Since the RF absorber sheet is a thin, sheet-type microwave absorber, it can be easily installed on equipment surfaces or in narrow spaces. They are ideal for reducing localized reflections and mitigating radio interference. The following sections introduce the primary applications of shape-specific microwave absorbers, as well as the benefits of their actual use.
This sheet-type microwave absorber was developed with a primary focus on the frequencies used in automotive collision-avoidance radar. At 76.5 GHz, it has a reflection coefficient of 10 dB or higher. Using a silicone resin substrate, it also features superior weatherability and thermal shock resistance.
Capable of operating within a temperature range of −54°C to +160°C, it is designed to withstand the stringent environmental conditions typical of automotive applications. The integrated metal layer on the reverse side ensures high performance even when the sheet is mounted on dielectric materials like plastic.
The reverse side features an aluminum-deposited polyester film, which allows for easy bonding to standard rubber-based adhesives. Furthermore, it can be easily cut with scissors or a utility knife, making it easy to adhere to curved surfaces.
| Manufacturer Name | Microwave Factory |
|---|---|
| Frequency range | 76.5 GHz |
| Absorption performance | 10 dB or higher |
| Size | Standard 30.5 cm × 30.5 cm × 0.12 cm |
| Material | Silicone resin |
Reference: Microwave Factory Official Website（https://ece.co.jp/products/absorber/sf765mb.html）
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Microwave Factory's
RF absorbers
These covers are constructed from a variety of elastomers, offering a choice of materials—such as nitrile, neoprene, natural rubber, urethane, silicone, fluorosilicone, and fluoroelastomer (Viton®)—to suit specific outdoor environments and applications.
While fluorosilicone and fluoroelastomer provide exceptional fuel, chemical, and high-temperature resistance, urethane and nitrile combine excellent fuel resistance with superior toughness and abrasion resistance.
The selection of the base elastomer enables the customization of electrical properties to meet the specific requirements of each application. The design can be further optimized for the attenuation of single or multiple frequencies, targeting both specular and surface waves. This versatility enables use in demanding sectors, including naval environments, high-speed aerospace, and defense applications.
| Manufacturer Name | Laird Technologies |
|---|---|
| Frequency range | Not specified on the official website |
| Absorption performance | Not specified on the official website |
| Size | Not specified on the official website |
| Material | Elastomer |
Reference: Laird Technologies Official Website（https://www.laird.com/products/microwave-absorbers/ruggedized-specialty-microwave-and-custom-magnetic-absorbers/custom-molded-elastomeric-covers）
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Laird Technologies'
RF absorbers
Images of this product were not provided on the official website.
This broadband, magnetic-filled flexible sheet absorbs incident RF energy by an average of 10 dB across a frequency range from 2 GHz to 12 GHz, while maintaining high performance over a wide range of incident angles. While silicone is the standard substrate, urethane options are also available.
To ensure performance, the sheet must be in close contact with the metal surface and can be bonded to the substrate using a silicone-based RTV adhesive.
Primary applications include reducing side lobes through antenna shroud lining, lowering free-space reflectivity, and reducing radar cross-section (RCS) or backscatter. Moreover, this flexible, broadband magnetic microwave absorber can be custom-sized and shaped.
| Manufacturer Name | PPG (Cuming Microwave) |
|---|---|
| Frequency range | 2 GHz to 12 GHz |
| Absorption performance | Average 10 dB |
| Size | 30.5 cm × 30.5 cm, thickness 3.2 mm |
| Material | Silicone |
Reference: PPG (Cuming Microwave) Official Website（https://max.ppg.com/adaptivemedia/rendition）
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PPG (Cuming Microwave)'s
RF absorbers
The RF absorber market is expanding rapidly, driven by the increasing need for EMI (Electromagnetic Interference) reduction in 5G/6G, autonomous driving, and defense applications.
This site provides comparative information on products and manufacturers by application to help you identify the ideal solutions for R&D, anechoic chambers, and high-frequency testing.
| Frequency Range |
|---|
| 3GHz-320GHz |
| Material |
| Urethane Foam |
| Key Features |
| Up to 50 dB of absorption |
At just 550g per panel—approximately half the weight of competing products (*1)—this polyurethane foam absorber covers a wide frequency range from 3 to 320 GHz.
Delivers 50 dB absorption, outperforming conventional heavy ferrites.
Velcro-backed for rapid mounting, ideal for temporary setups and cost-effective maintenance.
| Frequency Range |
|---|
| 20MHz-3GHz |
| Material |
| Elastomer |
| Key Features |
| Permeability (at 1 MHz): 150 |
Heat-resistant elastomer: Designed for direct SMT processing and high-temperature durability.
Ultra-thin (from 0.1 mm) for high-density integration with robust EMI suppression.
It significantly reduces assembly workload and enables EMI countermeasures without altering the existing manufacturing process.
| Frequency Range |
|---|
| 1-35 GHz |
| Material |
| Elastomer |
| Key Features |
| Reflection Performance: –20 dB |
Frequency-tuned for specific radar absorption, offering superior stealth performance over standard RF sheets (*2).
Millimeter-thin design delivers –20 dB reflection, ensuring high absorption while preserving aerodynamic integrity.
Excellent conformance to complex geometries with thermal stability from –60°C to 150°C—ideal for aerospace platforms.