To develop millimeter-wave modulators, high-anisotropy uniaxial monocrystalline hexagonal ferrite resonators (HFRs) can be used. One of the ways to modulate the hexagonal ferrite resonator's resonance frequency is to periodically vary the angle between the equilibrium magnetic moment and the external magnetization field. This angular control can be exercised by the mechanical (acoustic) oscillations excited in a piezoelectric slab having a good acoustic contact with the HFR. We consider a quasi-static mathematical model of the uniaxial HFR with the angular control of its resonance frequency. We analyze the amplitudes of harmonics of the modulated millimeter-wave signal, and we derive the optimal orientation of the ferrite crystallographic axis. We suggest some ideas regarding the design of a modulator on the basis of an HFR and a piezoelectric slab, and we present experimental results.
M. Koledintseva and A. A. Kitaytsev, "Modulation of Millimeter Waves by Acoustically Controlled Hexagonal Ferrite Resonator," IEEE Transactions on Magnetics, Institute of Electrical and Electronics Engineers (IEEE), Jan 2005.
The definitive version is available at http://dx.doi.org/10.1109/TMAG.2005.852951
Electrical and Computer Engineering
Keywords and Phrases
Angular Control of the Resonance Frequency; Crystallographic Anisotropy; Modulation of Millimeter Waves; Piezoelectric Slab; Uniaxial Monocrystalline Hexagonal Ferrite Resonator
International Standard Serial Number (ISSN)
Article - Journal
© 2005 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.