throughout vast areas. In order to be able to implement this technology, it is crucial to consider decentralized architectures so as to make the whole system scalable.
Juan Vidal Alegría, Fredrik Rusek, Jesús Rodríguez Sánchez, Ove Edfors   +3 more
core   +4 more sources

Decentralized Equalizer Construction for Large Intelligent Surfaces [PDF]

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall), 2019
In this paper we present fully decentralized methods for calculating an approximate zero- forzing (ZF) equalizer in a large intelligent surface (LIS). A LIS is intended for wireless communication and facilitates unprecedented MU- MIMO performance, far superior to that of Massive MIMO.
Juan Vidal Alegría, Jesus Rodriguez Sanchez, Fredrik Rusek, Liang Liu 0002, Ove Edfors   +4 more
openaire   +2 more sources

On the Complexity Requirements of a Panel-Based Large Intelligent Surface [PDF]

GLOBECOM 2020 - 2020 IEEE Global Communications Conference, 2020
A Large Intelligent Surface (LIS) is a recently proposed concept, especially suitable for high speed indoor communications and industrial internet of things (IoT) applications. Basing the LIS on smaller panels has clear advantages in terms of flexibility and mass production of its elements.
Andreia Pereira, Fredrik Rusek, Marco Gomes 0001, Rui Dinis 0001   +3 more
openaire   +2 more sources

Initial Analysis of Dynamic Panel Activation for Large Intelligent Surfaces [PDF]

2021 IEEE Workshop on Signal Processing Systems (SiPS), 2021
Large intelligent surfaces (LIS) have the potential to be the beyond-massive-MIMO solution, even further improving spectral efficiency, coverage, reliability and other performance measures. They also open up for entirely new services, such as precise localization, environment sensing, and wireless energy transfer.
Nafiseh Seyed Mazloum, Ove Edfors
core   +4 more sources

Localization in NLOS Conditions using Large Reconfigurable Intelligent Surfaces [PDF]

2021 IEEE 22nd International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2021
This paper proposes a low-complexity practical algorithm to localize mobile users under NLOS channel conditions using a single base station and a large reconfigurable intelligent surface (RIS). The numerical results show the trade-off between localization accuracy and latency as well as the robustness of the localization algorithm to the presence of ...
Dardari D., Decarli N., Guerra A., Guidi F.   +3 more
openaire   +2 more sources

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Large Intelligent Surface-Based Generalized Index Modulation

IEEE Communications Letters, 2021
Novel communication technology based on large intelligent surface (LIS), which manipulates the phase of the incident waves to enhance the communication quality, has been proposed as a promising candidate for future wireless communication systems and standards.
Lechen Zhang, Xia Lei 0001, Yue Xiao 0001, Teng Ma 0007   +3 more
openaire   +1 more source

Beamspace Modeling of Multi-mode Communications with Large Intelligent Surfaces

2021 55th Asilomar Conference on Signals, Systems, and Computers, 2021
The use of large intelligent surfaces as antennas enables the realization of multiple communication modes even in line-of-sight conditions, thanks to the exploitation of the near-field propagation. Despite results for the number of communication modes are known for specific configurations (e.g., small antennas and paraxial scenario), ad-hoc models are ...
Decarli N., Dardari D.
openaire   +3 more sources