Zobrazeno 1 - 10
of 2 009
pro vyhledávání: '"negative refractive index"'
Publikováno v:
IEEE Access, Vol 12, Pp 157657-157668 (2024)
Presented is the analysis and design of a leaky-wave antenna (LWA) that radiates an off-broadside beam with zero beam-squinting (ZBS), operating at a frequency of 5.5 GHz. A general design methodology is presented, which can be used to design any fix
Externí odkaz:
https://doaj.org/article/2fdce9ab2fd240ca8e6390704ef991c6
Publikováno v:
IEEE Access, Vol 12, Pp 16127-16150 (2024)
The aircraft collision avoidance system (ACAS) is a surveillance system required in all airplanes to ensure a safe flight. To locate the presence of any surrounding aircraft that may pose a threat, the ACAS sequentially scans the fixed sectors (0° t
Externí odkaz:
https://doaj.org/article/69313d0d02be4528af8e6c949f3db532
Publikováno v:
IEEE Access, Vol 12, Pp 7372-7381 (2024)
This article presents a 3D-metamaterial (3D-MTM) structure to enhance microstrip patch antenna gain. A 3D-MTM unit cell exhibits an MNG ( $\mu $ -negative) property with a high negative refractive index over the 2.36-2.53 GHz frequency range resonati
Externí odkaz:
https://doaj.org/article/e004c97125e245719f06854e227786ca
Autor:
Chaker Mohsen Saleh, Eqab Almajali, Anwar Jarndal, Jawad Yousaf, Saqer S. Alja'Afreh, Rony E. Amaya
Publikováno v:
IEEE Access, Vol 11, Pp 14928-14942 (2023)
This paper presents a very compact, wideband, and enhanced-gain antenna for 5G applications. A simple single-layer millimeter wave (mm-wave) metamaterial lens (meta-lens) is used to improve the gain, aperture efficiency, and gain bandwidth of a slott
Externí odkaz:
https://doaj.org/article/178d44a2a7334d358e8aa7179d3c13b3
Publikováno v:
Tạp chí Khoa học Đại học Đà Lạt, Pp 45-58 (2022)
In this work, we study the generation of a negative refractive index based on electromagnetically induced transparency (EIT) in a Rb four-level N-type atomic gas medium. We derive analytic expressions for the relative permittivity and relative permea
Externí odkaz:
https://doaj.org/article/385f334d9ceb4303b3f0f47bab1b4672
Autor:
Komal Iqbal, Qasim Umar Khan
Publikováno v:
IEEE Access, Vol 10, Pp 112368-112391 (2022)
A thorough review of metasurfaces (2D planar counterpart of metamaterials) based on electromagnetic (EM) classification i.e., $\varepsilon $ -negative (ENG), $\mu $ -negative (MNG), and double-negative (DNG) materials is presented in this paper. The
Externí odkaz:
https://doaj.org/article/a05e4ff154024e63bedfe99a81722737
Publikováno v:
IEEE Access, Vol 10, Pp 99790-99812 (2022)
In this paper, a unique negative refractive index-metamaterial (NRI-MTM) structure is proposed for traffic alert and collision avoidance system (TCAS) for aircraft application. The NRI-MTM unit-cell structure is a combination of square and circular s
Externí odkaz:
https://doaj.org/article/933581d7888942829b48f2ea7fb3ec15
Publikováno v:
Materials & Design, Vol 219, Iss , Pp 110832- (2022)
We present a topology optimization method for the design of labyrinthine metamaterials with a large path length for acoustic wave propagation. An objective function maximizes the pressure gradient in an air-filled region at a low frequency, and a lev
Externí odkaz:
https://doaj.org/article/7b68daf7711b4ec086622c699dbb9cd5