.~ Nonreciprocal gyromagnetic type (e.g., circulators)
DEFINITION
Classification: 333/1.1
(under subclass 1) Systems which include gyromagnetic elements for effecting a nonreciprocal interchange of electrical energy among the transmission lines or through the coupling network.
(1) Note. The term "gyromagnetic" as applied to material designates magnetically polarized material (e.g., ferrites, garnets, ionized gases) having unpaired spin systems which exhibit significant precessional motion in an orthogonal R.F. field. The term "nonreciprocal" designates a particular interchange of electrical energy that does not satisfy the reciprocity theorem. For example, a nonreciprocal interchange exists when the electrical output at a first set of terminals of a network produced by an input at a second set of terminals of the network does not equal the output at the second set of terminals produced by the same input applied at the first set of terminals. The term "circulator" (to which most of the patents in this subclass pertain) designates a device with at least three terminals wherein power entering at terminal 1 exists at terminal 2 only, power entering at terminal 2 exists at terminal 3 only, and power entering at terminal 3 exists at terminal 1 only.
SEE OR SEARCH THIS CLASS, SUBCLASS:
24.1, 24.2 and 24.3, for single channel coupling networks including gyromagnetic material for effecting a nonreciprocal transfer of electrical energy.
SEE OR SEARCH CLASS
330, Amplifiers, 4, 4.8 and 63 for amplifiers using gyromagnetic elements.
