Conceal an entrance by means of superscatterer
  By using the novel property of the rectangular superscatterer, we propose a design which can conceal an entrance from electromagnetic wave detection. Such a superscatterer is realized by coating a negative index material shell on a perfect electrical conductor rectangle cylinder. The results are numerically confirmed by full-wave simulations both in the far-field and near-field. 
Xudong Luo, Tao Yang, Yongwei Gu, Hongru Ma