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. 2019 Sep 8;19(18):3876. doi: 10.3390/s19183876

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Comparison of amplitude vs. frequency results with vector network analyzer (VNA) measurement: (a,b) Sensing path and (c,d) removal path; left for portable prototype and right for VNA. The series 1–3 are triplicate measurement results of the orthogonal SAW device.

Comparison of amplitude vs. frequency results with vector network analyzer (VNA) measurement: (a,b) Sensing path and (c,d) removal path; left for portable prototype and right for VNA. The series 1–3 are triplicate measurement results of the orthogonal SAW device.