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THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1954 



Thus the loss is neglected and only the non-reciprocal phase charac- 

 teristic is considered. The losses have then to be determined approxi- 

 mately by differentiation of the phase characteristics. 



A few further problems were considered as illustrations of the general 

 principles. One case, that of the plasma filling the space above an im- 

 pedance sheet can actually be solved analytically and provides a par- 

 ticularly clear demonstration of the non-reciprocity. The case of the 

 rectangular waveguide with a ferrite slab has already been considered 

 extensively elsewhere, and only the results for a thin slab are given here. 

 A problem with cylindrical symmetry is taken up in Section 3.3: a 

 cyUndrical waveguide fitted with a circumferentially magnetized cylinder 



Ph 1 



-3.5 

 -4.0 



0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 09 1.0 I.I 1.2 1.3 1.4 I. 



cr 



Fig. 3 — pff versus a for various p. 



