free-space wave

free-space wave

[′frē ‚spās ′wāv]
(electromagnetism)
An electromagnetic wave propagating in a vacuum, free from boundary effects.
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1], (9), are the free-space wave impedances and are calculated with the measured reflection coefficients from measurements 1 and 2.
An antenna is usually defined as the structure associated with the region of transition between a guided electromagnetic wave and a free-space wave.