Results 21 to 30 of about 42,931 (308)

An Active VHF and UHF Electrically Small Horn Antenna Using Non-Foster Matching Circuit [PDF]

Iranian Journal of Electrical and Electronic Engineering, 2023
In this article, an active electrically small Horn antenna for very high frequency (VHF) and ultra-high frequency (UHF) frequencies is presented. The proposed horn antenna has a height of 5 cm and a diameter of 4.28 cm which can cover 6-12 GHz without a ...
Atefeh Sohrabi, hamideh dashti, Javad Ahmadi-shokouh   +2 more
doaj  

Circular Split Ring Resonator (C-SRR) Array Integrated Frequency-Notched Horn-Filtenna With Wide and Strong Rejection Band

IEEE Access, 2021
Linear-array of circular split ring resonators (C-SRR) integrated wideband notched filtering horn antenna with very strong rejection-band is proposed in this article.
Sandip Sankar Roy, Chinmoy Saha, Naresh Kumar Mallenahalli, Debdeep Sarkar   +3 more
doaj   +1 more source

Efek Jumlah Ridge terhadap Performansi Antena Horn untuk Aplikasi Tomografi

Jurnal Elkomika
ABSTRAK Paper ini membahas pengaruh jumlah profil ridge terhadap performansi antena horn untuk aplikasi tomografi. Penelitian ini mengobservasi dua variasi jumlah ridge, yaitu dua ridge dan empat ridge.
FOLIN OKTAFIANI, SULISTYANINGSIH SULISTYANINGSIH, ACHMAD MUNIR   +2 more
doaj   +1 more source

A Large Aperture UWB Antenna Array for Real Beam Radar Imaging

International Journal of Antennas and Propagation, 2012
The development of four-element ultra-wideband (UWB) comb taper slot antenna array with 18 cm element spacing for real beam radar imaging is described. The four-element UWB array system with optimum element spacing is analyzed by energy pattern.
Chao-Hsiang Liao, Dau-Chyrh Chang
doaj   +1 more source

An SIW Quasi-Pyramid Horn Antenna Based on Patch Coupling Feed for Automotive Radar Sensors

Remote Sensing
An SIW quasi-pyramidal horn antenna based on patch coupling feed with reduced machining difficulty and facilitated integration with the radar chip is proposed in this paper.
Pengchao Zhao, Na Li, Yiqun Zhang, Naigang Hu   +3 more
doaj   +1 more source

A Smart Magnetically Actuated Flip‐Disc Programmable Metasurface with Ultralow Power Consumption for Real‐Time Channel Control

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, Che Liu, Jia Cheng Li, Zhen Hao Fu, Yi Su Huang, Si Qi Huang, Lei Zhang, Jian Wei You, Tie Jun Cui   +8 more
wiley   +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, Yi Ning Zheng, Lei Zhang, Xiao Qing Chen, Giuseppe Castaldi, Tie Jun Cui, Vincenzo Galdi   +6 more
wiley   +1 more source

Shortened horn-reflector antenna [PDF]

, 1967
A shortened horn-reflector antenna overcomes the mechanical disadvantages and complexity of the conventional horn-reflector antenna. The shortened antenna offers broadband performance, economic construction, very low antenna temperature, and excellent ...
Lantz, P. A.
core   +1 more source

Lithium Intercalation in the Anisotropic Van Der Waals Semiconductor CrSBr

Advanced Functional Materials, EarlyView.
We report the lithium intercalation in the layered van der Waals crystal CrSBr, revealing strongly anisotropic ion‐migration dynamics. Optical and electrical characterization of exfoliated CrSBr shows lithium diffusion coefficients that differ by more than an order of magnitude along a‐ and b‐directions, consistent with molecular dynamics simulations ...
Kseniia Mosina, Aljoscha Söll, Jiří Šturala, Martin Veselý, Petr Levinsky, Ondřej Kaman, Florian Dirnberger, Giuliana Materzanini, Nicola Marzari, Gian‐Marco Rignanese, Borna Radatović, Vlastimil Mazánek, David Sedmidubský, Zdeněk Sofer   +13 more
wiley   +1 more source

Organometallic Precursor‐Induced Gradient Architecture on Multilayer Nanoporous Graphene Membranes for Precise Organic Solvent Nanofiltration

Advanced Functional Materials, EarlyView.
Alumina growth narrows surface pores and seals non‐selective defects, enhancing selectivity while preserving the nanoporous graphene architecture. Additionally, the deposition enables gradient‐controlled structural modification, with intergrown alumina acting as a physical cross‐linker that stabilizes the laminar structure.
Junhyeok Kang, Hwayong Lee, Suseong Hyun, Jiwon Kim, Ju Yeon Kim, Jeongyeob Oh, Yunseong Ji, Byungchan Han, Dae Woo Kim   +8 more
wiley   +1 more source