Abstract

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 10⁷/°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 10⁸/°C from 20°C to 80°C. The method of fabrication is presented as well as a detailed analysis of the known factors affecting resonator stability.

© 1968 Optical Society of America

Microwave Luneburg Lens

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