THE FIELD DISPLACEMENT ISOLATOR 



893 



5900 6000 6t00 6200 6300 6400 

 FREQUENCY IN MEGACYCLES PER SECOND 



6500 



Fig. 17 — Ideal isolation characteristics. 



main constant.. On the other hand as the transverse air wave number 

 decreases through real vahies, the electric field adjacent to the ferrite 

 becomes relatively large. At X = X^ the distribution is linear with rela- 

 ]\ tively large dissipation at the ferrite face. As the transverse air wave 

 number increases through imaginary values the distribution becomes 

 exponential such that the field adjacent to the ferrite is always the maxi- 

 mum for the air region and the growth of the field at the face of the 

 ferrite would not seem to be so great as formerly. One would therefore 

 expect a maximum reverse loss somewhere in the region X = Xy . 



The abo^^e considerations plus the transcendental equation for the 

 null show consistency with the experimental design values which were: 



8 = 0.180" 

 L = 1.59 

 47rilf s = 1 ,700 gauss 



Using Hue = 000 oersteds in the calculation we obtain the spacing from 

 the guide wall h = 0.0387". The fact that we used 600 oersteds for the 

 full height slab calculation as opposed to the internal field of 300 oersteds 

 found experimentally for the partial height slab should not be a source of 

 confusion. It has been indicated earlier that the peak reverse loss shifts 



