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Patent

Microwave mode suppressors

13 Mar 1956-
About: The article was published on 1956-03-13. It has received 4 citations till now.
Citations
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Patent
17 Jan 1978
TL;DR: In this paper, 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.
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.

11 citations

Patent
23 Feb 1960
TL;DR: In this article, a waveguide mode filter for suppressing high-order modes is proposed, which consists of a thin layer of magnetically lossy material supported in a region of the waveguide where the magnetic field component of a desired low-order mode is negligible and that of an undesired higher order mode is close to its maximum intensity.
Abstract: 867,496. Waveguide mode suppressors. STANDARD TELEPHONES & CABLES Ltd. Feb. 26, 1960 [March 3, 1959], No. 7317/59. Class 40(8) A waveguide mode-filter for suppressing undesired high-order modes comprises a thin layer of magnetically lossy material supported in a region of the waveguide where the magnetic field component of a desired low-order mode is negligible and that of an undesired higher-order mode is close to its maximum intensity. As shown, a lossy magnetic cylinder 2 of radius 0A628R is supported by foamed polystyrene members 3, 4 within a circular waveguide 1 of radius R intended for propagation of the H 01 mode. The longitudinal field of the H 02 mode approaches its maximum intensity in the region of the magnetic cylinder and fields due to the H 03 and other modes of higher order have non- zero intensities in the same region. The cylinder 2 may be a solid piece of nickel-zinc ferrite or may be formed by winding magnetic recording tape around the inner support 4. Alternatively, it may be formed by painting the surface of either of the supports 3. 4 with a slurry containing powdered ferrite. The layer may be permanently magnetized or biased by an external field.

1 citations

References
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Patent
03 Apr 1953

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Patent
23 May 1950

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Patent
10 Jun 1953

26 citations