Reception Characteristics of Monopole Antennas for Electron Plasma Waves

The radiation patterns of a longitudinal electron plasma wave excited in a warm unbounded plasma by a grid and parallel plane grids and the reception patterns for wire antennas and the grid having a grounded plate were measured experimentally. The results agreed well with theoretically predicted radiation patterns based on a fluid model description for electrons. The dependence of the received amplitude of a gridded parallel plate on the D. C. potential of the antenna was studied. The possibility of estimating the wavelength from measured amplitudes of the wire antenna and the gridded parallel plate is also discussed.