Apparatus for characterizing millimeter-wave propagation through magnetoelastic multiferroic materials

This paper presents a unique apparatus for measuring the Faraday rotation imparted on millimeter waves as they propagate through magnetoelastic multiferroic materials. The instrument is designed to operate in the V-band, specifically over the frequency range of 57 GHz to 67 GHz. The instrument focuses a Gaussian beam with a spot size of approximately 12 mm onto a customized material sample holder. A V-Band dual mode polarized horn antenna with horizontal and vertical ports and an intergrated orthomode transducer is used to detect the power from the material under test (MUT) using a lock-in amplifier. Experiments were performed with and without MUT to determine the change in polarization of the millimeter wave in each case.