Abstract
The beaming of millimeter waves from two-dimensional plasma photonic crystal waveguides is studied numerically based on a finite difference time domain simulation. It is shown that the beaming of millimeter waves is due to coupling with surface lattice modulation in plasma photonic crystals having a glass-rod lattice in the background discharged plasma, while millimeter-wave beaming is due to the horn antenna of plasma rods in plasma photonic crystals having a plasma-rod lattice in a vacuum.