WAVEGUIDE TESTING WITH MILLIMICKOSECOND PULSES 65 



24 to 27 db below the injected TEoi pulse level for the 5" diameter 

 Holmdel waveguides. 



12. CONCLUDING REMARKS 



The high resolution obtainable with this millimicrosecond pulse 

 equipment provides information difficult to obtain by any other means. 

 These examples of its use in waveguide investigations indicate the 

 possibilities of the method in research, design and testing procedures. 

 It is being used for many other similar purposes in addition to the illus- 

 tratio)is given here, and no doubt many more uses will be found for 

 such short pulses in the future. 



REFERENCES 



1. S. E. Miller and A. C. Beck, Low-loss Waveguide Transmission, Proc. I.R.E., 



41, pp. 348-358, March, 1953. 



2. S. E. Miller, Waveguide As a Communication Medium, B. S. T. J., 33, pp. 1209- 



1265, Nov., 1954. 



3. C. C. Cutler, The Regenerative Pulse Generator, Proc. I.R.E., 43, pp. 140- 



148, Feb., 1955. 



4. S. E. Miller, Coupled WaveTheory and Waveguide Applications, B. S. T. J., 33, 



pp. 661-719, May, 1954. 



