Absorber sheet

An absorber sheet is a material that can absorb electromagnetic waves. An absorber sheet usually consists of one or more kinds of electromagnetic wave absorbers and a base material, where the electromagnetic wave absorber is the key to absorbing electromagnetic waves.


The absorber sheet material is a class of materials that can absorb or significantly reduce the energy of electromagnetic waves received on its surface, thereby reducing the interference of electromagnetic waves.

In engineering applications, in addition to the absorber sheet material in a wide band of electromagnetic waves have a high absorption rate, but also requires it to have a light mass, temperature, humidity, corrosion resistance, and other properties.

There are many kinds of absorbing materials, such as carbon-absorbing materials, iron-absorbing materials, ceramic-absorbing materials, etc. They are widely used in antennas, communication base stations, cell phones, and other communication products; laptops, oscilloscopes, car radar, and other electronic equipment, to absorb electromagnetic waves, reduce electromagnetic radiation, to avoid electromagnetic interference of electronic components.

An absorber sheet is a material that can absorb electromagnetic waves. An absorber sheet usually consists of one or more kinds of electromagnetic wave absorbers and a base material, where the electromagnetic wave absorber is the key to absorbing electromagnetic waves.

The absorber sheet material is widely used in electromagnetic compatibility (EMC) design, wireless communication, radar, satellite communication, military, and aerospace. Absorbers can eliminate electromagnetic interference and reflection, reduce electromagnetic radiation, and protect circuits and other equipment from electromagnetic interference and damage. In addition, wave absorbers can be used to isolate electromagnetic fields, prevent leakage and interference of electromagnetic waves, and protect the surrounding environment and other equipment.

Common absorber sheet materials include soft magnetic materials, nano-absorbing materials, porous absorbing materials, etc. Soft magnetic material is a material with high permeability and low hysteresis loss, which can absorb electromagnetic waves in the high-frequency range. Nano-absorbing material is a micron-level absorbing material with a high specific surface area and excellent wave absorption performance. Porous wave-absorbing materials, on the other hand, achieve the regulation of wave-absorbing performance by controlling the pore structure and morphology of the material.

The principle of absorber sheet material

  1. The absorber sheet material principle is to magnetic microwave absorber as the main body, the electromagnetic waves of electronic equipment to insulation loss, magnetic loss, and resistance loss, and other ways to convert into heat to reduce the role of electromagnetic radiation, with high permeability, selectable frequency band wide and other characteristics, and can be developed for specific frequency band orientation.
  2. Wave-absorbing materials in the range of 10MHz ~ 6GHz have good absorption characteristics and can avoid electromagnetic interference or leakage caused by secondary reflection. The products are mainly wave-absorbing patch types, but can also be processed into various shapes according to customer requirements. Wave-absorbing materials can be used in the cavity of electronic equipment such as notebook computers, cell phones, communication cabinets, etc.
  3. Wave-absorbing materials for electromagnetic wave absorption effect are good, absorption frequency is wide, according to customer requirements for frequency band customization products, thin thickness cost-effective, and wide range of uses and applications.

The application of absorber sheet material

  1. It can be used in the cavity of electronic equipment such as notebook computers, mobile phones, and communication cabinets.
  2. It can reduce the radiation and noise of various electronic equipment.
  3. It can reduce the coupling conduction radiation interference between low frequencies and reduce the low-frequency echo interference
  4. It can reduce the internal EMI (resonance, crosstalk) in the barrier frame.
  5. Apply between the chip and the cooling module.
  6. The application of EMI/RFI: EMI (Electro Magnetic Interference): direct translation is electromagnetic interference. Electromagnetic interference has three elements: the source of interference, interference propagation path, and sensitive equipment. The source of interference is the generation of electromagnetic interference of electronic equipment or systems, interference propagation paths including cables, space, etc., sensitive equipment is susceptible to electromagnetic interference of electronic equipment or systems. Transmitted frequency interference (RF Interference): RF is a high-frequency alternating current, which is commonly referred to as electromagnetic waves. RF interference is the interference caused by electromagnetic waves. If the two frequencies are similar electromagnetic waves will be received by the receiver at the same time causing interference. There will be harmonic interference in close proximity to the sending station. Interference with other receiving equipment. Electromagnetic waves at the same frequency can interfere with the radio.

Types of Absorbing Sheets

Absorbing sheets come in various types, depending on the material used in their production. The most common types of absorber sheets are silica gel, molecular sieve, activated carbon, and clay. Silica gel is the most popular and widely used absorber sheet due to its high moisture absorption capacity, low cost, and availability. A molecular sieve is another type of absorber sheet that is commonly used in the pharmaceutical industry. It has a high selectivity for water molecules and can effectively remove moisture from the air. Activated carbon absorber sheets are useful in removing odors and other volatile organic compounds. Clay absorber sheets are made up of natural clay materials and are often used in the food industry to prevent spoilage.

How to Choose the Right Absorber Sheet for Your Product

Choosing the right absorbing sheet for your product depends on several factors such as the type of product, packaging material, and expected storage conditions. Silica gel is a versatile absorber sheet that can be used in most applications. A molecular sieve is suitable for products that are sensitive to moisture and require a low-humidity environment. Activated carbon absorber sheets are useful for products that require odor control. Clay absorber sheets are suitable for food products that require moisture control.

How to Use Absorber Sheets

Using absorbing sheets is simple and straightforward. The absorber sheet should be placed inside the container or packaging, and the packaging should be sealed to prevent moisture from entering. The number of absorber sheets required depends on the size of the container, the type of product, and the expected humidity levels. It is essential to follow the manufacturer’s instructions regarding the number of absorber sheets required for each container or packaging.

Absorbing Sheets vs. Other Moisture Control Methods

Absorber sheets are not the only moisture control method available. Other methods include desiccants, humidity indicator cards, and dehumidifiers. Desiccants are similar to absorber sheets and are used to remove moisture from the air. Humidity indicator cards are used to monitor the humidity levels inside a container or packaging. Dehumidifiers are used to remove moisture from the air in a room or storage area. Each method has its advantages and disadvantages, and the choice depends on the specific application.

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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