598 



THE BELL SYSTEM TECHNICAL JOURXAL, MARCH 1957 



0.060" 



I 



n = 30 EQUIVALENT UNIFORM HOLES 



FOR ONE ROW 

 HOLE SIZE =0.030" X 0.627" 

 SPACING — 0.660" 



10.622" 

 0.211" 



Fig. 5 — 6-kmc coupler sketch. 



1.0 



_i 



UJ 



5 0.8 

 o 



ID 



o 



? 0.6 



o 



cr 



UJ 



u. 



z 

 < 



i- 



0.4 



0.2 



5.6 



5.8 



6.0 6.2 6.4 6.6 6.8 



FREQUENCY IN K ILOMEGACYL ES 



7.0 



7.2 



Fig. 6 — Transfer loss of 6-kmc coupler. 



