FREQUENCY DOUBLING USING FERRITE SLABS, PARTICULARLY PLANAR FERRITES,
Abstract
An analysis is given of results of frequency-doubling experiments using relatively thick megacycles. Dielectric properties of the ferrite caused the double frequency wave to behave as a surface wave. This tends to concentrate the double frequency fields in the vicinity of the ferrite, thus increasing its interaction with the oscillating magnetic dipole moments that generate these fields and increasing the conversion efficiency. The surface-wve effect also causes a phase difference between the magnetic dipole moments and the double frequency fields; this limits the efficiency obtainable through this effect. Spin-wave effects can contribute to harmonic generation if the precession orbits of their magnetization vectors are highly elliptical. The best conversion efficiency obtained power level of 6300 watts. Planar ferrites have inherent advantages over isotropic ferrites because the planar anisotropy greatly increases the ellipticity of the precession of the magnetization vectors of both the uniform mode and the spin waves. The relatively large dielectric constant of planar ferrites is also helpful to frequency doubling. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1961
- Accession Number
- AD0268983
Entities
People
- Isidore Bady
Organizations
- United States Army Communications-Electronics Command