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1. (WO2017155604) SHAPED MAGNETIC BIAS CIRCULATOR

Pub. No.:    WO/2017/155604    International Application No.:    PCT/US2017/013263
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Jan 13 00:59:59 CET 2017
IPC: H01P 1/383
Applicants: RAYTHEON COMPANY
Inventors: RAJENDRAN, Sankerlingam
CARR, James, A.
KYHL, Cary, C.
WORTHEN, Karl, L.
Title: SHAPED MAGNETIC BIAS CIRCULATOR
Abstract:
A circulator is provided, comprising, first second and third conductors forming three equally spaced junctions and a permanent magnet configured to apply a shaped bias magnetic field to a ferrite resonator in operable communication with the first, second, and third conductors. The permanent magnet comprises a substantially planar monolithic structure having defined thereon at least first and second substantially concentric regions having first and second respective magnetic field strength levels, wherein the second magnetic field strength level is lower than the first magnetic field strength level. The first and second magnetic field strength levels are configured to cooperate to shape an external bias magnetic field of the permanent magnet to counteract at least a portion of a demagnetizing effect resulting from of an overall shape of the ferrite resonator, to achieve a substantially uniform internal magnetic bias within at least a portion of the ferrite resonator.