GT'IDED-W \VK I'lt( )1'A( iATK )\ TllUOlCill ( ;YU()\I AOXKTIC Mi;i)l\ .IST 



0.8 1.2 



1.6 



Figs. 1(a) and 1(b) — The relative permealjilities m/mo and k/mo versus a. 



with respect to cr, and multiplication by ja sgn p. Of course this procedure 

 is invalid close to resonance (o- = 1), when terms in a play an important 

 part. Equations (5), which will hereafter be called the Polder equations, 

 are plotted in Fig. 1. The quantity 



K p 



ju i — po" — 0- 



is shown in Fig. 1(c). It occurs in the waveguide theory, and also in the 

 theory of other microwave circuits considered later on. The ratio m/mo = 

 /x/m-- will be denoted by vh ■ At a fixed p, Ai/juo decreases from unity at 

 0- = 0, through zero at a = — p/2 + \/pV4 + 1 to — oc at cr = 1 — 0, 

 and then from -\- ■x at a = 1+0 steadily down to unity at o- = oc . k/^io 

 increases from p at o- = to + oc at o- = 1 — 0, and then again from 

 — X at (7 = 1 + to zero at cr = x . 



It has already been mentioned that the anisotropy fields are of the 

 order of a few hundred gauss. For most ferrites the saturation magnetiza- 



