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Scattering parameters measurement of a nonreciprocal coupling structure

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2 Author(s)
P. Kwan ; Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA ; C. Vittoria

A novel ferrite image guide was designed and tested from 26.5 to 40 GHz. The nonreciprocal structure consisted of two dielectric image guides separated by a ferrite slab. M-type hexagonal ferrite was used with its C-axis oriented parallel and perpendicular to the direction of propagation. The S-parameters of the device were measured for a nonuniform external biasing magnetic field applied parallel to the C-axis of the ferrite slab. Nonreciprocal effects were observed for all cases considered above. The results imply applications for ferrite devices operating at millimeter wavelength frequencies, such as isolators, filters, modulators, switches, phase shifters, etc

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:41 ,  Issue: 4 )