Zobrazeno 1 - 10
of 471
pro vyhledávání: '"George V Eleftheriades"'
Publikováno v:
APL Photonics, Vol 8, Iss 5, Pp 056103-056103-12 (2023)
A point-spread function (PSF) that locally oscillates faster than its highest Fourier component can reconstruct the sub-diffraction information of objects in the far field without any near-field placements to break the diffraction limit. However, the
Externí odkaz:
https://doaj.org/article/f5ce1a82f86142019204c350efeaa92b
Publikováno v:
Engineering, Vol 11, Iss , Pp 21-26 (2022)
Externí odkaz:
https://doaj.org/article/246a452d596243eea0b9648f44c8533b
Publikováno v:
IEEE Access, Vol 10, Pp 130285-130292 (2022)
Over the past decades, many radome designs to extend the angular scan range of phased-array antennas have been devised by utilizing dielectric materials and metamaterials. More recently, metasurface technology such as planar lenses and beam deflector
Externí odkaz:
https://doaj.org/article/0c01ef5575034973a25420855d5c88a4
Publikováno v:
IEEE Access, Vol 10, Pp 25707-25717 (2022)
In this work, we present a study on the existence of Dirac type dispersion in the simplest of periodic metallic waveguide structures. It is shown that periodic repetitions of two dissimilar waveguides (WGs) can be properly designed to lead to a Dirac
Externí odkaz:
https://doaj.org/article/04dbbaaf942a49d6aa53bdbd34ed8276
Publikováno v:
IEEE Access, Vol 10, Pp 27783-27793 (2022)
In this paper, we describe the design and implementation of a frequency-scanned slotted waveguide antenna with a closed stopband which has a low sensitivity to the fabrication errors. The antenna is implemented as a slotted slow-wave waveguide by loa
Externí odkaz:
https://doaj.org/article/74fd6c91462d4f4daae4c8a0bfa3f7f5
Publikováno v:
IEEE Access, Vol 10, Pp 28670-28684 (2022)
We present the end-to-end design of compact passive and lossless metasurface antennas with integrated feeds. The complete low-profile system consists of a single-layered reactive impedance metasurface on top of a grounded dielectric substrate, and is
Externí odkaz:
https://doaj.org/article/d871aff5be4f41aeba8f7928a8bb6346
Publikováno v:
IEEE Open Journal of Antennas and Propagation, Vol 3, Pp 1141-1153 (2022)
We present a simple reconfigurable leaky-wave antenna (LWA) capable of fixed-frequency continuous beam-scanning, along with an efficient optimization procedure with which its radiation pattern can be shaped. To construct the LWA, an array of varactor
Externí odkaz:
https://doaj.org/article/915662edfc544a369006c82726452e90
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-14 (2021)
Two-dimensional antennas that can create and steer narrow beams are of interest for modern communication systems. Here, the authors demonstrate a scalable antenna array design that performs these functions with fewer elements than standard approaches
Externí odkaz:
https://doaj.org/article/63b972df4daa4cfaa83ca744ef4cebfe
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021)
Metasurfaces promise complex functionalities in electromagnetic wave control. Here the authors present an architecture for full-duplex reflective beamsteering based on series-connected radiative patches and nonreciprocal phase shifters.
Externí odkaz:
https://doaj.org/article/2c8b485575fb42aca5cdf3d166e356f5
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
Abstract Optical prisms are made of glass and map temporal frequencies into spatial frequencies by decomposing incident white light into its constituent colors and refract them into different directions. Conventional prisms suffer from their volumetr
Externí odkaz:
https://doaj.org/article/9b779429907c491780573a0ee7822900