Results 61 to 70 of about 313,766 (176)

High-gain reflector feed for multibeam coverage

, 2018
The aim of this paper is to propose a novel multibeam antenna feed for reflector based radiating structures. Said feed relies on an overlapped topology, which reduces the distance between active elements and, therefore, the angular separation between ...
Caratelli, D.; id_orcid, Maximidis, R.T., Smolders, A.B.; id_orcid, Smolders, A.B., Caratelli, D., Toso, Giovanni, Smolders, AB Bart, R.T. Maximidis, G. Toso, Maximidis, R, Toso, G., Caratelli, D, D. Caratelli, A.B. Smolders   +13 more
core   +1 more source

Decadal‐Scale Bathymetric Change in a Shallow Coastal Bay

Journal of Geophysical Research: Oceans, Volume 131, Issue 9, September 2026.
Abstract Coastal marshes and bays must accumulate sediment to maintain their position relative to mean sea level during periods of sea level rise (SLR). Resuspension of bay‐bottom sediment, which together with tidal inundation promotes marsh deposition, is sensitive to water depth, but quantitative measurements of bathymetric change across shallow bays
Tyler E. Barnes, Qingguang Zhu, Patricia L. Wiberg   +2 more
wiley   +1 more source

Reconfigurable Multibeam Holographic Antenna Based on Liquid-Crystal Technology for Ka-Band LEO Satellite Application

IEEE Access
The requirements of low Earth orbit (LEO) satellite systems for high-precision and selective multiple coverage, have driven much interest and demand for millimeter-wave multibeam antennas.
Youngin Yoo, Jinki Park, Changjae Lee, Dong Ki Yoon, Seong-Ook Park   +4 more
doaj   +1 more source

Fluid Pathways and Sources Driving Recurring Pockmark Formation on the Chatham Rise, New Zealand

Basin Research, Volume 38, Issue 5, September‐October 2026.
Quasi‐3D seismic data interpretation and spatial pattern analysis indicate that pockmark formation on the SW Chatham Rise is likely driven by a combination of compaction‐related dewatering during polygonal faulting and silica diagenesis, coupled with deeply‐sourced, possibly CO2‐rich fluids from subducted limestones migrating along prominent basement ...
Fynn Warnke, Ingo A. Pecher, Lorna J. Strachan, Jess I. T. Hillman, Gareth Crutchley   +4 more
wiley   +1 more source

Low-complexity smart antenna methods for third-generation W-CDMA systems [PDF]

, 2000
There is still an open debate within the research community regarding the likely performance enhancement of smart antennas versus their complexity for commercial wireless applications.
Athanasiadou, GE, Piechocki, RJ, Tsoulos, G   +2 more
core   +1 more source

Best Feed Positions and Radiation Patterns of Typical Multibeam Dielectric Lens Antenna

IEEE Access
Multibeam base station antennas are introduced for 5G and 6G mobile communication systems. Considering higher frequency bands such as millimeter waves for 5G and terahertz for 6G, dielectric lens antennas become promising candidates due to their simple ...
M. Muhsin, Kamilia Kamardin, Yoshihide Yamada, Yoshiki Sugimoto, Kunio Sakakibara   +4 more
doaj   +1 more source

Beam-Switching Antenna Array Using Rotman Lens for Railway Communication at 28 GHz [PDF]

Journal of Electromagnetic Engineering and Science
In this paper, a multibeam antenna without a phase shifter is designed for railway communications in the upper 5G band (28 GHz). Railway turning angles can reach up to −20° to 20° depending on line geometry and train speed.
Hyeongjun Cho, Jaehyun Kim, Ashwini K. Arya, Chang-Woo Kim, Sanghoek Kim   +4 more
doaj   +1 more source

Planar Super‐Oscillation Diffractive Lenses: Practical Developments and Applications

Nanophotonics, Volume 15, Issue 16, 26 August 2026.
This review examines planar super‐oscillation diffractive lenses as a unified framework for super‐oscillatory lenses and supercritical lenses. It focuses on applications in super‐resolution imaging, micro/nanofabrication, and precision measurement and relates their application‐specific requirements to focal‐field control, multiobjective design ...
Yutian Cheng, Lingyi Tang, Xingcheng Xiao, Xiaochang Yu, Ya Guo, Yiting Yu, Wenli Li   +6 more
wiley   +1 more source

Wide-band planar inverted-F antenna for cognitive radio [PDF]

, 2009
A wide-band Planar Inverted-F Antenna (PIFA) is presented. The proposed antenna is simply structured consist of main patch supported by shorting wall and shorting pin, fed by 50 ohm microstrip transmission line. The antenna achieves an enhanced impedance
AbuTarboush, HF, Nilavalan, R, Budimir, D, Al-Raweshidy, H   +3 more
core   +3 more sources

Beamforming Analysis of Dual Beam Antenna Array Using Theory of Characteristic Modes

IEEE Open Journal of Antennas and Propagation
This paper presents a novel and insightful approach to beamforming a $2\times 2$ antenna array using the theory of characteristic modes. The array comprises four rectangular patch antenna elements designed on an FR-4 substrate resonating at 2.4 GHz ...
Mahrukh Khan, Talha Murad, Nicholas Lusdyk   +2 more
doaj   +1 more source