23-07-2014, 03:18 PM
PLASMA ANTENNA
PLASMA ANTENNA.ppt (Size: 1.46 MB / Downloads: 21)
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
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
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
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.
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.
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”.
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.