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. 2017 May 4;17(5):1029. doi: 10.3390/s17051029

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© 2017 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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The average transmission loss of the HR array consist of two periodic parts (n = 3, m = 7) with different connection tube length L_d (solid lines represent the theoretical predictions, and dashed lines represent the FEM simulation results): (a) $L_{d} = 3 \times 0.5 λ_{0}$ ; (b) $L_{d} = 3.3 \times 0.5 λ_{0}$ ; (c) $L_{d} = 10 \times 0.5 λ_{0}$ .