1352 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1953 



part will be a positive circular polarization with respect to the applied 

 Ha and will experience a decrease in /*' and for the other direction of 

 propagation the h field will be primarily negative circularly polarized 

 and the wave will experience an increase in /x . Since the h field is linearly 

 polarized in the transverse plane at the center of the guide and is linear 

 in the longitudinal direction at the edge of the guide it is evident that 

 there is a point in between where the differential phase shift is maximum. 

 Suhl has shown that this point always occurs halfway between the guide 

 wall and the center regardless of the proximity of cut-off. 



Obviously one has merely to adjust the length of the sample and the 

 strength of the magnetic field so that the differential phase shift is 180° 

 and he will have a gyrator. Then it is an easy matter to design a cir- 

 culator, isolator, or any of the numerous devices depending upon the 

 gyrator action/^ 



EXPERIMENTAL PROCEDURES AND RESULTS 



In order to verify the theory and to determine the optimum per- 

 formance obtainable in microwave devices employing the Faraday Ro- 

 tation an extensive measurement program has been set up. Information 

 of both a fundamental and of a practical nature is obtained through a 

 variety of measurements. From a practical point of view we are interested 



fp- 



1 f ^ Ji 9 ~ I^ec<iangular waveguide containing assymetricallv located ferrite 

 slab. Magnetic lines of force are shown on the top wall of the guide. 



" C. L. Hogan^ The Ferromagnetic Faraday Effect at Microwave Frequencies 

 and Its Applications — The Microwave Gyrator, B.S.T.J., 31, pp. 1-31, Jan., 



I 



