Accession Number : ADD013387

Title :   Electromagnet for Programmable Microwave Circulator.

Descriptive Note : Patent, Filed 1 Jun 84, patented 21 Jul 87,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Milberger, Walter E ; Cohen, Joel R ; Dubrowsky, Leonard

Report Date : 21 Jul 1987

Pagination or Media Count : 12

Abstract : 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.

Descriptors :   *PATENTS, *CORES, *ELECTROMAGNETS, *FERRITES, *ATTENUATORS, *PHASE SHIFT CIRCUITS, WEIGHT, FLUX DENSITY, PERMEABILITY, SILICON, STEEL, LAMINATES, PHASE SHIFT, MAGNETIC PROPERTIES, MATERIALS, SPACERS, HIGH POWER, RADIOFREQUENCY, LIGHTWEIGHT, TRANSFORMERS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE