  In this paper, we consider two regularized transformation-optics cloaking
schemes for electromagnetic (EM) waves. Both schemes are based on the blowup
construction with the generating sets being, respectively, a generic curve and
a planar subset. We derive sharp asymptotic estimates in assessing the cloaking
performances of the two constructions in terms of the regularization parameters
and the geometries of the cloaking devices. The first construction yields an
approximate full-cloak, whereas the second construction yields an approximate
partial-cloak. Moreover, by incorporating properly chosen conducting layers,
both cloaking constructions are capable of nearly cloaking arbitrary EM
contents. This work complements the existing results in [5--7] on approximate
EM cloaks with the generating set being a singular point, and it also extends
[9,25] on regularized full and partial cloaks for acoustic waves governed by
the Helmholtz system to the more challenging EM case governed by the full
Maxwell system.
