1392 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1956 



mixer of Fig. 7 at a wavelength of 5.4 millimeters. In order that the 

 measurements might be more readily compared with those made on 

 commercially available rectifiers used at longer wavelengths, the avail- 

 able beating oscillator power was maintained at a level of one milliwatt 

 for all measurements.* Further, in the case of the conversion loss, a 



35 



30 



25 

 20 



15 

 10 



6.2 



6.6 7.0 7.4 7.8 8.2 



CONVERSION LOSS IN DECIBELS 



8.6 



Fig. 8 — Conversion loss (L) of 100 wafer units at a wavelength of 5.4 railli- 

 meters with one-milliwatt beating oscillator drive (average 7.2 db). 



50 

 45 

 40 

 35 



(f) 



Z 30 



D 



"25 



LU 



2 20 



Z 

 15 



to 



1.2 1.6 2.0 2.4 2.8 3.2 



NOISE RATIO Nr times 



3.6 



4.0 



Fig. 9 — Noise Ratio (jVr) for 100 wafer units at a wavelength of 5.4 milli- 

 meters with a one-milliwatt beating oscillator drive (average 2.21 times). 



* Power levels were determined by the use of a calorimeter. See, A Calorimeter 

 for Power Measurements at Millimeter Wavelengths, I. R. E. Trans., MTT-2, 

 pp. 45-47, Sept., 1954. 



