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The reflectivity of the ferrite grid strongly depends on the filling factor g. One of the advantages of this ferrite grid geometry over the standard solid tile is that there is an additional parameter, the filling factor g, that can be varied to place the nulls (or minimum) of the reflectivity at a desired frequency. The ferrite grid can be designed for wider frequency band performance over that of the standard solid tiles by appropriately choosing the tile thickness, filling factor g, and the material properties of the ferrite.

By a suitable combination of cold rolling and heat treatment a large proportion of grains having {001} directions close to the rolling direction of silicon-iron strip can be formed (4). Figure 2 shows a schematic representation of grains in grainoriented silicon-iron sheet. Typical permeability and loss characteristics are shown in Fig. 3. Grain-oriented siliconiron is often referred to as [001](110) oriented silicon steel or Goss textured silicon steel (named after the inventor J. ), Wiley Encyclopedia of Electrical and Electronics Engineering.

Figure 14. 6 T, 50 Hz) (19). magnetizing current in the center limb coil (not shown) is zero (the three inner wider limbs carry the coils A, B, and C). Flux penetration into the center limb will be noted (18). Figure 12(b) shows the corresponding direction of the localized 3rd harmonic flux density. Flux in adjacent laminations will be in opposite directions so the total limb flux does not appear to contain any harmonic components. The T-joint design plays an important role in determining the localized and total core loss of a 3-phase transformer.

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