Plasma Antenna 1
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Transcript of Plasma Antenna 1
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A
NISH M N
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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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