77/(7/7 Q RESONANT CAVITIES 



415 



major consideration need be given only to those modes which lie within the 

 rectangle of which the desired TE 0\n mode forms the diagonal. 



1.3 



1.2 



i>o|x 



a 



0.7 



0.5 



0.4 



1.0 



1.5 



L 



Fig. 3— Mode-shape factors \Qc\ as a function of diameter to length ratio ( y ) for cir- 

 cular cylinder resonator — TE modes with / = 0. 



Any nondiagonal mode is an extraneous mode. Those which do not 

 cross the desired mode within the frame are called interfering modes. They 

 act to give responses at more than one tuning point when the applied fre- 



