Abstract
Up to the 1960's most telecommunication between the continents was realized by large HF (3 to 30MHz) radio systems especially built for that purpose, using the ionosphere as a natural high altitude 'reflector'. Inventions such as adaptive beamforming, antenna diversity, and frequency diversity stem from the 1930's, an impressive achievement considering the technology of that time.
Original language | English |
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Pages (from-to) | 146-147 |
Number of pages | 2 |
Journal | IEEE antennas and propagation magazine |
Volume | 57 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- 2023 OA procedure