WAFER TYPE MILLIMETER WAVE RECTIFIERS 



1395 



14. Or 



-I 13.5 



o 



HI 13.0 



Q 



12.5 



d: 

 2 12.0 



LU 



5 11.5 



11.0 



ai 

 to 



O 10.5 



cc 

 ^10.0 



LU 



o 



^ 9.5 



Q 



< 9.0 



ID 

 I/) 



O 8.5 



_i 



2 



O 8.0 



CO 



cc 



HI 



> 7.5 

 z 

 o 

 u 



7.0 



6.5 



note: 



this curve was calculated using 

 an assumed value of 5.5db for the 

 noise figure of the if amplifier "^^ 



3.5 



(0 

 -3.0 



(/) 

 h ^2.5 



2.0 



O '-^ 



t- 

 < 

 °^ 1.0 



LU 



If) 



O 0.5 



380 

 360 

 340 

 320 

 300 

 280 

 260 

 240 



>- 

 O 



111 o 

 cr I 



U- (J 



I- 9 



< <o 

 5 



LU 



LU 

 :^ Q. 



N 



0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 

 RECTIFIED CURRENT IN MILLIAMPERES 



Fig. 11 — Typical performance curves for wafer-type rectifiers. 



was designed to operate over the 4- to 7-millimeter band and is pic- 

 tured in Fig. 12. A compact arrangement has been achieved which 

 makes use of a waveguide finline-to-coaxial input circuit for the beating 

 oscillator while the signal is introduced through a separate impedance- 

 matched waveguide "Tee" section. Return loss measurements show that 

 with a matched pair of Avafer units, fixed-tuned in the center of the 5- to 

 6-millimeter band, an excess loss of about 1 db may be expected at the 

 edges of a 15 per cent band. At midband, an improvement of 5 db in 

 over-all receiver noise figure was obtained by substituting the balanced 

 converter for an unbalanced one in a test receiver using an M1805 milli- 



