TUNABLE-INDUCTANCE MAGNETICALLY-SOFT FERRITE CORE STRUCTURES AND METHODS OF MANUFACTURE

摘要

New ferrite tuning assemblies in which a unitary ferrite shaft (10, 22) is covered with a nonmagnetic material (18, 26) to provide a peripheral working surface for coacting with unitary helical thread means (76) in the central opening of a core element (32, 34) to provide axial movement, for air gap (52) adjustment purposes, by cutting and/or deforming at least a portion of the peripheral working surface of the tuning member. Various longitudinal and transverse cross-sectional configurations for the integral male tuning member are made available by the fabrication and assembly methods taught; assembly of inductance-tunable ferrite devices is facilitated by enabling insertion of a male tuning member into the central opening of either core element in an assembly and tuning from either longitudinal end of the aligned central openings.