Results 61 to 70 of about 993 (170)

A Dual-Polarized Wideband Parabolic Reflector Antenna With High Aperture Efficiency and Low Sidelobe Level for L/S-Band Satellite Communications

IEEE Access
A dual-polarized (DP) wideband parabolic reflector antenna with high aperture efficiency and low sidelobe level is proposed for L/S-band vehicular satellite communications.
Xiao Ding, Xingxing Yang, Botao Feng, Chow-Yen-Desmond Sim, Sulin Wu, Kwok L. Chung   +5 more
doaj   +1 more source

Assessing the Underwater Impact of Aerodynamic Noise From Offshore Wind Turbines

Wind Energy, Volume 29, Issue 7, July 2026.
ABSTRACT The growing demand for offshore wind energy has led to a significant increase in wind turbine size and to the development of large‐scale wind farms, often comprising 100–150 turbines. However, the environmental impact of underwater noise emissions remains largely unaddressed.
Laura Botero‐Bolívar, Oscar A. Marino Sánchez, Martín de Frutos, Esteban Ferrer   +3 more
wiley   +1 more source

Quantitative Evaluation and Error Analysis of GPM DPR Rainfall Products (Version 07) Over Yangtze‐and‐Huai River Basin in China

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract The Dual‐Frequency Precipitation Radar (DPR) aboard the Global Precipitation Measurement (GPM) core satellite has advanced global precipitation monitoring with consistent long‐term data. This study evaluates the rainfall rate from GPM DPR version 07 Level‐2 products over the Yangtze‐and‐Huai River Basin with rain gauge observations.
Zelin Wang, Xiong Hu, Jing Sun, Weihua Ai, Zitong Chen, Liang Leng, Shensen Hu, Junqi Qiao, Xianbin Zhao   +8 more
wiley   +1 more source

Optimizing HAARP Beam Pattern for Generation of Strong F‐Region Field‐Aligned Irregularities

Radio Science, Volume 61, Issue 7, July 2026.
Abstract Field‐aligned irregularities (FAIs) are the signatures of plasma turbulence and convection in the mid‐ and high‐latitude F‐region ionosphere, and also provide coherent backscatter targets for HF radars. To serve irregularity generation and characterization studies, we conducted experiments at the High‐frequency Active Auroral Research Program (
T. S. Anderson, E. H. Lay, I. T. Cummings, C. A. Jeffery, P. A. Bernhardt, M. McCarrick, W. A. Bristow, S. J. Briczinski   +7 more
wiley   +1 more source

Low-Frequency Square Kilometer Array Pattern Optimization via Convex Programming

Applied Sciences
A well-known and powerful convex optimization strategy is exploited to enhance the electromagnetic performance of the Square Kilometer Array Low-Frequency radio telescope.
Giada Maria Battaglia, Giuseppe Caruso, Pietro Bolli, Maria Grazia Labate, Roberta Palmeri, Andrea Francesco Morabito   +5 more
doaj   +1 more source

Dual-Use Unimodular Sequence Design via Frequency Nulling Modulation

IEEE Access, 2018
This paper is focused on the design of the shared signal for a dual-use system with radar detection and communication functions. To achieve a good aperiodic autocorrelation property of the shared signal for radar detection, the lp-norm of the ...
Guolong Cui, Jing Yang, Shuping Lu, Xianxiang Yu, Lingjiang Kong   +4 more
doaj   +1 more source

Low Insertion‐Loss High Power X‐Band SPDT Transmit/Receive Switches in 250 nm GaN HEMT

Microwave and Optical Technology Letters, Volume 68, Issue 6, June 2026.
ABSTRACT We present three X‐band transmit/receive (T/R) switches utilizing single‐pole double‐throw (SPDT) structures in 250 nm GaN HEMT technology. The first T/R switch was designed to achieve low insertion loss by constructing the SPDT structure with a series λ/4 transmission line (T‐line) and meticulously selected two HEMT switches in parallel for ...
Tae‐Hoon Kim, Mun‐Kyo Lee, Soonyoung Hong, Jung‐Dong Park   +3 more
wiley   +1 more source

Eigenspace-Based Generalized Sidelobe Canceler Beamforming Applied to Medical Ultrasound Imaging

Sensors, 2016
The use of a generalized sidelobe canceler (GSC) can significantly improve the lateral resolution of medical ultrasound systems, but the contrast improvement isn’t satisfactory.
Jiake Li, Xiaodong Chen, Yi Wang, Wei Li, Daoyin Yu   +4 more
doaj   +1 more source

Subsurface Ventilation Processes in a Wind‐Driven Coastal System: Insights From the Gulf of Oristano (Italy)

Journal of Geophysical Research: Oceans, Volume 131, Issue 6, June 2026.
Abstract High‐resolution, year‐long observations (2023–2024) were conducted in the Gulf of Oristano, a shallow semi‐enclosed basin on the western coast of Sardinia, to address the scarcity of sustained in situ measurements resolving sub‐seasonal coastal processes in the Mediterranean.
Andrea Cucco, Giovanni Quattrocchi, Alberto Ribotti, Andrea Satta, Tasneem Ahmed, Jacobo Martin, Roberto Sorgente, Angelo Perilli, Fabio Antognarelli, James Dariush Karimi, Massimo Salvatore Giovanni Marras, Roberto Brundu, Matteo Sinerchia   +12 more
wiley   +1 more source

Dispersion‐Engineered Broadband Transparent Meta‐Cloak

Nanophotonics, Volume 15, Issue 9, 13 May 2026.
Achieving broadband performance remains a critical challenge in engineering physics. Here, theoretical derivation shows that the core phase compensation conditions for broadband transparent cloaking exhibit dispersive characteristics. A novel broadband transparent cloaking paradigm via dispersion engineering is proposed, and a meta‐cloak that realizes ...
Dan Liu, Xingshuo Cui, Chunsheng Guan, Xiaochun Liu, Wenye Ji, Fei Gao, Tong Cai   +6 more
wiley   +1 more source