SOME RESULTS ON CYLINDRICAL CAVITY RESONATORS 



441 



of the fin. It would be reasonable to expect the Q of this mode to be appre- 

 ciably lowered because of the concentrated field there. If two fins at 90° 

 were present, there would be no orientation of the original TE \2n mode 

 which would satisfy the boundary conditions. In this case both new modes 



0,0.40 

 (M 



0.35 



UJ 



fin 



O 0.20 



$ 0.15 



0.05 



0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 



WIDTH OF FIN 

 RADIUS OF CYLINDER 



Fig. 15 — Constants for calculation of Q of TE Oln mode in cylinder with longitudinal 



would be perturbed in frequency from the original value. If both fins were 

 identical, the perturbations would be equal and a double degeneracy ensue. 

 Similar effects would happen to the other types of modes. 



The major advantage derivable from such effects would appear to be in 

 extraneous transmissions. The fin serves to orient positively the fields in 



