Abstract
Electromagnetic cloak is a device which makes an object \invisible for electromagnetic irradiation in a certain frequency range. Material parameters for the complementary medium-assisted external cylindrical cloak with arbitrary cross section are derived based on combining the concepts of complementary media and transformation optics. It can make the object with arbitrary shape outside the cloaking domain invisible, as long as an \antiobject is embedded in the complementary layer. The external cloaking efiect has been verifled by full-wave simulation. Moreover, the efiect of metamaterial losses is studied, and small losses less than or equal to 0.01 do not disturb the cloaking efiect.
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