On Diffraction By An Infinite Grating

Cover On Diffraction By An Infinite Grating
On Diffraction By An Infinite Grating
Fritz Reiche
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Vn / . V ^1>^/^ £ . Exp(-iky cosh P^) Z. ("^^ A^ • e:cp(-nP^) ■*■ > sinh P *— m _ n=-oo -8- where in the first stun over m, m is positive, and in the second, m is negatire.
— iait Eeintroducing the time factor e, we see that the scattered wares, infinite in n-umher, are !• siirf ace waves" propagated along the grating in both y- directions. Tne spatially damped " amplitudes " of these surface waves are I 2i e2p(-la: sinh 6 ) +op ~il50 ' H i \ • exp(n3jjj), for positive m m n=-oo \ " " kY (27) ,
... j _. EacpC-kz sinh p +oo B^ = - ^ • ^^^^ 2_ . YZ (-i)\- exp(-n3^). For negative m m n=-oo .... VI I in the directions (+y) and (-y) respectively, Ihe amplitudes B and B axe equal if (28) A_^ = A^ This is certainly the case if the cross-sections of the cylinders are circular and if the cylinders are perfect conductors, Eien we have (29) A J (ka) n n H^^^(ka) n (a is the radius of the cylinder).
We should note that for |m| = r- "both the factor cos a in the denomina- ^ I ti tor of B (see (Zk)) and the factor sinh 8 in the denominator of B and B (see (27)) hecome zero, hecause in this case a = T » P = 0« This would make t If m ^ m, the amplitudes B, B, B infinite.


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