DEVELOPMENT OF BROAD-BAND ELECTROMAGNETIC ABSORBERS FOR ELECTRO-EXPLOSIVE DEVICES.
Final rept., July 62-Oct 63,
FRANKLIN INST PHILADELPHIA PA LABS FOR RESEARCH AND DEVELOPMENT
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A representative number of ferrites are evaluated and attenuation values at frequencies of 500 kc to 500 Mc are given in table form. An equation expresses attenuation as a function of frequency, complex permeability, complex permittivity, and loss tangents. An increase in conductivity of the dielectric material can increase attenuation. A series of graphs is presented which show the conductivity of the theoretical models which were postulated. The effect of silvering the outside and inside diameters of toroids is discussed, and the changes in parameters as a result of silvering are plotted. Silvering cannot change the bulk parameters of the material but it does change the surface conductivity. Methods of measuring volume-resistivity and of choosing the coating technique for silvering ferrites are given. Author