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PL SM NTENN

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

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)



PLASMA FREQUENCY

the electron plasma frequency the ion plasma frequency

the plasma frequency:

as the electrons are so much lighter than ions



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



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



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.



IONIZED GAS PLASMA ANTENNA PLASMA TUBE ANTENNA



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.



PHYSICAL PROCESSES



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



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.



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.



ADVANTAGES

Higher Power

Enhanced bandwidth

Higher efficiency

Lower noise

Perfect reflector

Low in weight

Smaller in size

Improved reliability



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.



REFERENCES

•www.wikipedia.org

•www.seminaron.in

•www.seminarelectronicstopic.com

•www.techalone.com

•www.authorstream.com

http://www.wikipedia.org/

http://www.seminaron.in/

http://www.seminarelectronicstopic.com/

http://www.techalone.com/

http://www.authorstream.com/

http://www.authorstream.com/







http://www.wikipedia.org/



THANK YOU

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