Propagation Constants of Traveling Waves

Cover Propagation Constants of Traveling Waves
Propagation Constants of Traveling Waves
Mortimer Weitz
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(U).
- 6 - or, in view of (21), dE \ r 3r v * dr (25) 1 Ut J ) * ( Y 2 + k 2 ) 1 _ e / m J > v?(i P„ " Y)' o o E - 0. Z Thus f(r), the radial part of E, must satisfy z % a?(^'-r f " ' where J.
fo^ t 2 ~ 2 t e/m ' (27) h = p 1 v?(ip ■ Y) 4 e o o Hence (28) f(r) - A I O^r) + B K Q (>7r).
Since K„ is unbounded at the origin, we must set B = 0. Then we have (29) E - A I tyr) e iut "Y z .
z L For later use we wish to derive a relation concerning the radial logarith- mic derivative of (29) evaluated
...at the edge of the beam t 8E z r=b Specifically we want to show that for values of y satisfying (2) (and hence (3))> and for (3D J n yy^ n m C I^b) > ° • We first establish that under the above conditions, (33) I n ^ >0. We may rewrite (27) as follows: - 7 - , .. , >. 2 2 Kp 2 „ r + ik . Y - ik (3U) Y = P + . P . 2 " p " K y- ip -iP n ' ^ (Y-i P ) T ° ° where K is a positive constant: (35) K = ^ J q .
ev3 o o In (3U) the first term on the right, p 2, has a positive imaginary part (from (2)).


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