rf Pyramidal foam absorber for anechoic chamber
Pyramidal Foam absorber can be utilised for the frequency range 100MHz to 40GHz. The factor determining the lowest useable frequency is the physical size of the foam pyramid. The larger the dimensions of the pyramid, the lower the frequency of operation. Due to the volume consumed within an anechoic enclosure when using large pyramidal foam. Ferrite Tiles are often overlaid with smaller Pyramidal Foam absorber to extend the anechoic performance down to 30MHz without losing valuable space. Polyurethane foam loaded with carbon (and fire retardant) can be supplied in various dimensions.
RF Foam Absorber Types
· Rubber sheet micromave absorber
· Carbon-based foam microwave absorber
· Honeycomb & high power microwave absorber
· Sprayable microwave absorber
· Rigid and castable microwave absorber
| TYPE | BASE SIZE | NUMBER OF PYRAMIDAL | WEIGHT | TOTAL HEIGHT | BASE HEIGHT | PYRAMIDAL HEIGHT |
PYRAMIDAL WIDTH |
| HZ-30 | 500*500 | 36*36 | 1.1 | 30 | 15 | 15 | 14 |
| HZ-50 | 500*500 | 20*20 | 1.8 | 50 | 20 | 30 | 25 |
| HZ-70 | 500*500 | 20*20 | 2.5 | 70 | 20 | 50 | 25 |
| HZ-100 | 500*500 | 13*13 | 3.3 | 100 | 25 | 75 | 38 |
| HZ-150 | 500*500 | 9*9 | 4.8 | 150 | 30 | 120 | 56 |
| HZ-200 | 500*500 | 7*7 | 6.3 | 200 | 40 | 160 | 71 |
| HZ-300 | 500*500 | 5*5 | 9 | 300 | 60 | 240 | 100 |
| HZ-400 | 500*500 | 4*4 | 12 | 400 | 70 | 330 | 125 |
| HZ-500 | 500*500 | 3*3 | 15 | 500 | 80 | 420 | 167 |
| HZ-600 | 400*400 | 2*2 | 18 | 600 | 90 | 510 | 200 |
| HZ-700 | 250*500 | 1*2 | 21 | 700 | 100 | 600 | 250 |
| HZ-800 | 250*500 | 1*2 | 24 | 800 | 100 | 700 | 250 |
| HZ-1000 | 334*334 | 1*1 | 30 | 1000 | 150 | 850 | 3 |
| TYPE | HEIGHT | REFLECTIVITY | ||||||||
| 40 | 15 | 10 | 3 | 1.5 | 0.5 | 0.3 | 0.2 | 0.15 | ||
| HZ-100 | 100 | 50 | 45 | 40 | 30 | 20 | ||||
| HZ-150 | 150 | 50 | 50 | 45 | 33 | 25 | ||||
| HZ-200 | 200 | 50 | 50 | 50 | 37 | 30 | 17 | |||
| HZ-300 | 300 | 50 | 50 | 50 | 40 | 33 | 20 | |||
| HZ-400 | 400 | 50 | 50 | 50 | 45 | 40 | 25 | 17 | ||
| HZ-500 | 500 | 50 | 50 | 50 | 45 | 40 | 30 | 20 | 17 | |
| HZ-600 | 600 | 50 | 50 | 50 | 50 | 40 | 30 | 25 | 20 | |
| HZ-700 | 700 | 50 | 50 | 50 | 50 | 43 | 35 | 30 | 20 | 17 |
| HZ-800 | 800 | 50 | 50 | 50 | 50 | 45 | 36 | 30 | 20 | 17 |
| HZ-1000 | 1000 | 50 | 50 | 50 | 50 | 45 | 38 | 35 | 25 | 20 |
RF Foam Absorber Basic Information
· Base size: 500*500mm, customized acceptable
· Standard height: 30,50,100,150,200,300,400,500,700,800,1000mm
RF Foam Absorber Features
· The traditional material for anechoic chambers
· Outstanding absorbing over a wide frequency range
· Flexible
About US
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Before-sale:
1.All inquires will be replied with 8 hours. 7D/24H service,Please feel free to contact us with Email/TM/Skype.
2.Strong technical team and Professional sales.
3.Customized packaging is acceptable.
4.Welcom customers from all the world to visit our factory.
After-sale:
1.All emi filter will be tested and adjusted before shipping.
2.After receiving the products,Any question we will try our best to solve. 
Broadband Absorption with Lightweight Design
The pyramid foam absorber is engineered for EMI test chambers, delivering strong absorption across the 100 MHz–40 GHz range. Its tapered geometry traps and dissipates RF energy, aligning with emi filter circuit strategies while allowing attachment of low pass filter, lowpass filter, and ac filter modules at chamber entry points. This design clarifies what is a low pass filter within anechoic setups, providing educational value and practical shielding.
Custom Sizes and Material Grades
Haozhuo produces absorber panels in heights of 30, 50, 100, 150, 200, 300, 400, 500, 700, 800, and 1000 mm, with base size 500×500 mm or customer-defined dimensions. Each panel supports emi filter, low pass rc filter, and rfi filter module integration in layered configurations without touching chamber walls, which preserves emi filter purpose and minimizes reflections.
Fire-Rated PU Foam with Structural Stability
Made from fire-retardant polyurethane foam loaded with carbon and iron, the absorber meets flame‑retardant standards while maintaining consistent RF attenuation. It integrates with emi filter, low pass filter, and emi filter circuit systems and sustains dimensional stability up to 120 °C. The honeycomb reflection structure aligns with what is low pass filter and what is a low pass filter implementation for EMC integrity.
Lab-Tested Performance & Quality Assurance
Each batch undergoes internal RF testing using free-space and cavity-resonance methods, confirming insertion loss and reflectivity metrics. The panels are fully documented for emi filter purpose, with declared performance across wide frequency bands and distribution-ready certification, ensuring readiness for telecom, automotive, and military applications requiring low pass filter compliance.
Product Advantages
1. Broadband RF Attenuation
Designed to suppress EMI from 100 MHz to 40 GHz, these pyramid panels support low pass filter, emi filter, and rfi filter configurations to ensure clean RF environments and define what is low pass filter in use.
2. Flexible & Modular Sizing
Available in multiple heights and configurable base sizes, the panels accommodate emi filter circuit, lowpass filter, and low pass rc filter additions without resizing chamber walls, supporting horizontal and vertical layouts.
3. High Temperature and Fire Resistance
Constructed from carbon-loaded PU foam with flame retardancy and stable performance up to 120 °C, and fully compatible with ac filter, emi filter circuit, and emi filter purpose strategies for safe operation in industrial and lab settings.
4. Space-Efficient Performance
By interleaving absorber with emi filter, low pass filter, and rfi filter mounting options, the design reduces chamber footprint while maintaining RF absorption, delivering efficiency and shielding effectiveness.
5. Quality Inspected & Documented
Each foam panel is measured for reflectivity and insertion loss across the frequency range and comes with datasheets explaining what is a low pass filter and system integration standards, ensuring traceability for engineering teams.
Optimize your anechoic chamber performance with Haozhuo’s broadband RF pyramid absorber foam—engineered for integration with emi filter circuit, low pass filter, and rfi filter systems. Contact us now for custom sizing, datasheets, and volume pricing.
About Us
Precision-Crafted EMC Solutions Backed by Decades of Engineering
Founded in 2003, Haozhuo is a global manufacturer of EMI filters and shielding products tailored to stringent IEC and military standards. Our expertise spans across industrial automation, medical equipment, new energy, rail transit, and defense sectors. With facilities certified to ISO 9001/14001/18001 and CE/UL/VDE compliance, every product reflects deep technical rigor and industry relevance.
End-to-End Manufacturing Control with Lab-Verified Performance
Each EMI filter and shielding solution is engineered in-house with advanced lab tools, including spectrum analyzers, LCR bridges, pulse generators, and shielded test rooms. We rigorously validate every design through simulation and physical testing against CISPR, EN, and GJB metrics. This enables us to offer rapid prototyping, stable mass production, and a standard two-year product warranty.
Scalable Production with Global Reach and Certified Quality
Operating from Changzhou with over 50 staff and an annual export volume exceeding 90%, our production integrates ERP and MES systems for traceability and efficiency. With sales in Europe, Korea, and over 100 countries, we deliver trusted EMC products to high-stakes industries. Milestones include ISO certification (2004), CE/RoHS (2007), and High-Tech Enterprise recognition.
Sustainability and Service in Every Shipment
Haozhuo incorporates ISO 14001 environmental protocols and material efficiency measures throughout design and production. We provide fast shipping via DHL, FedEx, and UPS, local service hubs in Germany, Italy, and Korea, and personalized technical support to ensure compliance, continuity, and cost-efficiency for your global projects.
FAQ
1. Who are we?
We are Changzhou Haozhuo Electronic Co., Ltd., a manufacturer specializing in EMI filters and electromagnetic shielding products since 2003. With ISO 9001/14001/18001 certifications and CE/UL/VDE compliant solutions, we serve over 100 international clients across industries like industrial automation, medical devices, energy systems, and rail transit.
2. How can we guarantee quality?
Quality is assured through in-house EMC testing facilities equipped with advanced analyzers, LCR bridges, and shielded chambers, alongside rigorous procedures that meet IEC, EN, and GJB standards. Our products undergo full inspection before delivery and include a standard two-year warranty for long-term reliability.
3. What can you buy from us?
We offer a wide range of EMI power-line filters, signal-line filters, feedthrough components, passive harmonic filters, RF shielding gaskets, copper foils, wave absorbers, and integrated solutions such as Faraday cages and MRI shielding rooms—all customizable to your exact technical and environmental needs.
4. Why should you buy from us not from other suppliers?
Our competitive edge lies in our end-to-end design, lab validation, and ISO-certified production system that ensures product performance and fast compliance with global standards. With local service in Germany, Italy, and Korea, plus fast international logistics and responsive engineering support, we minimize your procurement risks and lead time.
5. What services can we provide?
We provide one-stop EMC solutions including customized product design, in-house emission and insertion-loss testing, OEM labeling, international shipping with full tracking, technical consultation, and ongoing after-sales service—all optimized to support global clients with complex EMC requirements.
