Some configurations of conical logarithmic spiral antenna (CLSA) arrays are simulated and discussed. CLSA array is a high gain broadband wide beam circularly polarized antenna array, which can be used ...

Having recently read S J Parris’s novel Alchemy, set in 16th century Prague, and finding myself in the Czech capital on a ...

We predict and present the first observation of conical diffraction arising from k-space singularities in the band-structure of a periodic potential. The experiments are carried out in honeycomb ...