plasma antenna 1

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OUTLINE OF THE PRESENTATION INTRODUCTION

PLASMA

ANTENNA

PLASMA ANTENNA TECHNOLOGY

WORKING PRINCIPLE OF PLASMA ANTENNA

PHYSICAL PROCESSES IN PLASMA ANTENNA

CHARACTERSTICS

APPLICATIONS

ADVANTAGES

CONCLUSION

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INTRODUCTION Plasma Antenna is a special type of

antenna in which the metal conducting

elements of a conventional antenna are

replaced by a plasma.

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PLASMA Fourth state of matter similar to gas. Sir William Crookes, an English Physicist

identified it in 1879.

According to Marklands technology, plasmas

are conductive assemblies of charged and

neutral particles and fields that exhibit

collective effects.

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ANTENNA It is defined as an electrical conductor of a

specific length that radiate radiowaves

generated by a transmitter and collect thatwaves at the receiver.

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GENERATION OF ELECTRIC AND MAGNETIC FIELD

When voltage applied to an antenna,electric field

produced.

Causes current to flow in antenna.

Due to current flow,magnetic field produced.

These two fields are emitted from an antenna and

propagate through space over very long distances.

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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.


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FIGURE OF ANTENNA


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FIGURE OF PLASMA TUBE ANTENNA


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WORKING PRINCIPLE

When supply is given to the tube, the gas inside itgets ionised to plasma.

When plasma is highly energised, it behaves as a

conductor.Antenna generates a localised concentration of

plasma to form a plasma mirror that deflects RFbeam launched from a central feed located at

focus of mirror.


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WORKING PRINICIPLE FIGURE


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PHYSICAL PROCESSESA plasma jet has diameter a is formed in the

atmosphere and passes through a dielectric

cylinder that has diameter b and a conductivespiral is winded on the cylinder.

FIGURE OF PLASMA ANTENNA DESIGN:


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OPERATION

When plasma jet enters into the spiral field,signals are emitted.

The spiral is a localised concentration ofplasma.

These spirals behave as plasma mirrorswhich helps in transmission of RF signals.


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CHARACTERSTICSGas ionizing process can manipulate

resistance and when deionized,the gas has

infinite resistance and doesnot interactwith RF radiation.

After sending pulse,it can be deionizedand elliminates ringing effect.


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PLOT OF SPIRAL CURRENT


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TRADITIONAL ANTENNA VS PLASMA ANTENNA

Unlike simple directional antennas, Plasma Antennasselectable multi-beam antennas are electronicallysteered,avoiding the need for manual or mechanical alignment andrealignment of fixed point-to-point communication

links. Plasma Antennas selectable multi-beam antennasprovide similar advantages to phased arrayantennas but ata fraction of the cost, together with much wider bandwidthof operation.

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APPLICATIONS

In highspeed digital communication and radar system.

In radio antenna.

Stealth for millitary application.

Used for transmission and modulationtechniques(PM,AM,FM).


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ADVANTAGES

Higher Power

Enhanced bandwidth

Higher efficiency

Lower noisePerfect reflector

Low in weight

Smaller in size

Improved reliability


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plasma antenna 1

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