Multi-Mode Surface Wave Diffraction by a Wedge

1974 ◽  
Vol 26 (3) ◽  
pp. 531-538 ◽  
Author(s):  
Richard C. Morgan ◽  
Samuel N. Karp
Keyword(s):  
Surface Wave ◽  
Wave Diffraction ◽  
Multi Mode

A Technique of Scan Blindness Elimination for Planar Phased Array Antenna using Miniaturized EBG

2014 ◽  
Vol 69 (2) ◽  
Author(s):  
M. S. M. Isa ◽  
R. J. Langley ◽  
S. Khamas ◽  
A. A. M. Isa ◽  
M. S. I. M. Zin ◽  
...  
Keyword(s):  
Surface Wave ◽  
Band Gap ◽  
Radiation Pattern ◽  
Phased Array ◽  
Elevation Angle ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Electromagnetic Band Gap ◽  
Novel Technique ◽  
Wave Effects

In this paper, the planar phased array antenna scan blindness characteristic has been analyzed and a novel technique of eliminating the scan blindness for the phased array antenna has been introduced. The scan blindness of the center element has been used to present the entire phased array characteristic. The array scan blindness characteristics have been simulated and analyzed using CST Microwave Studio (CST MWS). The 5×3 planar phased array antenna radiation patterns against the pattern elevation angle direction has been simulated and compiled. The array’s scan blindness has been determined at the angle of approximately 47⁰. The miniaturized capacitive loaded Electromagnetic Band Gap (EBG) has been developed and introduced between the array elements to eliminate the problem. Based on the simulated results, it is shown that the use of a miniaturized EBG is effective in reducing the surface wave effects and eliminates the scan blindness in the array radiation pattern. This novel finding is very useful to improve the antenna directive efficiency for the directional radar and satellite application.

Wave diffraction in a two-fluid system

1969 ◽  
Vol 36 (1) ◽  
pp. 65-73 ◽  
Author(s):  
R. E. Kelly
Keyword(s):  
Approximate Solution ◽  
Surface Wave ◽  
Wave Diffraction ◽  
Bottom Topography ◽  
Density Ratio ◽  
Frequency Parameter ◽  
Step Change ◽  
Shallow Water Theory ◽  
Fluid System ◽  
Two Fluid

Wave diffraction due to a step change in bottom topography is considered for the case of two superimposed fluids of different, but constant, densities. The interface lies below the upper surface of the step. Shallow water theory is shown to be applicable only if the ratio of a non-dimensional frequency parameter to the departure of the density ratio from unity is sufficiently small. An approximate solution of the full equations, obtained by a method applied by Miles (1967) to surface wave diffraction, yields results limited only by the condition that the frequency parameter be small.

On the surface wave diffraction by a wedge

1965 ◽  
Vol 13 (1) ◽  
pp. 159-164 ◽  
Author(s):  
T. Chu ◽  
R. Kouyoumjian
Keyword(s):  
Surface Wave ◽  
Wave Diffraction
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