Circulators and isolators with variable operating regions

Details Circulators and isolators with variable operating regions Circulators and isolators with variable operating regions

2005-05-17

2005-05-17

Jones, Stephen E. (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Nonreciprocal gyromagnetic type

C333S024200

Reexamination Certificate

active

06894579

ABSTRACT:
A circulator (100) is comprised of a transmission line three port Y junction (104). At least one cylindrical cavity structure (113, 115) 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 dynamically changing a composition of the ferromagnetic fluid in response to a control signal to vary the permittivity and permeability of the ferromagnetic fluid.

REFERENCES:
patent: 4771252 (1988-09-01), Morz et al.
patent: 5128635 (1992-07-01), Vaughan et al.
U.S. patent application Ser. No. 10/421,050, Brown, et al., filed Apr. 23, 2003.
U.S. patent application Ser. No. 10/421,400, Brown, et al., filed Apr. 23, 2003.
Wolfgang Borschel, “Circulators and Ring Hybrids”, VHF Communications, Mar. 2000, pp. 179-185.

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