PLASMA ANTENNA Telugunta Ravi kiran 4th e.c.e Sri Prakash college of engineering
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.
COMPARISION OF STATE OF MATTERS PRESENT IN OUR UNIVERSE
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)
PLASMA FREQUENCYthe electron plasma frequency the ion plasma frequency the plasma frequency: as the electrons are so much lighter than ions
ANTENNAAntenna is defined as an electrical conductor of specific length that radiateradio waves generated by a transmitter and collects that waves at receiver
ANTENNA PRINCIPLEWhen voltage is applied to an antenna, electric field is producedIt causes current to flow in antennaDue to current flow, magnetic field is produced.These two fields are emitted from an antenna and propagate throughspace over very long distance
PLASMA ANTENNA TECHNOLOGYIt 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.
WORKING PRINCIPLEWhen 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.
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.
CHARACTERSTICSGas ionizing process can manipulate resistance and when deionized, thegas has infinite resistance and doesnt interact with RF radiationAfter 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.
APPLICATIONSIn 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 IntegratorsDefense, Space and Homeland Security.
ADVANTAGESHigher PowerEnhanced bandwidthHigher efficiencyLower noisePerfect reflectorLow in weightSmaller in sizeImproved reliability
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.