Passive wireless LC proximity sensor based on LTCC technology

Research output: Contribution to journalArticlepeer-review


  • Mingsheng Ma
  • Feng Liu
  • Faqiang Zhang
  • Zhifu Liu
  • Yongxiang Li

Colleges, School and Institutes

External organisations

  • Chinese Academy of Sciences
  • RMIT University


In this work, we report a passive wireless eddy current proximity sensor based on inductive-capacitive (LC) resonance using a low temperature co-fired ceramic (LTCC) technology. The operation principle of the LC proximity sensor to the metal targets was comprehensively discussed through electromagnetic simulation and circuit model. Copper and aluminum were selected as the metal target materials for the measurements. Circular copper plates with different diameters and thickness were used to investigate the influence of the surface area and thickness of the target on the sensitivity. The decreases of the sensitivity with the decrease of the surface area and thickness were observed. The LC proximity sensor showed a high sensitivity of 11.2 MHz/mm for the proximity distance of 1–3 mm, and large detection range up to 10 mm. The developed LC proximity sensor is promising for passive wireless metal detections and proximity measurements under harsh environments.


Original languageEnglish
Article number1110
JournalSensors (Switzerland)
Issue number5
Publication statusPublished - 5 Mar 2019


  • Eddy current, LC resonance, LTCC technology, Proximity sensor