Patent ID: 6087971
Filing Date: 2000-07-11
Classification: H01Q

Abstract:
A method of fabricating a ceramic window for a radio-frequency device, comprising the steps of:providing a dense, sintered Si.sub.3 N.sub.4 ceramic having a glassy phase;providing SiO.sub.2 on the surface of said Si.sub.3 N.sub.4 ceramic;heating said Si.sub.3 N.sub.4 ceramic and said SiO.sub.2 at a temperature sufficient to cause diffusion of impurity and additive cations from said glassy phase into said SiO.sub.2 ;removing said SiO.sub.2 and the underlying surface of said Si.sub.3 N.sub.4 ceramic to a depth sufficient to remove surface pits; andshaping said Si.sub.3 N.sub.4 ceramic into a window for a radio-frequency device.