This letter proposes a wearable antenna fabricated by multifilament threads. The radiator is conductive threads filled with a copper wire, directly sewn onto a piece of cloth. Its advantages include better impedance matching, enhanced radiation efficiency, and additional value to smart clothing because the radiator is shaped into a logotype. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1232–1236, 2016

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A general solution to the antiplane problem of two concentric circular-arc inclusions in bonded dissimilar materials is provided. Based upon the Hilbert problem formulation and the technique of analytical continuation, the expressions of the complex potentials are derived explicitly in both the unit disk and the surrounding medium. Both the stress singularity coefficients and contact stress are provided in an explicit form and the former are verified by comparison with the existing ones. The effects of material and geometrical parameters upon the contact stress and stress singularity coefficients are examined and shown in graphic form. Failure initiation of an infinite bi-material plate with two arc inclusions is also discussed.

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