Results 21 to 30 of about 14,576 (298)
Near-zero-index-featured multi-band highly directional radiator with large Purcell factors
Results in Physics, 2022 Near-zero-index medium could be used to produce perfect planar wave beams, allowing for the design of compact antennas, but implementation is difficult due to the bandwidth and loss limitations.
Yichao Liu +4 more
doaj +1 more source
Directive Emission from Defect-Free Dodecagonal Photonic Quasicrystals: A Leaky-Wave Characterization [PDF]
, 2009 In this paper, we study the radiation from embedded sources in two-dimensional finite-size "photonic-quasicrystal" (PQC) slabs made of dielectric rods arranged according to a 12-fold symmetric aperiodic tiling.
Capolino, Filippo +6 more
core +3 more sources
Performance of hemielliptic dielectric lens antennas with optimal edge illumination [PDF]
, 2009 The role of edge illumination in the performance of compact-size dielectric lens antennas (DLAs) is studied in accurate manner using a highly efficient algorithm based on the combination of the Muller boundary integral equations and the method of ...
Boriskin, A. V. +2 more
core +3 more sources
Leaky-Wave antennas with arbitrary radiation based on bianisotropic Huygens’ metasurfaces [PDF]
, 2018 In this contribution, we present the application of Huygens’ metasurfaces (HMS) to the arbitrary design of leaky-wave antennas (LWAs). These metasurfaces have demonstrated their capabiity to tailor the electromagnetic waves at will. We use them to design
Abdo-Sánchez, Elena +2 more
core +1 more source
Manipulating the directivity of antennas with metamaterial
Optics Express, 2008 In this paper we use spatially variant metamaterial substrate to manipulate the directivity of antennas. We show theoretically that by embedding a dipole at different locations inside this substrate, the emitted rays can be directed to different orientations as required.
Jingjing, Zhang +3 more
openaire +2 more sources
Medycyna Pracy, 2013 Background: The activities of rescue and uniformed services require the use of wireless communication devices, such as portable radiophones. Assessment of workers' exposure to electromagnetic fields emitted by radiophones is important in view of ...
Krzysztof Gryz +3 more
doaj +1 more source
Fractal Antennas: An Historical Perspective
Fractal and Fractional, 2020 Fractal geometry has been proven to be useful in several disciplines. In the field of antenna engineering, fractal geometry is useful to design small and multiband antenna and arrays, and high-directive elements.
Jaume Anguera +7 more
doaj +1 more source
Antennas with controlled directivity patterns [PDF]
RADIOFIZIKA I ELEKTRONIKA, 2017 The current methods and devices for correcting and controlling the directivity patterns of metal whip and loop reconfigurable antennas, as well as plasma and electron beam reconfigurable antennas are investigated. It is proposed to solve the problem of effective correction and control of antenna directivity patterns by changing their design and ...
openaire +1 more source
Directive properties of active coated nano-particles
Advanced Electromagnetics, 2012 The directivities of the fields radiated by a variety of cylindrical and spherical active coated nano-particles, which are excited by their respective sources of illumination at optical frequencies, are investigated.
S. Arslanagić, R. W. Ziolkowski
doaj +1 more source
Electronic Beam-Scanning Antenna Based on a Reconfigurable Phase-Modulated Metasurface
Sensors, 2022 Metasurfaces (MSs) have enabled the emergence of new ideas and solutions in the design of antennas and for the control of electromagnetic waves. In this work, we propose to design a directional high-gain reconfigurable planar antenna based on a phase ...
Zakaria Zouhdi +2 more
doaj +1 more source