Theory and operation of a cross-field magnetic modulator

The theory of operation and practical limitations of a toroidal cross-field magnetic modulator are discussed. Approximate relationships are derived for the amplitude of the fundamental component of output voltage, conversion power gain, and output impedance. Experiments on devices of this kind using two types of ferrite core material are described. The agreement between experimental results and analytical calculations is satisfactory enough to warrant the use of the derived relations in design procedures. Among other things, it has been shown that the conversion power gain is directly proportional to excitation frequency and the number of turns on the input winding, and is independent of the number of turns on the output winding.