Efficient technique for mutual coupling calculations between apertures on a PEC circular cylinder covered with a dielectric layer

2001 ◽  
Author(s):  
P. Persson ◽  
R.G. Rojas
Keyword(s):  
Circular Cylinder ◽  
Dielectric Layer ◽  
Mutual Coupling ◽  
Efficient Technique

scholarly journals Miniaturized Coupling Structures for Decoupling PIFAs on Handheld Devices

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Qian Li ◽  
Yaxin Yu
Keyword(s):  
Electromagnetic Field ◽  
Correlation Coefficient ◽  
Dielectric Layer ◽  
Mutual Coupling ◽  
Ground Plane ◽  
Measured Data ◽  
Handheld Devices ◽  
Handheld Device ◽  
Small Spacing ◽  
Thin Dielectric Layer

One efficient approach is introduced in this paper to reduce mutual coupling and correlation coefficient for two closely placed PIFAs in a handheld device. The approach is based on one miniaturized structure which consists of two metallic layers, printed on either side of one thin dielectric layer. Due to the small spacing between two conducting patches, high electromagnetic field is induced within the dielectric layer. The geometry and position of this structure have been modified to decouple the PIFA array at 1.9 GHz and produce maximum miniaturization thereby occupying less space on a handheld device ground plane. By employing the proposed structures, a 20 dB reduction in mutual coupling is achieved. The correlation coefficient also reduces to 0.007278. The performance of the structure is validated by both simulated results and measured data obtained from several fabricated prototypes.

scholarly journals Решение задачи дифракции на теле вращения, расположенном в диэлектрическом слое

2019 ◽  
Vol 127 (12) ◽  
pp. 942
Author(s):  
С.А. Маненков
Keyword(s):  
Circular Cylinder ◽  
Plane Wave ◽  
Dielectric Layer ◽  
Layered Medium ◽  
Body Of Revolution ◽  
Dielectric Body ◽  
Material Characteristics ◽  
Homogeneous Spheroid

Two methods for solving the problem of diffraction of the plane wave by the dielectric body of revolution located in the homogeneous dielectric layer are proposed. Two methods are compared using the example of the scattering of the plane wave by the homogeneous spheroid and the circular cylinder of finite dimensions located in the layer. The results of calculating the pattern for the case of diffraction by the finite circular cylinder which is immersed in the layer and has variable material characteristics are presented. The wavelength dependences of the pattern for plasmon particles located in the layered medium are obtained.

Characterization of machined polystyrene foam

1989 ◽  
Vol 47 ◽  
pp. 372-373
Author(s):  
C. W. Price ◽  
E. F. Lindsey ◽  
R. M. Franks ◽  
M. A. Lane
Keyword(s):  
Surface Finish ◽  
Cell Walls ◽  
Surface Structures ◽  
Efficient Technique ◽  
Low Density ◽  
Polystyrene Foam ◽  
Planar Surfaces ◽  
Machining Characteristics

Diamond-point turning is an efficient technique for machining low-density polystyrene foam, and the surface finish can be substantially improved by grinding. However, both diamond-point turning and grinding tend to tear and fracture cell walls and leave asperities formed by agglomerations of fragmented cell walls. Vibratoming is proving to be an excellent technique to form planar surfaces in polystyrene, and the machining characteristics of vibratoming and diamond-point turning are compared.Our work has demonstrated that proper evaluation of surface structures in low density polystyrene foam requires stereoscopic examinations; tilts of + and − 3 1/2 degrees were used for the stereo pairs. Coating does not seriously distort low-density polystyrene foam. Therefore, the specimens were gold-palladium coated and examined in a Hitachi S-800 FESEM at 5 kV.

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