Shielding test of noise suppression sheet
With the high performance and high functionality of electronic products, the internal circuits of electronic products are also continuously denser, and the signals used are gradually developing to high frequencies, and the incidence of electromagnetic interference noise is also increasing. In order to suppress the problem of electromagnetic interference noise, it is particularly necessary to prevent electronic products from generating electromagnetic interference noise.
The most direct way to solve the noise suppression is to paste the noise suppression sheet at the noise source, which can suppress the spread of the noise, and paste it on the cable and circuit, which can effectively suppress the conducted noise.
Although the noise suppression sheet is extremely light and thin, it has a high EMI noise suppression effect. At the same time, it is flexible and practical and can be used in corner positions. It is very suitable for use in increasingly thin and miniaturized electronic products. In addition, all the materials constituting this product are non-magnetic, so there is no need to limit the use site.
The test of the noise suppression sheet is mainly to meet the standard of IEC62333-2. The test of the noise suppression sheet in the standard is mainly reflected by the five test data of the same-side decoupling ratio, the different-side decoupling ratio, the transmission attenuation ratio, the radiation suppression ratio, and the line decoupling ratio.
The noise suppression sheet is used to reduce noise in a digital image. Following the provision of at least one luminance threshold value, at least one luminance characteristic value is determined based on the luminance value of a target pixel and the luminance values of adjacent pixels to the target pixel. Next, the noise suppression sheet compares the luminance feature value with the luminance threshold value to determine whether the target pixel is a noise point; finally, when the target pixel is a noise point, adjust the luminance value of the target pixel, the first color the noise suppression method of the present invention can not only find the noise in a digital image but also reduce the damage and interference caused by the noise itself to the image, thereby improving the picture quality of the image.
In recent years, various electronic devices represented by smartphones have been reduced in size and thickness, and various functions such as NFC and contactless power supply have also been developed. As a result, the high level of integration inside the device has been further developed, and an effective noise suppression sheet effect has been gradually required in terms of noise countermeasures. Noise suppression sheet countermeasures are implemented through circuit design on the substrate and various electronic components mounted thereon. In addition, it is necessary to suppress the radiation of unintended and unnecessary noise. Magnetic sheet for heat, thus preventing noise from leaking to the outside of the device and reflection inside the device affecting other components, etc.
In addition, in recent years, there has been an increase in the use of pens based on the principle of electromagnetic induction for input on smartphones and tablet terminals. In order to improve the sensitivity of electromagnetic pen input, a magnetic sheet is pasted on the sensor board of the display. In addition, the market demand for high-speed and high-precision pen input and thinning of the sensor board and the magnetic sheet is increasing, which requires a magnetic sheet with high magnetic permeability. In response to these requirements, TDK has implemented a thin magnetic sheet with a magnetic permeability of 220 (at 1MHz typ.) using its unique material technology.
For noise control, mainly from the following aspects:
- The energy of sound in the process of propagation attenuates with the increase of distance, therefore, the purpose of noise reduction can be achieved by staying away from the noise source.
- The radiation of sound is generally directional, and the received sound intensity is also different at the same distance from the sound source but in different directions. Most sound sources are frequency radiated noise with poor directivity, and the directivity increases as the frequency increases. Therefore, controlling the propagation direction of noise (including changing the emission direction of the sound source) is an effective measure to reduce noise, especially high-frequency noise.
- Establish sound insulation barriers or use natural barriers (soil slopes, hills, buildings, etc.) and other sound insulation materials and sound insulation structures to block the spread of noise.
- Apply sound-absorbing materials and sound-absorbing structures to convert the propagating noise into heat energy, etc.
The noise suppression sheet of the RFID radio frequency identification system is an electronic label packaged with a special anti-magnetic absorbing material.
The realization of the anti-metal principle mainly depends on the medium isolated from the metal, and the metal is used as a reflective surface to improve the characteristics of the label on the metal.
The anti-metal tag is an electronic tag encapsulated with a special anti-magnetic absorbing material, which technically solves the problem that the electronic tag cannot be attached to the metal surface. The product is waterproof, acid-proof, alkali-proof, and collision-proof and can be used outdoors; the anti-metal electronic label can be affixed to metal to obtain good reading performance, even farther than reading in the air, which can effectively prevent metal interference with radio frequency signals.
After the establishment of Shenzhen Penghui, it has continued to supply flexible absorbent materials for the IoT RFID industry. As a flexible absorbent materials supplier, Penghui helps many RFID companies to solve the problem of anti-metal interference of electronic tags, IC cards, card readers, antennas and other module devices. By the majority of enterprises praise. Please feel free to contact us if you are interested in our products.
