ABSTRACT
Plasma antennas are radio frequency antennas that employ plasma as the guiding medium for electromagnetic radiation.
The concept is to use plasma discharge tubes as the antenna elements. When the tubes are energized, they become conductors, and can transmit and receive radio signals. When they are de-energised, they revert to non-conducting elements and do not reflect probing radio signals. Plasma antenna can be "Steered" electronically. Another feature of the plasma antenna is that it can be turned off rapidly, reducing ringing on pulse transmission.
A plasma antenna can be used for both transmission and reception. Although plasma antennas have only become practical in recent years, the idea is not new. A patent for an antenna using the concept was granted to J Hettinger in 1919. Ionized gas plasma antennas can be turned on and off and are good for stealth and resistance to electronic warfare and cyber-attacks.
KEYWORDS:
[Higher Frequency, Plasma, Ionised gas, Antenna, Communication]
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