OBLIQUE INCIDENCE PLANE WAVE SCATTERING FROM AN ...

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274 Henin, Elsherbeni, and Al Sharkawyzθ iφiincEy21.51x(a)Incident fieldScattered fieldInside fieldIncident + ScatteredE z0.50-0.50 60 120 180 240 300 360φ(degrees)1.5(b)10.5H z0Incident field-0.5 Scatte red fieldInside fieldIncident + Scattered-10 60 120 180 240 300 360φ (degrees)(c)Figure 10. Near field components of three parallel cylinders excited byan incident plane wave at θ i =30,φ i = 0. (a) The arrangement of thecylinders, (b) Continuity of the E z for TM z excitation, (c) Continuityof the H z for TE z excitation.
Progress In Electromagnetics Research, PIER 68, 2007275the outer surface of the array of cylinders which is not as smooth asit is in the one cylinder case. However, the agreement is acceptable tovalidate the TE z developed formulation.Figure 8 shows the echo width calculated from one conductingcylinder of radius 1λ, where the cylinder is excited by a TM z planewave with incident angel θ i = 45 and φ i = 0. The computed echo widthis compared with that of an array of 20 perfectly conducting cylindersof radius a =0.1λ, and all the cylinders are uniformly located on thecircumference of a circle of radius a =0.9λ. The results show excellent1.51.71.51.811.61.511.61.40.51.40.51.2y 0-0.5-11.31.21.110.9y 0-0.5-110.80.60.4-1.5-1 0 1x0.8-1.5-1 0 1x0.2(a)(b)1.5211.81.60.51.4y01.21-0.5-1-1.5-1 0 1x0.80.60.40.2(c)Figure 11. The near field distribution of a TM z plane wave incidenton array of three cylinders at incident angle. (a) θ i =30,φ i = 0, (b)θ i = 60, φ i = 0, (c) θ i = 90, φ i =0.
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