02-03-2011, 03:49 PM
presented by:
Kumari Nisha Mishra
[attachment=9378]
What is Plasma ?
By supplying energy the states of matter changes: from solid to liquid and from liquid to gas. If further energy is added to a gas it becomes ionized and passes over into the Plasma state – a fourth state of matter.
Plasma is a gas in which a certain portion of the particles are ionized. The presence of a non-negligible number of charge carriers makes the plasma electrically conductive so that it responds strongly to electromagnetic fields.
Plasma – the fourth aggregate state of matter was identified by an English physicist Sir William Crooks in 1879.
Plasma has properties quite unlike those of solids, liquids, or gases and is considered be a distinct state of matter.
What is plasma antenna technology?
Plasma antenna technology is that which employs ionized gas enclosed in a tube as conducting element.
This is a fundamental change from traditional antenna design that generally employs solid metal wires as the conducting element.
Ionized gas is an efficient conducting element with a number of important advantages. Since the gas is ionized only for the time of transmission or reception, ringing and associated effects of solid wire antenna design are eliminated.
This technology has advanced to provide unique antenna designs for applications ranging from general broadcast of radio frequency signals for public use to complex weapon systems.
Features Of Plasma Antenna
Plasma antenna has the ability to focus a signal beam easily and to communicate signals in very short pulses, which could prove extremely useful in the areas of digital communications and radar.
Changes in the ion density can result in instantaneous changes in bandwidth over wide dynamic range.
Plasma Antenna are reconfigurable for frequency, bandwidth, gain, length of plasma column, radius of glass tube.
Plasma Antenna can transmit and receive from same aperture provided the frequencies are widely separated.
How does Plasma antenna works?
A plasma antenna generates localized concentrations of plasma to form a plasma mirror which deflects an RF beam launched from a central feed located at the focus of the mirror.
An ionized region, or solid state plasma, can be generated in silicon using electronically controlled devices (plasma diodes) that are positioned between closely spaced metalized surfaces which constrain the beam.
The plasma can be freely moved by switching groups of plasma diodes on and off that follow the desired geometry of the reflector
The resulting pattern of plasma diodes forms a rosette of overlapping reflectors only one of which is active (i.e. reflecting) at any one time. This enables the beam to be steered quickly without the need for mechanical motion.
In some realizations, the silicon disc (ie Si wafer) can act as a cylindrical lens, to form a lens or reflector system that enables the RF energy to be collimated. Working of Plasma antenna is shown in the figure:
Diagram showing working of Plasma antenna
How Plasma Antenna different from Traditional Antenna? Plasma Antenna Traditional Antenna
1. Electronic movement is made even more easily inside the plasma antenna, because of electrons are in a free state inside the hot gas.
Solid metal antenna can function because electrons move freely in the metal conductor.
Traditional antenna are less efficient, more in weight and larger in size.
Traditional antenna can’t be easily switched on and off.
Some types of Plasma antenna
Multiple Tube Plasma Antenna
Selectable Multibeam Antenna
Advantages of Plasma antenna
High gain
Low interference
Low latency
Wide bandwidth
Affordable
Compact and light weight
Maintainace free
Modular
Disadvantages of Plasma antenna
Applications of Plasma Antenna
Plasma antenna has a number of applications in defense, space and homal appliances.
Network Equipment Providers and Systems Integrators
Network Operator
Public Safety
Networks Sensing Defense
In Microwave Communication Plasma Antenna Provide Ease for realignment of long range directional antennas. -Low Cost for the network owner.
Conclusion
Antennas constructed of metal can be big and bulky, and are normally fixed in place. The fact that metal structures cannot be easily moved when not in use limits some aspects of antenna array design.
Kumari Nisha Mishra
[attachment=9378]
What is Plasma ?
By supplying energy the states of matter changes: from solid to liquid and from liquid to gas. If further energy is added to a gas it becomes ionized and passes over into the Plasma state – a fourth state of matter.
Plasma is a gas in which a certain portion of the particles are ionized. The presence of a non-negligible number of charge carriers makes the plasma electrically conductive so that it responds strongly to electromagnetic fields.
Plasma – the fourth aggregate state of matter was identified by an English physicist Sir William Crooks in 1879.
Plasma has properties quite unlike those of solids, liquids, or gases and is considered be a distinct state of matter.
What is plasma antenna technology?
Plasma antenna technology is that which employs ionized gas enclosed in a tube as conducting element.
This is a fundamental change from traditional antenna design that generally employs solid metal wires as the conducting element.
Ionized gas is an efficient conducting element with a number of important advantages. Since the gas is ionized only for the time of transmission or reception, ringing and associated effects of solid wire antenna design are eliminated.
This technology has advanced to provide unique antenna designs for applications ranging from general broadcast of radio frequency signals for public use to complex weapon systems.
Features Of Plasma Antenna
Plasma antenna has the ability to focus a signal beam easily and to communicate signals in very short pulses, which could prove extremely useful in the areas of digital communications and radar.
Changes in the ion density can result in instantaneous changes in bandwidth over wide dynamic range.
Plasma Antenna are reconfigurable for frequency, bandwidth, gain, length of plasma column, radius of glass tube.
Plasma Antenna can transmit and receive from same aperture provided the frequencies are widely separated.
How does Plasma antenna works?
A plasma antenna generates localized concentrations of plasma to form a plasma mirror which deflects an RF beam launched from a central feed located at the focus of the mirror.
An ionized region, or solid state plasma, can be generated in silicon using electronically controlled devices (plasma diodes) that are positioned between closely spaced metalized surfaces which constrain the beam.
The plasma can be freely moved by switching groups of plasma diodes on and off that follow the desired geometry of the reflector
The resulting pattern of plasma diodes forms a rosette of overlapping reflectors only one of which is active (i.e. reflecting) at any one time. This enables the beam to be steered quickly without the need for mechanical motion.
In some realizations, the silicon disc (ie Si wafer) can act as a cylindrical lens, to form a lens or reflector system that enables the RF energy to be collimated. Working of Plasma antenna is shown in the figure:
Diagram showing working of Plasma antenna
How Plasma Antenna different from Traditional Antenna? Plasma Antenna Traditional Antenna
1. Electronic movement is made even more easily inside the plasma antenna, because of electrons are in a free state inside the hot gas.
Solid metal antenna can function because electrons move freely in the metal conductor.
Traditional antenna are less efficient, more in weight and larger in size.
Traditional antenna can’t be easily switched on and off.
Some types of Plasma antenna
Multiple Tube Plasma Antenna
Selectable Multibeam Antenna
Advantages of Plasma antenna
High gain
Low interference
Low latency
Wide bandwidth
Affordable
Compact and light weight
Maintainace free
Modular
Disadvantages of Plasma antenna
Applications of Plasma Antenna
Plasma antenna has a number of applications in defense, space and homal appliances.
Network Equipment Providers and Systems Integrators
Network Operator
Public Safety
Networks Sensing Defense
In Microwave Communication Plasma Antenna Provide Ease for realignment of long range directional antennas. -Low Cost for the network owner.
Conclusion
Antennas constructed of metal can be big and bulky, and are normally fixed in place. The fact that metal structures cannot be easily moved when not in use limits some aspects of antenna array design.
