CIRCULAR WAVEGUIDE WITH INHOMOGENEOUS DIELECTRIC 1251 



We have analyzed the compensator as if it were all on one side of the 

 bend; but it may evidently be divided into sections of total length U 

 which are distributed arbitrarily on both sides of the bend. An obvious 

 configuration would be to put a section of length UJ2 on each side of the 

 bend immediately adjacent to it. 



Limitations on the usefulness of this kind of compensator will be di- 

 electric losses and mode conversions. The former can presumably be re- 

 duced as the dissipation of available dielectrics is reduced. Mode conver- 

 sions could be calculated by the general methods of Part I, but one would 

 have to work out the values of the coupling coefficients between TMn 

 and all other modes, which has not yet been done. In any case it is likely 

 that the minimum tolerable bending radius would be no less than for the 

 within-the-bend compensators discussed earlier in this paper. 



REFERENCES 



1. M. Jouguet, Cables & Transmission, 1, pp. 133-153, 1947. 



2. S. O. Rice, unpublished memorandum. 



3. W. J. Albersheim, B. S. T. J., 28, pp. 1-32, January, 1949. 



4. S. E. Miller, Proc. I. R. E., 40, pp. 1104-1113, September, 1952. 



5. H. G. Unger, pp. 1253-1278, this i.ssue. 



6. S. A. Morgan and J. A. Young, B. S. T. J., 35, pp. 1347-1384, November, 1956. 



7. S. A. Schelkunoff, B. S. T. J., 31, pp. 784-801, July, 1952. 



8. S. E. Miller, B. S. T. J., 33, pp. 661-719, Mav, 1954; especially pp. 677-692. 



9. Reference 4, p. 1110. 



10. S. A. Schelkunoff, Electromagnetic Waves, D. Van Nostrand Co., Inc., New- 



York, 1943, pp. 12, 94. 



11. Reference 7, pp. 786-791. 



12. Reference 7, pp. 787-788. 



13. S. O. Rice, B. S. T. J., 27, pp. 305-.349, April, 1948; especially p. 348. 



14. Reference 8, pp. 692-693, Figs. 31 and 32. 



