Flexible absorbing materials convert electromagnetic waves into heat energy

How flexible absorbing materials convert electromagnetic waves into thermal energy.

1. Flexible absorbing materials refer to a class of materials that can effectively absorb human-radiated electromagnetic waves and attenuate their scattering. It converts human-radiated electromagnetic waves into heat energy or other forms of energy through various loss mechanisms of materials to achieve the purpose of absorbing waves and stealth.
2. The so-called practice wave absorbing material refers to a material that can absorb most of the electromagnetic waves projected on its surface and convert it into other forms of energy (mainly heat energy) with almost no reflection.
3. The so-called flexible absorbing material refers to a class of materials that can absorb and attenuate incident electromagnetic waves, convert their electromagnetic energy into heat energy and dissipate them or make electromagnetic waves disappear due to interference. Flexible absorbing materials have structural type and coating type. The latter is composed of binder and absorbent. The ability to absorb waves is mainly related to the type of absorbent.
4. The absorbing principle of flexible absorbing materials electromagnetic wave absorbing materials, often referred to as flexible absorbing materials, refer to a class of functional materials that can effectively absorb incident electromagnetic waves to significantly attenuate the target echo intensity.
5. Flexible absorbing materials refer to materials that can absorb electromagnetic wave energy projected on its surface and convert electromagnetic wave energy into heat energy or other forms of energy through dielectric loss. In recent decades, flexible absorbing materials have been developed by leaps and bounds, but it is difficult for traditional flexible absorbing materials to meet the requirements of thinness, lightness, width and strength.

The future development trend of flexible absorbing materials:

As the operating frequency of the circuit continues to increase, the cavity of the circuit board continues to decrease, and cavity resonance has become an increasingly common problem. There are many ways to solve this problem. Advanced engineering can solve this problem; but the quickest and most economical method is to use flexible absorbers to attenuate cavity resonances.

Many microwave circuit designers these days have encountered this situation: After placing the circuit board in the circuit board housing, the circuit board does not work as expected. The reason is that after the circuit board is put into the cavity, the microwave signal will resonate in the cavity, and the cavity resonance will cause the circuit impedance condition to change, and the specific impedance condition is very important for the normal operation of the microwave circuit. With the continuous increase of circuit operating frequency, cavity resonance has gradually become a very common problem in microwave circuit design. Cavity resonance can be a problem because the designed circuit must be shielded with a board cover, and it is when adding a board cover that problems can arise.

For the purpose of electromagnetic shielding, the circuit board cover is usually made of metal material. This creates a cavity above the circuit board, which induces resonance. Cavity resonance effects have become a major problem as operating frequencies get closer to microwave and even millimeter-wave frequency bands. The use of microwave absorbing materials in the cavity to attenuate cavity resonances is an extremely effective method. The flexible absorbing material uses the principle of electromagnetic energy conversion to convert electromagnetic energy into heat energy without reflection and secondary pollution.

Features and benefits of different flexible absorbing material:

1. High-permeability wave-absorbing material can effectively absorb electromagnetic radiation and magnetic field interference in the frequency range of 300MHz~6GHz, and has excellent magnetic permeability and low absorption rate at 13.56MHz, which can prevent energy loss caused by magnetic field escape;
2. High-frequency absorbing materials can effectively absorb electromagnetic radiation and magnetic field interference in the frequency range of 50MHz~10GHz;
3. Standard absorbing materials can effectively absorb electromagnetic radiation and magnetic field interference in the frequency range of 300MHz~6GHz;
4. Thermally conductive wave-absorbing material, which has both thermal countermeasures and electromagnetic wave countermeasures, a flexible thermally conductive wave-absorbing material that integrates dual functions, which can solve problems in limited space and time, simplify mechanism design, reduce product costs, and at the same time thermally conductive wave-absorbing materials. The soft silicone substrate can reduce the internal stress and tolerance, so that the end product has a better reliability design. These four kinds of absorbing materials are suitable for solving electromagnetic interference or radio frequency interference generated by electronic devices, and thermally conductive absorbing materials are especially suitable for communication field.

Shenzhen PH Functional Materials has a variety of products, covering a wide range of applications, such as RMS series for solving electromagnetic interference, commonly used RMS05, RMS40, RMS120, RMS150, RMS180, RMS200, etc., with thicknesses of 0.05mm, 0.1mm, 0.15mm, 0.2 mm, 0.3mm, 0.5mm, 1.0mm, etc., can be used in various frequency bands from 10Mhz to 18Ghz, which can solve the electromagnetic interference problem of each module or complete the rectification of electromagnetic exceeding the standard. In addition, the NFS series can be used in RFID, NFC scenarios; Improve the problem of reading and writing failure of RFID electronic tags, antennas, readers, IC cards, bus cards and other radio frequency electronic products when encountering metal, and play a role in resisting metal interference. The effect is obvious at 13.56MHz; high surface resistance can be used In more complex circuits; the high-viscosity bonding effect makes it more reliable during application; it has passed ROHS, HF, REACH certification, and has aging resistance.