REDUCTION OF SKIN EFFECT LOSSES 529 



which will be recognized as approximately the skin depth given in equa- 

 tion (III-44). 



Alternatively, we see that the attenuation as a function of frequency 

 remains constant from low frequencies up to the point where 8 satisfies 

 equation (B-14). At higher frequencies, the attenuation increases para- 

 bolically. At frequencies where 8<^W, the attenuation will clearly corre- 

 spond to propagation in a parallel plate transmission line of width / and 

 will therefore increase with the square root of the frequency. This behavior 

 is similar to that discussed in Section I for a fine with a thin stack of lam- 

 inations on its inner conductor. 



