EMI Absorbing for abtenna mobile phone

By attached between the antenna and the back metal, forming a magnetic conduction channel, which can eliminate the interfere to antenna from metal (Or other sources of interference) , Enable the antenna to transmit a signal normally.


Penghui NFS120 series RF absorbing film

Penghui NFS120 series RF absorbing chip / RF magnetic diaphragm product as a mid-and high-end RF absorbing chip in Shenzhen Penghui. Its excellent performance makes it use more and more customers in the increasingly competitive market, despite its high price, but it can help customers solve their product problems faster and better, Its thinnest thickness of 0.05mm is also a major advantage of this product, and it is very soft, widely used in RFID anti-metal electronic tags, NFC antenna anti-interference, Flexible FPC anti-interference, and many other scenarios, Penghui NFS120 series products without glue thickness of 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.5mm, can help customers to solve the interference of the use environment (common interference source is metal, it can also be a PCB, components, etc.) and cause the product can not be used normally problems.

The RFID anti-metal electronic tag, also known as the high-frequency anti-metal tag, is an electronic tag made of the RF absorbing sheet with the anti-interference function, which effectively solves the problem of the metal carrier interfering with the RF signal of the electronic tag attached to its surface.

RFID anti-metal electronic label on the original label added a special anti-metal absorption chip, such as Penghui WLF15 series, NFS20 series, NFS40 series, NFS120 series, NFS150 series, prevent metal items to label signal interference, the label also has anti-corrosion, waterproof, acid prevention function, high temperature resistance, impact resistance, collision prevention, suitable for a variety of harsh use environment.

Absorbing material refers to a class of materials that can absorb the energy of electromagnetic waves projected on its surface. Applying this material to electronic equipment can absorb leaked electromagnetic radiation and achieve the purpose of eliminating electromagnetic interference. In engineering applications, in addition to requiring the absorbing material to have a high absorption rate of electromagnetic waves in a wide frequency band, it is also required to have light weight, temperature resistance, moisture resistance, corrosion resistance and other properties. For design engineers, the use of absorbing materials for EMI shielding is an effective way to reduce EMI. For different interference sources, choose the optimal absorbing material after considering the installation size and space position, so as to ensure that the system achieves the best shielding effect.


RFID anti-metal electronic tags with RF absorbing sheet have the following characteristics:

  1. RFID anti-metal electronic label users can customize their standard data to improve the efficiency of the application system;
  2. The RFID anti-metal electronic label is far to read away (its read and write distance is related to the RFID reader and the antenna);
  3. Super anti-interference ability;
  4. Data storage time is long, up to 20 years, cost-effective;
  5. Multi-label reading, not affected and limited by the number of labels in the workspace;
  6. RFID anti-metal electronic label adopts ultra-wide working band design, which not only complies with relevant industry regulations, but also can conduct flexible development and application;
  7. The storage area is used for users to encrypt the read, write, erase and rewrite operations, and can also specify the user-specific permanent private word area.


Penghui NFS120 series RF suction / RF diaphragm appearance structure

emi absorbing for abtenna mobile phone

emi absorbing for abtenna mobile phone


Penghui NFS120 series RF absorbing chip / RF diaphragm features

  1. Synthesis type made of high conductivity magnetic soft magnetic powder + environmental protection polymer material, the thinnest thickness can be 0.05mm thickness, with very good softness;
  2. With a very high magnetic permeability real part, in a wide frequency band can play a good magnetic conduction effect;
  3. The quality and stability of the wave-absorbing chip is very good, which can be used in-40℃ -120℃, with good environmental adaptability;
  4. The wave-absorbing chip has high inductance and high Q value. Combined with debugging can bring better identification distance to anti-metal products, and increase the competitiveness and attached value of anti-metal products;
  5. The thinnest bare material is 0.05mm, add glue to 0.08mm, it is very good in softness, can be very good flexible FPC label for use, a variety of thickness, for customers to choose freely;
  6. The surface of the absorbing sheet is smooth and delicate, not off powder, not rotten edge, not light, not volatile;
  7. Can improve RFID electronic labels, antenna, readers, IC card, bus card and other radio frequency electronic products in reading and writing failure when encountering metal, play a role of anti-metal interference;
  8. High price, excellent performance, suitable for high performance requirements, not particularly sensitive products to use;
  9. Through ROHS, HF, REACH certification, with aging resistance characteristics.


So what is the role of absorbing materials in RFID anti-metal electronic tags?

In the RFID frequency range, when the electromagnetic wave encounters the metal surface, due to the eddy current phenomenon, a strong electromagnetic wave reflection is generated, and there is a phase difference between the reflected electromagnetic wave and the incident wave, which causes mutual cancellation. At this time, the really effective electromagnetic field is rapidly reduced. Small, because the lower the resistivity of the metal material, the greater the eddy current loss will be, and the more serious the metal problem will be. Therefore, when the antenna is subjected to extreme metal interference, the instructions issued by the card reader will disappear completely, so the data reading result will fail.

The absorbing material mainly uses the characteristics of high magnetic permeability. When in use, insert the absorbing sheet between the loop antenna of the RFID anti-metal tag and the metal substrate to increase the induced magnetic field and reduce the probability of passing through the metal plate through the absorbing material itself, so as to reduce the generation of induced eddy currents in the metal plate, and the absorbing material to reduce the loss of the induced magnetic field. At the same time, due to the insertion of the magnetic isolation sheet of the absorbing material, the measured parasitic capacitance will also be reduced, and the frequency offset will be reduced. The resonance frequency of the card holder is consistent, which greatly improves the card reading effect and distance. Shenzhen PH Functional Materials specializes in the production of RFID anti-metal electronic tags. We are an experienced RFID anti-metal electronic tag factory. If you need such products, please feel free to contact us.


What is RFID anti-metal electronic tag?

With the development of science and technology, the current RFID technology has become more and more mature and has been widely used in all walks of life. In most application scenarios, the RFID anti-metal electronic tag will be attached to the surface of the metal object, and the metal object itself will affect the working performance of the RFID anti-metal electronic tag, and the electromagnetic waves emitted by the RFID anti-metal electronic tag will be isolated by the metal. , the signal is interfered, resulting in the performance of the tag degraded, and even cannot be effectively read by the corresponding equipment. In order to solve this problem, RFID anti-metal electronic tags came into being.

RFID anti-metal electronic tag is a layer of anti-metal material added to the original RFID electronic tag. This layer of material can avoid the occurrence of failure after the tag is attached to a metal object. The anti-metal material is a special anti-magnetic material. The electronic tag encapsulated by the absorbing material 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 early RFID anti-metal electronic tags were large in size, and were often subject to many restrictions in practical applications. In recent years, with the rapid development of intelligent manufacturing and smart medical fields, the market demand for RFID anti-metal electronic tags has gradually increased. High-performance, miniaturized RFID anti-metal electronic tags are more and more popular. In order to adapt to different application scenarios and requirements, the changes in the form of RFID anti-metal electronic tags are quite rich. Nowadays, the main types of RFID anti-metal electronic tags are: PCB type, ABS type, ceramic type, flexible anti-metal electronic label Labels, etc., and can be made into various styles and shapes, such as bars, squares, circles, etc.


Penghui NFS120 series RF absorbing chip / RF diaphragm specifications

emi absorbing for abtenna mobile phone


  1. The product is kept at room temperature to avoid direct sunlight and high temperature and high humidity;
  2. The above data are averaged from the multiple actual tests of the company, and the company has the right to make the final interpretation;
  3. The buyer must determine whether the product is suitable for a specific use and whether it is suitable for the buyer’s application mode. Many factors will affect the performance of the product for a specific use. If you have any questions about the company’s products, please contact the company personnel, so that we can better serve you.

About Company

PH mainly produces absorbing sheet, EMI suppression sheet, sintered ferrite sheet, electromagnetic shielding coating and other electromagnetic functional materials. It is the first national high-tech enterprise in China that focuses on the R&D, production and sales of sheet absorbing materials and electromagnetic shielding coatings. The products are sold to all over the world and are well received by the industry.

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