Broad-band non-reciprocal microwave devices

Details Broad-band non-reciprocal microwave devices Broad-band non-reciprocal microwave devices

1987-05-29

1988-12-06

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Nonreciprocal gyromagnetic type

333 241, H01P 1387

Patent

active

047898445

ABSTRACT:
A stripline circulator includes a pair of dielectrically supported ferrite discs and a pair of spaced hemispherical ferrite caps each one disposed over a corresponding one of the ferrite discs. The ferrite caps provide in combination with the ferrite discs a uniform DC magnetic field within the ferrite discs to reduce the insertion loss of the circulator at frequencies less than the so-called magnetization frequency of the ferrite material and thus, extend the operating bandwidth of the circulator. The ferrite caps are spaced from the ferrite discs by a thin layer of metallization having a thickness larger than the skin depth thickness of a microwave signal over the desired microwave frequency band. The ferrite discs are preferably comprised of signal crystalline ferrite materials oriented in a hard-axis orientation which generally is the [100] direction for materials where the first order anisotropic constant K.sub.1 is negative.

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