High-frequency analysis of electromagnetic scattering due to a dielectric cylinder

1995 ◽  
Vol 78 (4) ◽  
pp. 41-55 ◽  
Author(s):  
Takayuki Sasamori ◽  
Toru Uno ◽  
Saburo Adachi
Keyword(s):  
Frequency Analysis ◽  
Electromagnetic Scattering ◽  
High Frequency ◽  
Dielectric Cylinder

A geometric optics model for high‐frequency electromagnetic scattering from dielectric cylinders

Geophysics ◽  
2001 ◽  
Vol 66 (4) ◽  
pp. 1130-1140 ◽  
Author(s):  
François Baumgartner ◽  
Jens Munk ◽  
Jeffrey Daniels
Keyword(s):  
Electromagnetic Scattering ◽  
High Frequency ◽  
Specular Reflection ◽  
Dielectric Cylinder ◽  
Geometric Optics ◽  
Geophysical Modeling ◽  
Specular Reflections ◽  
Wide Range ◽  
The Time Domain ◽  
Ground Penetrating

The cylinder is a fundamental shape for (2‐D) geophysical modeling, and cylindrical objects (e.g., pipes) are a common target for ground penetrating radar. This paper presents physical and theoretical model responses for a cylinder which provide insight into responses that can be anticipated in field data. We calculate the exact expressions for the scattered field components of an obliquely incident plane wave over an infinitely long homogeneous dielectric cylinder and express them in the time domain. We project the field on a horizontal plane over the dielectric cylinder and interpret them for a large range of permittivity contrasts. The high‐frequency approximation presented in this paper includes the processes of specular reflection and critical refraction, which satisfy Snell’s law. Assuming the velocity of the surface waves is equal to the velocity of the fastest medium, and assuming their travel path is the shortest one possible, we derive a geometric optics model which is valid over a wide range of permittivities. We show that the critically refracted response can be separated and measured from the specular reflections in the received signal. The identification and isolation of these different responses of the bistatic measurements enable a characterization of the target’s properties, such as its size, orientation, and formation. We confirm our theoretical results by comparison with measurements using a physical model.

High Frequency Analysis of the Vivaldi Antenna Parameters

2020 ◽  
Author(s):  
Claudia Constantinescu ◽  
Calin Munteanu ◽  
Laura Grindei ◽  
Adina Giurgiuman ◽  
Claudia Pacurar ◽  
...  
Keyword(s):  
Frequency Analysis ◽  
High Frequency ◽  
Vivaldi Antenna

F.E.T. high-frequency analysis

1966 ◽  
Vol 113 (11) ◽  
pp. 1755 ◽  
Author(s):  
B. Reddy ◽  
F.N. Trofimenkoff
Keyword(s):  
Frequency Analysis ◽  
High Frequency
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