Near field transmission lines feed linearly polarized array antenna for built-in test

2005 ◽  
Author(s):  
Shii-Shyong Wang ◽  
Ruey-Shi Chu
Keyword(s):  
Transmission Lines ◽  
Near Field ◽  
Array Antenna ◽  
Linearly Polarized

scholarly journals Dual Linearly Polarized Microstrip Array Antenna

10.5772/8468 ◽  
2010 ◽  
Author(s):  
M. S. R Mohd Shah ◽  
M. Z. A Abdul Aziz ◽  
M. K. ◽  
M. K. A Rahim
Keyword(s):  
Array Antenna ◽  
Linearly Polarized ◽  
Microstrip Array ◽  
Microstrip Array Antenna

scholarly journals Plasmonic interference modulation for broadband nanofocusing

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shaobo Li ◽  
Shuming Yang ◽  
Fei Wang ◽  
Qiang Liu ◽  
Biyao Cheng ◽  
...  
Keyword(s):  
Near Field ◽  
Three Dimensional ◽  
Field Enhancement ◽  
Incident Beam ◽  
Plasmonic Mode ◽  
Resonant Structures ◽  
Interference Modulation ◽  
Near Field Imaging ◽  
Linearly Polarized ◽  
Radially Polarized

Abstract Metallic plasmonic probes have been successfully applied in near-field imaging, nanolithography, and Raman enhanced spectroscopy because of their ability to squeeze light into nanoscale and provide significant electric field enhancement. Most of these probes rely on nanometric alignment of incident beam and resonant structures with limited spectral bandwidth. This paper proposes and experimentally demonstrates an asymmetric fiber tip for broadband interference nanofocusing within its full optical wavelengths (500–800 nm) at the nanotip with 10 nm apex. The asymmetric geometry consisting of two semicircular slits rotates plasmonic polarization and converts the linearly polarized plasmonic mode to the radially polarized plasmonic mode when the linearly polarized beam couples to the optical fiber. The three-dimensional plasmonic modulation induces circumference interference and nanofocus of surface plasmons, which is significantly different from the nanofocusing through plasmon propagation and plasmon evolution. The plasmonic interference modulation provides fundamental insights into the plasmon engineering and has important applications in plasmon nanophotonic technologies.

Fast and numerically stable Mie solution of EM near field and absorption for stratified spheres

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Olivér Csernyava ◽  
Bálint Péter Horváth ◽  
Zsolt Badics ◽  
Sándor Bilicz
Keyword(s):  
Near Field ◽  
Human Head ◽  
Approximate Model ◽  
Head Model ◽  
Wave Regime ◽  
Content Type ◽  
Precise Calculation ◽  
Linearly Polarized ◽  
Numerical Instabilities ◽  
Computational Resources

Purpose The purpose of this paper is the development of an analytic computational model for electromagnetic (EM) wave scattering from spherical objects. The main application field is the modeling of electrically large objects, where the standard numerical techniques require huge computational resources. An example is full-wave modeling of the human head in the millimeter-wave regime. Hence, an approximate model or analytical approach is used. Design/methodology/approach The Mie–Debye theorem is used for calculating the EM scattering from a layered dielectric sphere. The evaluation of the analytical expressions involved in the infinite sum has several numerical instabilities, which makes the precise calculation a challenge. The model is validated through an application example with comparing results to numerical calculations (finite element method). The human head model is used with the approximation of a two-layer sphere, where the brain tissues and the cranial bones are represented by homogeneous materials. Findings A significant improvement is introduced for the stable calculation of the Mie coefficients of a core–shell stratified sphere illuminated by a linearly polarized EM plane wave. Using this technique, a semi-analytical expression is derived for the power loss in the sphere resulting in quick and accurate calculations. Originality/value Two methods are introduced in this work with the main objective of estimating the final precision of the results. This is an important aspect for potentially unstable calculations, and the existing implementations have not included this feature so far.

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