Results 111 to 120 of about 735,881 (338)

Compact H-Plane CLAF-SIW Horn Antenna With Phase Front Correction

IEEE Access
This work presents an H-plane contactless air-filled substrate-integrated waveguide (CLAF-SIW) horn antenna, whose directivity is enhanced by incorporating a metalens along the horn flaring.
Andres Biedma-Perez, Cleofas Segura-Gomez, Angel Palomares-Caballero, Pablo Padilla   +3 more
doaj   +1 more source

Advances in Triboelectric Nanogenerators With Rotating Structure

Carbon Energy, EarlyView.
The rotating TENG has been widely studied for its superiorities of simple structure, high efficiency, and stable output. This review introduced the four different principles of rotating TENG and offered a thorough summary for performance and application research through three‐level classification. Importantly, the current existing problems, challenges,
Chuguo Zhang, Chunxu Xue, Yutong Chen, Yujie Qiang, Seeram Ramakrishna   +4 more
wiley   +1 more source

Nested Horn‐Based 3D‐Printed Dual‐Band High‐Gain Conical Beam Antenna

IET Microwaves, Antennas & Propagation
Dual‐band antennas have found extensive applications in the fields of communications, guidance, tracking systems, etc. However, traditional designs often struggle to simultaneously achieve high gain, wide impedance bandwidth and conical beam ...
Li Wu, Sipei Wu, Shuai Zhang, Hui Xue, Boyang Qian   +4 more
doaj   +1 more source

GO Shaping of Omnidirectional Dual-Reflector Antennas with Arbitrary Main-Beam Direction in Elevation Plane by Connecting Conic Sections

International Journal of Antennas and Propagation, 2018
This work discusses an alternative geometrical optics (GO) technique to synthesize omnidirectional dual-reflector antennas with uniform aperture phase distribution together with an arbitrary main-beam direction for the antenna radiation pattern. Sub- and
Rafael A. Penchel, Sandro R. Zang, José R. Bergmann, Fernando J. S. Moreira   +3 more
doaj   +1 more source

Review of millimeter‐wave and terahertz near‐field synthetic aperture radar imaging technology

InfoScience, EarlyView.
Abstract This paper comprehensively reviews the development of millimeter‐wave (MMW) and terahertz (THz) near‐field imaging technologies, with an emphasis on the state of synthetic aperture radar (SAR)‐based imaging technologies. Near‐field imaging technologies are categorized into passive and active imaging modes, among which active imaging is favored
Qi Yang, Hongqiang Wang, Xu Chen, Xin Peng   +3 more
wiley   +1 more source

Wideband 0.5–50 GHz double‐ridged guide horn antenna using coaxial‐to‐ridge waveguide launcher

IET Microwaves, Antennas & Propagation
Ever‐increasing bandwidth requirements from various industries drive the need for the ever‐increasing bandwidth of antennas used for testing.
Bennie Jacobs, Johann W. Odendaal, Johan Joubert   +2 more
doaj   +1 more source

A Modular Approach for the Design of Quadruple Ridged Flared Horn Antenna Feeds

IEEE Access
This paper presents the methodology followed for the design of a quad-ridged flared horn (QRFH) feed for the VLBI Global Observing System (VGOS) antennas.
Oscar Garcia-Perez, Felix Tercero, Alejandro Baldominos, Gabriel Gomez-Molina, Alberto Garcia-Merino, David Regajo-Rodriguez, Rocio Sanchez-Montero   +6 more
doaj   +1 more source

Perovskite‐based time‐domain signal‐balancing LiDAR sensor with centimeter depth resolution

InfoMat, EarlyView.
In this study, we present a monolithic high‐speed perovskite‐based photodetector capable of directly sensing the time delay between two light pulses with a temporal resolution of at least 170 ps. This outstanding time resolution is achieved through a signal‐balancing detection scheme that effectively overcomes the limitations of conventional ...
Gebhard J. Matt, Vitalii Bartosh, Joshua R. S. Lilly, Vincent J.‐Y. Lim, Lorenzo J. A. Ferraresi, Daria Proniakova, Yuliia Kominko, Gytis Juška, Laura M. Herz, Sergii Yakunin, Maksym V. Kovalenko   +10 more
wiley   +1 more source

New method for optimum design of pyramidal horn antennas

Journal of Microwaves, Optoelectronics and Electromagnetic Applications
This article introduces a procedure for determining the optimum design of pyramidal horn antennas. The efficiencies and phase errors in the optimum design are variables and depend on the design requirements.
Leandro de Paula Santos Pereira, Marco Antonio Brasil Terada   +1 more
doaj   +1 more source

Depolarization‐Based Multimodal Optical Imaging of Carious Lesions

Journal of Biophotonics, EarlyView.
Occlusal caries is visualized using non‐ionizing imaging techniques, including polarization‐sensitive OCT (PS‐OCT). The image collection captures different stages of lesion development and supports the interpretation of optical signals by comparison with histology.
Julia Grundmann, Christian Hannig, Svea Steuer, Tobias Rosenauer, Lars Kirsten, Edmund Koch, Jonas Golde, Julia Walther   +7 more
wiley   +1 more source