Electromagnet for Programmable Microwave Circulator.
Patent, Filed 1 Jun 84, patented 21 Jul 87,
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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A Spacercore design is used to provide the cores of the electromagnets which are used to bias ferrite slabs in phase shifters of a high power RF attenuator. The phase shifters require a given flux to provide a phase shift from zero to 90 deg. With laminations of high permeability silicon steel, the core weight may be substantially reduced by including a filler comprising spacers of nonmagnetic material such as lightweight transformer pressboard. With 14-mil silicon steel laminations and 64-mil spacers, this construction provides a core which weighs 25 percent of a full ferrite core for the same flux density.
- Electrical and Electronic Equipment