PL SM NTENN Telugunta Ravi kiran 4 th e.c.e Sri Prakash college of engineering
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 1/18
PL SM NTENN
Telugunta Ravi kiran
4th
e.c.e
Sri Prakash college of engineering
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 2/18
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.
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 3/18
COMPARISION OF STATE OF MATTERS PRESENT IN OUR UNIVERSE
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 4/18
CLASSIFICATION OF PLASMA
PLASMA
COLD PLASMA(at room temperature)
LOW TEMPERATURE PLASMA
HIGH TEMPERATURE PLASMA(at
temperature of 10^8-10^9 K)
HOT PLASMA
(at temperature of 200-
20000k)
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 5/18
PLASMA FREQUENCY
the electron plasma frequency the ion plasma frequency
the plasma frequency:
as the electrons are so much lighter than ions
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 6/18
ANTENNA
Antenna is defined as an electrical conductor of specific length that radiate
radio waves generated by a transmitter and collects that waves at receiver
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 7/18
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 through
space over very long distance
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 8/18
PLASMA ANTENNA TECHNOLOGY
It employs an ionized gas enclosed in a tube as the conducting element of an
antenna.
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.
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 9/18
IONIZED GAS PLASMA ANTENNA PLASMA TUBE ANTENNA
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 10/18
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.
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 12/18
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 RFsignals.
WORKING
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 13/18
CHARACTERSTICS
Gas ionizing process can manipulate resistance and when deionized, thegas has infinite resistance and doesn't 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.
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 14/18
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.
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 15/18
ADVANTAGES
Higher Power
Enhanced bandwidth
Higher efficiency
Lower noise
Perfect reflector
Low in weight
Smaller in size
Improved reliability
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 16/18
CONCLUSION
•It is more advantageous than other antenna due
to ionized gas.
•
Its action has many general with the dielectricantenna action.
•It helps in pulse operation.
8/13/2019 plasmaantenna1-
http://slidepdf.com/reader/full/plasmaantenna1- 17/18
REFERENCES
•www.wikipedia.org
•www.seminaron.in
•www.seminarelectronicstopic.com
•www.techalone.com
•www.authorstream.com