Journal
SENSORS
Volume 18, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/s18020340
Keywords
wireless pressure sensor; LTCC; LC resonator; cavity
Funding
- National Key Research and Development Program of China [2017YFB0406303]
- National Natural Science Foundation of China (NSFC) [61501438]
- Youth Innovation Promotion Association of CAS
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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 similar to 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 mu m sensing membrane showed the highest sensitivity of 3.76 kHz/kPa, and the sensor with a 432 mu m 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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