Log-periodic dipole antenna

A 12-element log-periodic dipole antenna is investigated with the three-term theory described and verified experimentally in a companion paper (Cheong and King, 1967). The general frequency-independent behavior for the distributions of current, the driving-point admittances, and the power for all elements over a wide range of frequencies. The driving-point admittance, field pattern, beam width, and minor-lobe level are determined for the antenna over the same frequency range. The director and reflector action of the elements is pointed out. It is concluded that a new and powerful tool is available for the complete and accurate analysis of log-periodic dipole antennas.