Characteristics of Cavity Resonators Made of Fused Quartz
NAVAL RESEARCH LAB WASHINGTON DC
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Previous investigations have shown that the frequency dispersions of cavity resonators are caused by the expansitivity anomalies common to all metals. In an investigation of nonmetallic materials it was found that fused quartz also has an anomaly but that the magnitude of this anomaly is several orders smaller than the anomalies of metals. On this basis it is predicted that resonators made of fused quartz will be improved approximately 280 times over the equivalent metal cavity resonators. It is shown that resonant cavities can be designed employing fused quartz as dielectric or as mechanical boundary. The fused quartz dielectric cavity resonators are approximately half the size of the equivalent air dielectric cavity resonators and are easier to fabricate but have a lower Q.
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