Thanks to their pyramid-shaped structure, pyramidal absorbers can maximize absorption efficiency by scattering microwaves in multiple directions. The following sections explore the unique characteristics, primary applications, and benefits of microwave absorbers with this specialized geometry.
This broadband microwave absorber, constructed from carbon-loaded pyramid-shaped urethane foam, is used on the walls, ceilings, and floors of anechoic chambers and shielded rooms to effectively absorb external microwaves and internal reflected waves. Primary applications include 5G/6G communication equipment, automotive radar, and satellite/defense sectors, making it ideal for constructing high-precision microwave measurement environments.
It exhibits high performance for both normal and off-normal incident angles, ensuring accurate measurements with minimal reflection. The urethane foam structure is lightweight and flexible, facilitating easy installation and simple attachment/removal using hook-and-loop fasteners.
The pyramidal shape forms a seamless absorption surface, preventing performance degradation in high-frequency ranges. It also complies with UL flame-retardant standards, ensuring it is a safe and durable absorption material.
| Manufacturer Name | Microwave Factory (E&C Engineering) |
|---|---|
| Frequency range | 200 MHz to 24 GHz |
| Absorption performance | 30 dB to 50 dB |
| Size | Approximately 61 cm × 61 cm, height 11 cm to 114 cm |
| Material | Polyurethane foam + conductive carbon |
Reference: Microwave Factory Official Website（https://ece.co.jp/products/absorber/vhp.html）
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Microwave Factory's
RF absorbers
This is a broadband RF absorber constructed with a specially processed, low-density polyurethane foam substrate. The sharp pyramidal shape creates an impedance gradient, enabling excellent microwave absorption performance for both normal and oblique incidence.
Primary applications include use as interior wall material for various RF anechoic chambers, where it is expected to improve measurement accuracy by reducing reflected waves. Furthermore, it enables the construction of more accurate testing environments by suppressing unwanted reflections in radar cross-section (RCS) measurement facilities and microwave test ranges.
Additionally, the absorber complies with flame-retardant standards, ensuring safety is carefully considered. Flexible installation options such as adhesives, hook-and-loop fasteners, and clip-and-rail systems allow for tailored solutions to meet specific on-site requirements.
| Manufacturer Name | PPG (Cuming Microwave) |
|---|---|
| Frequency range | Approximately 0.08 GHz to 50 GHz |
| Absorption performance | Up to 60 dB |
| Size | Approximately 60 cm × 60 cm, height approximately 7.6 cm to 244 cm |
| Material | Polyurethane foam |
Reference: [PDF]PPG (Cuming Microwave) Official Website（https://assets-us-01.kc-usercontent.com/2a927e0d-6649-001d-033d-d488bdff5f23/55f4b07e-d63f-48ad-85d4-afc5d8da1317/C-RAM-SFC_6-5-23.pdf）
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PPG (Cuming Microwave)'s
RF absorbers
This absorption material features a sharp pyramidal shape with a urethane foam substrate. It is designed to exhibit excellent absorption characteristics across a wide frequency range and effectively suppress microwave reflections.
The material is lightweight, flexible, and easy to handle, allowing for easy installation and replacement. Additionally, it is treated for flame retardancy, ensuring high levels of safety. Furthermore, it is characterized by stable performance over long-term use and excellent maintainability.
Primary applications include anechoic chambers, test boxes, and outdoor test ranges for sectors such as aerospace/defense, telecommunications, automotive, and research institutions to create accurate measurement environments by reducing reflected waves. In practical operation, it offers the advantage of significantly reducing unwanted reflections and noise, thereby enhancing measurement accuracy and data reliability.
| Manufacturer Name | Microwave Vision Group |
|---|---|
| Frequency range | 30 MHz to 40 GHz |
| Absorption performance | Up to 50dB |
| Size | 60.96 cm × 60.96 cm, height 10.2 cm to 243.8 cm |
| Material | Not specified |
Reference: Microwave Vision Group Official Website（https://www.mvg-world.com/media/2191/download/reference）
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Microwave Vision Group'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.