Results 91 to 100 of about 5,014,271 (379)
Reconfigurable electro-optic frequency shifter
, 2020 Here we demonstrate an on-chip electro-optic frequency shifter that is precisely controlled using only a single-tone microwave signal. This is accomplished by engineering the density of states of, and coupling between, optical modes in ultra-low loss electro-optic waveguides and resonators realized in lithium niobate nanophotonics.
Hu, Yaowen +9 more
openaire +2 more sources
Advanced Functional Materials, EarlyView.The study proposes a 1‐bit programmable metasurface based on flip‐disc display, named flip‐disc metasurface (FD‐MTS). This new design enables ultralow energy consumption while maintaining coding patterns. It also exhibits high scalability and multifunctional flexibility.
Jiang Han Bao +8 more
wiley +1 more source
Cognitive Radio for Emergency Networks [PDF]
, 2006 In the scope of the Adaptive Ad-hoc Freeband (AAF) project, an emergency network built on top of Cognitive Radio is proposed to alleviate the spectrum shortage problem which is the major limitation for emergency networks.
Kokkeler, A.B.J. +2 more
core +2 more sources
Metamaterial‐based frequency reconfigurable antenna
Electronics Letters, 2013 A frequency reconfigurable antenna based on metamaterial is presented. It is composed of a coplanar‐fed straight‐line monopole with two double split‐ring resonators (DSRRs) of different size disposed at its proximity. Each cell exhibits a negative permeability over a frequency band, which produces magnetic couplings with the monopole that starts to ...
H. Cheribi, F. Ghanem, H. Kimouche
openaire +1 more source
Three‐dimensional Antimony Sulfide Based Flat Optics
Advanced Functional Materials, EarlyView.This work presents the development of a grayscale electron beam lithography (g‐EBL) method for fabricating antimony trisulfide (Sb2S3) nanostructures with customizable 3D profiles. The refractive index of g‐EBL patterned Sb2S3 is determined based on the synergy of genetic algorithm and transfer matrix method.
Wei Wang +18 more
wiley +1 more source
IEEE Transactions on Antennas and Propagation, 2020 An automatic artificial intelligence (AI)-driven design procedure for mutual coupling reduction and a novel isolator are proposed for a frequency reconfigurable antenna array.
Jiahao Zhang +3 more
semanticscholar +1 more source
Joint Control of Radiated and Surface Waves via Space‐Time Coding Metasurfaces
Advanced Functional Materials, EarlyView.A unified space‐time coding metasurface platform enables simultaneous control of radiated and surface‐confined waves across multiple harmonics. Demonstrated functionalities include multi‐frequency beam shaping; surface‐wave excitation, and hybrid multiplexing.
Zihao Dai +6 more
wiley +1 more source
Small Square Reconfigurable Antenna with Switchable Single/Tri-Band Functions [PDF]
Radioengineering, 2016 A novel frequency reconfigurable slot antenna for suitable switchable radiations at WLAN and a tri-band at Bluetooth, WiMAX and upper WLAN applications is designed and fabricated.
M. Borhani Kakhki +3 more
doaj
Graphene Based Voltage Controlled Frequency Reconfigurable Antennas
2020 IEEE 40th International Conference on Electronics and Nanotechnology (ELNANO), 2020 Graphene based frequency reconfigurable antennas with different configurations are compared. Each antenna is composed of an inset-fed rectangular patch connected to one, two or three shorted stubs via graphene nanoplatelets. The reactance at the radiating edge of the patch is varied by varying the graphene resistance inducing a shift in the resonant ...
M. Yasir, Patrizia Savi
openaire +1 more source
Advanced Functional Materials, EarlyView.In situ monitoring of bulk photoalignment reveals how molecular weight, azobenzene content, cooling rate, and thickness govern ordering in main‐chain liquid crystalline polymers. Optimized copolymers exceed conventional thickness limits, maintaining stable alignment up to 130 µm with high energy efficiency and reversible optical patterning.
Jaechul Ju +3 more
wiley +1 more source