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Experimental characterization of hexaferrite ceramics from 100 GHz to 1 THz using vector network analysis and terahertz-time domain spectroscopy

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4 Author(s)
Yang, Bin ; School of Electronic Engineering and Computer Science, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom ; Wang, Xinke ; Zhang, Yan ; Donnan, Robert S.

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Gyrotropic, magnetically-hard hexaferrite ceramics, are a very promising material for deployment as quasioptical nonreciprocal devices at high frequencies (≫90 GHz). In this paper, a quasioptical measurement bench driven by a vector-network analyzer and a terahertz (THz) time domain spectroscopy measurement system are used in conjunction to characterize a thin (2.02 mm thickness) hexaferrite plate for two orthogonal states of beam polarization. From these data, the intrinsic circular-polarization transmittance for each state (or case), of polarization, left and right, is computed. Inherent magneto-optical constants of the plate over the range of 100 GHz to 1 THz are then determined. Analysis reveals low attenuation of the hexaferrite ceramics over millimeter and submillimeter wave bands.

Published in:

Journal of Applied Physics  (Volume:109 ,  Issue: 3 )

Date of Publication:

Feb 2011

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