33.Magnetics by John G. Webster (Editor)

By John G. Webster (Editor)

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A detailed review of domain structures in grain-oriented silicon-iron is given in reference (6). A typical domain pattern observed on a surface of grainoriented silicon-iron sheet is shown in Fig. 4. The wide dark and light areas are domains whose magnetizations are opposite to each other and separated by 180◦ walls. The effect of a grain boundary and slightly misoriented grains is also seen but the main volume of the steel is made up of bar domains running almost parallel to the rolling direction of the sheet.

Originally intended to be operated at higher frequencies, this absorber restricted the use of these chambers to approximately the 90 MHz to 1000 MHz frequency range (4). With the promulgation of emission requirements during the late 1970s, absorber manufacturers were confronted with a growing demand for a compact wideband absorber to operate over the entire 30 to 1000 MHz frequency range. The evolution of compact wideband absorbers was catalyzed in the mid 1980s when techniques to calculate and measure its reflectivity were developed.

In practice laminations are often partly magnetized under nonsinusoidal flux conditions. It is convenient in such cases to determine the loss experimentally from: P= 1 T T hs 0 db dt dt (6) where T is the magnetization period, hs is the instantaneous tangential component of the field at the steel surface, and db/dt is the corresponding instantaneous value of the rate of change of the average spatial flux density within the material. These terms are experimentally obtainable using a variety of standard techniques.

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