Electromagnetic band-gap structure design using the auxetic unit-structure for easily controllable tunability

• Published in: Journal of applied physics 2014-12, Vol.116 (24)
• Main Authors: Lim, Heeseung, Shin, Dongheok, Kim, Kyoungsik, Yoo, Jeonghoon
• Format: Article
• Language: English
• ISSN: 0021-8979; 1089-7550
• DOI: 10.1063/1.4904351

Tunable electromagnetic band-gap structures for matching an intended band-gap range have more potential for various applications than ordinary electromagnetic band-gap structures with a fixed or non-linearly variable band-gap range. However, there has not been much progress on the study of the appropriate shape of the structure. To obtain a controllable and tunable electromagnetic band-gap, we propose a new design concept employing a unit-structure with a negative Poisson's ratio close to −1 to realize an approximately linear band-gap shift according to the variation of the shape of the structure. We used a structural optimization procedure based on the phase field method to obtain the design of the unit-structure. We investigated the relation between the auxetic unit-structure deformation and the change in the band-gap range through numerical simulations and also evaluated the possibility to realize the design experimentally in the radio frequency range.