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Plasma antenna
Date:2018-09-21  Source:http://atwzntx.com/en/  Pageviews:251

Antennas are an important part of all RF communication systems.

Plasma antenna technology does not use traditional metal design, but uses gas plasma antenna technology. This new antenna design technology has great potential for military and civilian use. Compared to conventional antennas, plasma antennas have unparalleled advantages.

 

 

The transmission and reception of radio frequency signals, from general broadcasting to various complex weapon systems, has in common that a certain size of metal conductor is used to radiate or receive electromagnetic waves at a selected frequency. Since the metal antenna is designed to be difficult to change in structure, it is not easy to achieve a relatively ideal state due to factors such as environment and matching in actual use, that is, the efficiency of the metal antenna is lowered.

  

 

Since the plasma antenna uses the ionized gas as the electromagnetic energy transmission medium, the antenna bandwidth, frequency, gain, and directivity can be dynamically reconstructed by controlling parameters such as the shape and intensity of the plasma. Antennas designed with plasma antenna technology are more efficient, lighter in weight, smaller in size, shorter in size, and wider in bandwidth than conventional antennas. Since the plasma antenna is in the form of a gas, it is more concealed in terms of appearance and fluid mechanics. Many countries in the West have carried out research on the military aspect of plasma antennas, and its important scientific research and application value is self-evident.

 

 

This new antenna design concept has many unique advantages over traditional metal antennas, including:

 

Invisibility: When the ionization state is removed, the plasma antenna will not generate backscattered radar waves, nor will it absorb high-power microwave radiation that can reduce the effectiveness of electronic countermeasures;

 

Adapt to multiple signals: Plasma antennas have dynamically reconfigurable characteristics such as bandwidth, frequency, gain, and directivity;

 

Easy to deploy remotely: Plasma antennas can be lighter and smaller than conventional antenna designs;

 

More efficient: The plasma antenna reduces the impact excitation effect well, which improves the performance of short-pulse radar.

 

 

These unique advantages will make plasma antenna technology have broad application prospects, such as for naval surface ship and submarine radar antennas, stealth aircraft radar antennas and ballistic missile defense radar antennas.

 

In the mid-1990s, Anderson first proposed the concept of a plasma antenna, which was designed to make it easier for submarines to communicate when working underwater. There are three major drawbacks to using electromagnetic waves to emit electromagnetic waves:

First, the low-frequency metal antenna is bulky and easily exposed to the target;

Secondly, when metal antennas operate at high frequencies, although they can be reduced in size, they are easily exposed due to the special signals they emit;

Finally, metal antennas are susceptible to human interference.

The appearance of the plasma antenna is similar to that of a fluorescent tube. The ionized gas tube is used to transmit and receive radio waves. By controlling the shape and intensity of the plasma, the antenna bandwidth, frequency, gain, and directivity can be dynamically reconstructed. Converting the radio frequency, while also working in a phased band like a metal antenna, is more efficient and smaller, and basically overcomes all of the above problems.

Since the plasma antenna reacts only to signals equal to or less than its own operating frequency, the high frequency signals normally used to interfere with the radio waves have no effect on it. The antennas themselves can also be nested within each other while transmitting and receiving multiple radio frequencies without interfering with each other. Working at the same pulse current still keeps the signal clear and consumes 1000 times less energy than a normal antenna.

Once the antenna is turned off, the radio waves are no longer reflected, and the lower the operating frequency, the less likely it is to be detected. This concealment makes it more suitable for the secret military field.

An experiment conducted by Hughes Laboratories in the United States showed that the plasma cross-sectional area of a 13cm-long microwave reflector can be reduced by an average of 20dB in the frequency range of 4 to 14 GHz, that is, the signal strength of the radar acquiring echo is weakened. Up to the original 1%. US naval scientists are still using ionized plasma to develop a radar system that is challenging for weapon design and military tactics. The Naval Research Institute is implementing a research program called Agile Mirror, which aims to develop a new type of shipboard and airborne radar that can track at much faster speeds than existing radars. Attack missiles and make ships and planes more invisible. There is enough free electrons in the structure of the plasma molecule, so it belongs to a high temperature ionized superconducting gas. The superconducting properties of the plasma used in the "Amazing Mirror" are especially suitable for the reflection of radar microwaves, which can reflect radar electromagnetic waves like a mirror. Prototype identification has been completed. If the radar system of the "Amazing Mirror" program is equipped on the fighter aircraft, the weight of the aircraft can be greatly reduced, enabling the aircraft to adopt more advanced guidance systems, avionics and new stealth materials.