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BELL SYSTEM TECHNICAL JOURNAL 



A "rising sun" resonator system for iV = 18 is shown in Fig. 26. The 

 distribution of its mode frequencies is shown in Fig. 27, together with dis- 

 tributions for unstrapped and strapped eighteen resonator systems which 

 have the same tt mode frequency. It is seen that the modes of the "rising 

 sun" resonator system arrange themselves into two groups or branches. 

 Since the anodes are quite "long" (approximately 3X/4) the distribution for 

 the unstrapped case having uniform resonator size [curve (a)] approximates 

 the distribution for an anode of infinite length. It is reversed from the 



Fig. 26. — A so-called "rising sun" type resonator sj'stem having eighteen resonators. 

 The slit at the "back" of the resonator in the right foreground is to be connected to the 

 output circuit (compare Fig. 30). 



unstrapped distribution of Fig. 25, curve (a), in which the end etfects upon 

 modes of small n are appreciable. 



In the system of two coupled resonators, whether or not they are tuned 

 individually to the same frequency, it has been seen that there are two 

 mode frequencies corresponding to oscillations of the coupled system in 

 which the resonators are in phase or tt radians out of phase. In the "rising 

 sun" system one observes two groups of mode frequencies corresponding to 

 oscillations of the coupled systems of resonators in which corresponding 



