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A dual-material strategy for enhancing the temperature robustness of microwave resonant cavity

Published online by Cambridge University Press:  13 December 2022

Dongxu Fu Open the ORCID record for Dongxu Fu [Opens in a new window] ,
Xia Xiao Open the ORCID record for Xia Xiao [Opens in a new window]  and
Linshuo Gu Open the ORCID record for Linshuo Gu [Opens in a new window]
Dongxu Fu
Affiliation:
Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, School of Microelectronics, Tianjin University, Tianjin 300072, China
Xia Xiao*
Affiliation:
Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, School of Microelectronics, Tianjin University, Tianjin 300072, China
Linshuo Gu
Affiliation:
Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, School of Microelectronics, Tianjin University, Tianjin 300072, China
*
Author for correspondence: Xia Xiao, E-mail: xiaxiao@tju.edu.cn
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Abstract

Resonant frequency varies significantly due to temperature changes for microwave resonant cavities. Hence, temperature robustness enhancement is of great importance. In this paper, a resonant cavity with enhanced temperature robustness is proposed by applying the dual-material strategy to the middle cavity. Compared to the single-material cavity, the dual-material cavity can demonstrate better temperature robustness with a decrease of 72.7% in the frequency shift over the temperature range of −20 to 80°C. Moreover, the |S11| < −10 dB impedance bandwidth is 6.3% (3.39–3.61 GHz) and the gain is 20.4 dBi at 3.5 GHz for the manufactured dual-material cavity, which are much better than those of the manufactured single-material cavity. Finally, an experiment is conducted to measure the resonant frequencies with the sample solution tube of the dual-material cavity filled with nothing or 30 mg/dl CuSO4 solution, the measured values are consistent with the simulated ones. The influence of temperature drift is significantly reduced, and the feasibility of the dual-material strategy is verified.

Keywords

Microwave resonant cavityresonant frequencytemperature robustness enhancementdual-material strategytemperature drift
Type
Microwave Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 7 , September 2023 , pp. 1139 - 1146
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Copyright
© The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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