A highly temperature-stable microwave resonator.
The usefulness of a temperature-stable microwave resonator is well known. The most common approach in the past to the fabrication of such a device has been to use a relatively low expansion material, such as invar, in combination with higher expansion materials for compensation. Stabilities on the order of 5 parts in 10(7)/ degrees C have been achieved by this method; however, the compensation frequently degrades with age This article describes a cavity constructed from a glass-ceramic substrate without compensation and having a stability of 1.25 parts in 10(8)/ degrees C from 20 degrees C to 80 degrees C. The method of fabrication is presented as well as a detailed analysis of the known factors affecting resonator stability.
Gunderson
L C
LC
Smith
D M
DM