Microwave Single-Sideband Modulator Using Ferrites

Two laboratory models of a single-sideband modulator are described. The frequency of a microwave signal is shifted by means of a rotating magnetic field transverse to a ferrite differential half-wave section. The first laboratory model, a transmission device, is inserted in a waveguide-transmission line. The second model, which is a reflection device, reflects signals from a source. Either modulator shifts the microwave-carrier frequency of 9,375 mc by plus or minus 20 kc. Differential half-wave sections are shown to be possible from Polder´s explanation of double refraction of plane electromagnetic waves propagated in an infinitely large ferromagnetic medium magnetized transverse to the direction of propagation.