Radiation from an axial electric dipole with prolate spheroidal metamaterial cloak cover
Exact analytical expressions for the electromagnetic field due to a dipole source located inside and along the axis of symmetry of a prolate spheroid are provided.
Exact Imaging by an Elliptic Lens
The radiation from an isotropic line source located at one of the focal lines of an elliptic cylindrical lens filled with a homogeneous and lossless DNG metamaterial is determined exactly in the frequency domain. This exact solution is compared to a previously derived optical solution.
Substation automation based on IEC 61850 with new process-close technologies
New technologies in primary equipment like nonconventional instrument transformers require new interfaces to the substation automation system. The future standard IEC 61850 perfectly supports this requirement. With the introduction of the new technologies and the use of IEC 61850, a more decentralized architecture of the substation automation system will be possible. This provides several benefits but a careful system design is required to maintain the overall reliability of the system.