モノポールアンテナによる電子プラズマ波送受信特性

概要

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Electron plasma waves were transmitted and received by monopole antennas, i.e. a grid, a circular plate, parallel plane grids and a gridded parallel plate in a warm unbounded plasma. The radiation patterns of these antennas have been measured experimentally and they agree with theoretically predicted patterns based on a fluid model description for electrons. The reciprocity theorem for a pair of antennas holds experimentally if the d.c. bias potential of the antennas is lower than about the floating potential and if the grounding resistance is much smaller than the antenna reactance. The measured reception patterns of an antenna is equal to its radiation pattern. The equivalent capacitance between the antenna and the plasma was measured as a function of the wavelength of the wave. The capacitance was also measured indirectly using the reciprocity theorem.
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