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Fabrications and Performance of Wireless LC Pressure Sensors through LTCC Technology
Lin Lin1,2, Mingsheng Ma3, Faqiang Zhang4
1CAS Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, 1295 Dingxi Road, Shanghai 200050, China. linlin@student.sic.ac.cn.
Abstract:
This paper presents a kind of passive wireless pressure sensor comprised of a planar spiral inductor and a cavity parallel plate capacitor fabricated through low-temperature co-fired ceramic (LTCC) technology. The LTCC material with a low Young's modulus of ~65 GPa prepared by our laboratory was used to obtain high sensitivity. A three-step lamination process was applied to construct a high quality cavity structure without using any sacrificial materials. The effects of the thickness of the sensing membranes on the sensitivity and detection range of the pressure sensors were investigated. The sensor with a 148 μm sensing membrane showed the highest sensitivity of 3.76 kHz/kPa, and the sensor with a 432 μm sensing membrane presented a high detection limit of 2660 kPa. The tunable sensitivity and detection limit of the wireless pressure sensors can meet the requirements of different scenes.
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