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Sensors 2016, 16(2), 150;

Multi-Channel Capacitive Sensor Arrays

Mitsubishi Electric Research Laboratories, 201 Broadway, Cambridge, MA 02139, USA
University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA
Author to whom correspondence should be addressed.
Academic Editor: Roland Moser
Received: 18 November 2015 / Revised: 30 December 2015 / Accepted: 18 January 2016 / Published: 25 January 2016
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [3504 KB, uploaded 25 January 2016]   |  


In this paper, multi-channel capacitive sensor arrays based on microstrip band-stop filters are studied. The sensor arrays can be used to detect the proximity of objects at different positions and directions. Each capacitive sensing structure in the array is connected to an inductive element to form resonance at different frequencies. The resonances are designed to be isolated in the frequency spectrum, such that the change in one channel does not affect resonances at other channels. The inductive element associated with each capacitive sensor can be surface-mounted inductors, integrated microstrip inductors or metamaterial-inspired structures. We show that by using metamaterial split-ring structures coupled to a microstrip line, the quality factor of each resonance can be greatly improved compared to conventional surface-mounted or microstrip meander inductors. With such a microstrip-coupled split-ring design, more sensing elements can be integrated in the same frequency spectrum, and the sensitivity can be greatly improved. View Full-Text
Keywords: capacitive sensor; sensor array; metamaterials; split-ring-resonator capacitive sensor; sensor array; metamaterials; split-ring-resonator

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Wang, B.; Long, J.; Teo, K.H. Multi-Channel Capacitive Sensor Arrays. Sensors 2016, 16, 150.

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