A simple active Huygens source for studying waveform synthesis with Huygens metasurfaces and antenna arrays

We have developed a simple active Huygens source consisting of a current strip and a current loop, which is further reduced to two current strips in a 2D environment. We derived the necessary current excitations which would produce a perfect Huygens source, and studied unidirectional plane-wave formation using an infinite array of these sources. The proposed Huygens source forms a simple antenna element for synthesizing an active Huygens metasurface or antenna array. Furthermore, conclusions drawn from studies, made convenient with these elements, can aid the design of active and passive Huygens metasurfaces.