Slide 1: PLASMA ANTENNA Presented by:BIRAJA PRASANNA JENAREGD NO: 0701219141BRANCH: ELECTRONICS AND TELECOMMUNICATION
Mrs. BISMITA DASH OUTLINE OF THE PRESENTATION : OUTLINE OF THE PRESENTATION INTRODUCTION
PLASMA ANTENNA TECHNOLOGY
WORKING PRINCIPLE OF PLASMA ANTENNA
PHYSICAL PROCESSES IN PLASMA ANTENNA
CONCLUSION INTRODUCTION : INTRODUCTION Plasma Antenna is a special type of antenna in which the metal conducting elements of a conventional antenna are replaced by a plasma. PLASMA : 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. ANTENNA : ANTENNA 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. GENERATION OF ELECTRIC AND MAGNETIC FIELD : 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. PLASMA ANTENNA TECHNOLOGY : 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 : IONIZED GAS PLASMA ANTENNA Slide 9: FIGURE OF ANTENNA FIGURE OF PLASMA TUBE ANTENNA : FIGURE OF PLASMA TUBE ANTENNA WORKING PRINCIPLE : WORKING PRINCIPLE 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 PRINICIPLE FIGURE : WORKING PRINICIPLE FIGURE PHYSICAL PROCESSES : PHYSICAL PROCESSES 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: OPERATION : OPERATION 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. CHARACTERSTICS : CHARACTERSTICS 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”. PLOT OF SPIRAL CURRENT : PLOT OF SPIRAL CURRENT APPLICATIONS : APPLICATIONS In highspeed digital communication and radar system.
In radio antenna.
Stealth for millitary application.
Used for transmission and modulation techniques(PM,AM,FM). ADVANTAGES : ADVANTAGES Higher Power
Low in weight
Smaller in size
Improved reliability CONCLUSION : 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 : REFERENCES www.wikipedia.org
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