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In this paper, a portable low-cost system for the accurate measurement of complex resonance frequencies up to 19 GHz for whispering gallery mode thermometry is presented and validated. The instrument performs vectorial transmission measurements for the determination of resonance frequencies with accuracy in the order of a few parts in in$10^{9}$ over two different RF/microwave bands: 1) 800 MHz–7...
The main current limit to the application of Sapphire Whispering Gallery Thermometry (SWGT) as transfer temperature standard in industry is represented by the cost and bulkiness of the Vector Network Analyzer (VNA) required to investigate the resonances of interest. In this work we present a low-cost measurement system for the accurate detection of complex resonance frequencies up to 19 GHz, aimed...
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