Radiation and reception characteristics of an electron plasma wave from grid antennas having a d.c. biased parasitic grid

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Abstract
The radiation and reception characteristics of an electron plasma wave from closely spaced double grids, one of which is a d.c. biased parasitic grid (unfed by r.f.-signal), are investigated experimentally. As a result, it is found that the radiation and reception with high efficiency of an electron plasma wave are enhanced by about 50% by the presence of the parasitic grid with a Floating d.c. potential. The directional radiation and reception patterns of this antenna can also be made unidirectional with an increased radiation and reception efficiency by about 20% by the appropriately biased parasitic grid.