Plasma antenna

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Plasma antenna

  1. 1. PLASMA ANTENNA Telugunta Ravi kiran 4th e.c.e Sri Prakash college of engineering
  2. 2. PLASMA•Fourth state of matter similar to gas.•Sir William Crookes, an English Physicist identified it in 1879.•According to Markland’s technology, plasmas are conductive assemblies of chargedand neutral particles and fields that exhibit collective effects.
  3. 3. COMPARISION OF STATE OF MATTERS PRESENT IN OUR UNIVERSE
  4. 4. CLASSIFICATION OF PLASMA PLASMA HIGH TEMPERATURE PLASMA(atLOW TEMPERATURE PLASMA temperature of 10^8-10^9 K) HOT PLASMA COLD PLASMA (at temperature of 200- (at room temperature) 20000k)
  5. 5. PLASMA FREQUENCYthe electron plasma frequency the ion plasma frequency the plasma frequency: as the electrons are so much lighter than ions
  6. 6. ANTENNAAntenna is defined as an electrical conductor of specific length that radiateradio waves generated by a transmitter and collects that waves at receiver
  7. 7. ANTENNA PRINCIPLEWhen voltage is applied to an antenna, electric field is producedIt causes current to flow in antennaDue to current flow, magnetic field is produced.These two fields are emitted from an antenna and propagate throughspace over very long distance
  8. 8. PLASMA ANTENNA TECHNOLOGYIt employs an ionized gas enclosed in a tube as the conducting element of anantenna.When the gas is electrically charged or ionized to a plasma, it becomes conductiveand allowing radio frequency signals to be transmitted or received.When gas is not ionized, the antenna element ceases to exit.
  9. 9. IONIZED GAS PLASMA ANTENNA PLASMA TUBE ANTENNA
  10. 10. WORKING PRINCIPLEWhen supply is given to the tube, the gas inside it gets ionized to plasma.When plasma is highly energized, it behaves as a conductor.Antenna generates a localised concentration of plasma to form a plasmamirror that deflects RF beam launched from a central feed located at focusof mirror.
  11. 11. PHYSICAL PROCESSES
  12. 12. WORKING When plasma jet enters into the spiral field, signals are emitted. The spiral is a localised concentration of plasma. These spirals behave as plasma mirrors which helps in transmission of RF signals.
  13. 13. CHARACTERSTICSGas ionizing process can manipulate resistance and when deionized, thegas has infinite resistance and doesnt interact with RF radiationAfter sending pulse, it can be deionized and eliminates “ringing effect”. Operates up to 90 GHz. It use ionized gas as conducting material The gas is ionized only for the time of transmission or reception.The design allows for extremely short pulses, important to many formsof digital communication and radars.
  14. 14. APPLICATIONSIn high speed digital communication and radar system.In radio antenna.Stealth for military application.Used for transmission and modulation techniques(PM,AM,FM).Network Equipment Providers and Systems IntegratorsDefense, Space and Homeland Security.
  15. 15. ADVANTAGESHigher PowerEnhanced bandwidthHigher efficiencyLower noisePerfect reflectorLow in weightSmaller in sizeImproved reliability
  16. 16. CONCLUSION•It is more advantageous than other antenna dueto ionized gas.•Its action has many general with the dielectricantenna action.•It helps in pulse operation.
  17. 17. REFERENCES•www.wikipedia.org•www.seminaron.in•www.seminarelectronicstopic.com•www.techalone.com•www.authorstream.com
  18. 18. THANK YOU

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