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Friday, June 15, 2018
Abstract-Dielectric Resonance in Ferrites for Sub-THz Signal-Processing Devices
Gopalan Srinivasan, Maksym A. Popov, Igor V. Zavislyak,
This chapter discusses dielectric resonance in type hexagonalbariumandstrontiumferrites and yttriumiron garnet (YIG) and their magnetic field-tuning characteristics. The dimensions of hexaferrites and YIG are chosen in such a way that the dielectric resonance occurs at a higher frequency than the traditionalmagnetic resonancein order to eliminate any hybrid modes. The samples in this study show dimensional resonance in the W-band (75–110GHz). In the absence of an externalmagnetic fieldH, degenerate dielectric modes corresponding to clockwise and counterclockwise polarization of themicrowavefields are observed. The mode degeneracy is lifted inH and the modes are magnetically tunable by ~ 1 GHz or more for nominal H-values. Theoretical estimates on magnetic field tuning are in reasonable agreement with the data. Possibilities for low-loss sub-THz isolators, resonators, filters, and phase shifters based on the dielectric modes are discussed.