Temperature-compensated waveguide isolator
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United States of America Patent
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Feb 8, 1994
Grant Date -
N/A
app pub date -
Dec 23, 1992
filing date -
Dec 23, 1992
priority date (Note) -
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Abstract
A temperature-compensated junction isolator (28) is used with a waveguide junction (20) in a hollow microwave waveguide system (22). The junction isolator (28) includes a ferrite cylinder (34) within the waveguide walls (30 and 32) at the junction with its cylinder axis (36) perpendicular to the waveguide walls (30 and 32). A pair of temperature-compensation washers (38) are aligned with the cylinder axis (36) of the ferrite cylinder (34) and are positioned external to the waveguide walls (30 and 32). Each washer (38) has a central opening (40) smaller in diameter than the diameter of the ferrite cylinder (34) and is made of a material whose permeability decreases with increasing temperature, preferably a nickel-iron alloy with about 30 percent iron. A pair of magnets (42) are aligned with the cylinder axis (36) of the ferrite cylinder (34), one of the magnets (42) being located exterior to each of the temperature-compensation washers (38 ). The waveguide junction isolator (28) produces a circulator function with relatively uniform properties over a range of operating temperatures.
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