Article Dans Une Revue Radio Science Année : 2020

Impedance and voltage power spectra of a monopole antenna in a warm plasma -- derivation and application to CubeSats

Résumé

The impedance for a monopole antenna is derived and compared with the cases for wire dipole and double-sphere antennas. This derivation produces a new expression for the monopole antenna response function, $F_{m1}(x)$. The monopole, wire dipole, and double-sphere response functions are compared by modeling an antenna in Earth's ionospheric plasma (i.e. electrostatic and collisionless) and predicting the antenna capacitance and voltage power spectra for quasi-thermal noise (QTN) and shot noise. The monopole antenna current distribution is assumed to be a half-triangular current distribution (considering only the positive half of the triangular distribution). The predictions for the shot noise and capacitance presented problems, as the integral over wavenumber-space or $k$-space did not converge for large values of $k$. The derived expression therefore remains a current problem and necessitates future work to determine a more general expression. In this paper we bring the problem of an appropriate analytic monopole antenna response function to the attention of the community and outline a number of tests that can be used to verify any future expression.

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hal-02338483 , version 1 (26-09-2025)

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Ronald Maj, Iver H. Cairns, M.M. Martinović. Impedance and voltage power spectra of a monopole antenna in a warm plasma -- derivation and application to CubeSats. Radio Science, 2020, 55 (4), pp.e2019RS006956. ⟨10.1029/2019RS006956⟩. ⟨hal-02338483⟩
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