Operator method in electromagnetic waves diffraction by semi-infinite diaphragm system in rectangular waveguide problem

1997 ◽  
Vol 18 (4) ◽  
pp. 901-907 ◽  
Author(s):  
S. A. Pogarsky
Keyword(s):  
Rectangular Waveguide ◽  
Electromagnetic Waves ◽  
Operator Method ◽  
Diaphragm System ◽  
Waveguide Problem

ELECTROMAGNETIC WAVES RADIATION INTO THE SPACE OVER A SPHERE BY A SLOT IN THE END-WALL OF A SEMI-INFINITE RECTANGULAR WAVEGUIDE

2013 ◽  
Vol 46 ◽  
pp. 139-158 ◽  
Author(s):  
Sergey L. Berdnik ◽  
Yuriy M. Penkin ◽  
Victor A. Katrich ◽  
Mikhail V. Nesterenko ◽  
Victor I. Kijko
Keyword(s):  
Rectangular Waveguide ◽  
Electromagnetic Waves ◽  
End Wall

ELECTROMAGNETIC WAVES SCATTERING AND RADIATION BY VIBRATOR-SLOT STRUCTURE IN A RECTANGULAR WAVEGUIDE

2012 ◽  
Vol 24 ◽  
pp. 69-84 ◽  
Author(s):  
Mikhail V. Nesterenko ◽  
Victor A. Katrich ◽  
Dmitriy Yu. Penkin ◽  
Sergey L. Berdnik ◽  
Victor I. Kijko
Keyword(s):  
Rectangular Waveguide ◽  
Electromagnetic Waves ◽  
Slot Structure ◽  
Scattering And Radiation

scholarly journals A Proposed Approach to Determine the Edges in SAR images

2020 ◽  
pp. 185-192
Author(s):  
Rabab Farhan Abbas
Keyword(s):  
Edge Detection ◽  
Electromagnetic Waves ◽  
Operator Method ◽  
Bézier Curve ◽  
Bezier Curve ◽  
Edge Image ◽  
Sar Images ◽  
Wavelet Method ◽  
Radar Images ◽  
Sobel Operator

Radar is the most eminent device in the prolonged scattering era The mechanisms involve using electromagnetic waves to take Synthetic Aperture Radar (SAR) images for long reaching. The process of setting edges is one of the important processes used in many fields, including radar images, which assists in showing objects such as mobile vehicles, ships, aircraft, and meteorological and terrain forms. In order to accurately identify these objects, their edges must be detected. Many old-style methods are used to isolate the edges but they do not give good results in the  determination process. Conservative methods use an operator to detect the edges, such as the Sobel operator which is used to perform edge detection where the edge does not appear well.      The proposed method which combines Ridgelet transform, Bezier curve and Sobel operator is used to detect edges very efficiently. Ridghelet transform resolves the harms in the wavelet transform and it can well detect the edges in images. Bezier curve can profit gradual variation of the data and their mutability. Hence, the efficiency of the edged image is improved and, when used with Sobel operator, the quality of the edge image become very good. The data show that the advocated method has superior fallouts over the Sobel edge detection and the wavelet method in both subjective and impartial experiments. While the Peak Signal to Noise Ratio(PSNR) values were equal to 9.3812, 9.8918, 9.6521 and 9.0743using the Sobel operator method and to10.2564, 10.7927, 10.5612and 10.8633 using the wavelet method, they were increased in the proposed method to 12.6542, 12.9514, 12.8574 and 12.3013 respectively.

Solution of the Helmholtz equation for electromagnetic waves in an annular (segmented-annular) rectangular waveguide

2021 ◽  
Author(s):  
D.V. Semenov ◽  
D.S. Gudilin
Keyword(s):  
Electromagnetic Field ◽  
Helmholtz Equation ◽  
Rectangular Waveguide ◽  
Electromagnetic Waves ◽  
Point Of View ◽  
Practical Significance ◽  
Large Radius ◽  
Computing Systems ◽  
Bending Radius ◽  
Analytical Expressions

Formulation of the problem. When designing waveguides, spatial solutions are often in demand. However, from a methodological (including educational) point of view, mostly linear-extended structures with various sectional shapes are considered. The aim of this work is to consider a waveguide as a structure composed of segments bent in a plane with a certain radius. On the other hand, this solution is common for a plane-oriented waveguide path and, in the case of an infinitely large radius, converges to a solution for a straight waveguide. Practical significance. The presented solution of the Helmholtz equation for electromagnetic waves in an annular (segmentedannular) waveguide can be considered as a methodological basis for calculating a spatially oriented rectangular waveguide path. A step-by-step solution of the Helmholtz equation for a bent rectangular waveguide is presented; a methodology for determining the parameters of the electromagnetic field in a bent homogeneous waveguide is given. Expressions are derived for determining the parameters of the electromagnetic field components for waves of type E and H. General solutions are obtained that converge at an infinitely large bending radius to harmonic functions characteristic of solutions as applied to rectilinear waveguides. This technique can be applied both for analytical evaluation or numerical calculation and spatial modeling of waveguide parameters, and for designing the waveguide path as a whole. The presence of relatively simple analytical expressions greatly facilitates the task of analyzing and optimizing the waveguide path and building software and computing systems for their assessment, modeling and development.

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