Plasma Antenna Final Ppt

Guide:- Prof. SameerPresented by:-Anjali Singh

Department of Information TechnologyK J College of Engineering and Management Research

2012 - 2013

INTRODUCTION PLASMA ANTENNA PLASMA ANTENNA TECHNOLOGY WORKING PRINCIPLE OF PLASMA ANTENNA PHYSICAL PROCESSES IN PLASMA ANTENNA CHARACTERSTICS APPLICATIONS ADVANTAGES CONCLUSION

OUTLINE OF THE PRESENTATION

• Plasma Antenna is a special type of

antenna in which the metal conducting elements of a conventional antenna are replaced by a plasma.

INTRODUCTION

• 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.

PLASMA

It is defined as an electrical conductor of a

specific length that radiate radiowaves generated by a transmitter and collect that waves at the receiver.

ANTENNA

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.

GENERATION OF ELECTRIC AND MAGNETIC FIELD

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.

PLASMA ANTENNA TECHNOLOGY

IONIZED GAS PLASMA ANTENNA

FIGURE OF ANTENNA

FIGURE OF PLASMA TUBE ANTENNA

When supply is given to the tube, the gas

inside it gets 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 RF beam launched from a central feed located at focus of mirror.

WORKING PRINCIPLE

WORKING PRINICIPLE FIGURE

A plasma jet has diameter ‘a’ is formed in

the atmosphere and passes through a dielectric cylinder that has diameter ‘b’ and a conductive spiral is winded on the cylinder. FIGURE OF PLASMA ANTENNA DESIGN:

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.

OPERATION

Gas ionizing process can manipulate

resistance and when deionized,the gas has infinite resistance and doesnot interact with RF radiation.

After sending pulse,it can be deionized and elliminates “ringing effect”.

CHARACTERSTICS

PLOT OF SPIRAL CURRENT

In highspeed digital communication and radar

system. In radio antenna. Stealth for millitary application. Used for transmission and modulation

techniques(PM,AM,FM).

APPLICATIONS

Higher Power Enhanced bandwidth Higher efficiency Lower noise Perfect reflector Low in weight Smaller in size Improved reliability

ADVANTAGES

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.

CONCLUSION

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REFERENCES

Bibliography