Errymath: anti-stealth radar

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<a href="http://www.bestchinanews.com/Military/9294.html" target="_blank">New materials</a> will increase the radar detection range by 50 times  
Modern
 combat is a war based on electronic technology. 
Whoever has the 
advantage of electronic equipment can seize the electromagnetic power 
and seize it. The dominance of battlefield information. In the case of
 one-way transparency, the enemy is attacked. The performance of the 
electronic device is closely related to the material. 
 
For example, the 
F-16 and F-22 use active phased array radar, but the materials are 
completely different and the performance is very different. . 
The 
material mentioned here refers to the semiconductor material, which 
measures the main index power/mass ratio and reaction sensitivity of the
 semiconductor material. The former describes how much the device power 
is at a certain quality, and the latter describes the device's working 
state conversion and small signal detection capability. 
 
The US F-22 airborne radar AN/APG-77 
uses a semiconductor based on gallium nitride, and its electron mobility
 and mass-to-power ratio are improved relative to conventional GaAs 
radar, 5 to 10 times. This means that in the same radar and the same 
quality, the target can be detected more than 1.5 times the opponent's 
distance, which will inevitably bring great tactical advantages. 
 
A paper published by Professor 
Xu Yuzhen entitled "Interfacial Solution Method for Synthesizing 
Semiconductor Two-Dimensional Polymers" is very noteworthy, indicating 
that China has the ability to prepare two-dimensional semiconductor 
materials in the laboratory, and the power of this material will be 
large. Amplitude improves the performance of electronic devices. 
 
<img src="http://www.bestchinanews.com/1ydzximg/0JhzCPyWca" /> 
 
The
 so-called two-dimensional semiconductor is relatively three-dimensional
 semiconductor, this semiconductor is very thin, only one by thickness 
The atomic composition of electrons in such semiconductors is very fast 
compared to bulk three-dimensional semiconductors. 
This is because, 
limited to the three-dimensional space environment, after the voltage is
 applied, although the electrons in the semiconductor partially move in a
 substantially certain direction, the whole will fly in a 
three-dimensional space, and most of the motion energy is consumed. In a
 two-dimensional semiconductor, electrons cannot move to the third 
dimension, which greatly increases the current. How much is this 
performance increase? 
 
The conclusion of the National Nanoscience Center
 paper is that the power quality ratio is 1000 times! Reaction 
sensitivity exceeds 6000 times! 
What does this mean? I will give you 
the calculation of this account. 
 
The detection range of the 
radar is proportional to the power of the fourth power of the 
sensitivity. After using this material, the same volumetric radar will 
be able to achieve 50 times the existing radar! 
Taking the F-22 as an 
example, the RCS minimum value is 0.0001m2, which can reduce the 
detection distance of the existing radar to the normal fighter by 13 
times. 
An airborne radar capable of detecting 150 kilometers can only 
find F-22 near 10 kilometers, but when the radar uses two-dimensional
 semiconductor materials, it can find the F-22 at 576km. 
 
Considering 
that the stealth capability of the stealth aircraft is almost at the 
limit, especially it is difficult to reduce the minimum value, so it can
 be said that once the species. 
When the radar is put into production, 
the myth of the stealth plane can no longer be reproduced. 
 
 In addition,
 it should be noted that this new material has the advantages of 
softness and plasticity. Under the influence of this feature, it is also
 possible to study the conformal radar antenna array that can be 
attached to the surface of the aircraft. 
<img src="http://www.bestchinanews.com/1ydzximg/0JhzCPHB1Z" /> 
 
Two-dimensional
 semiconductor materials generally have thermal stability, which makes 
it possible to control by chemical methods, the general method It is a 
chemical vapor phase transport method that first synthesizes a 
semiconductor alloy block and then uses a mechanical lift-off method for
 preparation. 
 
In the case of dichalcogenide, the chemical vapor 
transport method refers to placing a single component powder material 
and a certain amount of transport reagent in a vacuum quartz tube, and 
the quartz tube is placed in a certain amount. 
The temperature gradient
 of the reaction tube, and finally placed one end in a high temperature 
environment, one end placed in a low temperature environment, in the low
 temperature area will grow alloy monomer ingots. 
By repeated 
mechanical stripping, a two-dimensional disulfide material can be 
produced on a substrate of about 30 nm, but this method is rough, time 
consuming, and difficult to mass produce. 
 Later, scientists invented 
physical vapor deposition and chemical vapor deposition. 
 
<img src="http://www.bestchinanews.com/1ydzximg/0JhzCPfbfa" /> 
 
Physical
 vapor deposition refers to the direct evaporation of a single component
 powder source at high temperatures and the deposition of condensation 
at low temperatures. A single-layer two-dimensional semiconductor 
material is obtained, and the temperature gradient in the deposition 
zone is extremely critical. If the operation is normal, a 
two-dimensional semiconductor film is finally obtained. 
 Chemical vapor 
deposition refers to the use of an oxide and a material to be prepared 
as a reaction source, which is volatilized at a specific high 
temperature and undergoes a chemical reaction, and finally a film of a 
two-dimensional semiconductor material is deposited in the vicinity of 
the container. 
 
The research group of Professor Xu Yuzhen is to 
improve the chemical vapor deposition method, using 1,4-trisonitrile to 
synthesize nitrile trimerization at the interface between 
dichloromethane and trifluoromethanesulfonic acid. Two-dimensional 
containing triazine polymer, this two-dimensional polymer has excellent 
dispersibility in organic solvents. 
 
This makes it possible to form a 
flexible polymer film with a fixed size by simply filtering, and even 
more magically, it can be suitably fabricated into a field effect 
transistor device and directly used for various electronic semiconductor
 components. 
 
<img src="http://www.bestchinanews.com/1ydzximg/0JhzCPYtNW" /> 
 
However, we should also see that the idea of developing this material
 is good, but it is still very practical. The road to the far is going.
 Two-dimensional semiconductor materials can only exist in a small part
 of the laboratory, which is costly, and there is currently no way to 
solve the problem of large-scale manufacturing. 
 
If you can make a few 
millimeters at a time, it is already at the top of the world. Moreover,
 the manufacture of a few millimeters has been to concentrate all the 
human and material resources of the entire laboratory for a long time. 
However, two-dimensional semiconductor materials are the development 
direction of future radar electronic systems, both China and the United 
States are engaged, but now they are just in their infancy. 
 
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The nemesis of the stealth fighter?

New materials will increase the radar detection range by 50 times Modern combat is a war based on electronic technology. Whoever h...

Errymath

The nemesis of the stealth fighter?

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