PLASMA ANTENNA

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PLASMA ANTENNA :

PLASMA ANTENNA BY-SUBHRAJIT MOHANTY REGD NO- 0801223230 ROLL NO- 08ET083 ELECT & TELE COMM

CONTENTS:

CONTENTS Introduction Features of plasma antenna Working Comparison between plasma antenna and traditional antenna Advantages Disadvantages Applications Conclusion

What is plasma ?:

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 state of matter  similar to gas in which a certain portion of the particles are ionized. Heating a gas may ionize its molecules or atoms, thus turning it into a plasma, which contains charged particles: positive ions and negative electrons. Ionization can be induced by other means, such as strong electromagnetic field applied with a laser or microwave generator, and is accompanied by the dissociation of molecular bonds, if present.

Change of matter:

Change of matter Plasma has properties quite unlike those of solids, liquids, or gases and is considered be a distinct state of matter. Energy / Temperature Molecule Molecule (excited) Ions Free electron Molecular fragment (high energy)

What is plasma antenna ?:

What is plasma antenna ? Plasma antenna are Radio frequency antenna that employ plasma as a guiding medium for electromagnetic radiation. It uses ionized gas instead of metal conducting element of conventional antenna to transmit and receive signals, decreasing interference and boosting the functionality. In this plasma discharge tubes are used as the antenna element. When these Plasma tube is energized, they become conductor and can transmit and receive radio Signal .

How does plasma antenna work??:

How does plasma antenna work?? Plasma antenna technology employs ionized gas enclosed in a tube as a conducting element of an antenna. When the Gas is ionized to a plasma state -then it becomes conductive, allowing radio frequency (RF) signals to be transmitted or received .

How does plasma antenna work ?:

How does plasma antenna work ? In order for plasma to have significant effect on an electromagnetic wave, the electronic density must be increased by several orders of magnitude. When the gas is not ionized or a plasma antenna is turned off - it is transparent and allowing other adjacent antennas to transmit or receive without interference.

How does plasma antenna work ?:

How does plasma antenna work ? A plasma antenna generate s localized concentrations of plasma to form a plasma mirror which deflects an RF beam. The plasma can be freely moved to desired geometry of the reflector by plasma diodes.

How does a plasma antenna work ?:

How does a plasma antenna work ? This enables the beam to be steered quickly without the need for mechanical motion In some realizations, the silicon disc (i.e. Si wafer) act as a cylindrical lens, to form a lens/reflector system that enables the RF energy to be collimated. This prototype plasma antenna is stealthy, versatile ..

Plasma tube antenna:

Plasma tube antenna

Unique charatristics of plasma antenna …..:

Unique charatristics of plasma antenna ….. Does not interact with RF radiation . Eliminating the ringing associated with traditional metal elements. Deionizing the gas antenna will not backscatter radar waves (providing stealth).

Unique charatristics of plasma antenna..:

Unique charatristics of plasma antenna.. Reduced radar cross section provides stealth due to the non-metallic elements. Changes in the ion density can result in instantaneous changes in bandwidth over wide dynamic ranges. After the gas is ionized, the plasma antenna has virtually no noise floor

Unique charatristics of plasma antenna….:

Unique charatristics of plasma antenna…. A single dynamic antenna structure can use time multiplexing so that many RF subsystems can share one antenna resource. Our plasma antenna can transmit and receive from the same aperture provided the frequencies are widely separated.

How Plasma Antennas Different From Other Antennas:

How Plasma Antennas Different From Other Antennas Plasma antenna traditional antenna Electronic movement is made solid metal antenna can function even more easily inside the because electrons can move free plasma antenna, because of ly in the metal conductor . electrons are in a free state inside the hot gas. Plasma antenna greatly conventional metal antennas reduces the effects of can pick up various noises or interference. Interference that bounce of the the surrounding metal objects .

Some types of plasma antenna:

Some types of plasma antenna Multiple tube plasma selectable multibeam antenna antenna

ADVANTAGES OF PLASMA ANTENNA:

ADVANTAGES OF PLASMA ANTENNA Higher Power Enhanced Bandwidth Higher efficiency Lower noise Perfect reflector Low in width Smaller in size

DISADVANTAGES OF PLASMA ANTENNA:

DISADVANTAGES OF PLASMA ANTENNA Plasma volume must be stable and repeatable . Ionizer adds weight and volume . Ionozer increases power consuption .

Applications of plasma antenna:

Applications of plasma antenna MILLITARY APPLICATIONS Shipboard/submarine antenna replacements. Unmanned air vehicle sensor antennas. land-based vehicle antennas. Stealth aircraft antenna replacements.

Application of plasma antenna:

Application of plasma antenna COMMERCIAL APPLICATIONS Telemetry & broad-band communications. Ground penetrating radar. Navigation. Weather radar and wind shear detection. Collision avoidance . High-speed data communication.

QUESTIONS:

QUESTIONS

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