SOUND WAVE AND MICROWAVE SPACE PATTERNS 



583 



Fig. 27 — When the waveguide feed of the lens of Fig. 26 is brought closer to the lens, a 

 beam of flat wavefronts is produced./ = 9,1 KMC. 



723 A-B 

 KLYSTRON 



LENS FEED 

 HORN 



REFERENCE 

 FEED HORN 



WAVEGUIDE 

 TYPE LENS 



Fig. 28 — The method of adding a constant-phase constant-amplitude microwave signal 

 to the lens signals of Figs. 26 and 2? so as to portray the wave fronts. 



