MAGNETRON AS GENERATOR OF CENTIMETER WAVES 



233 



into the magnetron, preferably inside the vacuum envelope where any large 

 standing waves present are less likely to cause RF voltage breakdown. 



(a) 



x 



:C L< 



"X 



J7 

 J" 



T I LOAD 



I 



I 



(b) 



(c) 



LOAD 



1 



3 



T I LOAD 



(d) 



Fig. 29. — Schematic circuit diagrams representing four types of output couplings 

 Type (a) is magnetic coupling, {b), electrostatic, (c) and {d), two forms of direct coupling. 

 The unspecified network T represents the output circuit between the points where it couples 

 to the resonator sj'stem and the load. 



UNIFORM OUTPUT WAVEGUIDE . 



MAGNETRON 



RESONATOR 



SYSTEM 



TRANSFORMING 

 SECTION 



Fig. 30. — An example of a type of waveguide output circuit. It is representative of the 

 type of coupling of Fig. 29 {d). Other types of resonator systems may be used (compare 

 Fig. 26), and the transforming section, for example, may be of dumbbell-shaped cross 

 section rather than of rectangular cross section as shown. 



The type of magnetron output circuit represented schematically by Fig. 29 

 (d) is the so-called waveguide output. Here one of the resonators is broken 

 into by means of a sUt as shown in Fig. 30. Attached to this slit is a trans- 

 forming section which feeds directly into the load waveguide. The im- 



