. The Bell System technical journal . e coating, is very nearly con-stant (within a few mils) for the stated range of 8 and for this type of [design.* i In Section IV a theoretical calculation using the null condition at i 6175 mc/sec for a full height ferrite gives 5 = 180 mils b = mils so that 8 -f b/2 = mils. In the theoretical case t is assumed to bevery small. It will be noted that the theoretical result for 8 + b/2 (withsmall t) agrees quite well with the experimental 5 -f 6/2 — 2t. The ques-tion of the possible phj^sical significance of this quantity is beinginvestigated. D.
. The Bell System technical journal . e coating, is very nearly con-stant (within a few mils) for the stated range of 8 and for this type of [design.* i In Section IV a theoretical calculation using the null condition at i 6175 mc/sec for a full height ferrite gives 5 = 180 mils b = mils so that 8 -f b/2 = mils. In the theoretical case t is assumed to bevery small. It will be noted that the theoretical result for 8 + b/2 (withsmall t) agrees quite well with the experimental 5 -f 6/2 — 2t. The ques-tion of the possible phj^sical significance of this quantity is beinginvestigated. D. Placement of Resistance Material and Choice of ResistivityThe propagating mode with a full height ferrite slab is of a TEovariety, the zero subscript indicating that no variation occurs with re- * In one design of the isolator we used a General Ceramics magnesium manga-nese ferrite with 5 = , b = and t = so that 8 + b/2 - 2t = 199mils, in good agreement with Table I. 888 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1956. Fig. 9 — Distribution of jsmall tangential electric fields at interior ferrite faceJ
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