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plasma antenna Ppt
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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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www.google.com
REFERENCES
Bibliography