Circulators and isolators with variable ferromagnetic fluid...

Details Circulators and isolators with variable ferromagnetic fluid... Circulators and isolators with variable ferromagnetic fluid...

2005-02-08

2005-02-08

Jones, Stephen E. (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Nonreciprocal gyromagnetic type

C333S024200

Reexamination Certificate

active

06853263

ABSTRACT:
A circulator (100) is comprised of a transmission line three port Y junction (104). At least one substantially cylindrical cavity structure (113, 115or117) having a plurality of chambers is disposed adjacent to the Y junction and contains a ferromagnetic fluid (114). One or more magnets (112) are provided for applying a magnetic field (118) to the ferromagnetic fluid and the Y junction in a direction normal to a plane defined by said Y junction. A composition processor (301) is provided for changing a volume of ferromagnetic fluid in at least one among the plurality of chambers in response to a control signal to selectively alter the operating regions of the circulator.

REFERENCES:
patent: 4771252 (1988-09-01), Morz et al.
patent: 4794352 (1988-12-01), Morz et al.
Wolfgang Borschel, “Circulators and Ring Hybrids”, VHF Communications, Mar. 2000, pp. 179-185.
U.S. Appl. No. 10/330,761, filed Dec. 27, 2002, Brown et al.
U.S. Appl. No. 10/421,050, filed Apr. 23, 2003, Brown et al.

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