Characteristics of electric wire antennas onboard scientific spacecrafts [plasma wave observations]

For observation of plasma waves by a scientific spacecraft, we usually use wire dipole antennas for AC electric field and dipole probes for DC field measurement. An accurate value of effective length of the antenna (h/sub eft/) is required to calculate absolute intensities of the electric fields fro...

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Bibliographic Details
Main Authors: Imachi, T., Yagitani, S., Nagano, I., Esaki, S., Higashi, R., Tsutsui, M., Matsumoto, H.
Format: Conference Proceeding
Language:English
Subjects:
Antenna measurements
Dipole antennas
Electric fields
Electric variables measurement
Plasma measurements
Plasma waves
Probes
Space vehicles
Voltage
Wire
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Summary:For observation of plasma waves by a scientific spacecraft, we usually use wire dipole antennas for AC electric field and dipole probes for DC field measurement. An accurate value of effective length of the antenna (h/sub eft/) is required to calculate absolute intensities of the electric fields from the output voltage of the antennas , and it is known as L/2 for wire dipole antennas and L for dipole probes. In this paper, we try to clarify the transition of h/sub eff/ from L to L/2 with frequency. At first, we report the result of a "rheometry experiment" which measures the frequency dependence of h/sub eff/ directly, and then theoretical calculations by using its equivalent circuits. The result clearly explains why the effective length transits.
DOI:10.1109/APRASC.2004.1422557