METHOD FOR FORMING A DRIVE HOLE IN ARC PLASMA SPRAY FABRICATED FERRITE PHASORS

摘要

ABSTRACT OF THE DISCLOSUREA method for forming a drive wire hole in a ferrite toroidphase shifter adapted to operate in the millimeter frequency range. Theferrite toroid is fabricated by the arc plasma spray process. A slab ofboron nitride is initially bonded to the dielectric insert of the ferritetoroid and the ferrite powder is arc plasma sprayed on the compositeboron nitride-dielectric structure. The formed ferrite toroid is thenannealed, and during the annealing process, the boron nitride slab iscompletely sublimated to form the required drive wire hole.