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+//example:-10.2,page no.-559.
+// program to design an e plane resonance isolatorin x band waveguide.
+er=13;revatt=30;
+deltaH=200;x=1700;  // x=4*%pi*Ms.
+f=10*10^9;alpha_=12.4; // from graph 10.13.
+L=revatt/alpha_; 
+alpha_1=27/L;  
+disp(L,'for total reverse attenuation of 20 db,the length of the slab in cm must be = ')
+disp(alpha_1,'for total reverse attenuation to be at least 27 db, alpha_ in db/cm be > ')
+\ No newline at end of file