Asymptotic Solution of Some Diffraction Problems

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Asymptotic Solution of Some Diffraction Problems
Joseph Bishop Keller
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I 1. 0 . 9 . 8 . 7 . 6 . 5 u=0 -r- 4 kb. Fig. 11 The back scattering aii5)litvide A divided by the geometrical optics value ■>/b /2 ' as a function of kb » A denotes the absolute value of the amplitude of the field reflected frcan a circiilar cylinder of radius b when a plane wave is incident. It is given by (210) with o = Ji. ° - 68 - . , /b ~ ik(E- -j^ Bin |)| ^ (209) u ^ e^''^ / ^ sin I e ^1 * j^^;^ 8 *_2. Sin ^ sin . ^ (3- -4^). (^)^(9 »in I - ^). (^)'(«-15 . In^ |) 2« sii^ r ^=' - =in + . ...For the amplitude of the reflected far field we find instead of (205) /oinN 1A| 1 1 f 3, 1x17 6, 6U2 ^ 3, OU9 ^ . (16b k) sin J sm ^ sin ^ V^ o . A ^sin J The asymptotic form of (209) for the far field coincides with the result of I, Imai [2U] obtained by expansion of the explicit solution. As in the -2 previous case, he does not ?ive the term in k and therefore his result cannot be used to compute |A| given by (210) and shown in Figs. 11 and 12. 9. Axially symmetric waves To find the asymptotic expans'on of an axially symmetric field we introduce the coordinates s, p and (fl, Here ^ is the ordinary rotational angle of cylindrical coordinates and s, p are defined as above In the planes ^ = const.

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