710 



THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1954 



OoQ 



D9 



in 6 



20 



30 



22 23 24 25 26 27 28 



FREQUENCY IN KMC 



Fig. 47 — Transfer and insertion loss versus frequency in the utilized modes of 

 the transducer of J'ig. 42 using all (112) coupling holes. 



m 50 



19 20 21 22 23 24 25 26 27 28 29 30 



FREQUENCY IN KMC 



Fig. 48 — Circular electric wave directivity and one unwantetl mode (TEuO 

 output versus frequency for the transducer of Fig. 42. 



