An optimized weighted multi-frequency subspace migration for imaging perfectly conducting, arc-like cracks

In this paper, we consider the performance improvement of multi-frequency subspace migration for non-iterative imaging of thin, arc-like electromagnetic inhomogeneities. For this purpose, multi-frequency subspace migrations weighted by a simple function related to the applied frequency are introduced. The approaches proposed here are in line with recent investigations described in [16], [21]; however, the structure of the proposed subspace migrations is still unknown. Therefore, some numerical simulations are performed to verify whether the proposed algorithm improves on the traditional one.