Do you know micro-hole machining? The following editor will explain it!
In the increasingly important stealth and electromagnetic compatibility (EMC) technology, the role and status of electromagnetic wave absorbing materials are very prominent, and their engineering applications are mainly in the following aspects.
1) Stealth technology
Coating absorbing materials on various weapons and facilities such as airplanes, missiles, tanks, ships, warehouses, etc. can absorb reconnaissance radio waves and attenuate reflected signals, thereby breaking through enemy radar defense zones. This is a powerful way of anti-radar reconnaissance. Means, a way to reduce the weapon system from being attacked by infrared guided missiles and laser weapons.
2) Improve the electromagnetic compatibility of the whole machine
The false signals generated by the reflection of electromagnetic waves by the aircraft fuselage may lead to false interception or false tracking of highly sensitive airborne radars; when several radars on an aircraft or a ship are working at the same time, the crosstalk between the radar transmitting and receiving antennas is sometimes very serious , The jammer on board or on the ship will also interfere with the radar or communication equipment on board. In order to reduce such interference, the excellent magnetic shielding of absorbing materials is commonly used abroad to improve the performance of radar or communication equipment. For example, coating the absorbing material on the fuselage, antenna and all surrounding interferences of radar or communication equipment can make them more sensitive and accurate to find the enemy target; coating the absorbing material on the surrounding wall of the opening of the radar parabolic antenna, It can reduce the sidelobe's interference to the main lobe and increase the distance of the transmitting antenna, and it can reduce the interference of false target reflection on the receiving antenna; the application of absorbing materials in the satellite communication system will avoid the interference between communication lines and improve The sensitivity of the spaceborne communicator and the ground station, thereby improving the communication quality.
3) RFID antenna anti-metal isolation application
This application mainly utilizes the high track rate characteristics of a type of high magnetic track rate, low loss type wave absorbing material; when in use, insert the wave absorbing plate between the 13.56MHz loop antenna and the metal substrate to increase the induced magnetic field through the wave absorbing material In itself, it reduces the chance of passing through the metal plate, thereby reducing the induced eddy current in the metal plate, thereby reducing the loss of the induced magnetic field. At the same time, because of the insertion of the absorber, the measured parasitic capacitance will also be reduced, and the frequency offset will be reduced. It is consistent with the resonant frequency of the card reader, thereby improving the reading distance. Of course, the degree of improvement depends on the excellent degree of the characteristics of the absorbing material.