scholarly journals An accurate semi-numerical approach for multilayer metasurfaces with near-field coupling

2021 ◽  
Author(s):  
xi Gao ◽  
Xiongbin Wu ◽  
Kexin Li ◽  
Jin-hui Shi ◽  
Guofu Wang ◽  
...  
Keyword(s):  
Near Field ◽  
Numerical Approach ◽  
Field Coupling

scholarly journals A theoretical and numerical approach for selecting miniaturized antenna topologies on magneto-dielectric substrates

2015 ◽  
Vol 7 (3-4) ◽  
pp. 369-377 ◽  
Author(s):  
Alex Pacini ◽  
Alessandra Costanzo ◽  
Diego Masotti
Keyword(s):  
Near Field ◽  
Dielectric Materials ◽  
Numerical Approach ◽  
Operating Conditions ◽  
Microwave Range ◽  
Dielectric Substrates ◽  
Full Wave ◽  
Miniaturized Antenna ◽  
Wavelength Radiation ◽  
Definition Of

An increasing interest is arising in developing miniaturized antennas in the microwave range. However, even when the adopted antennas dimensions are small compared with the wavelength, radiation performances have to be preserved to keep the system-operating conditions. For this purpose, magneto-dielectric materials are currently exploited as promising substrates, which allows us to reduce antenna dimensions by exploiting both relative permittivity and permeability. In this paper, we address generic antennas in resonant conditions and we develop a general theoretical approach, not based on simplified equivalent models, to establish topologies most suitable for exploiting high permeability and/or high-permittivity substrates, for miniaturization purposes. A novel definition of the region pertaining to the antenna near-field and of the associated field strength is proposed. It is then showed that radiation efficiency and bandwidth can be preserved only by a selected combinations of antenna topologies and substrate characteristics. Indeed, by the proposed independent approach, we confirm that non-dispersive magneto-dielectric materials with relative permeability greater than unit, can be efficiently adopted only by antennas that are mainly represented by equivalent magnetic sources. Conversely, if equivalent electric sources are involved, the antenna performances are significantly degraded. The theoretical results are validated by full-wave numerical simulations of reference topologies.

Mechanism of Near-Field Coupling Between Noise Source and EMI Filter in Power Electronic Converter and Its Required Shielding

2019 ◽  
Vol 61 (5) ◽  
pp. 1663-1672 ◽  
Author(s):  
Keita Takahashi ◽  
Yuichiro Murata ◽  
Yusuke Tsubaki ◽  
Tetsuro Fujiwara ◽  
Hideto Maniwa ◽  
...  
Keyword(s):  
Noise Source ◽  
Near Field ◽  
Power Electronic ◽  
Field Coupling ◽  
Emi Filter ◽  
Power Electronic Converter

Analytical extraction of via near-field coupling using a multiple scattering approach

2013 ◽  
Author(s):  
Sebastian Muller ◽  
Andreas Hardock ◽  
Renato Rimolo-Donadio ◽  
Heinz-D. Bruns ◽  
Christian Schuster
Keyword(s):  
Multiple Scattering ◽  
Near Field ◽  
Field Coupling

Toroidal response due to strong near-field coupling in planar metamaterials (Conference Presentation)

2016 ◽  
Author(s):  
Alexey A. Basharin ◽  
Vitaliy Chuguevskiy ◽  
Maria Kafesaki ◽  
Eleftherios N. Economou ◽  
Alexey V. Ustinov
Keyword(s):  
Near Field ◽  
Field Coupling ◽  
Planar Metamaterials
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