5-6 MM ATTENUATION FOR THE CIRCULAR ELECTRIC WAVE 1117 





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Fig. 1 — General view of the circular waveguide lines and the millimeter wave 

 measuring equipment. 



ting die. Since the internal diameter is made as precise as possible, the 

 variations of outside diameter become a function of the tolerances of 

 both the internal diameter and wall thickness and cannot be as precise 

 as the inside of the pipe. Any thread cut relative to the outside diameter 

 as in regular plumbing practice, will not, in general, be concentric to the 



