Results 51 to 60 of about 24,669 (252)

Stages of Structural and Parametric Synthesis of Low Earth Orbit Communication Systems with Broadband Inter-Satellite Links

RUDN Journal of Engineering Research
The paper discusses the scientific rationale for the structural and parametric synthesis of low Earth orbit communication systems (LEOCSs) with broadband inter-satellite links (ISLs) and on-board data routing, principles and stages underlying data ...
Sergey B. Pichugin
doaj   +1 more source

Multi Frequency Controllable In-Band Suppressions in a Broad Bandwidth Microstrip Filter Design for 5G Wi-Fi and Satellite Communication Systems Utilizing a Quad-Mode Stub-Loaded Resonator. [PDF]

Micromachines (Basel), 2023
Zhang G, Basit A, Khan MI, Daraz A, Saqib N, Zubir F.   +5 more
europepmc   +1 more source

Energy‐Transfer‐Driven Programmable Luminescence in Bi3+‐Eu3+ Co‐Doped Na3Ca2TaO6 Phosphors Toward Multifunctional Optical Applications

Advanced Optical Materials, EarlyView.
Energy transfer from broadband Bi3+ sensitizers to Eu3+ emitters enables composition‐, excitation‐, and temperature‐dependent luminescence in Na3Ca2TaO6. These controllable optical states support ratiometric thermometry and excitation‐selective, filter‐assisted information decoding in flexible phosphor–polydimethylsiloxane films, demonstrating how ...
Weiwei Xiang, Yuxiang Li, Jae Su Yu
wiley   +1 more source

Performance evaluation of compansion-based clipped OFDM systems

EURASIP Journal on Wireless Communications and Networking
The peak-to-average power ratio (PAPR), commonly used to describe the amplitude variations of an OFDM (orthogonal frequency-division multiplex) signal, does not accurately reflect its impact on the system performance.
Stephan Pfletschinger, Guido Dietl
doaj   +1 more source

Confinement‐Induced Nonlocality and Optical Nonlinearity of Transdimensional Titanium Nitride Films in the Epsilon‐Near‐Zero Region

Advanced Optical Materials, EarlyView.
The epsilon‐near‐zero (ENZ) effect in metals emerges only in nanometer‐scale films with exceptional optical quality. Titanium nitride (TiN) films grown by molecular beam epitaxy retain high crystallinity down to 2 nm and exhibit dramatically enhanced nonlinear optical responses near the ENZ region.
Fan‐Ting Tseng, I‐Hung Ho, Ting‐Jui Kuo, Shangjr Gwo, Igor V. Bondarev, Hyeyoung Ahn   +5 more
wiley   +1 more source

Cascading Spin‐Orbitronic Terahertz Emission in Ferromagnet/Nonmagnet Bilayers

Advanced Optical Materials, EarlyView.
While the initial generation mechanism of picosecond orbital currents remains elusive, we reveal a cascading spin–orbital transport mechanism that induces optically driven terahertz emission in ferromagnet/nonmagnet heterostructures. Using a ferromagnet with strong spin–orbit coupling, we identify a thickness‐driven transition from spin‐dominated to ...
Younghun Kim, Pinki Yadav, Byungwoo Son, Jooyoung Heo, Sejin Shin, Do‐Kyeong Ko, Rahul Mishra, Kyusup Lee   +7 more
wiley   +1 more source

Design and electromagnetic analysis of pyramidal and conical horn antenna for X-band satellite communication systems

Frontiers in Antennas and Propagation
The objective of this manuscript is to analyze and electromagnetically simulate two different horn antenna configurations, namely, a pyramidal horn antenna and a conical horn antenna.
Hatice-Andreea Topal, Teodor Lucian Grigorie   +1 more
doaj   +1 more source

Programmable Anisotropic Terahertz Permittivity via High‐Aspect‐Ratio 3D‐Printed Dielectric Mesh Networks

Advanced Optical Materials, EarlyView.
A 3D‐printed Terahertz (THz) anisotropic dielectric with programmable permittivity by varying infill density and creating high‐aspect‐ratio channels is presented. The proposed design was evaluated both experimentally, through THz time‐domain spectroscopy, and theoretically, through FDTD simulations and Effective Medium Theory analysis.
Chi Him Liu, Hwan Sik Kim, Andre Sarker Andy, Imad A.M. Ahmed, Yeong Hwan Ahn, Sang‐Soo Chee, Mira Naftaly, John E. Cunningham, Sae June Park   +8 more
wiley   +1 more source

Feasibility research on the use of IMT frequencies for direct-to-cell satellite communication

Dianxin kexue
Frequency selection is the primary consideration and technical foundation for launching satellites for direct to cell-satellite communication. To this end, the frequency selection for such communication systems was analyzed and studied.
ZHANG Lingfan, JI Tianxiang, CHENG Ritao, HUANG Yaoming, CAO Tianyang, ZHU Likun   +5 more
doaj   +2 more sources

Rapidly Deployable Satellite-Based Emergency Communications Infrastructure

IEEE Access
Communication infrastructure is crucial during emergencies because it ensures reliable coordination and information dissemination for effective search and rescue missions.
Francis Kagai, Philip Branch, Jason But, Rebecca Allen, Mark Rice   +4 more
doaj   +1 more source