1. PLASMA ANTENNA
Telugunta Ravi kiran
4th e.c.e
Sri Prakash college of engineering
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 charged
and neutral particles and fields that exhibit collective effects.
4. CLASSIFICATION OF PLASMA
PLASMA
HIGH TEMPERATURE PLASMA(at
LOW TEMPERATURE PLASMA temperature of 10^8-10^9 K)
HOT PLASMA
COLD PLASMA
(at temperature of 200-
(at room temperature)
20000k)
5. PLASMA FREQUENCY
the electron plasma frequency the ion plasma frequency
the plasma frequency:
as the electrons are so much lighter than ions
6. 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
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 through
space over very long distance
8. 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 conductive
and allowing radio frequency signals to be transmitted or received.
When gas is not ionized, the antenna element ceases to exit.
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 plasma
mirror that deflects RF beam launched from a central feed located at focus
of mirror.
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. CHARACTERSTICS
Gas ionizing process can manipulate resistance and when deionized, the
gas 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 forms
of digital communication and radars.
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.
16. CONCLUSION
•It is more advantageous than other antenna due
to ionized gas.
•Its action has many general with the dielectric
antenna action.
•It helps in pulse operation.
