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What is wrong in this superscatterer sctructure?

Kee Ung Bae, KAIST

I read a paper about superscatterer blocking structure. [1]

[1] Xudong Luo, Tao Yang, Yongwei Gu, Huanyang Chen, Hongru Ma, 'Conceal an entrance by means of superscatterer,' Applied Physics Letters 94, 223513 (2009).

Unlike what is shown in the paper, EM waves leak in my simulations as shown in the attached image. Would anyone help me or correct me with this simulation of superscatterer concealing structure?

I also attached cylindrical superscattering structure for sharing or exchanging.

Thanks in advance.

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