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RADIO SCIENCE,
VOL. 45,
RS4013,
10 PP., 2010
doi:10.1029/2009RS004266
Direct measurement of the radiation resistance of a dipole antenna in the whistler/lower hybrid wave regime
Basic Plasma Science Facility, Los Angeles, California, USA
Department of Physics and Astronomy, University of California, Los Angeles, California, USA
Basic Plasma Science Facility, Los Angeles, California, USA
An electrically short dipole antenna radiating high-frequency waves is instrumented in such a way as to directly measure its
radiation impedance when immersed in a laboratory plasma. By measuring both current and voltage at the radiating end, transmission
line effects are largely eliminated, and extremely accurate results can be obtained. Initial results are presented for wave
frequencies ranging from lower-hybrid to whistler, for density varying from 2 × 1018 m−3 down to 2 × 1015 m−3. The initial experiments are performed for ω/ωce 
1. At the highest density, the impedance is approximately real, varying from 400 Ω at 30 MHz down to 100 Ω at 180 MHz, while
at the lowest density, the impedance is almost entirely capacitive, at roughly 1.6 pF.
Received 31 August 2009; accepted 31 March 2010; published 27 August 2010.
Citation: (2010), Direct measurement of the radiation resistance of a dipole antenna in the whistler/lower hybrid wave regime, Radio Sci., 45, RS4013, doi:10.1029/2009RS004266.
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