Fixed frequency filters using epitaxial ferrite films

Details Fixed frequency filters using epitaxial ferrite films Fixed frequency filters using epitaxial ferrite films

1978-01-17

1980-02-12

Gensler, Paul L.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 96, 332 51W, 333211, 333 81B, H03C 300, H03C 100, H01P 120, H01P 122

Patent

active

041885945

ABSTRACT:
Films of epitaxially deposited hexagonal ferrite material backed with metal and inserted into waveguides in single and multiple stages are used to form band-pass and band-stop filters, variable attenuators and modulators. The films have body resonance modes with resonant frequencies which are essentially fixed as an externally applied magnetic field is varied. Thin films of hexagonal ferrite material have resonant frequencies in the high microwave and millimeter wavelength frequency ranges. Since hexagonal ferrites have a high magnetic anisotropy and accompanying high internal magnetic field, little or no external magnetic bias may be required once the film is magnetized.

REFERENCES:
patent: 2948870 (1960-08-01), Clogston
patent: 3100288 (1963-08-01), Schloemann
Soohoo, Theory and Application of Ferrites, Prentice-Hall, N.J., 1960, p. 256.
Lax et al., Microwave Ferrites and Ferrimagnetics, McGraw-Hill, N.Y., 1962, pp. 311, 312.

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