Arc plasma fabricated phase shifter elements
It has been established that the arc plasma process can be used to fabricate ferrite phasors. The resultant ferrite-dielectric composite, except for the coercive force, has excellent microwave device characteristics. With the advent of a dielectric possessing optimum temperature coefficient of expansion, a phasor can be arc plasma sprayed which will be economical and exhibit the required device performance for phased arrays. The greatest economic impact of the arc plasma is expected to be in phasors requiring thin ferrite walls, since these are more difficult to fabricate by current processes and can be arc plasma fabricated at rapid rates. It should be noted that to achieve low cost phasors with the arc plasma technique, massive production numbers of phasors (in excess of 100,000 units) (6), are not required. That is, one can arc plasma fabricate a relatively small number of phasors and still maintain the economics of this technique.
Arc plasma sprayed C-band lithium ferrite phase shifters
The arc plasma spraying (APS) technology has demonstrated the capability of being economical in the fabrication of non-reciprocal ferrite phase shifter elements. It has been possible to arc plasma spray a C-band element in less than 10 minutes using a commercial spray dried lithium ferrite powder. This paper discusses the material properties (coercive force, remanence, and microwave loss) of the deposited lithium ferrite and the device performance (differential phase shift and insertion loss) of arc plasma fabricated phase shifter elements. The effects of stresses, generated by a mismatch of thermal coefficient of expansion between the ferrite and the dielectric are also discussed.
CHEMICAL VAPOR DEPOSITION OF EPITAXIAL YIG ON YAG AND EPITAXIAL GdIG ON YAG
Conditions are given for the epitaxial growth of YIG on YAG and GdIG on YAG. The films are identified and characterized by x‐ray, electron diffraction, electron microprobe, and magneto‐optic studies.