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Flexible kirigami with local cylindrical shell design for stretchable microstrip antenna

机译：Flexible kirigami with local cylindrical shell design for stretchable microstrip antenna

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摘要

This paper proposes a flexible kirigami structure. It has rotating rigid squares and cylindrical shells to improve the flexibility of the structure and produce snap-through instability. First, a mechanical spring model based on a quarter of unit cell was established to predict the mechanical characteristics of its deployment. The elastic deformation energy stored in the mechanical system was calculated, and the applied force was obtained after deriving the displacement. By assuming that the rotational stiffness of the spring is related to the length, elastic modulus, and thickness of the cylindrical shell, the coefficients used to quantify the stiffness of the rotational spring were obtained through a finite element calculation and the mechanical characteristics of the structure were obtained. The accuracy was verified through experiments and the finite element method. Then, the deployment mechanism and parameterization of the structure were analyzed. The snap-through characteristics of the cylindrical shell were analyzed, and the curvature of the second steady state was obtained using the minimum potential energy. The influence of the geometric parameters of the unit cell, such as its length, thickness, and the center angle of the cylindrical shell, on the snap-through instability was analyzed. By stretching or compressing it at different positions, different mechanical characteristics of the deployment were obtained. Finally, based on the designed structure, a stretchable microstrip antenna was designed to achieve high gain while the center frequency remained fixed. An antenna was fabricated and measured, and the test results are in good agreement with the simulated results. This work may provide theoretical guidance for the design and application of deformable structures.

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