29.6 



oca 



0.04 0.08 0.12 0.16 0.20 0.24 0.28 0.32 0.36 0.40 



29.4 



29.2 



29.0 



/3a 



28.8 



26,6 



28.4 



2 8.2 



28.0 



1000 TEii 



TMqi 



1000 K") 



1000 



TE 



12 



1000 



TE 



13 

 1000 



"^ 



TM„ 



TMc 



TM,2 



TM, 



03 



W~^, 



(b) 



/3oa =29.554 

 f'=100 



0.04 0.08 0.12 0.16 0.20 0.24 0.28 0.32 0.36 0.40 



aa 



Fig. 2(a) and (b) 

 Fig. 2 — Plots of phase constant versus attenuation constant for modes in 

 various helix waveguides. Representative values of «" are shown on the curves. , 



1372 



