Results 51 to 60 of about 624,104 (285)

Ultra‐White Elastomeric Coatings for Daytime Radiative Cooling

Advanced Materials Technologies, EarlyView.
Passive daytime radiative cooling meets elasticity in a new class of ultra‐white silicone coatings. Combining high solar reflectance with strong sky‐window emission, they hold surfaces below ambient temperature under full sunlight while remaining flexible and stretchable. This combination of cooling performance and mechanical flexibility enables energy‐
Abdulrahman Aljwirah, Xiaojie Liu, Khalid Alhammadi, Orlando G. Rivera Gonzalez, Won‐June Lee, Xiulin Ruan   +5 more
wiley   +1 more source

Liquid‐Crystal‐Based Reconfigurable Intelligent Surface for 7 GHz Mobile Communication

Advanced Materials Technologies, EarlyView.
The glass‐based liquid‐crystal reconfigurable intelligent surface (LC‐RIS) integrates active‐matrix driving and blind‐greedy phase optimization within a 5G‐NR OFDM framework. This enables continuously tunable and autonomous enhancement of wireless coverage. Leveraging the transparency and manufacturability of liquid crystal panels, it is ideally suited
Tien‐Lun Ting, Yuh‐Chyi Chang, Yi‐Chan Hung, Cheng‐Yuan Hsiao, Chao‐Kai Wen, Tsung‐Hsien Lin   +5 more
wiley   +1 more source

A low‐profile wideband spiral antenna with multiple stopbands

IET Microwaves, Antennas & Propagation, 2023
A low‐profile spiral antenna with three stopbands (2.55 GHz band, 3.85 GHz band, and 5.45 GHz band) is developed. The stopbands are generated using three pairs of slots cut into the spiral arms.
Masahiro Tanabe, Hisamatsu Nakano
doaj   +1 more source

Current Sheet Antenna Array and 5G: Challenges, Recent Trends, Developments, and Future Directions

Sensors, 2022
Designing an ultra-wideband array antenna for fifth generation (5G) is challenging for the antenna designing community because of the highly fragmented electromagnetic spectrum.
Sajjad Hussain, Shi-Wei Qu, Abu Bakar Sharif, Hassan Sani Abubakar, Xiao-Hua Wang, Muhammad Ali Imran, Qammer H. Abbasi   +6 more
doaj   +1 more source

Moisture‐Adaptive Triboelectric Materials and Platforms: Design Strategies, Performance Enhancement, and Applications in Energy Harvesting and Wearable Electronics

Advanced Materials Technologies, EarlyView.
This review summarizes moisture‐adaptive strategies that enable triboelectric nanogenerators (TENGs) to operate across diverse moisture conditions. It examines moisture‐management methods, including exclusion, directional transport, removal, and utilization, with charge‐regulation approaches based on interfacial, dielectric, and structural engineering.
Junzhe Gan, Zhao Sha, Xuehua Zhang, Hoang‐Phuong Phan, Jin Zhang   +4 more
wiley   +1 more source

High-precision All-MXene-printed flexible ultra-wideband millimeter-wave endfire antennas based on spoof surface plasmon polaritons for wireless communication

npj Flexible Electronics
Flexible millimeter-wave (mmWave) antennas hold great promise for conformal integration across diverse devices and high-speed, large-channel capacity in 5G/6G wireless communications.
Feifei Lin, Hao Ni, Weiwei Zhao, Leilei Liu, Yijie Zhang, Zijing Huang, Wenjin Wang, Qixiang Wang, Tushun Wang, Yan Bai, Ning Ding, Shujuan Liu, Wei Huang, Qiang Zhao   +13 more
doaj   +1 more source

Compact dielectric impulse radiating antenna with a flat feed arm structure for low‐frequency gain enhancement

Electronics Letters, 2023
A compact dielectric impulse radiating antenna (IRA) with flat coplanar conical plate (CCP) feed arms was proposed for low‐frequency gain enhancement. An empirical equation was proposed to predict the characteristic impedance of the CCP arms submerged in
Junseop Lee, Kangwook Kim
doaj   +1 more source

Large‐Area Flat Optics Color Routing in Tilted Arrays of 2D Semiconductor Nanostripes

Advanced Optical Materials, EarlyView.
We develop a scalable flat optics platform exploiting self‐organised ion‐beam sputtering and maskless glancing‐angle deposition to fabricate centimetre‐scale arrays of tilted MoS2 nanostripes. The engineered geometry activates Rayleigh anomalies, guided modes, and Mie resonances, enabling highly directional color routing and enhanced light harvesting ...
Simone Di Marco, Daniele Ceneda, Matteo Barelli, Matteo Gardella, Rajesh Chennuboina, Maria C. Giordano, Marco Centini, Francesco Buatier de Mongeot   +7 more
wiley   +1 more source

Design of Ultra Wideband Antenna

International Journal of Recent Technology and Engineering (IJRTE), 2020
In this paper, A coplanar waveguide (CPW) ultra-wideband(UWB) antenna is designed, analyzed and simulated by computer simulation technology(CST). The proposed antenna is fabricated on FR-4 dielectric substrate. A microstrip feed line is used to excite the antenna.The ground plane is slotted to improve the impedance bandwidth (BW).
Anjaneyulu Katuru*, Sudhakar Alapati
openaire   +1 more source

Reconfigurable wideband patch antenna for cognitive radio [PDF]

, 2009
Cognitive radio communication is envisaged to be a new paradigm of methodologies for enhancing the performance of radio communication systems through the efficient utilization of radio spectrum.
AbuTarboush, HF, D. Budimir, Khan, S, Budimir, D, S. Khan, H. F. Abu Tarboush, R. Nilavalan, Nilavalan, R., Budimir, D., Khan, S., Nilavalan, R, Al-Raweshidy, H.S., AbuTarboush, H.F., Al-Raweshidy, H, H. S. Al-Raweshidy   +14 more
core   +1 more source