Terahertz radiation from log-periodic antennas

Terahertz (THz) radiation from high-T/sub c/ superconductors excited with femtosecond optical pulses has opened a new research field in microwave photonics. Previously, we reported the radiation from YBCO dipole and bowtie antennas with powers of sub-/spl mu/W. In the present work, we study the radiation from a YBCO log-periodic antenna.