Plasma antenna

PLASMA ANTENNA

Telugunta Ravi kiran4th e.c.eSri 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 charged and 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 PLASMAHIGH 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 conductive and 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 plasma mirror that deflects RF beam launched from a central feed located at focus of 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 RF signals.

WORKING

CHARACTERSTICSGas 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.

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.

ADVANTAGESHigher 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 dielectric antenna action.

• It helps in pulse operation.

REFERENCES

• www.wikipedia.org

• www.seminaron.in

• www.seminarelectronicstopic.com

• www.techalone.com

• www.authorstream.com

THANK YOU