RFID absorber

RFID absorber is a magnetic functional material with high magnetic permeability. It is usually made by uniformly filling some absorbents on polymer materials and making them through special processes.


Cell phone payment (NFC) is realized by a 13.56MHz RFID radio frequency identification system. The RFID absorber smart tag for this application is the one that is attached to the back cover shell of the cell phone, which maximizes space saving. In handheld electronic devices such as cell phones, electronic tags to be integrated or affixed to the electronic device, as a component of the device to play a function, often due to space constraints, it is unavoidable to RFID tags (usually passive) affixed to the surface of conductive objects, such as metal or affixed to the proximity of the position of a metal device. Label in the reader issued by the signal effect of excitation induced by the alternating electromagnetic field is very easy to be metal eddy current attenuation effect and make the signal strength greatly weakened, failing the reading process. For them to products can be better applied to read the card, they need to increase the product of the wave-absorbing sheet. Shenzhen Penghui Functional Materials Co., Ltd. produces the NFS series of wave-absorbing sheets are designed for NFC payment when interference encountered when the material.
Shenzhen Penghui Functional Materials Co., Ltd. provides high-quality RFID absorber materials for design engineers and company purchasing and provides corresponding technical support services.
We provide products in the form of rolls or sheets (customer’s choice), at the same time, according to customer requirements for the desired shape of the product cut, the customer only needs to paste the RFID absorbing sheet can be.
Our company provides free samples for the majority of design engineers to try, if you find problems in the design process, our company will send a professional service team on-site service.
Welcome engineers to come to buyers to discuss.

Wave absorption principle of RFID absorber material

RFID absorber is a kind of magnetic functional material with high magnetic permeability, which is usually made by filling some absorbers uniformly on the polymer material through a special process. Compared with the traditional sense of wave-absorbing materials, this type of high-performance wave-absorbing materials for 13.56MHz is different in performance characterization and use principle.

For traditional RFID absorber materials, the main application object is in military confrontation, to cover, confuse the other side of the radar reconnaissance of some aircraft, warships, and armored tanks, with the use of high-frequency microwave segment, and the use of analysis is also a far-field model. Now with the continuous optimization of electronic products performance, can also be applied within the civilian electronic equipment, used to provide a path for the magnetic field of the magnetic conductor. Because of its flexibility and ease of installation, it is now favored by an increasing number of R&D engineers.

In RFID applications, the RFID absorber can be inserted between the 13.56MHz return antenna and the metal substrate to increase the induced magnetic field through the absorbing material itself and reduce the chance of passing through the metal plate, thus reducing the induced eddy currents generated in the metal plate and thus reducing the loss of induced magnetic field. At the same time, because of the insertion of the wave-absorbing piece, the measured parasitic capacitance will also be reduced, the frequency shift will be reduced, and the resonant frequency of the card reader will be consistent, to improve the reading distance, of course, the degree of improvement depends on the excellent degree of the wave-absorbing material characteristics.

In recent years, various new applications based on NFC/RFID technology have ushered in an unprecedented period of rapid growth, especially in the current exceptionally hot mobile payment market. The potential of the market is undoubtedly huge, but also because of the technology-driven progress of the NFC/RFID technology industry, it must be said that today’s NFC/RFID still has many insurmountable technical obstacles, which is also an important reason to prevent further expansion of the market.

Currently, the use of a material to solve the interference problem is magnetic materials. Generally speaking magnetic materials are divided into permanent magnetic materials (Hc>1000A/m) and soft magnetic materials (Hc<100A/m), and NFC/RFID design are used when the soft magnetic materials, which are wave-absorbing.

What is the specific role of the so-called RFID absorber material? NFC/RFID in the work of the antenna formation of the magnetic field is susceptible to metal and other items of interference, resulting in unnecessary errors in the identification of equipment, and the use of HFC absorber material can be very good to eliminate this error. For example, the NFC/RFID antenna is generally placed between the back cover of the phone and the battery, and the battery is prone to interference with the magnetic field, at this time we only need to put a layer of absorbing material between the antenna and the battery, it can eliminate the adverse effects of this interference.

RFID absorber material is a special material used to absorb electromagnetic waves of radio frequency. It can effectively reduce electromagnetic interference and reflections in RFID absorber systems, and improve the performance and stability of RFID systems. RFID absorber materials usually consist of one or more electromagnetic wave absorbers and a base material, where the electromagnetic wave absorber is the key to absorbing electromagnetic waves.

The advantages of RFID absorber materials are mainly in the following aspects:

  1. Improve RFID system performance: RFID wave-absorbing materials can effectively absorb electromagnetic waves and reduce electromagnetic interference and reflection, thereby improving the performance and stability of RFID systems.
  2. Reduce RFID system cost: Using RFID absorber materials can reduce the cost of the RFID system because it can reduce the number and complexity of other components in the RFID system.
  3. Improve RFID system security: RFID absorbing materials can reduce the electromagnetic radiation of the RFID system, thus protecting the RFID system and other devices from electromagnetic interference and damage, and improving the security of the RFID system.
  4. Adapt to a variety of RFID application environments: RFID absorbing materials can be customized for different RFID application environments and frequency ranges to meet different application needs and performance requirements.

In short, the use of RFID absorber materials can improve the performance and stability of RFID systems, reduce the cost of RFID systems, improve the security of RFID systems, and adapt to a variety of RFID application environments, with a wide range of application prospects.

Characteristics of RFID absorber

  1. Data storage: compared with the traditional form of labels, the capacity is larger (1bit- -1024bit), and the data can be updated at any time, read and written.
  2. Read and write speed: compared with bar code, does not need to line scanning, read and write rate is faster, can be multi-target recognition, motion recognition.
  3. Easy to use: small size, easy to package, can be embedded in the product.
  4. Security: dedicated chip, serial number, difficult to copy.
  5. Durable: no mechanical failure, long life, resistance to the harsh environment.
  6. Induction effect: much better than the average

The working principle of RFID absorber

The basic working principle of RFID absorber technology is not complicated: after the label enters the magnetic field, receives the RF signal from the reader, sends the product information of induced current stored in the chip (PassiveTag, passive label, or passive label), or actively send the signal of a certain frequency (ActiveTag, active label or active label); after the reader reads and decoding the information, send it to the central information system for relevant data processing.

The RFID (RFID) system consists of two parts: a read/write unit and an electronic transceiver. The reader emits electromagnetic pulses through the antenna, and the transceiver receives these pulses and sends the stored information to the reader in response. This is the contactless read, write, or delete process of memory data.

Technically, the “smart tag” contains RFID circuits that include an RFID chip with RFID RF sections and an ultrathin antenna loop embedded in the label along with a plastic sheet. Usually, a paper label is also attached to this label, on which some important information can be printed. Current smart tags are generally the size of credit cards, including 4.5×4.5cm tags for small goods, and 4.7 cm circular circles on CDs and DVDs.

Compared with other ID technologies such as bar codes or magnetic strips, the advantage of transceiver technology is the wireless link between the reader and the transceiver: the read/write unit does not require visual contact with the transceiver, so it can be fully integrated into the product. This means that transceivers are suitable for harsh environments, and are insensitive to damp, dirty, and mechanical effects. Therefore, the transceiver system has very high reading reliability and fast data acquisition, and finally, an important point is to save labor and paper.

Industry development of RFID absorber

The Internet of Things has been identified as one of the strategic emerging industries in China. The introduction of the “12th Five-Year Plan” for the development of the Internet of Things has undoubtedly given a strong wind to the development of the Internet of Things in China. RFID absorber technology is the most critical technology for the development of the Internet of Things, its application market will continue to expand with the development of the Internet of Things.

Radiofrequency identification RFID (Radio Frequency Identification) technology, also known as radio frequency identification, is a kind of radio signal identification of specific targets and reading and writing related data, without the need to establish mechanical or optical contact between the identification system and the target communication technology. At present, RFID technology is widely used, such as libraries, access control systems, food safety traceability, etc.

At present, Europe and the United States, and other developed countries are still in the leading position in terms of chips, terminal equipment, system applications, etc., especially in the standard-setting and core technology development has an absolute right to speak.

According to the Foresight Industry Research Institute released the “2014-2018 China RFID Industry Deep Research and Investment Strategic Planning Analysis Report”: the China RFID Industry Alliance, since 2018 China’s Internet of Things development was officially included in the national development strategy Since 2010, China’s RFID and Internet of Things industry has ushered in a rare opportunity for development. In 2012, China’s RFID market scale reached 23.66 billion yuan, an increase of 31.5%; in 2013, the industry scale exceeded 30 billion yuan, with a growth rate of 35%. The RFID industry has the development prospect of the sunrise industry.

Analysis that the Internet of Things has become one of the strategic high points of the world’s new round of economic and technological development, and the development of RFID technology as the core technology of the Internet of Things has undoubtedly played a vital role.

In recent years, under the guidance of central and local policies, the RFID absorber industry is developing well around the world, of which Shenzhen is particularly prominent: Faraway Valley, the first technology, national technology, Huawei, ZTE, and other successful implementation of the Guangzhou-Shenzhen Railway RFID tickets, Shenzhen Library RFID system, Shenzhen Customs RFID freight, Shenzhen Inspection and Quarantine Bureau RFID security supply chain, mobile payment RF-SIM card, and electronic license plate, etc.

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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